2023-09-15每日总结

今天进行了小测，

对于数据库中各种查询

<?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.demo.mapper.LoginMapper">
    <update id="updateZeng">
        upsert into TEST(JNAME, TADDRESS, ADDRESS, EMAIL, FNAME, PHONE, JSHU, JJAN, JXU, XUMIN, XUMAX, MAINWEN, GAN, YU,
                         KEY1, KEY2, KEY3, KEY4, KEY5, JIJIE, KEHE)
        VALUES (#{JName}, #{TAddress}, #{address}, #{email}, #{FName}, #{phone}, #{JShu}, #{JJan}, #{JXu}, #{XuMin},
                #{XuMax}, #{MainWen}, #{gan}, #{yu}, #{key1}, #{key2}, #{key3}, #{key4}, #{key5}, #{JiJue}, #{KeHe})
    </update>
    <delete id="deleteZeng">
        delete
        from TEST
        where JNAME = #{JName}
    </delete>
    <select id="selectAll" resultType="com.example.demo.pojo.login">
        select *
        from TEST
    </select>
    <select id="selectByDuo" resultType="com.example.demo.pojo.login">
        select * from TEST
        <where>
            <if test="JName !=null">
                JName like #{JName}
            </if>
            <if test="address != null">
                or address like #{address}
            </if>
            <if test="JXu != null">
                or JXu like #{JXu}
            </if>
            <if test="key1 != null">
                or key1 like #{key1}
            </if>
        </where>
        order by JName desc
    </select>
    <select id="selectCount" resultType="com.example.demo.pojo.login">
        select count(*)
        from TEST
        where KEHE = #{KeHe}
    </select>
    <select id="selectOne" resultType="com.example.demo.pojo.login">
        select * from TEST where JNAME=#{JName}
    </select>
</mapper>