配置别名

在mybatis核心配置文件中,配置别名标签,注意标签的顺序,一般要放在properties,setting之后

<!--自定义别名-->
<typeAliases>
    <typeAlias type="com.itheibai.entity.User" alias="user"></typeAlias>
</typeAliases>

可配置多个,配置完别名后,可将UserMapper.xml文件中的限定名,修改为别名

<?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">
    <!--查询用户-->
    <select id="findAll" resultType="user">
        select * from user
    </select>
    <!--插入用户-->
    <insert id="save" parameterType="user">
        insert into user values (#{id},#{username},#{password})
    </insert>
    <!--更新用户-->
    <update id="updateById" parameterType="user">
        update user set username=#{username},password=#{password} where id=#{id}
    </update>
    <!--删除用户-->
    <delete id="deleteById" parameterType="Integer">
        delete from user where id=#{id}
    </delete>
</mapper>