1.抽取之前的UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.hao.mapper.UserMapper"><select id="findByCondition" parameterType="user" resultType="user">select * from user<where><if test="id!=0">and id=#{id}</if><if test="username!=null">and username=#{username}</if><if test="password!=null">and password=#{password}</if></where></select><select id="findByIds" parameterType="list" resultType="user">select * from user<where><foreach collection="list" open="id in(" close=")" item="id" separator=",">#{id}</foreach></where></select> </mapper>

2.抽取之后的UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.hao.mapper.UserMapper"> <!-- sql語句的抽取--><sql id="selectUser">select * from user</sql><select id="findByCondition" parameterType="user" resultType="user"><include refid="selectUser"></include><where><if test="id!=0">and id=#{id}</if><if test="username!=null">and username=#{username}</if><if test="password!=null">and password=#{password}</if></where></select><select id="findByIds" parameterType="list" resultType="user"><include refid="selectUser"></include><where><foreach collection="list" open="id in(" close=")" item="id" separator=",">#{id}</foreach></where></select> </mapper>

refid：引用

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