Chat/src/main/resources/mapper/MessageMapper.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="dao.chat.Message">
    <select id="getMessage" resultType="com.example.chat.entity.chat.Message">
        select *
        from message
    </select>

    <insert id="addMessage" parameterType="com.example.chat.entity.chat.Message">
        insert into message (nickname, pic, sendTime, message)
        values (#{nickname}, #{pic}, #{sendTime}, #{message})
    </insert>

    <update id="updateHead" parameterType="com.example.chat.entity.chat.Message">
        update message
        set and pic = #{pic}
        where nickname = #{nickname}
    </update>

</mapper>