IBatis.net介绍

IBatis.net 是2001年发起的开源项目,它是一个轻量级的ORM框架,现在IBatisNET已经是属于Apache下的一个子项目了,最新版本是1.6.2.

官方网站:http://www.mybatis.org/

.net项目下载地址:http://code.google.com/p/mybatisnet/

DataMapper:通过配置映射关系的xml业务对象与SQL语句和存储过程进行映射.

DataAcces:简单的说就是IBatis的数据访问层.

IBatis.net配置

主要要用到的几个配置文件:

providers.config 这个直接拷贝到根目录,该文件定义各种数据库的驱动,包括SqlServer, Oracle, MySQL, PostgreSQL, DB2 and OLEDB, ODBC 等。

sqlmap.config 就是非常核心的一个配置文件，主要配置了数据库访问字符串,settings设置,以及配置实体类和数据库表相关xml。

还有一个database.config 文件，它是配置一些在sqlmap中用到得参数.

然后需要引入两个DLL文件.

sqlmap.config文件代码:

<?xml version="1.0" encoding="utf-8"?>

<sqlMapConfig xmlns="http://ibatis.apache.org/dataMapper" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

  <!--<providers resource="database.config" />-->

  <settings>

    <setting useStatementNamespaces="true"/>

    <setting cacheModelsEnabled="true"/>

  </settings>

  <providers resource="providers.config" />

  <database>

    <!-- Optional ( default ) -->

    <provider name="sqlServer2.0"/>

    <dataSource name="iBatisNet" connectionString="Server=.; User ID=sa;Password=sa;Database=TestDB;Persist Security Info=True"/>

    </database>

  <sqlMaps>

    <sqlMap resource="Maps/Account.xml"/>

  </sqlMaps>

</sqlMapConfig>

useStatementNamespaces:是否启用命名空间

cacheModelsEnabled:是否缓存数据

<providers resource="providers.config" /> 引入数据库驱动文件

sqlMaps 节点就是配置一些sql语句以及实体映射的xml文件.

IBatis.net实战

现在让我们来做一个Demo

我用的是Sqlserver2005 ,新建一个数据表

在Vs2010下新建项目IBatisDemo

项目结构如下

IBatisDemo.Dao 提供一个统一的Mapper访问接口,

IBatisDemo.Model 数据实体

IBatisDemo.Service 数据操作

因为是做Demo没有对整体架构做过多的细节设置.

首先配置网站根目录下的Maps/Account.xml如下：

<?xml version="1.0" encoding="utf-8" ?>

<sqlMap namespace="Account" xmlns="http://ibatis.apache.org/mapping" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

  <alias>

    <!-- alias:取别名

                    assembly:表示类所在的文件

                    type:表示该类的完整的名称

-->

    <typeAlias alias="Account" assembly="IBatisDemo.Model.dll" type="IBatisDemo.Model.Accounts" />

  </alias>

  <resultMaps>

    <resultMap id="Account-result"  class="Account">

      <result property="Id"    column="id"/>

      <result property="Item"    column="Item"/>

      <result property="Year"    column="Year"/>

      <result property="Month"    column="Month"/>

      <result property="Day"    column="Day"/>

      <result property="CreateOn"    column="CreateOn"/>

      <result property="Level"    column="Level"/>

    </resultMap>

  </resultMaps>

  <statements>

    <select id="sql_selectByid" resultMap="Account-result">

      select * from Accounts

      <dynamic prepend="where">

        <isParameterPresent property="id" prepend="">

          [id] = #id#

        </isParameterPresent>

      </dynamic>

    </select>

    <select id="sql_selectAll" resultMap="Account-result">

      select * from Accounts

    </select>

    <insert id="sql_InsertOne" parameterClass="Account">

      insert into Accounts (Item,Money,Year,Month,Day,CreateOn,Level)

      values

      (#Item#,

      #Money#,

      #Year#,

      #Month#,

      #Day#,

      #CreateOn#,

      #Level#

      <selectKey  type="post" resultClass="int" property="Id">

        SELECT CAST(@@IDENTITY as int) as Id

      </selectKey>

    </insert>

  </statements>

</sqlMap>

说明:

statements 节点：

在这些容器标签中有一些常用的属性如下所示

resultMap和resultclass对比:

1、resultMap属于直接映射，可以把结果集中的数据库字段与实体类中的属性一一对应，这样通过select语句得到的结果就会准确的对上号

2、resultclass属于隐身映射，虽然你指定resultclass=“”，具体某一个类，但是select语句得到的结果是一条实力记录，但如果数据库字段与类的属性名字不一致，这个时候就会出现映射错误，有一种方式可以解决就是在写select语句时，给每个字段用as运算符取名字与属性一样：例如：select realname as name...其中realname是字段列名，name是属性字段名

3、resultmap比resultclass性能要高。尽量使用resultmap

insert标签下的selectKey 是表示返回刚插入数据的主键id，具体说明如下

<!-- 为了使insert操作能够返回插入记录的id，必须为insert写一个selectKey –>

<!-- 下面是sqlserver写法-->

    <selectKey  type="post" resultClass="int" property="Id">

      SELECT CAST(@@IDENTITY as int) as Id

    </selectKey>

<!--

    下面是针对Oracle的写法,Oracle没有autoincrement，而是用触发器实现的

    CURRVAL是在触发器中定义的

-->

<!--<insert id="insertRemark" parameterClass="RemarkInfo">

    insert into SGS_REMARK(REMARK) values(#remark#)

    <selectKey resultClass="int" keyProperty="id" >

     SELECT S_SGS_REMARK.CURRVAL AS ID FROM DUAL

    </selectKey>

</insert>

-->

<!-- 下面是针对MySQL的写法 -->

<!--

    <selectKey resultClass="int" keyProperty="id" >

    SELECT @@IDENTITY AS id

    </selectKey> -->

Account.xml配置完成 .建实体类:

using System;

using System.Collections.Generic;

using System.Text;

namespace IBatisDemo.Model

    public class Accounts

        public int Id { get; set; }

        public string Item { get; set; }

        public float Money { get; set; }

        public int Month { get; set; }

        public int Year { get; set; }

        public int Day { get; set; }

        public DateTime CreateOn { get; set; }

        public string Level { get; set; }

Mapper.cs 获取Mapper的对象类:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using IBatisNet.DataMapper;

using IBatisNet.Common.Utilities;

using IBatisNet.DataMapper.Configuration;

namespace IBatisDemo.Dao

    public class Mapper

        private static volatile ISqlMapper _mapper = null;

        protected static void Configure(object obj)

            _mapper = null;

        protected static void InitMapper()

            ConfigureHandler handler = new ConfigureHandler(Configure);

            DomSqlMapBuilder builder = new DomSqlMapBuilder();

            _mapper = builder.ConfigureAndWatch(handler);

        public static ISqlMapper Instance()

            if (_mapper == null)

                lock (typeof(SqlMapper))

                    if (_mapper == null) // double-check

                        InitMapper();

            return _mapper;

        public static ISqlMapper Get()

            return Instance();

        /// <summary>

        /// RealMarket Mapper

        /// </summary>

        public static ISqlMapper GetMaper

get

                if (_mapper == null)

                    lock (typeof(ISqlMapper))

                        if (_mapper == null)

                            ConfigureHandler hander = new ConfigureHandler(Configure);

                            DomSqlMapBuilder builder = new DomSqlMapBuilder();

                            _mapper = builder.ConfigureAndWatch("sqlmap.config", hander);

                return _mapper;

然后再Service里面建立AccountService.cs 数据访问

using System;

using System.Collections.Generic;

using System.Text;

using System.Reflection;

using System.IO;

using IBatisDemo.Model;

using System.Data.SqlClient;

using IBatisDemo.Dao;

namespace IBatisDemo.Service

    public class AccountService

        public int TestInsertOne(Accounts account)

            Object obj =Mapper.GetMaper.Insert("Account.sql_InsertOne", account);

            return (int)obj;

        public Accounts GetAccount(int id)

            return (Accounts)Mapper.GetMaper.QueryForObject("Account.sql_selectByid", id);

        public IList<Accounts> GetAccountList()

            return Mapper.GetMaper.QueryForList<Accounts>("Account.sql_selectAll", null);

这里要注意命名空间.

在Default.aspx页面上调用Service

protected void Button1_Click(object sender, EventArgs e)

          Accounts account = new Accounts();

          account.Id =-1;

          account.CreateOn = DateTime.Now;

          account.Day = 12;

          account.Item = "小刚1";

          account.Level = "无";

          account.Money = 56;

          account.Month = 6;

          account.Year = 2011;

          AccountService service = new AccountService();

          service.TestInsertOne(account);

      protected void Button3_Click(object sender, EventArgs e)

          AccountService service = new AccountService();

          IList<Accounts> accounts = service.GetAccountList();

          this.GridView1.DataSource = accounts;

          this.GridView1.DataBind();

      protected void Button2_Click(object sender, EventArgs e)

          AccountService service = new AccountService();

          Accounts account = service.GetAccount(2);

运行效果: