idea mybatis cannot find xml以及一些注意事项

映射文件和java工程在一起，sqlmapconfig.xml在maven webapp中的resources，但编译运行却报exception cannot find 映射文件，查看编译后的文件发现即target中没有Dept.xml解决办法

只需要在pom中加入

     mybatis-base

    

      

         src/main/java

        

           **/*.xml

        

      

    

  
即可，意思是加载编译在java工程中的xml映射文件

但在sqlmapconfig中mapper即映射路径需要这样写，以斜杠分割

configuration
        PUBLIC "-//mybatis.org//DTDConfig 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">

<mappers>
   <mapper resource="com/lz/mybat/User.xml"/>
mappers>

但在映射配置中

xml version="1.0" encoding="UTF-8" ?>
mapper
        PUBLIC "-//mybatis.org//DTDConfig 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="test">
    <select id="findUserById" parameterType="int" resultType="com.lzq.mybat.User">
        SELECT * FROM USER WHERE id=#{id}
    select>
mapper>

resulttype中路径是。分割，之所以是不同是因为，前者是路径以/分割，后者是类型即返回值类型pojo包类名

configuration
        PUBLIC "-//mybatis.org//DTDConfig 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">

sqlmapconfig 为config.dtd

映射为 mapper.dtd

 

    <select id="findUserByName" parameterType="java.lang.String" resultType="com.lzq.mybat.User">
        SELECT * FROM user WHERE username like #{value}
    select>

User user = sqlSession.selectOne("test.findUserById", 1);
//        参数一，映射文件中的 namespace+.+selectid,展位副值

SELECT * FROM user WHERE username LIKE '%${value}%'

${}表示拼接符用来模糊查询之类的，需加引号，但会引起sql注入

<insert id="insertUser" parameterType="com.lzq.mybat.User">
    <selectKey keyProperty="id" order="AFTER" resultType="java.lang.Integer">
      SELECT last_insert_id()
    selectKey>
    INSERT INTO user(id,username,birthday,sex,address) value(#{id},#{username},#{birthday},#{sex},#{address})
insert>


<insert id="insertUser" parameterType="com.lzq.mybat.User">
    <selectKey keyProperty="id" order="BEFORE" resultType="java.lang.Integer">
        SELECT uuid()
    selectKey>
    INSERT INTO user(id,username,birthday,sex,address) value(#{id},#{username},#{birthday},#{sex},#{address})

insert>

<typeAliases>
    
    
    
    <package name="com.lzq.mybat"/>
    <package name="com.lzq.mapper"/>
    <package name="com.lzq.dao"/>
typeAliases>

<mapper class="com.lzq.mapper.UserMapper"/>


<package name="com.lzq.mapper"/>

<select id="findUserList" parameterType="com.lzq.dao.UserQueryVo" resultType="com.lzq.dao.UserExpand">
    SELECT *
    FROM user
    WHERE user.id = #{userExpand.sex} AND user.username LIKE '%${userExpand.user}%'
select>