搭建一套自己实用的.net架构(3)【ORM-Dapper+Dap…
2018-06-18 04:48:07来源:未知 阅读 ()
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 } }
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(); } }
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; } } }
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; } }
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); } }
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; } } }
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); } } }
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
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)
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)
HY.Web.IService
定义接口 ISys_UsersService.cs ,提供给UI访问。
HY.Web.Service
定义BaseService.cs,(可以设置默认的DBsession,方便扩展其它东东)
定义Sys_UsersService.cs, 去实现ISys_UsersService。
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
下载:
HY.DataAccess
修改后的DapperExtensions:Dapperextensions.RAR
ps:已经更新版本了, 加入了对lambda的扩展,点击这里进入
相关文章:
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(3)续 【ORM Dapper+DapperExtensions+Lambda】
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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