Mybatis批量更新,批量删除

Mybatis批量更新

1、單個字段批量更新

<!--批量更新使用者預約狀态-->
    <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>      

代碼轉化成

sql

如下:

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

2、多個字段批量更新

<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标簽的使用

MyBatis的trim标簽一般用于去除sql語句中多餘的and關鍵字，逗号，或者給sql語句前拼接 “where“、“set“以及“values(“ 等字首，或者添加“)“等字尾，可用于選擇性插入、更新、删除或者條件查詢等操作。

屬性	描述
prefix	給sql語句拼接的字首 表示在trim包裹的SQL前添加指定内容
suffix	給sql語句拼接的字尾 表示在trim包裹的SQL末尾添加指定内容
prefixOverrides	表示去掉（覆寫）trim包裹的SQL的指定首部内容 去除sql語句前面的關鍵字或者字元，該關鍵字或者字元由prefixOverrides屬性指定，假設該屬性指定為"AND"，當sql語句的開頭為"AND"，trim标簽将會去除該"AND"
suffixOverrides	表示去掉（覆寫）trim包裹的SQL的指定尾部内容 去除sql語句後面的關鍵字或者字元，該關鍵字或者字元由suffixOverrides屬性指定

Mybatis批量删除

1、傳數組

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、傳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、多參數批量删除示例

如果删除不是以主鍵為條件，而是多個條件同時成立才可以删除

<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>
<delete id="deleteUserJob" parameterType="java.util.List">
    delete from sys_user_job where
    <foreach collection="list" item="item" separator=" or " index="index">
        (user_id = #{item.userId} and job_id= #{item.jobId})
    </foreach>
</delete>      

備注

Mybatis：通過on duplicate key update實作批量插入或更新

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

參考連結:

https://www.cnblogs.com/javalanger/p/10899088.html