Admin.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.example.springboot.mapper.AdminMapper">

    <insert id="save">
        insert into admin(username, password, phone, email)
        values(#{username}, #{password}, #{phone}, #{email})
    </insert>

    <update id="updateById">
        update admin set username = #{username}, phone = #{phone}, email = #{email}, updatetime = #{updatetime}, status = #{status} where id = #{id}
    </update>

    <update id="updatePassword">
        update admin set password = #{newPass} where username = #{username} and password = #{password}
    </update>

    <delete id="deleteById">
        delete from admin where id = #{id}
    </delete>

    <select id="list" resultType="com.example.springboot.entity.Admin">
        select * from admin order by id desc
    </select>

    <select id="listByCondition" resultType="com.example.springboot.entity.Admin">
        select * from admin
            <where>
                <if test="username != null and username != ''">
                    username like concat('%', #{ username }, '%')
                </if>
                <if test="phone != null and phone != ''">
                    and phone like concat('%', #{ phone }, '%')
                </if>
                <if test="email != null and email != ''">
                    and email like concat('%', #{ email }, '%')
                </if>
            </where>
        order by id desc
    </select>

    <select id="getById" resultType="com.example.springboot.entity.Admin">
        select * from admin where id = #{id}
    </select>

    <select id="getByUsernameAndPassword" resultType="com.example.springboot.entity.Admin">
        select * from admin where username = #{username} and password = #{password}
    </select>

    <select id="getByUsername" resultType="com.example.springboot.entity.Admin">
        select * from admin where username = #{username}
    </select>

</mapper>