Mybatis-typeAliases的作用

其他具体代码请访问-》mybatis的快速入门

1.在mybatis核心配置文件SqlMapperConfig.xml中配置别名

<!--    定义别名-->
    <typeAliases>
        <typeAlias type="com.hao.domain.User" alias="user"/>
    </typeAliases>

2.UserMapper.xml中的parameterType就不用再写User类的全限定名

<?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="userMapper">
    <select id="findAll" resultType="user"><!--resultType意思是将查询的结果封装到哪个实体类中 -->
        select * from user
    </select>
<!--    插入操作-->
    <insert id="save" parameterType="user">
        insert into user values(#{id},#{username},#{password})
    </insert>
<!--    更新操作-->
    <update id="update" parameterType="user">
        update user set username=#{username},password=#{password} where id=#{id}
    </update>
<!--    删除操作-->
    <delete id="delete" parameterType="int">
        delete from user  where id=#{id}
    </delete>
</mapper>