<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<!--namespace对应mapper接口所在的位置-->
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<mapper namespace="com.dy.pipIrrGlobal.daoDemo.DemoUserMapper">
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<resultMap id="userMap" type="com.dy.pipIrrGlobal.pojoDemo.DemoUser">
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<id property="id" column="id" />
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<result property="name" column="name"/>
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<result property="password" column="password"/>
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<result property="roleId" column="roleId"/>
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<result property="disabled" column="disabled" typeHandler="com.dy.common.mybatis.envm.EnumCodeTypeHandler" javaType="com.dy.common.mybatis.envm.Disabled"/>
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<result property="deleted" column="deleted" typeHandler="com.dy.common.mybatis.envm.EnumCodeTypeHandler" javaType="com.dy.common.mybatis.envm.Deleted"/>
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</resultMap>
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<resultMap id="addressMap" type="com.dy.pipIrrGlobal.pojoDemo.DemoAddress">
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<id property="id" column="id" />
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<result property="name" column="name"/>
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<result property="userId" column="userId"/>
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</resultMap>
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<resultMap id="userAddressMap1" extends="userMap" type="com.dy.pipIrrGlobal.pojoDemo.DemoUser">
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<association property="address" columnPrefix="addr_" resultMap="addressMap" />
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</resultMap>
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<resultMap id="userAddressMap2" extends="userMap" type="com.dy.pipIrrGlobal.pojoDemo.DemoUser">
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<association property="address" columnPrefix="addr_" resultMap="com.dy.pipIrrGlobal.daoDemo.DemoAddressMapper.addressMap" />
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</resultMap>
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<resultMap id="userAddressMap3" extends="userMap" type="com.dy.pipIrrGlobal.pojoDemo.DemoUser">
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<association property="address" column="{userId=id}" select="com.dy.pipIrrGlobal.daoDemo.DemoAddressMapper.selectByUserId" />
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</resultMap>
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<!-- fetchType="lazy" 还需要配置aggressiveLazyLoading=false -->
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<resultMap id="userAddressMap4" extends="userMap" type="com.dy.pipIrrGlobal.pojoDemo.DemoUser">
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<association property="address" fetchType="lazy" column="{userId=id}" select="com.dy.pipIrrGlobal.daoDemo.DemoAddressMapper.selectByUserId" />
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</resultMap>
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<!-- 关联的嵌套结果映射，优点：数据库查询次数少，压力小，缺点：SQL复杂 -->
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<select id="selectById1" resultType="com.dy.pipIrrGlobal.pojoDemo.DemoUser">
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select u.*,
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adr.id "address.id",
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adr.name "address.name",
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adr.userId "address.userId"
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from demo_user u
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inner join demo_address adr on u.id = adr.userId
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where u.id = #{id}
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</select>
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<!-- 关联的嵌套结果映射，优点：数据库查询次数少，压力小，缺点：SQL复杂 -->
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<select id="selectById2" resultMap="userAddressMap1">
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select u.*,
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adr.id addr_id,
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adr.name addr_name,
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adr.userId addr_userId
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from demo_user u
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inner join demo_address adr on u.id = adr.userId
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where u.id = #{id}
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</select>
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<!-- 关联的嵌套结果映射，优点：数据库查询次数少，压力小，缺点：SQL复杂 -->
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<select id="selectById3" resultMap="userAddressMap2">
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select u.*,
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adr.id addr_id,
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adr.name addr_name,
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adr.userId addr_userId
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from demo_user u
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inner join demo_address adr on u.id = adr.userId
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where u.id = #{id}
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</select>
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<!-- 关联嵌套查询，优点：SQL简单，缺点：数据库可能查询多次数，压力大， -->
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<select id="selectById4" resultMap="userAddressMap3">
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select u.*
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from demo_user u
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where u.id = #{id}
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</select>
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<!-- 关联嵌套查询，优点：SQL简单，缺点：数据库可能查询多次数，压力大， -->
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<select id="selectById5" resultMap="userAddressMap4">
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select u.*
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from demo_user u
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where u.id = #{id}
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</select>
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<!-- 第三方关联查询 -->
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<select id="selectByRoleId" resultMap="userAddressMap4">
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select * from demo_user where roleId=#{roleId}
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</select>
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<!--对应mapper接口方法public void insert(DemoUser user);-->
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<insert id="putin" parameterType="com.dy.pipIrrGlobal.pojoDemo.DemoUser">
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insert into
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demo_user (id, name, password, roleId, disabled, deleted)
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values (#{id},#{name},#{password},#{roleId},
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#{disabled, typeHandler=com.dy.common.mybatis.envm.EnumCodeTypeHandler, jdbcType=TINYINT},
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#{deleted, typeHandler=com.dy.common.mybatis.envm.EnumCodeTypeHandler, jdbcType=TINYINT}
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);
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</insert>
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</mapper>
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