据悉Dapper一遍封装了贰个易用的O奥迪Q3M工具类:SqlDapperUtil,把普通能用到的种种CRUD都实行了简化封装,让普通程序员只需关怀工作即可,因为相当不难,故直接贴源代码,大家若需使用能够平素复制到项目中,该SqlDapperUtil已广泛用于公司项目中。

后天成熟的OLANDM如拾草芥,那里只介绍Dapper的利用(最起码作者在接纳它,已经使用到品种中,小伙伴们举报仍可以够)。

   
方今趁着不忙,在思索三个搭建1个开源的全体项目,至于原因以及全数项目框架后面作品作者再作证。既然要起两个完好无缺的花色,那么数量存款和储蓄访问就少不了,那篇文章笔者首要介绍这几个新项目(OSS.Core)中本身对仓储层的不难思维和兑现进度(当前项目还地处搭建阶段),主要集中在以下多少个方面:

   
近期趁着不忙,在斟酌1个搭建3个开源的欧洲经济共同体项目,至于原因以及任何项目框架前边小说小编再作证。既然要起贰个完整的项目,那么数量存款和储蓄访问就少不了,那篇小说小编第③介绍那个新项目(OSS.Core)中本身对仓库储存层的简要思维和兑现进程(当前项目还处于搭建阶段),首要集中在以下多少个方面:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Dapper;
using System.Data;
using System.Data.Common;
using System.Reflection;
using System.IO;
using System.Collections.Concurrent;
using System.Data.SqlClient;

namespace Zuowj.Common
{
    /// <summary>
    /// 基于Dapper的数据操作类封装的工具类
    /// Author:左文俊
    /// Date:2017/12/11
    /// </summary>
    public class SqlDapperUtil
    {
        private static string dbConnectionStringConfigPath = null;
        private readonly static ConcurrentDictionary<string, bool> dbConnNamesCacheDic = new ConcurrentDictionary<string, bool>();

        private string dbConnectionName = null;
        private string dbConnectionString = null;
        private string dbProviderName = null;
        private IDbConnection dbConnection = null;
        private bool useDbTransaction = false;
        private IDbTransaction dbTransaction = null;


        #region 私有方法

        private IDbConnection GetDbConnection()
        {
            bool needCreateNew = false;
            if (dbConnection == null || string.IsNullOrWhiteSpace(dbConnection.ConnectionString))
            {
                needCreateNew = true;
            }
            else if (!MemoryCacheUtil.Contains(dbConnectionName))
            {
                needCreateNew = true;
            }

            if (needCreateNew)
            {
                dbConnectionString = GetDbConnectionString(dbConnectionName, out dbProviderName);
                var dbProviderFactory = DbProviderFactories.GetFactory(dbProviderName);
                dbConnection = dbProviderFactory.CreateConnection();
                dbConnection.ConnectionString = dbConnectionString;
            }

            if (dbConnection.State == ConnectionState.Closed)
            {
                dbConnection.Open();
            }

            return dbConnection;
        }

        private string GetDbConnectionString(string dbConnName, out string dbProviderName)
        {
            //如果指定的连接字符串配置文件路径,则创建缓存依赖,一旦配置文件更改就失效,再重新读取
            string[] connInfos = MemoryCacheUtil.GetOrAddCacheItem(dbConnName, () =>
            {
                var connStrSettings = ConfigUtil.GetConnectionStringForConfigPath(dbConnName, SqlDapperUtil.DbConnectionStringConfigPath);
                string dbProdName = connStrSettings.ProviderName;
                string dbConnStr = connStrSettings.ConnectionString;
                //LogUtil.Info(string.Format("SqlDapperUtil.GetDbConnectionString>读取连接字符串配置节点[{0}]:{1},ProviderName:{2}", dbConnName, dbConnStr, dbProdName), "SqlDapperUtil.GetDbConnectionString");
                return new[] { EncryptUtil.Decrypt(dbConnStr), dbProdName };
            }, SqlDapperUtil.DbConnectionStringConfigPath);

            dbProviderName = connInfos[1];
            return connInfos[0];
        }


        private T UseDbConnection<T>(Func<IDbConnection, T> queryOrExecSqlFunc)
        {
            IDbConnection dbConn = null;

            try
            {
                Type modelType = typeof(T);
                var typeMap = Dapper.SqlMapper.GetTypeMap(modelType);
                if (typeMap == null || !(typeMap is ColumnAttributeTypeMapper<T>))
                {
                    Dapper.SqlMapper.SetTypeMap(modelType, new ColumnAttributeTypeMapper<T>());
                }

                dbConn = GetDbConnection();
                if (useDbTransaction && dbTransaction == null)
                {
                    dbTransaction = GetDbTransaction();
                }

                return queryOrExecSqlFunc(dbConn);
            }
            catch
            {
                throw;
            }
            finally
            {
                if (dbTransaction == null && dbConn != null)
                {
                    CloseDbConnection(dbConn);
                }
            }
        }

        private void CloseDbConnection(IDbConnection dbConn, bool disposed = false)
        {
            if (dbConn != null)
            {
                if (disposed && dbTransaction != null)
                {
                    dbTransaction.Rollback();
                    dbTransaction.Dispose();
                    dbTransaction = null;
                }

                if (dbConn.State != ConnectionState.Closed)
                {
                    dbConn.Close();
                }
                dbConn.Dispose();
                dbConn = null;
            }
        }

        /// <summary>
        /// 获取一个事务对象(如果需要确保多条执行语句的一致性,必需使用事务)
        /// </summary>
        /// <param name="il"></param>
        /// <returns></returns>
        private IDbTransaction GetDbTransaction(IsolationLevel il = IsolationLevel.Unspecified)
        {
            return GetDbConnection().BeginTransaction(il);
        }

        private DynamicParameters ToDynamicParameters(Dictionary<string, object> paramDic)
        {
            return new DynamicParameters(paramDic);
        }

        #endregion

        public static string DbConnectionStringConfigPath
        {
            get
            {
                if (string.IsNullOrEmpty(dbConnectionStringConfigPath))//如果没有指定配置文件,则取默认的配置文件路径作为缓存依赖路径
                {
                    dbConnectionStringConfigPath = BaseUtil.GetConfigPath();
                }

                return dbConnectionStringConfigPath;
            }
            set
            {
                if (!string.IsNullOrWhiteSpace(value) && !File.Exists(value))
                {
                    throw new FileNotFoundException("指定的DB连接字符串配置文件不存在:" + value);
                }

                //如果配置文件改变,则可能导致连接字符串改变,故必需清除所有连接字符串的缓存以便后续重新加载字符串
                if (!string.Equals(dbConnectionStringConfigPath, value, StringComparison.OrdinalIgnoreCase))
                {
                    foreach (var item in dbConnNamesCacheDic)
                    {
                        MemoryCacheUtil.RemoveCacheItem(item.Key);
                    }
                }

                dbConnectionStringConfigPath = value;
            }
        }

        public SqlDapperUtil(string connName)
        {
            dbConnectionName = connName;
            if (!dbConnNamesCacheDic.ContainsKey(connName)) //如果静态缓存中没有,则加入到静态缓存中
            {
                dbConnNamesCacheDic[connName] = true;
            }

        }


        /// <summary>
        /// 使用事务
        /// </summary>
        public void UseDbTransaction()
        {
            useDbTransaction = true;
        }


        /// <summary>
        /// 获取一个值,param可以是SQL参数也可以是匿名对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <param name="transaction"></param>
        /// <param name="commandTimeout"></param>
        /// <param name="commandType"></param>
        /// <returns></returns>
        public T GetValue<T>(string sql, object param = null, int? commandTimeout = null, CommandType? commandType = null)
        {
            return UseDbConnection((dbConn) =>
             {
                 return dbConn.ExecuteScalar<T>(sql, param, dbTransaction, commandTimeout, commandType);
             });
        }

        /// <summary>
        /// 获取第一行的所有值,param可以是SQL参数也可以是匿名对象
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <param name="transaction"></param>
        /// <param name="commandTimeout"></param>
        /// <param name="commandType"></param>
        /// <returns></returns>
        public Dictionary<string, dynamic> GetFirstValues(string sql, object param = null, int? commandTimeout = null, CommandType? commandType = null)
        {
            return UseDbConnection((dbConn) =>
            {
                Dictionary<string, dynamic> firstValues = new Dictionary<string, dynamic>();
                List<string> indexColNameMappings = new List<string>();
                int rowIndex = 0;
                using (var reader = dbConn.ExecuteReader(sql, param, dbTransaction, commandTimeout, commandType))
                {
                    while (reader.Read())
                    {
                        if ((++rowIndex) > 1) break;
                        if (indexColNameMappings.Count == 0)
                        {
                            for (int i = 0; i < reader.FieldCount; i++)
                            {
                                indexColNameMappings.Add(reader.GetName(i));
                            }
                        }

                        for (int i = 0; i < reader.FieldCount; i++)
                        {
                            firstValues[indexColNameMappings[i]] = reader.GetValue(i);
                        }
                    }
                    reader.Close();
                }

                return firstValues;

            });
        }

        /// <summary>
        /// 获取一个数据模型实体类,param可以是SQL参数也可以是匿名对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <param name="transaction"></param>
        /// <param name="commandTimeout"></param>
        /// <param name="commandType"></param>
        /// <returns></returns>
        public T GetModel<T>(string sql, object param = null, int? commandTimeout = null, CommandType? commandType = null) where T : class
        {
            return UseDbConnection((dbConn) =>
            {
                return dbConn.QueryFirstOrDefault<T>(sql, param, dbTransaction, commandTimeout, commandType);
            });
        }

        /// <summary>
        /// 获取符合条件的所有数据模型实体类列表,param可以是SQL参数也可以是匿名对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <param name="transaction"></param>
        /// <param name="buffered"></param>
        /// <param name="commandTimeout"></param>
        /// <param name="commandType"></param>
        /// <returns></returns>
        public List<T> GetModelList<T>(string sql, object param = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null) where T : class
        {
            return UseDbConnection((dbConn) =>
            {
                return dbConn.Query<T>(sql, param, dbTransaction, buffered, commandTimeout, commandType).ToList();
            });
        }

        /// <summary>
        /// 获取符合条件的所有数据并根据动态构建Model类委托来创建合适的返回结果(适用于临时性结果且无对应的模型实体类的情况)
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="buildModelFunc"></param>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <param name="buffered"></param>
        /// <param name="commandTimeout"></param>
        /// <param name="commandType"></param>
        /// <returns></returns>
        public T GetDynamicModel<T>(Func<IEnumerable<dynamic>, T> buildModelFunc, string sql, object param = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null)
        {
            var dynamicResult = UseDbConnection((dbConn) =>
           {
               return dbConn.Query(sql, param, dbTransaction, buffered, commandTimeout, commandType);
           });

            return buildModelFunc(dynamicResult);
        }

        /// <summary>
        /// 获取符合条件的所有指定返回结果对象的列表(复合对象【如:1对多,1对1】),param可以是SQL参数也可以是匿名对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="sql"></param>
        /// <param name="types"></param>
        /// <param name="map"></param>
        /// <param name="param"></param>
        /// <param name="transaction"></param>
        /// <param name="buffered"></param>
        /// <param name="splitOn"></param>
        /// <param name="commandTimeout"></param>
        /// <param name="commandType"></param>
        /// <returns></returns>

        public List<T> GetMultModelList<T>(string sql, Type[] types, Func<object[], T> map, object param = null, bool buffered = true, string splitOn = "Id", int? commandTimeout = null, CommandType? commandType = null)
        {
            return UseDbConnection((dbConn) =>
            {
                return dbConn.Query<T>(sql, types, map, param, dbTransaction, buffered, splitOn, commandTimeout, commandType).ToList();
            });
        }




        /// <summary>
        /// 执行SQL命令(CRUD),param可以是SQL参数也可以是要添加的实体类
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <param name="transaction"></param>
        /// <param name="commandTimeout"></param>
        /// <param name="commandType"></param>
        /// <returns></returns>
        public bool ExecuteCommand(string sql, object param = null, int? commandTimeout = null, CommandType? commandType = null)
        {
            return UseDbConnection((dbConn) =>
            {
                int result = dbConn.Execute(sql, param, dbTransaction, commandTimeout, commandType);
                return (result > 0);
            });
        }

        /// <summary>
        /// 批量转移数据(利用SqlBulkCopy实现快速大批量插入到指定的目的表及SqlDataAdapter的批量删除)
        /// </summary>
        public bool BatchMoveData(string srcSelectSql, string srcTableName, List<SqlParameter> srcPrimarykeyParams, string destConnName, string destTableName)
        {

            using (SqlDataAdapter srcSqlDataAdapter = new SqlDataAdapter(srcSelectSql, GetDbConnectionString(dbConnectionName, out dbProviderName)))
            {
                DataTable srcTable = new DataTable();
                SqlCommand deleteCommand = null;
                try
                {
                    srcSqlDataAdapter.AcceptChangesDuringFill = true;
                    srcSqlDataAdapter.AcceptChangesDuringUpdate = false;
                    srcSqlDataAdapter.Fill(srcTable);

                    if (srcTable == null || srcTable.Rows.Count <= 0) return true;

                    string notExistsDestSqlWhere = null;
                    string deleteSrcSqlWhere = null;

                    for (int i = 0; i < srcPrimarykeyParams.Count; i++)
                    {
                        string keyColName = srcPrimarykeyParams[i].ParameterName.Replace("@", "");
                        notExistsDestSqlWhere += string.Format(" AND told.{0}=tnew.{0}", keyColName);
                        deleteSrcSqlWhere += string.Format(" AND {0}=@{0}", keyColName);
                    }

                    string dbProviderName2 = null;
                    using (var destConn = new SqlConnection(GetDbConnectionString(destConnName, out dbProviderName2)))
                    {
                        destConn.Open();

                        string tempDestTableName = "#temp_" + destTableName;
                        destConn.Execute(string.Format("select top 0 * into {0} from {1}", tempDestTableName, destTableName));
                        string destInsertCols = null;
                        using (var destSqlBulkCopy = new SqlBulkCopy(destConn))
                        {
                            try
                            {
                                destSqlBulkCopy.BulkCopyTimeout = 120;
                                destSqlBulkCopy.DestinationTableName = tempDestTableName;
                                foreach (DataColumn col in srcTable.Columns)
                                {
                                    destSqlBulkCopy.ColumnMappings.Add(col.ColumnName, col.ColumnName);
                                    destInsertCols += "," + col.ColumnName;
                                }

                                destSqlBulkCopy.BatchSize = 1000;
                                destSqlBulkCopy.WriteToServer(srcTable);
                            }
                            catch (Exception ex)
                            {
                                //LogUtil.Error("SqlDapperUtil.BatchMoveData.SqlBulkCopy:" + ex.ToString(), "SqlDapperUtil.BatchMoveData");
                            }

                            destInsertCols = destInsertCols.Substring(1);

                            destConn.Execute(string.Format("insert into {1}({0}) select {0} from {2} tnew where not exists(select 1 from {1} told where {3})",
                                             destInsertCols, destTableName, tempDestTableName, notExistsDestSqlWhere.Trim().Substring(3)), null, null, 100);
                        }
                        destConn.Close();
                    }

                    deleteCommand = new SqlCommand(string.Format("DELETE FROM {0} WHERE {1}", srcTableName, deleteSrcSqlWhere.Trim().Substring(3)), srcSqlDataAdapter.SelectCommand.Connection);
                    deleteCommand.Parameters.AddRange(srcPrimarykeyParams.ToArray());
                    deleteCommand.UpdatedRowSource = UpdateRowSource.None;
                    deleteCommand.CommandTimeout = 200;

                    srcSqlDataAdapter.DeleteCommand = deleteCommand;
                    foreach (DataRow row in srcTable.Rows)
                    {
                        row.Delete();
                    }

                    srcSqlDataAdapter.UpdateBatchSize = 1000;
                    srcSqlDataAdapter.Update(srcTable);
                    srcTable.AcceptChanges();

                    return true;
                }
                catch (Exception ex)
                {
                    //LogUtil.Error("SqlDapperUtil.BatchMoveData:" + ex.ToString(), "SqlDapperUtil.BatchMoveData");
                    return false;
                }
                finally
                {
                    if (deleteCommand != null)
                    {
                        deleteCommand.Parameters.Clear();
                    }
                }
            }

        }

        /// <summary>
        /// 批量复制数据(把源DB中根据SQL语句查出的结果批量COPY插入到目的DB的目的表中)
        /// </summary>
        public TResult BatchCopyData<TResult>(string srcSelectSql, string destConnName, string destTableName, IDictionary<string, string> colMappings, Func<IDbConnection, TResult> afterCoppyFunc)
        {

            using (SqlDataAdapter srcSqlDataAdapter = new SqlDataAdapter(srcSelectSql, GetDbConnectionString(dbConnectionName, out dbProviderName)))
            {
                DataTable srcTable = new DataTable();
                TResult copyResult = default(TResult);
                try
                {
                    srcSqlDataAdapter.AcceptChangesDuringFill = true;
                    srcSqlDataAdapter.AcceptChangesDuringUpdate = false;
                    srcSqlDataAdapter.Fill(srcTable);

                    if (srcTable == null || srcTable.Rows.Count <= 0) return copyResult;


                    string dbProviderName2 = null;
                    using (var destConn = new SqlConnection(GetDbConnectionString(destConnName, out dbProviderName2)))
                    {
                        destConn.Open();
                        string tempDestTableName = "#temp_" + destTableName;
                        destConn.Execute(string.Format("select top 0 * into {0} from {1}", tempDestTableName, destTableName));
                        bool bcpResult = false;
                        using (var destSqlBulkCopy = new SqlBulkCopy(destConn))
                        {
                            try
                            {
                                destSqlBulkCopy.BulkCopyTimeout = 120;
                                destSqlBulkCopy.DestinationTableName = tempDestTableName;
                                foreach (var col in colMappings)
                                {
                                    destSqlBulkCopy.ColumnMappings.Add(col.Key, col.Value);
                                }

                                destSqlBulkCopy.BatchSize = 1000;
                                destSqlBulkCopy.WriteToServer(srcTable);
                                bcpResult = true;
                            }
                            catch (Exception ex)
                            {
                                //LogUtil.Error("SqlDapperUtil.BatchMoveData.SqlBulkCopy:" + ex.ToString(), "SqlDapperUtil.BatchMoveData");
                            }
                        }

                        if (bcpResult)
                        {
                            copyResult = afterCoppyFunc(destConn);
                        }

                        destConn.Close();
                    }

                    return copyResult;
                }
                catch (Exception ex)
                {
                    //LogUtil.Error("SqlDapperUtil.BatchCopyData:" + ex.ToString(), "SqlDapperUtil.BatchCopyData");
                    return copyResult;
                }
            }

        }


        /// <summary>
        /// 当使用了事务,则最后需要调用该方法以提交所有操作
        /// </summary>
        /// <param name="dbTransaction"></param>
        public void Commit()
        {
            try
            {
                if (dbTransaction.Connection != null && dbTransaction.Connection.State != ConnectionState.Closed)
                {
                    dbTransaction.Commit();
                }
            }
            catch
            {
                throw;
            }
            finally
            {
                if (dbTransaction.Connection != null)
                {
                    CloseDbConnection(dbTransaction.Connection);
                }
                dbTransaction.Dispose();
                dbTransaction = null;
                useDbTransaction = false;

                if (dbConnection != null)
                {
                    CloseDbConnection(dbConnection);
                }
            }
        }

        /// <summary>
        /// 当使用了事务,如果报错或需要中断执行,则需要调用该方法执行回滚操作
        /// </summary>
        /// <param name="dbTransaction"></param>
        public void Rollback()
        {
            try
            {
                if (dbTransaction.Connection != null && dbTransaction.Connection.State != ConnectionState.Closed)
                {
                    dbTransaction.Rollback();
                }
            }
            catch
            {
                throw;
            }
            finally
            {
                if (dbTransaction.Connection != null)
                {
                    CloseDbConnection(dbTransaction.Connection);
                }

                dbTransaction.Dispose();
                dbTransaction = null;
                useDbTransaction = false;
            }
        }

        ~SqlDapperUtil()
        {
            try
            {
                CloseDbConnection(dbConnection, true);
            }
            catch
            { }
        }

    }
}

优点:

  1. 多少存款和储蓄层的急需

  2. OTiggoM框架选用

  3. OSS.Core仓库储存层设计完成

  4. 调用示例

  1. 数码存款和储蓄层的需要

  2. OHavalM框架选拔

  3. OSS.Core储存层设计达成

  4. 调用示例

ColumnAttributeTypeMapper扶助类相关代码如下:(假设不考虑实体类的习性与表字段不平等的图景,如下映射类能够不要求充裕,同时SqlDapperUtil中移除相关注重ColumnAttributeTypeMapper逻辑即可)

一 、开源、轻量、小巧、上手不难。

   上边的落实部分中也许须求你对.NET的
泛型,委托,扩大,表达式等有3个基础明白。便是因为那几个语言特征,方便我们对操作共性的抽取统一。

   上面的落实部分中或然须求您对.NET的
泛型,委托,扩充,表明式等有一个基础领会。就是因为那几个语言特色,方便大家对操作共性的抽取统一。

using Dapper;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace KYExpress.Common
{
    public class ColumnAttributeTypeMapper<T> : FallbackTypeMapper
    {
        public ColumnAttributeTypeMapper()
            : base(new SqlMapper.ITypeMap[]
                {
                    new CustomPropertyTypeMap(
                       typeof(T),
                       (type, columnName) =>
                           type.GetProperties().FirstOrDefault(prop =>
                               prop.GetCustomAttributes(false)
                                   .OfType<ColumnAttribute>()
                                   .Any(attr => attr.Name == columnName)
                               )
                       ),
                    new DefaultTypeMap(typeof(T))
                })
        {
        }
    }

    [AttributeUsage(AttributeTargets.Property, AllowMultiple = true)]
    public class ColumnAttribute : Attribute
    {
        public string Name { get; set; }
    }

    public class FallbackTypeMapper : SqlMapper.ITypeMap
    {
        private readonly IEnumerable<SqlMapper.ITypeMap> _mappers;

        public FallbackTypeMapper(IEnumerable<SqlMapper.ITypeMap> mappers)
        {
            _mappers = mappers;
        }


        public ConstructorInfo FindConstructor(string[] names, Type[] types)
        {
            foreach (var mapper in _mappers)
            {
                try
                {
                    ConstructorInfo result = mapper.FindConstructor(names, types);
                    if (result != null)
                    {
                        return result;
                    }
                }
                catch (NotImplementedException)
                {
                }
            }
            return null;
        }

        public SqlMapper.IMemberMap GetConstructorParameter(ConstructorInfo constructor, string columnName)
        {
            foreach (var mapper in _mappers)
            {
                try
                {
                    var result = mapper.GetConstructorParameter(constructor, columnName);
                    if (result != null)
                    {
                        return result;
                    }
                }
                catch (NotImplementedException)
                {
                }
            }
            return null;
        }

        public SqlMapper.IMemberMap GetMember(string columnName)
        {
            foreach (var mapper in _mappers)
            {
                try
                {
                    var result = mapper.GetMember(columnName);
                    if (result != null)
                    {
                        return result;
                    }
                }
                catch (NotImplementedException)
                {
                }
            }
            return null;
        }


        public ConstructorInfo FindExplicitConstructor()
        {
            return _mappers
                .Select(mapper => mapper.FindExplicitConstructor())
                .FirstOrDefault(result => result != null);
        }
    }

}

② 、帮助的数据库还蛮多的,
Mysql,SqlLite,Sqlserver,Oracle等一比比皆是的数据库。

一. 数量存款和储蓄层须要

一. 数码存款和储蓄层须求

运用示例方法如下:

③ 、Dapper原理通过Emit反射IDataReader的队列队列来非常的慢的拿到和爆发对象。品质一般很牛逼的样板

  既然是一个整机的种类,数据访问是其最中央的一些,同时,数据访问也是漫天项目最容易并发瓶颈的地点。在作者的分开中,其承担的角色是承担整个数据的输入输出,不仅仅是对准单数据库(有时甚至多库),有时还亟需做到一级缓存的兑现,给逻辑层提供最基础的多少支持。

  既然是1个完整的门类,数据访问是其最基本的一部分,同时,数据访问也是漫天项目最简单出现瓶颈的地点。在自家的划分中,其承受的剧中人物是负担整个数据的输入输出,不仅仅是针对单数据库(有时依然多库),有时还索要形成一级缓存的贯彻,给逻辑层提供最基础的数额支撑。

 1.先来模拟各样查询数据(由于是直接写模拟SQL输出,故并未原则,也惠及我们COPY后一直能够测试结果)

缺点:

 
 业务永远是在转变的,那么项目也要全体飞速形成的能力,所以本人期望数据层能够保险相对的简易,在结构上尽量裁减复杂的耦合查询,在性质上尽量减弱不须求的消耗,例如反射的豁达利用。同时针对每种事情对象实现数据库层面为主的CRUD统一封装完毕。要是有亟待的时候还可以在至少的更改下进入缓存的更新。(对于怎么着落到实处不一致模块不一致缓存存款和储蓄策略,像Redis,Memcached会在前面小说介绍)

 
 业务永远是在变化的,那么项目也要享有神速形成的力量,所以本身期望数据层能够保险相对的简约,在结构上尽量减弱复杂的耦合查询,在品质上尽量裁减不须求的消耗,例如反射的恢宏利用。同时针对各个事情对象实现数据库层面为主的CRUD统一封装实现。假若有亟待的时候还是能够在至少的变更下参预缓存的创新。(对于怎么兑现差异模块区别缓存存储策略,像Redis,Memcached会在后头作品介绍)

            //实例化SqlDapperUtil对象,构造函数是config文件中的connectionStrings的Name名
            var dapper = new SqlDapperUtil("LmsConnectionString");

            //查询1个值
            DateTime nowTime = dapper.GetValue<DateTime>("select getdate() as nowtime");


            //查询1行值,并转换成字典(这对于临时查询多个字段而无需定义实体类有用)
            Dictionary<string, dynamic> rowValues = dapper.GetFirstValues("select 0 as col0,1 as col1,2 as col2");


            //查询1行并返回实体类
            Person person = dapper.GetModel<Person>("select '张三' as Name,22 as Age,'2018-1-1' as BirthDay,'中国广东深圳' as HomeAddr");


            //查询1行表字段与实体类属性不一致映射
            Person person2 = dapper.GetModel<Person>("select '张三' as Name,22 as Age,'2018-1-1' as BirthDay,'中国广东深圳' as HomeAddress");


            //查询多行返回实体集合
            var persons = dapper.GetModelList<Person>(@"select '张三' as Name,22 as Age,'2018-1-1' as BirthDay,'中国广东深圳' as HomeAddr union all
                                                                            select '李四' as Name,25 as Age,'2018-10-1' as BirthDay,'中国广东深圳' as HomeAddress union all
                                                                            select '王五' as Name,35 as Age,'1982-10-1' as BirthDay,'中国广东广州' as HomeAddress
                                                                        ");


            //查询多行返回1对1关联实体结果集
            var personWithCarResult = dapper.GetMultModelList<Person>(@"select t1.*,t2.* from
                                                                                                    (select '张三' as Name,22 as Age,'2018-1-1' as BirthDay,'中国广东深圳' as HomeAddr union all
                                                                                                    select '李四' as Name,25 as Age,'2018-10-1' as BirthDay,'中国广东深圳' as HomeAddress union all
                                                                                                    select '王五' as Name,35 as Age,'1982-10-1' as BirthDay,'中国广东广州' as HomeAddress)as t1 inner join
                                                                                                    (
                                                                                                    select '张三' as DriverName,'大众' as Brand,'2018-8-8' as ManufactureDate union all
                                                                                                    select '李四' as DriverName,'奔驰' as Brand,'2018-1-8' as ManufactureDate union all
                                                                                                    select '王五' as DriverName,'奥迪' as Brand,'2017-8-8' as ManufactureDate
                                                                                                    )as t2
                                                                                                    on t1.Name=t2.DriverName
                                                                        ", new[] { typeof(Person), typeof(CarInfo) }, (objs) =>
                                                                         {
                                                                             Person personItem = objs[0] as Person;
                                                                             CarInfo carItem = objs[1] as CarInfo;
                                                                             personItem.Car = carItem;
                                                                             return personItem;
                                                                         }, splitOn: "DriverName");




            //查询多行返回1对多关联实体结果=personWithManyCars
            List<Person> personWithManyCars = new List<Person>();
            dapper.GetMultModelList<Person>(@"select t1.*,t2.* from
                                                                                                    (select '张三' as Name,22 as Age,'2018-1-1' as BirthDay,'中国广东深圳' as HomeAddr union all
                                                                                                    select '李四' as Name,25 as Age,'2018-10-1' as BirthDay,'中国广东深圳' as HomeAddress union all
                                                                                                    select '王五' as Name,35 as Age,'1982-10-1' as BirthDay,'中国广东广州' as HomeAddress)as t1 inner join
                                                                                                    (
                                                                                                    select '张三' as DriverName,'大众' as Brand,'2018-8-8' as ManufactureDate union all
                                                                                                    select '张三' as DriverName,'奔驰' as Brand,'2018-1-8' as ManufactureDate union all
                                                                                                    select '张三' as DriverName,'奥迪' as Brand,'2017-8-8' as ManufactureDate
                                                                                                    )as t2
                                                                                                    on t1.Name=t2.DriverName
                                                                        ", new[] { typeof(Person), typeof(CarInfo) }, (objs) =>
                                                                        {
                                                                            Person personItem = objs[0] as Person;
                                                                            CarInfo carItem = objs[1] as CarInfo;

                                                                            Person personItemMain = personWithManyCars.FirstOrDefault(p => p.Name == personItem.Name);
                                                                            if (personItemMain == null)
                                                                            {
                                                                                personItem.Cars = new List<CarInfo>();
                                                                                personItemMain = personItem;
                                                                                personWithManyCars.Add(personItemMain);
                                                                            }

                                                                            personItemMain.Cars.Add(carItem);
                                                                            return personItemMain;

                                                                        }, splitOn: "DriverName");

作为一款OGL450M太过火轻量级了,根据目的自动生成sql的功能依然空白,供给团结来扩充,

  同时,对于三个略带有点规模的连串来说,化解数据库访问的最飞速做法就是兑现读写分离,所以,笔者希望这么些框架能够在一上马在底部就落到实处了读写分离的支撑,避防止中期再重头对工作代码的雅量修改。  

  同时,对于1个有个别有点规模的类型以来,消除数据库访问的最便捷做法正是贯彻读写分离,所以,作者愿意以此框架能够在一上马在底部就贯彻了读写分离的扶助,以幸免前期再重头对事情代码的汪洋改动。  

2.底下是出现说法如何开始展览增、删、改以及动态查询的状态:

本来那也是长项, 好声音的上将们时不时说某人正是张白纸……

二. O本田CR-VM 框架选用

二. O牧马人M 框架选取

            //使用事务创建多张表,多条SQL语句写在一起
            try
            {
                dapper.UseDbTransaction();
                dapper.ExecuteCommand(@"create table T_Person(Name nvarchar(20) primary key,Age int,BirthDay datetime,HomeAddress nvarchar(200));
                                                    create table T_CarInfo(DriverName nvarchar(20) primary key,Brand nvarchar(50),ManufactureDate datetime)");
                dapper.Commit();
            }
            catch (Exception ex)
            {
                dapper.Rollback();
                //记日志
            }

            //使用事务批量插入多张表的多个记录,多条SQL分多次执行(参数支持批量集合对象传入,无需循环)
            try
            {
                dapper.UseDbTransaction();
                dapper.ExecuteCommand(@"insert into T_Person
select N'张三' as Name,22 as Age,'2018-1-1' as BirthDay,N'中国广东深圳' as HomeAddress union all
select N'李四' as Name,25 as Age,'2018-10-1' as BirthDay,N'中国广东深圳' as HomeAddress union all
select N'王五' as Name,35 as Age,'1982-10-1' as BirthDay,N'中国广东广州' as HomeAddress");


                var carInfos = dapper.GetModelList<CarInfo>(@"
select N'张三' as DriverName,N'大众' as Brand,'2018-8-8' as ManufactureDate union all
select N'李四' as DriverName,N'奔驰' as Brand,'2018-1-8' as ManufactureDate union all
select N'王五' as DriverName,N'奥迪' as Brand,'2017-8-8' as ManufactureDate");

                dapper.ExecuteCommand(@"insert into T_CarInfo(DriverName,Brand,ManufactureDate) Values(@DriverName,@Brand,@ManufactureDate)", carInfos);

                dapper.Commit();
            }
            catch (Exception ex)
            {
                dapper.Rollback();
                //记日志
            }

            //执行删除,有参数,参数可以是实体类、匿名对象、字典(如有需要,可以是集合,以支持批量操作)
            bool deleteResult = dapper.ExecuteCommand("delete from T_CarInfo where DriverName=@DriverName", new { DriverName = "李四" });

            //构建动态执行SQL语句(以下是更新,查询类似)
            StringBuilder updateSqlBuilder = new StringBuilder();
            var updateParams = new Dictionary<string, object>();

            if (1 == 1)
            {
                updateSqlBuilder.Append(",Age=@Age");
                updateParams["Age"] = 20;
            }

            if (2 == 2)
            {
                updateSqlBuilder.Append(",BirthDay=@BirthDay");
                updateParams["BirthDay"] = Convert.ToDateTime("2010-1-1");
            }

            if (3 == 3)
            {
                updateSqlBuilder.Append(",HomeAddress=@HomeAddress");
                updateParams["HomeAddress"] = "中国北京天安门";
            }

            string updateSql = string.Concat("update T_Person set ", updateSqlBuilder.ToString().TrimStart(','), "  where  Name=@Name");
            updateParams["Name"] = "张三";

            bool updateResult = dapper.ExecuteCommand(updateSql, updateParams);

            //查询返回动态自定义结果,之所以不直接返回Dynamic就好,是因为可读性差,故尽可能的在执行后就转成指定的类型
            Tuple<string, int> hasCarInfo = dapper.GetDynamicModel<Tuple<string, int>>((rs) =>
            {
                var result = rs.First();
                return Tuple.Create<string, int>(result.Name, result.CarCount);
            }, @"select a.Name,count(b.DriverName) as CarCount from T_Person a left join T_CarInfo b on a.Name=b.DriverName where a.Name=@Name group by a.Name", new { Name = "张三" });

所以针对Dapper已经有好多老奸巨猾的增添类型了,Dapper.Rainbow、Dapper.Contrib,DapperExtensions。

  当然,假如为了简单和属性,直接ADO.NET连接理论上的话是比较灵通的做法,不过尔尔会造成大气的双重操作逻辑代码,同时也会导致代码的杂乱,扩大入保障护复杂度。作为技术职员,不仅须要缓解工作难题提升功效,同时也要进步协调的频率,所以作者会选用四个OCRUISERM框架来形成都部队分基础工作。

  当然,假如为了简单和属性,直接ADO.NET连接理论上的话是相比灵通的做法,不过尔尔会促成大批量的双重操作逻辑代码,同时也会造成代码的眼花缭乱,扩大入保证障复杂度。作为技术职员,不仅供给化解工作难点进步功效,同时也要提升自身的功用,所以笔者会选拔一个O大切诺基M框架来形成都部队分基础工作。

3.还有四个主意:BatchCopyData、BatchMoveData,那是分外封装的,不是基于Dapper而是基于原生的Ado.net及BCP,指标是高效大批量跨DB跨表COPY数据或更换数据,使用也不复杂,提出想询问的网上好友能够查阅自个儿过去的稿子

作者们那里介绍的是DapperExtensions

  当前在.NET种类下,开源的ORAV4M框架很多,如:Entityframework,NHibernate,iBATIS.NET,Dapper等等,各有特色,基于前边作者说的,保证效能的同时,兼顾简单还是能够最大程度减少品质的开销,并且提供.net
standard标准库下的辅助。那里相比较之后笔者选拔Dapper这么些半自动化的OCRUISERM作为仓库储存层的根基框架,接纳原因如下:

  当前在.NET类别下,开源的OKoleosM框架很多,如:Entityframework,NHibernate,iBATIS.NET,Dapper等等,各有特色,基于前边小编说的,有限支撑功效的同时,兼顾简单还可以够最大程度收缩品质的损耗,并且提供.net
standard标准库下的援救。那里相比较之后作者选拔Dapper这些半自动化的O中华VM作为仓库储存层的根基框架,采用原因如下:

以上示例方法用到了七个类,如下:

表明式解析,仓库储存层的沉思及落到实处。dapper-dot-net源码:
(更新频率快,项目包罗了各个除了Dapper-Extensions的增添项目)

  1. 其布局不难,整个封装首要集中Dapper.cs文件中,体量十分的小

  1. 其结构简单,整个封装主要汇聚Dapper.cs文件中,体积非常小

        class Person
        {
            public string Name { get; set; }


            public int Age { get; set; }

            public DateTime BirthDay { get; set; }

            [Column(Name = "HomeAddress")]
            public string HomeAddr { get; set; }

            public CarInfo Car { get; set; }

            public List<CarInfo> Cars { get; set; }
        }

        class CarInfo
        {
            public string Brand { get; set; }

            public DateTime ManufactureDate { get; set; }

            public string DriverName { get; set; }
        }

Dapper-Extensions源码:

      2. 卷入成效不难强大,对原生SQL的匡助上很灵活

      2. 包装成效不难强大,对原生SQL的支持上很灵巧

SqlDapperUtil类中凭借了前头我封装的类:如:MemoryCacheUtil(本地内部存款和储蓄器注重缓存实用工具类)、ConfigUtil(配置文件管理工科具类)、EncryptUtil(加密工具类),假诺项目中不想引用这一个类,可以移除或改成任何格局即可。

Dapper-Extensions的优点

    那一点大概完胜其余框架,无需任何多余的设置,同时基本上你可调用全体原生ADO.NET的职能,sql语句完全本人掌控,却又无需关切command的参数赋值,以及结果实体转换等。

    这一点大概完胜别的框架,无需任何多余的装置,同时基本上你可调用全部原生ADO.NET的效益,sql语句完全本人掌握控制,却又无需关怀command的参数赋值,以及结果实体转换等。

 此外说贝拉米(Bellamy)下,为了防止万一和削减因DB连接未即时放出导致的连接池不足等原因,故暗中认可执行全部的CRUD方法都是用完即自由,但有一种景况不会放出正是选取了工作,若选用工作,则少不了配套使用:UseDbTransaction、Commit、或失利执行Rollback,不然大概造成未能及时放出对象,当然最后当SqlDapperUtil实例被回收后事务若没有提交或回滚,会强制执行回滚操作并释放工作及连接对象,幸免大概的财富浪费情形。

1、开源

  3. 性能上的敏捷

  3. 本性上的快捷

自然早就想总括一下那篇小说,但直接由于工作太忙没有时间,今天采取加班商量.NET
CORE的空当时间达成,请大家支持,有好东西作者决然会分享的,纵然不必然高大上,但一定实用且项目中有实战过的。

贰 、针对Dapper封装了常用的CRUD方法,有独立的询问语法。

    很多O兰德酷路泽M的实业映射通过反射来形成,那一点上Dapper再度表现其魔力,在Commond参数赋值,以及实体转换等关键模块,使用了Reflection.Emit功用,直接达成了MSIL编写翻译层面包车型客车赋值达成,之所以说间接,是因为其本人代码还须要编写翻译器生成IL代码。在运营时根据项目属性动态创制赋值委托方法。

    很多OLANDM的实业映射通过反射来形成,这一点上Dapper再度表现其魅力,在Commond参数赋值,以及实体转换等重点模块,使用了Reflection.Emit功效,直接完成了MSIL编写翻译层面包车型客车赋值达成,之所以说直接,是因为其本身代码还索要编写翻译器生成IL代码。在运转时依据项目属性动态创立赋值委托方法。

三 、供给映射的实体类本身0配置,无需加个性什么的。是经过独立的映射类来处理,能够安装类映射到DB的外号,字段的别称等等。

 

 

Dapper-Extensions的缺点:

三. OSS.Core仓库储存层设计达成

三. OSS.Core仓库储存层设计完结

壹 、好几年没更新了

 
 通过Dapper可以实现在数据库访问片段一层简易的包装,然而我依然亟待手动编写不少的sql语句,同时还要实行参数化的拍卖,包含数据的读写分离等。那么这么些功效的贯彻自笔者将在OSS.Core.RepDapper中形成,为了有利于清楚,先贴出一个粗略的卷入后的不二法门调用传输流程:

 
 通过Dapper能够达成在数据库访问一些一层简易的包装,可是我依然要求手动编写不少的sql语句,同时还要开始展览参数化的处理,包蕴数据的读写分离等。那么那一个效应的贯彻自小编将在OSS.Core.RepDapper中做到,为了有利于清楚,先贴出3个简练的包裹后的情势调用传输流程:

二 、不帮忙oracle(木有oracle的白话,已经化解)

金沙注册送58 1

金沙注册送58 2

三 、不能够同时支持两种数据库

  在这几个图里呈现三个简单易行的方式调用流程,围绕那张图的几在那之中央部分,小编分别介绍下:

  在这些图里彰显叁个简便的主意调用流程,围绕那张图的多少个为主部分,小编分别介绍下:

四 、部分代码某个bug

  1. 接口设计

  1. 接口设计

下面先简单介绍一下Dapper的中坚语法。

  因为自个儿希望那么些是共同体的言传身教项目,所今后面希望能够包容分裂数据库,由此对外的储存访问都依据接口调用。当然假如您的类型根本未曾切换数据库的需求,作者更建议去掉这一环节,直接在基类中落实单例形式,业务逻辑层直接调用。

  因为笔者愿意以此是完好的言传身教项目,所在此之前边希望能够合作差异数据库,由此对外的仓库储存访问都基于接口调用。当然借使你的项目根本未曾切换数据库的要求,小编更建议去掉这一环节,间接在基类中贯彻单例情势,业务逻辑层直接调用。

Dapper就贰个.cs文件,能够放置项目代码中一贯编写翻译,也得以间接引用DLL文件。

  图中能够看到接口层独立于贯彻部分,作者将现实工作实人体模型型和接口
单独放在了OSS.Core.DomainMos
类库中,一方面是为了实人体模型型在各模块中的共用,另一方面解耦业务逻辑层(瑟维斯s)和储存层(Reps)之间的借助关系。

  图中得以看看接口层独立于达成部分,小编将现实事情实体模型和接口
单独放在了OSS.Core.DomainMos
类库中,一方面是为了实人体模型型在各模块中的共用,另一方面解耦业务逻辑层(Services)和储存层(Reps)之间的倚重关系。

Dapper对DB的操作重视于Connection,为了扶助多库,大家用IDbConnection conn

  同时1个项目中数据库访问代码多数都会以CRUD为主,所以那里笔者定义了叁个基础接口(IBaseRep),其包蕴的办法首要有(表明式部分在末端介绍):

  同时一个项目中数据库访问代码多数都会以CRUD为主,所以那里本身定义了一个基础接口(IBaseRep),其蕴藉的不二法门重要有(表明式部分在后面介绍):

using (IDbConnection conn = GetConnection    {        const string query = "select * from XO order by id desc";        return conn.Query<XOEntity>(query,null);    }

金沙注册送58 3

金沙注册送58 4

下边是带参数的语法

  具体的政工数据接口继承至基础接口就好,个中表明式部分是笔者本身做了三个包裹,后面会简单介绍。

  具体的事情数据接口继承至基础接口就好,个中表明式部分是自小编本身做了贰个装进,后面会不难介绍。

int xoID=666; //变量主键
 using (IDbConnection conn = GetConnection    {        const string query = "select * from XO where Id=@MyID";        return conn.Query<XOEntity>(query, new { MyID = xoID});                            }

 

 

各类措施都重载了思想政治工作的操作,一般的数据库操作都支持。可是每一回执行都亟待传递sql,而且每一趟都要使用Using,望着不爽啊,
那……

  2.
存款和储蓄基类完毕(BaseRep)

  2.
囤积基类落成(BaseRep)

好吧上面简单介绍下利用Dapper-Extensions的基本语法(在Dapper-Extensions
的根底上用了Repository方式,代码效果如下)。

  首先,如图所示,大家贯彻了读写分离的七个扩展,其实说到底都会经过Excute方法,那么那里显得下方法的有血有肉落到实处:

  首先,如图所示,大家达成了读写分离的七个扩充,其实说到底都会经过Excute方法,那么那里显得下方法的现实落到实处:

            //实体类            DemoEntity entity = new DemoEntity();            //根据实体主键删除            this.Delete<DemoEntity>;            //根据主键ID删除            this.Delete<DemoEntity>(1);            //增加            this.Insert<DemoEntity>;            //更新            bool result = this.Update<DemoEntity>;            //根据主键返回实体            entity = this.GetById<DemoEntity>(1);            //返回 行数            this.Count<DemoEntity>(new { ID = 1 });            //查询所有            IEnumerable<DemoEntity> list = this.GetAll<DemoEntity>();            IList<ISort> sort = new List<ISort>();            sort.Add(new Sort { PropertyName = "ID", Ascending = false });            //条件查询            list = this.GetList<DemoEntity>(new { ID = 1, Name = "123" }, sort);            //orm 拼接条件 查询            IList<IPredicate> predList = new List<IPredicate>();            predList.Add(Predicates.Field<DemoEntity>(p => p.Name, Operator.Like, "不知道%"));            predList.Add(Predicates.Field<DemoEntity>(p => p.ID, Operator.Eq, 1));            IPredicateGroup predGroup = Predicates.Group(GroupOperator.And, predList.ToArray;                        list = this.GetList<DemoEntity>(predGroup);            //分页查询            long allRowsCount = 0;            this.GetPageList<DemoEntity>(1, 10, out allRowsCount, new { ID = 1 }, sort);

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在说O揽胜极光M此前,依然要说一下HY.DataAccess那么些模块

  能够观察在那几个法子提供了一个针对IDbConnection的信托,提供调用层自由使用Dapper方法的还要,统一了数额访问方法入口,便于日志记录,和排查。

  可以观望在那一个方法提供了二个对准IDbConnection的嘱托,提供调用层自由使用Dapper方法的同时,统一了数据访问方法入口,便于日志记录,和排查。

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以此模块是对数码访问提供的1个Helper的功力,里面含有了
各类DB的SqlHelper,分页。

  其次,在许多门类中会出现用户和订单在分裂库中的那类情形,因为关乎到分库的图景,所以须求子类中能有涂改连接串能力,那么那里小编通过构造函数的花样,提供了三个可空参数:

  其次,在许多项目中会出现用户和订单在差别库中的这类意况,因为关乎到分库的场地,所以须求子类中能有涂改连接串能力,那么那里自个儿通过构造函数的情势,提供了五个可空参数:

DBHelper 都持续自IDBHelper.cs

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  能够看出,假若子类中定义了友好的连天串,则以子类自定义为主,不然走默许的连日音信。

  能够阅览,假诺子类中定义了祥和的连接串,则以子类自定义为主,不然走暗中认可的延续音讯。

using System.Data.Common;using System.Data;namespace HY.DataAccess{    /// <summary>    /// 提供对数据库的基本操作,连接字符串需要在数据库配置。    /// </summary>    public interface IDBHelper    {        /// <summary>        /// 生成分页SQL语句        /// </summary>        /// <param name="pageIndex"></param>        /// <param name="pageSize"></param>        /// <param name="selectSql"></param>        /// <param name="sqlCount"></param>        /// <param name="orderBy"></param>        /// <returns></returns>        string GetPagingSql(int pageIndex, int pageSize, string selectSql, string sqlCount, string orderBy);        /// <summary>        /// 开始一个事务        /// </summary>        /// <returns></returns>        DbTransaction BeginTractionand();        /// <summary>        /// 开始一个事务        /// </summary>        /// <param name="connKey">数据库连接字符key</param>        DbTransaction BeginTractionand(string connKey);        /// <summary>        /// 回滚事务        /// </summary>        /// <param name="dbTransaction">要回滚的事务</param>        void RollbackTractionand(DbTransaction dbTransaction);        /// <summary>        /// 结束并确认事务        /// </summary>        /// <param name="dbTransaction">要结束的事务</param>        void CommitTractionand(DbTransaction dbTransaction);        #region DataSet        /// <summary>        /// 执行sql语句,ExecuteDataSet 返回DataSet        /// </summary>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        DataSet ExecuteDataSet(string commandText, CommandType commandType);        /// <summary>        /// 执行sql语句,ExecuteDataSet 返回DataSet        /// </summary>        /// <param name="connKey">数据库连接字符key</param>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        DataSet ExecuteDataSet(string connKey, string commandText, CommandType commandType);        /// <summary>        /// 执行sql语句,ExecuteDataSet 返回DataSet        /// </summary>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        /// <param name="parameterValues">参数</param>        DataSet ExecuteDataSet(string commandText, CommandType commandType, params DbParameter[] parameterValues);        /// <summary>        /// 执行sql语句,ExecuteDataSet 返回DataSet        /// </summary>        /// <param name="connKey">数据库连接字符key</param>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        /// <param name="parameterValues">参数</param>        DataSet ExecuteDataSet(string connKey, string commandText, CommandType commandType, params DbParameter[] parameterValues);        #endregion        #region ExecuteNonQuery        /// <summary>        /// 执行sql语句,返回影响的行数        /// </summary>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        int ExecuteNonQuery(string commandText, CommandType commandType);        /// <summary>        /// 执行sql语句,返回影响的行数        /// </summary>        /// <param name="connKey">数据库连接字符key</param>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        int ExecuteNonQuery(string connKey, string commandText, CommandType commandType);        /// <summary>        /// 执行sql语句,返回影响的行数        /// </summary>        /// <param name="trans">事务对象</param>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        int ExecuteNonQuery(DbTransaction trans, string commandText, CommandType commandType);        /// <summary>        /// 执行sql语句,返回影响的行数        /// </summary>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        /// <param name="parameterValues">参数</param>        int ExecuteNonQuery(string commandText, CommandType commandType, params DbParameter[] parameterValues);        /// <summary>        /// 执行sql语句,返回影响的行数        /// </summary>        /// <param name="connKey">数据库连接字符key</param>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        /// <param name="parameterValues">参数</param>        int ExecuteNonQuery(string connKey, string commandText, CommandType commandType, params DbParameter[] parameterValues);        /// <summary>        /// 执行sql语句,返回影响的行数        /// </summary>        /// <param name="trans">事务对象</param>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        /// <param name="parameterValues">参数</param>        int ExecuteNonQuery(DbTransaction trans, string commandText, CommandType commandType, params DbParameter[] parameterValues);        #endregion        #region IDataReader        /// <summary>        /// 执行sql语句,ExecuteReader 返回IDataReader        /// </summary>           /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        IDataReader ExecuteReader(string commandText, CommandType commandType);        /// <summary>        /// 执行sql语句,ExecuteReader 返回IDataReader        /// </summary>         /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        /// <param name="parameterValues">参数</param>        IDataReader ExecuteReader(string commandText, CommandType commandType, params DbParameter[] parameterValues);        /// <summary>        /// 执行sql语句,ExecuteReader 返回IDataReader        /// </summary>        /// <param name="connKey">数据库连接字符key</param>                /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        IDataReader ExecuteReader(string connKey, string commandText, CommandType commandType);        /// <summary>        /// 执行sql语句,ExecuteReader 返回IDataReader        /// </summary>        /// <param name="connKey">数据库连接字符key</param>                /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        /// <param name="parameterValues">参数</param>        IDataReader ExecuteReader(string connKey, string commandText, CommandType commandType, params DbParameter[] parameterValues);        #endregion        #region ExecuteScalar        /// <summary>        /// 执行sql语句,ExecuteScalar 返回第一行第一列的值        /// </summary>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        object ExecuteScalar(string commandText, CommandType commandType);        /// <summary>        /// 执行sql语句,ExecuteScalar 返回第一行第一列的值        /// </summary>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        /// <param name="parameterValues">参数</param>        object ExecuteScalar(string commandText, CommandType commandType, params DbParameter[] parameterValues);        /// <summary>        /// 执行sql语句,ExecuteScalar 返回第一行第一列的值        /// </summary>        /// <param name="trans">事务</param>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        object ExecuteScalar(DbTransaction trans, string commandText, CommandType commandType);        /// <summary>        /// 执行sql语句,ExecuteScalar 返回第一行第一列的值        /// </summary>        /// <param name="connKey">数据库连接字符key</param>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        object ExecuteScalar(string connKey, string commandText, CommandType commandType);        /// <summary>        /// 执行sql语句,ExecuteScalar 返回第一行第一列的值        /// </summary>        /// <param name="connKey">数据库连接字符key</param>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        /// <param name="parameterValues">参数</param>        object ExecuteScalar(string connKey, string commandText, CommandType commandType, params DbParameter[] parameterValues);        /// <summary>        /// 执行sql语句,ExecuteScalar 返回第一行第一列的值        /// </summary>        /// <param name="trans">事务</param>        /// <param name="commandText">sql语句</param>        /// <param name="commandType"></param>        /// <param name="parameterValues">参数</param>        /// <returns></returns>        object ExecuteScalar(DbTransaction trans, string commandText, CommandType commandType, params DbParameter[] parameterValues);        #endregion    }}

  

  

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  最终,大家也达成了针对基础接口方法的现实落到实处,举一演示:

  最终,大家也达成了针对基础接口方法的有血有肉完毕,举一演示:

IDBSession.cs 对数据访问对象的概念

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  同时,为了确认保障子类中可见投入缓存处理,所以选用了虚方法(virtual)的款型,保障子类能够重写。

  同时,为了保险子类中能够加入缓存处理,所以使用了虚方法(virtual)的款型,保险子类能够重写。

using System;using System.Data;namespace HY.DataAccess{    /// <summary>    /// 数据库接口    /// </summary>    public interface IDatabase    {        IDbConnection Connection { get; }        DatabaseType DatabaseType { get; }        string ConnKey { get; }    }    /// <summary>    /// 数据库类对象    /// </summary>    public class Database : IDatabase    {        public IDbConnection Connection { get; private set; }        public DatabaseType DatabaseType { get; private set; }        public string ConnKey { get; set; }        public Database(IDbConnection connection)        {            Connection = connection;        }        public Database(DatabaseType dbType, string connKey)        {            DatabaseType = dbType;            ConnKey = connKey;            Connection = SqlConnectionFactory.CreateSqlConnection(dbType, connKey);        }    }    /// <summary>    /// 数据连接事务的Session接口    /// </summary>    public interface IDBSession : IDisposable    {        string ConnKey { get; }        DatabaseType DatabaseType { get; }        IDbConnection Connection { get; }        IDbTransaction Transaction { get; }        IDbTransaction Begin(IsolationLevel isolation = IsolationLevel.ReadCommitted);        void Commit();        void Rollback();    }}

 

 

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  3. 基于Connection的扩展

  3. 基于Connection的扩展

SqlConnectionFactory.cs 那么些类是运用工厂方式开创DB连接的包装,代码如下:

  那个地方主要分为五个部分,a. 表明式的辨析,以及参数化的处理   b.
扩大Connection的Insert,Update…等Dapper没有扩充的法子:

  那几个地方重点分为五个部分,a. 表明式的解析,以及参数化的处理   b.
扩充Connection的Insert,Update…等Dapper没有扩展的措施:

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  a.
熟悉Expression表达式的情人应该相比较驾驭,表达式自个儿是一个树形接口,依据差别的门类,能够不断的解析其子表明式,直到不拥有继续分析的大概。所以那些就很不难正是递归的频频迭代,依照其区别的NodeType能够组建分裂的sql成分,因为代码较长,可以瞻仰github下的SqlExpressionVisitor.cs类,当中参数的赋值部分,没有选用反射,而是使用的反射发射,代码详见SqlParameterEmit.cs

  a.
熟谙Expression表明式的爱侣应该比较领会,表明式本身是三个树形接口,依据区别的品种,能够持续的解析其子表明式,直到不负有继续分析的或是。所以这几个就相当粗略正是递归的频频迭代,根据其分化的NodeType能够组建分化的sql成分,因为代码较长,能够参见github下的SqlExpressionVisitor.cs类,个中参数的赋值部分,没有选择反射,而是接纳的反射发射,代码详见SqlParameterEmit.cs

using System;using System.Collections.Generic;using System.Configuration;using System.Data;namespace HY.DataAccess{    public enum DatabaseType    {            SqlServer,        MySql,        Oracle,        DB2    }    public class SqlConnectionFactory    {        public static IDbConnection CreateSqlConnection(DatabaseType dbType, string strKey)        {            IDbConnection connection = null;            string strConn = ConfigurationManager.ConnectionStrings[strKey].ConnectionString;            switch             {                case DatabaseType.SqlServer:                    connection = new System.Data.SqlClient.SqlConnection;                    break;                case DatabaseType.MySql:                    //connection = new MySql.Data.MySqlClient.MySqlConnection;                    //break;                case DatabaseType.Oracle:                    //connection = new Oracle.DataAccess.Client.OracleConnection;                    connection = new System.Data.OracleClient.OracleConnection;                    break;                case DatabaseType.DB2:                    connection = new System.Data.OleDb.OleDbConnection;                    break;            }            return connection;        }    }}

  b.
有了表明式的扩张之后,就足以获得相应的sql和参数,通过this扩大Connection方法即可,代码见ConnoctionExtention.cs

  b.
有了表达式的恢弘之后,就足以收获相应的sql和参数,通过this扩大Connection方法即可,代码见ConnoctionExtention.cs

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OENVISIONM也不是大智大勇的,比如做大数额的批量计划什么的,依然须要SqlHelper,加上一些人就喜欢DataTable或然DataSet。

四. 调用示例

四. 调用示例

之所以SqlHelper作为基础,OXC60M作为扶助,万无一失啊。

  1. 我们定义二个不难UserInfoMo实体(包括mobile等属性)

  1. 大家定义1个简单UserInfoMo实体(包涵mobile等品质)

下边说说O福特ExplorerM那块的完成方式。见下截图

  2. 定义接口  IUserInfoRep: IBaseRep

  2. 定义接口  IUserInfoRep: IBaseRep

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  3. 定义完成类  UserInfoRep : BaseRep, IUserInfoRep

  3. 概念达成类  UserInfoRep : BaseRep, IUserInfoRep

IDataServiceRepository.cs(提供业务层使用,里面包车型客车不二法门不帮衬传递sql,包蕴sql的口舌最佳依然放在数据层操作的好)

  在不添加别的代码的功底上,大家就能够形成上面包车型大巴调用:

  在不添加任何代码的基础上,大家就足以形成上边包车型大巴调用:

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using System.Collections.Generic;using System.Data;using DapperExtensions;using HY.DataAccess;namespace HY.ORM{    public interface IDataServiceRepository    {        IDBSession DBSession { get; }        T GetById<T>(dynamic primaryId) where T : class;        IEnumerable<T> GetByIds<T>(IList<dynamic> ids) where T : class;        IEnumerable<T> GetAll<T>() where T : class;        int Count<T>(object predicate, bool buffered = false) where T : class;        //lsit        IEnumerable<T> GetList<T>(object predicate = null, IList<ISort> sort = null, bool buffered = false) where T : class;        IEnumerable<T> GetPageList<T>(int pageIndex, int pageSize, out long allRowsCount, object predicate = null, IList<ISort> sort = null, bool buffered = true) where T : class;        dynamic Insert<T>(T entity, IDbTransaction transaction = null) where T : class;        bool InsertBatch<T>(IEnumerable<T> entityList, IDbTransaction transaction = null) where T : class;        bool Update<T>(T entity, IDbTransaction transaction = null) where T : class;        bool UpdateBatch<T>(IEnumerable<T> entityList, IDbTransaction transaction = null) where T : class;        int Delete<T>(dynamic primaryId, IDbTransaction transaction = null) where T : class;        int DeleteList<T>(object predicate, IDbTransaction transaction = null) where T : class;        bool DeleteBatch<T>(IEnumerable<dynamic> ids, IDbTransaction transaction = null) where T : class;    }}

 

 

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现阶段项目还在搭建中,倘若有趣味的同桌也欢迎加入进来,代码详见Github下OSS.Core

近年来项目还在搭建中,若是有趣味的同窗也欢迎参预进来,代码详见Github下OSS.Core

IDataRepository.cs(提供数据层使用,继承了地点的IDataServiceRepository,支持传入sql)

 

 

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=============================

=============================

using System;using System.Collections.Generic;using System.Data;using Dapper;using HY.DataAccess;namespace HY.ORM{    public interface IDataRepository : IDataServiceRepository    {        IDBSession DBSession { get; }                    IEnumerable<T> Get<T>(string sql, dynamic param = null, bool buffered = true) where T : class;        IEnumerable<dynamic> Get(string sql, dynamic param = null, bool buffered = true);        IEnumerable<TReturn> Get<TFirst, TSecond, TReturn>(string sql, Func<TFirst, TSecond, TReturn> map,            dynamic param = null, IDbTransaction transaction = null, bool buffered = true,            string splitOn = "Id", int? commandTimeout = null);         IEnumerable<TReturn> Get<TFirst, TSecond,TThird, TReturn>(string sql, Func<TFirst, TSecond,TThird, TReturn> map,            dynamic param = null, IDbTransaction transaction = null, bool buffered = true,            string splitOn = "Id", int? commandTimeout = null);        SqlMapper.GridReader GetMultiple(string sql, dynamic param = null, IDbTransaction transaction = null,            int? commandTimeout = null, CommandType? commandType = null);         IEnumerable<T> GetPage<T>(int pageIndex, int pageSize, out long allRowsCount, string sql, dynamic param = null, string allRowsCountSql=null,  dynamic allRowsCountParam = null, bool buffered = true) where T : class;              Int32 Execute(string sql, dynamic param = null, IDbTransaction transaction = null);    }}

万一你还有别的难题,欢迎关心群众号(OSSCoder)

只要您还有任何题材,欢迎关心群众号(OSSCoder)

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RepositoryServiceBase.cs(IDataServiceRepository的贯彻类)

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using System.Collections.Generic;using System.Data;using System.Linq;using Dapper;using DapperExtensions;using HY.DataAccess;namespace HY.ORM{    public class RepositoryServiceBase : IDataServiceRepository    {        public RepositoryServiceBase()        {        }        public RepositoryServiceBase(IDBSession dbSession)        {            DBSession = dbSession;        }        public IDBSession DBSession { get; private set; }        public void SetDBSession(IDBSession dbSession)        {            DBSession = dbSession;        }        /// <summary>        /// 根据Id获取实体        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="primaryId"></param>        /// <returns></returns>        public T GetById<T>(dynamic primaryId) where T : class        {            return DBSession.Connection.Get<T>(primaryId as object, databaseType: DBSession.DatabaseType);        }        /// <summary>        /// 根据多个Id获取多个实体        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="ids"></param>        /// <returns></returns>        public IEnumerable<T> GetByIds<T>(IList<dynamic> ids) where T : class        {            var tblName = string.Format("dbo.{0}", typeof;            var idsin = string.Join(",", ids.ToArray<dynamic>;            var sql = "SELECT * FROM @table WHERE Id in ";            IEnumerable<T> dataList = DBSession.Connection.Query<T>(sql, new { table = tblName, ids = idsin });            return dataList;        }        /// <summary>        /// 获取全部数据集合        /// </summary>        /// <typeparam name="T"></typeparam>        /// <returns></returns>        public IEnumerable<T> GetAll<T>() where T : class        {            return DBSession.Connection.GetList<T>(databaseType: DBSession.DatabaseType);        }        /// <summary>        /// 统计记录总数        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="predicate"></param>        /// <param name="buffered"></param>        /// <returns></returns>        public int Count<T>(object predicate, bool buffered = false) where T : class        {            return DBSession.Connection.Count<T>(predicate, databaseType: DBSession.DatabaseType);        }        /// <summary>        /// 查询列表数据        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="predicate"></param>        /// <param name="sort"></param>        /// <param name="buffered"></param>        /// <returns></returns>        public IEnumerable<T> GetList<T>(object predicate = null, IList<ISort> sort = null,            bool buffered = false) where T : class        {            return DBSession.Connection.GetList<T>(predicate, sort, null, null, buffered, databaseType: DBSession.DatabaseType);        }        /// <summary>        /// 分页        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="pageIndex"></param>        /// <param name="pageSize"></param>        /// <param name="allRowsCount"></param>        /// <param name="predicate"></param>        /// <param name="sort"></param>        /// <param name="buffered"></param>        /// <returns></returns>        public IEnumerable<T> GetPageList<T>(int pageIndex, int pageSize, out long allRowsCount,            object predicate = null, IList<ISort> sort = null, bool buffered = true) where T : class        {            if (sort == null)            {                sort = new List<ISort>();            }            IEnumerable<T> entityList = DBSession.Connection.GetPage<T>(predicate, sort, pageIndex, pageSize, null, null, buffered, databaseType: DBSession.DatabaseType);            allRowsCount = DBSession.Connection.Count<T>(predicate, databaseType: DBSession.DatabaseType);            return entityList;        }        /// <summary>        /// 插入单条记录        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="entity"></param>        /// <param name="transaction"></param>        /// <returns></returns>        public dynamic Insert<T>(T entity, IDbTransaction transaction = null) where T : class        {            dynamic result = DBSession.Connection.Insert<T>(entity, transaction, databaseType: DBSession.DatabaseType);            return result;        }        /// <summary>        /// 更新单条记录        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="entity"></param>        /// <param name="transaction"></param>        /// <returns></returns>        public bool Update<T>(T entity, IDbTransaction transaction = null) where T : class        {            bool isOk = DBSession.Connection.Update<T>(entity, transaction, databaseType: DBSession.DatabaseType);            return isOk;        }        /// <summary>        /// 删除单条记录        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="primaryId"></param>        /// <param name="transaction"></param>        /// <returns></returns>        public int Delete<T>(dynamic primaryId, IDbTransaction transaction = null) where T : class        {            var entity = GetById<T>(primaryId);            var obj = entity as T;            int isOk = DBSession.Connection.Delete<T>(obj, databaseType: DBSession.DatabaseType);            return isOk;        }        /// <summary>        /// 删除单条记录        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="predicate"></param>        /// <param name="transaction"></param>        /// <returns></returns>         public int DeleteList<T>(object predicate = null, IDbTransaction transaction = null) where T : class        {            return DBSession.Connection.Delete<T>(predicate, transaction, databaseType: DBSession.DatabaseType);        }        /// <summary>        /// 批量插入功能        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="entityList"></param>        /// <param name="transaction"></param>        public bool InsertBatch<T>(IEnumerable<T> entityList, IDbTransaction transaction = null) where T : class        {            bool isOk = false;            foreach (var item in entityList)            {                Insert<T>(item, transaction);            }            isOk = true;            return isOk;        }        /// <summary>        /// 批量更新()        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="entityList"></param>        /// <param name="transaction"></param>        /// <returns></returns>        public bool UpdateBatch<T>(IEnumerable<T> entityList, IDbTransaction transaction = null) where T : class        {            bool isOk = false;            foreach (var item in entityList)            {                Update<T>(item, transaction);            }            isOk = true;            return isOk;        }        /// <summary>        /// 批量删除        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="ids"></param>        /// <param name="transaction"></param>        /// <returns></returns>        public bool DeleteBatch<T>(IEnumerable<dynamic> ids, IDbTransaction transaction = null) where T : class        {            bool isOk = false;            foreach (var id in ids)            {                Delete<T>(id, transaction);            }            isOk = true;            return isOk;        }    }}

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RepositoryBase.cs(IDataRepository的完毕类)

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using System;using System.Collections.Generic;using System.Data;using Dapper;using DapperExtensions;using HY.DataAccess;namespace HY.ORM{    /// <summary>    /// Repository基类    /// </summary>    public class RepositoryBase : RepositoryServiceBase, IDataRepository    {        public RepositoryBase()        {        }        public new void SetDBSession(IDBSession dbSession)        {            base.SetDBSession(dbSession);        }        public RepositoryBase(IDBSession dbSession)            : base(dbSession)        {        }        /// <summary>        /// 根据条件筛选出数据集合        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="sql"></param>        /// <param name="param"></param>        /// <param name="buffered"></param>        /// <returns></returns>        public IEnumerable<T> Get<T>(string sql, dynamic param = null, bool buffered = true) where T : class        {            return DBSession.Connection.Query<T>(sql, param as object, DBSession.Transaction, buffered);        }        /// <summary>        /// 根据条件筛选数据集合        /// </summary>        /// <param name="sql"></param>        /// <param name="param"></param>        /// <param name="buffered"></param>        /// <returns></returns>        public IEnumerable<dynamic> Get(string sql, dynamic param = null, bool buffered = true)        {            return DBSession.Connection.Query(sql, param as object, DBSession.Transaction, buffered);        }        /// <summary>        /// 分页查询        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="pageIndex"></param>        /// <param name="pageSize"></param>        /// <param name="allRowsCount"></param>        /// <param name="sql"></param>        /// <param name="param"></param>        /// <param name="allRowsCountSql"></param>        /// <param name="allRowsCountParam"></param>        /// <param name="buffered"></param>        /// <returns></returns>        public IEnumerable<T> GetPage<T>(int pageIndex, int pageSize, out long allRowsCount, string sql, dynamic param = null, string allRowsCountSql = null, dynamic allRowsCountParam = null, bool buffered = true) where T : class        {            IEnumerable<T> entityList = DBSession.Connection.GetPage<T>(pageIndex, pageSize, out allRowsCount, sql, param as object, allRowsCountSql, null, null, buffered, databaseType: DBSession.DatabaseType);            return entityList;        }        /// <summary>        /// 根据表达式筛选        /// </summary>        /// <typeparam name="TFirst"></typeparam>        /// <typeparam name="TSecond"></typeparam>        /// <typeparam name="TReturn"></typeparam>        /// <param name="sql"></param>        /// <param name="map"></param>        /// <param name="param"></param>        /// <param name="transaction"></param>        /// <param name="buffered"></param>        /// <param name="splitOn"></param>        /// <param name="commandTimeout"></param>        /// <returns></returns>        public IEnumerable<TReturn> Get<TFirst, TSecond, TReturn>(string sql, Func<TFirst, TSecond, TReturn> map,            dynamic param = null, IDbTransaction transaction = null, bool buffered = true, string splitOn = "Id",            int? commandTimeout = null)        {            return DBSession.Connection.Query(sql, map, param as object, transaction, buffered, splitOn);        }        /// <summary>        /// 根据表达式筛选        /// </summary>        /// <typeparam name="TFirst"></typeparam>        /// <typeparam name="TSecond"></typeparam>        /// <typeparam name="TReturn"></typeparam>        /// <param name="sql"></param>        /// <param name="map"></param>        /// <param name="param"></param>        /// <param name="transaction"></param>        /// <param name="buffered"></param>        /// <param name="splitOn"></param>        /// <param name="commandTimeout"></param>        /// <returns></returns>        public IEnumerable<TReturn> Get<TFirst, TSecond, TThird, TReturn>(string sql, Func<TFirst, TSecond, TThird, TReturn> map,            dynamic param = null, IDbTransaction transaction = null, bool buffered = true, string splitOn = "Id",            int? commandTimeout = null)        {            return DBSession.Connection.Query(sql, map, param as object, transaction, buffered, splitOn);        }        /// <summary>        /// 获取多实体集合        /// </summary>        /// <param name="sql"></param>        /// <param name="param"></param>        /// <param name="transaction"></param>        /// <param name="commandTimeout"></param>        /// <param name="commandType"></param>        /// <returns></returns>        public SqlMapper.GridReader GetMultiple(string sql, dynamic param = null, IDbTransaction transaction = null,            int? commandTimeout = null, CommandType? commandType = null)        {            return DBSession.Connection.QueryMultiple(sql, param as object, transaction, commandTimeout, commandType);        }        /// <summary>        /// 执行sql操作        /// </summary>        /// <param name="sql"></param>        /// <param name="param"></param>        /// <returns></returns>        public int Execute(string sql, dynamic param = null, IDbTransaction transaction = null)        {            return DBSession.Connection.Execute(sql, param as object, transaction);        }    }}

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说起DapperExtensions修改的小地方还蛮多的,下图是三个代码比较的截图。所以一会把代码打包贴上来吧。

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上述代码就足以编写翻译成 HY.ORM.DLL文件了。

下边就能够在 本身业务层继承HY.O福特ExplorerM中的RepositoryServiceBase类
,数据层继承HY.O科雷傲M中的 RepositoryBase类。

经过独家的构造函数也许,SetDBSession(Helper.CreateDBSession;
进行数量连接开头化。

接下去配置实体类和DB的映照:

    public class DemoEntity    {                public int ID { get; set; }        public string Name { get; set; }    }    [Serializable]    public class DomoEntityORMMapper : ClassMapper<DemoEntity>    {        public DomoEntityORMMapper()        {            base.Table("Demo");            //Map(f => f.UserID).Ignore();//设置忽略            //Map(f => f.Name).Key(KeyType.Identity);//设置主键  (如果主键名称不包含字母“ID”,请设置)                       AutoMap();        }    }

那般就足以在类中 完毕 this.Get<DemoEntity>(“select * from 德姆o
where ID=@ID”, new { ID = 1 }); 那样的语法了。

现实的应用方发

下图是本人要介绍完毕的体系截图:

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实质上也是三层,只是名字不平等而已。

HY.Web

HY.Web.Iservice

HY.Web.Service(服务层,HY.Web.Iservice的兑现类,
你也足以通晓为业务逻辑层BLL)

HY.Web.DAO(数据访问层, 你也足以清楚为DAL)

HY.Web.Entity(实体层, 近期只定义了数额实体,
假诺你的种类要求给app提供数据,
那么传输的数码要言必有中,就供给单独定义DTO了。 )

就那用户表来做个实例吧,表结构如下:(下图是用代码生成器截图效果,可以直接修改数据库的讲述新闻,开发利器。须求的心上人点那里【CodeBuilder-RazorEngine】)

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HY.Web.Entity

在HY.Web.Entity的连串中新建Sys_UsersEntity.cs 定义实体类

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HY.Web.DAO

概念基类 BaseRepository.cs (能够安装暗中认可的DBsession,方便扩张此外东东)

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Code

定义数据访问层 Sys_UsersRepository.cs (代码里能够打包任何索要写sql
的代码)

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Code

HY.Web.IService

概念接口 ISys_UsersService.cs ,提供给UI访问。

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Code

HY.Web.Service

定义BaseService.cs,(能够设置默许的DBsession,方便扩充其余东东)

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Code

定义Sys_UsersService.cs, 去实现ISys_UsersService。

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Code

HY.Web

① 、定义相关的Controller

2、ISys_UsersService iSys_UsersService = new Sys_UsersService();
(那块其实能够应用 IoC, 相关内容且听后续分解)

三 、调用接口

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Code

**下载:**

HY.DataAccess

修改后的DapperExtensions:Dapperextensions.RAR

ps:已经更新版本了, 参预了对lambda的恢弘,点击那里进入

连带小说:

搭建一套自身实用的.net架构

搭建一套本人实用的.net架构【日志模块-log4net】

搭建一套自个儿实用的.net框架结构【O福睿斯M-Dapper+DapperExtensions】

搭建一套自个儿实用的.net架构续 【ORAV4M Dapper+DapperExtensions+Lambda】

搭建一套本人实用的.net架构【CodeBuilder-RazorEngine】

原稿链接:

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