Mybatis批量更新,批量删除

Posted 2021-06-30 琦彦

目录

Mybatis批量更新

1、单个字段批量更新

2、多个字段批量更新

trim标签的使用

Mybatis批量删除

1、传数组

2、传map

3、多参数批量删除示例

备注

Mybatis：通过on duplicate key update实现批量插入或更新

---

Mybatis批量更新

1、单个字段批量更新

    <!--批量更新用户预约状态-->
    <update id="batchUpdateReserveStatus" parameterType="java.util.List">
        update dm_simulator_reserve_user
        <trim prefix="set" suffixOverrides=",">
            <trim prefix="reserve_status =case" suffix="end,">
                <foreach collection="list" item="item" index="index">
                    <if test="item.reserveStatus !=null and item.reserveStatus != -1">
                        when id=#{item.id} then #{item.reserveStatus}
                    </if>
                </foreach>
            </trim>
        </trim>
        where id in
        <foreach collection="list" index="index" item="item" separator="," open="(" close=")">
            #{item.id,jdbcType=BIGINT}
        </foreach>
    </update>

代码转化成sql如下:

update dm_simulator_reserve_user 
set reserve_status =
case when id=? then ? when id=? then ? end 
where id in ( ? , ? )

2、多个字段批量更新

<update id="updateBatch" parameterType="java.util.List">
    update t_user
    <trim prefix="set" suffixOverrides=",">
        <trim prefix="STATUS =case" suffix="end,">
            <foreach collection="list" item="i" index="index">
                <if test="i.status!=null">
                    when USER_ID=#{i.userId} then #{i.status}
                </if>
            </foreach>
        </trim>
        <trim prefix=" OPERATE_TIME =case" suffix="end,">
            <foreach collection="list" item="i" index="index">
                <if test="i.operateTime!=null">
                    when USER_ID=#{i.userId} then #{i.operateTime}
                </if>
            </foreach>
        </trim>

        <trim prefix="OPERATOR =case" suffix="end," >
            <foreach collection="list" item="i" index="index">
                <if test="i.operator!=null">
                    when USER_ID=#{i.userId} then #{i.operator}
                </if>
            </foreach>
        </trim>
    </trim>
    where
    <foreach collection="list" separator="or" item="i" index="index" >
        USER_ID=#{i.userId}
    </foreach>
</update>

trim标签的使用

MyBatis的trim标签一般用于去除sql语句中多余的and关键字，逗号，或者给sql语句前拼接 “where“、“set“以及“values(“ 等前缀，或者添加“)“等后缀，可用于选择性插入、更新、删除或者条件查询等操作。

属性	描述
prefix	给sql语句拼接的前缀 表示在trim包裹的SQL前添加指定内容
suffix	给sql语句拼接的后缀 表示在trim包裹的SQL末尾添加指定内容
prefixOverrides	表示去掉（覆盖）trim包裹的SQL的指定首部内容 去除sql语句前面的关键字或者字符，该关键字或者字符由prefixOverrides属性指定，假设该属性指定为"AND"，当sql语句的开头为"AND"，trim标签将会去除该"AND"
suffixOverrides	表示去掉（覆盖）trim包裹的SQL的指定尾部内容 去除sql语句后面的关键字或者字符，该关键字或者字符由suffixOverrides属性指定

Mybatis批量删除

1、传数组

int deleteByBatch(String[] array);
    <delete id="deleteByBatch" parameterType="java.lang.String">
        delete from t_enterprise_output_value
        where OUTPUT_ID IN
        <foreach collection="array" item="outputId" open="(" separator="," close=")">
            #{outputId}
        </foreach>
    </delete>

2、传map

<delete id="deleteByRole" parameterType="java.util.Map">
        DELETE
        FROM
        t_user_role
        <where>
            <if test="userIdList != null">
                USER_ID IN (#{userIdList,jdbcType=VARCHAR})
            </if>
            <if test="roleId != null">
                AND ROLE_ID=#{roleId,jdbcType=VARCHAR}
            </if>
            <if test="sysCode != null">
                AND SYSCODE=#{sysCode}
            </if>
        </where>
    </delete>

3、多参数批量删除示例

如果删除不是以主键为条件，而是多个条件同时成立才可以删除

<delete id="deleteByUserIdSysRoleBatch">
    delete from t_user_role
    where SYSCODE = #{sysCode,jdbcType=VARCHAR} AND ROLE_ID = #{roleId,jdbcType=VARCHAR} AND USER_ID IN
    <foreach collection="userIds" item="item" index="index" open="(" separator="," close=")">
        #{item}
    </foreach>
</delete>

备注

Mybatis：通过on duplicate key update实现批量插入或更新

https://blog.csdn.net/fly910905/article/details/104004165

参考链接: https://www.cnblogs.com/javalanger/p/10899088.html