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搭建一套自己实用的.net架构(3)【ORM-Dapper+DapperExtensions】

作者：佚名 ASP.NET网站开发编辑：admin 更新时间：2022-07-23

现在成熟的ORM比比皆是，这里只介绍Dapper的使用（最起码我在使用它，已经运用到项目中，小伙伴们反馈还可以）。

优点：

1、开源、轻量、小巧、上手容易。

2、支持的数据库还蛮多的， MySQL,SqlLite,Sqlserver,Oracle等一系列的数据库。

3、Dapper原理通过Emit反射IDataReader的序列队列来快速的得到和产生对象。性能貌似很牛逼的样子

缺点：

作为一款ORM太过于轻量级了，根据对象自动生成sql的功能还是空白，需要自己来扩展，

当然这也是优点，好声音的导师们经常说某人就是张白纸……

因此针对Dapper已经有很多成熟的扩展项目了，Dapper.Rainbow、Dapper.Contrib，DapperExtensions。

我们这里介绍的是DapperExtensions。

dapper-dot-net源码：https://github.com/StackExchange/dapper-dot-net （更新频率快，项目包含了各种除了Dapper-Extensions的扩展项目）

Dapper-Extensions 源码：https://github.com/tmsmith/Dapper-Extensions

Dapper-Extensions的优点：

1、开源

2、针对Dapper封装了常用的CRUD方法，有独立的查询语法。

3、需要映射的实体类本身0配置，无需加特性什么的。是通过独立的映射类来处理，可以设置类映射到DB的别名，字段的别名等等。

Dapper-Extensions的缺点：

1、好几年没更新了

2、不支持oracle（木有oracle的方言，已经搞定）

3、不能同时支持多种数据库（已经搞定）

4、部分代码有些bug（发现的都搞定了）

下面先简单介绍一下Dapper的基本语法。

Dapper就一个.cs文件，可以放到项目代码中直接编译，也可以直接引用DLL文件。

Dapper对DB的操作依赖于Connection，为了支持多库，咱们用 IDbConnection conn

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

下面是带参数的语法

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});
                        
    }

各种方法都重载了事务的操作，一般的数据库操作都支持。但是每次执行都需要传递sql，而且每次都要使用Using，看着不爽啊，这……

好吧下面简单介绍下使用Dapper-Extensions的基本语法（在Dapper-Extensions 的基础上用了Repository模式，代码效果如下）。

            //实体类
            DemoEntity entity = new DemoEntity();

            //根据实体主键删除
            this.Delete<DemoEntity>(entity);

            //根据主键ID删除
            this.Delete<DemoEntity>(1);

            //增加
            this.Insert<DemoEntity>(entity);

            //更新
            bool result = this.Update<DemoEntity>(entity);

            //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);

在说ORM之前，还是要说一下HY.Dataaccess这个模块

这个模块是对数据访问提供的一个Helper的功能，里面包含了各种DB的SqlHelper，分页。

DBHelper 都继承自IDBHelper.cs

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



    }
}

View Code

IDBsession.cs 对数据访问对象的定义

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();
    }
}

View Code

SqlConnectionFactory.cs 这个类是采用工厂模式创建DB连接的封装，代码如下：

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 (dbType)
            {
                case DatabaseType.SqlServer:
                    connection = new System.Data.SqlClient.SqlConnection(strConn);
                    break;
                case DatabaseType.MySql:
                    //connection = new MySql.Data.MySqlClient.MySqlConnection(strConn);
                    //break;
                case DatabaseType.Oracle:
                    //connection = new Oracle.DataAccess.Client.OracleConnection(strConn);
                    connection = new System.Data.OracleClient.OracleConnection(strConn);
                    break;
                case DatabaseType.DB2:
                    connection = new System.Data.OleDb.OleDbConnection(strConn);
                    break;
            }
            return connection;
        }
    }
}

View Code

ORM也不是万能的，比如做大数据的批量插入什么的，还是需要SqlHelper，加上有的人就喜欢DataTable或者DataSet。

所以SqlHelper作为根基，ORM作为辅助，万无一失啊。

下面说说ORM这块的实现方式。见下截图

IDataServiceRepository.cs（提供业务层使用，里面的方法不支持传递sql，包含sql的语句最好还是放在数据层操作的好）

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;
    }
}

View Code

IDataRepository.cs（提供数据层使用，继承了上面的IDataServiceRepository，支持传入sql）

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);


    }
}

View Code

RepositoryServiceBase.cs（IDataServiceRepository的实现类）

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(T).Name);
            var idsin = string.Join(",", ids.ToArray<dynamic>());
            var sql = "SELECT * FROM @table WHERE Id in (@ids)";
            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;
        }

    }
}

View Code

RepositoryBase.cs（IDataRepository的实现类）

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);
        }


    }
}

View Code

说起DapperExtensions修改的小地方还蛮多的，下图是一个代码比较的截图。所以一会把代码打包贴上来吧（见文章结尾）。

上述代码就可以编译成 HY.ORM.DLL文件了。

下面就可以在自己业务层继承HY.ORM中的RepositoryServiceBase类，数据层继承HY.ORM中的 RepositoryBase类。

通过各自的构造函数或者， SetDBSession(Helper.CreateDBSession()); 进行数据连接初始化。

接下来配置实体类和DB的映射：

    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();
        }
    }

这样就可以在类中实现 this.Get<DemoEntity>("select * from Demo where ID=@ID", new { ID = 1 }); 这样的语法了。

具体的使用方发

下图是我要介绍实现的项目截图：

其实也是三层，只是名字不一样而已。

HY.Web( UI层，MVC)

HY.Web.Iservice( 服务接口层)

HY.Web.Service（服务层，HY.Web.Iservice的实现类，你也可以理解为业务逻辑层BLL）

HY.Web.DAO（数据访问层，你也可以理解为DAL）

HY.Web.Entity(实体层，目前只定义了数据实体，如果你的系统需要给app提供数据，那么传输的数据要精简，就需要单独定义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描述信息，开发利器。需要的朋友点这里【CodeBuilder-RazorEngine】）

HY.Web.Entity

在HY.Web.Entity的项目中新建Sys_UsersEntity.cs 定义实体类

View Code

HY.Web.DAO

定义基类 BaseRepository.cs （可以设置默认的DBsession，方便扩展其它东东）

View Code

定义数据访问层 Sys_UsersRepository.cs （代码里可以封装任何需要写sql 的代码）

View Code

HY.Web.IService

定义接口 ISys_Usersservice.cs ，提供给UI访问。

View Code

HY.Web.Service

定义BaseService.cs，（可以设置默认的DBsession，方便扩展其它东东）

View Code

定义Sys_UsersService.cs，去实现ISys_UsersService。

View Code

HY.Web

1、定义相关的Controller

2、ISys_UsersService iSys_UsersService = new Sys_UsersService(); （这块其实可以使用 IoC，相关内容且听后续分解）

3、调用接口

View Code

下载:

HY.DataAccess

修改后的DapperExtensions：Dapperextensions.RAR

搭建一套自己实用的.net架构(1)【概述】

搭建一套自己实用的.net架构(2)【日志模块-log4net】

搭建一套自己实用的.net架构(3)【ORM-Dapper+DapperExtensions】

搭建一套自己实用的.net架构(4)【CodeBuilder-RazorEngine】

原文链接：http://www.cnblogs.com/hy59005271/p/4759623.html

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搭建一套自己实用的.net架构(3)【ORM-Dapper+DapperExtensions】

具体的使用方发

HY.Web.Entity

HY.Web.DAO

HY.Web.IService

HY.Web.Service

HY.Web

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