merge語法根據源表(也可是臨時生成的表)對目標表進行查詢匹配,匹配成功時執行更新操作,不成功時執行插入操作。

1.基本語法：

merge into 目標表 T

using 源表 T1

on (T.xx1 = T1.xx1 and T.xx2=T1.xx2/*匹配條件*/)

when matched then update set

    /*需要更新的欄位*/

    T.x = T1.x...

when not matched then insert

    (

    欄位1，

    欄位2...   

    )

values(

值1，

值2...

    )

<insert id="saveOrUpdateBatch" 
 
parameterType="java.util.List">

    MERGE INTO T_ZZ_RS_EDU T
    USING (
<foreach collection="list" item="item" index="index" separator="union">
        (select #{item.eduExpid,jdbcType=DECIMAL} AS RS_EID,
        #{item.personName,jdbcType=VARCHAR} AS NAME_,
        #{item.idCard,jdbcType=VARCHAR} AS IDCARD,
 
        #{item.populationId,jdbcType=DECIMAL} AS CI_RS_ID,
        #{item.startDate,jdbcType=TIMESTAMP} AS START_DATE,
        #{item.endDate,jdbcType=TIMESTAMP} AS END_DATE,
        #{item.workUnit,jdbcType=VARCHAR} AS WORK_UNIT,
        #{item.workDuty,jdbcType=VARCHAR} AS WORK_DUTY,
        #{item.regionCode,jdbcType=VARCHAR} AS REGION_CODE,
 
        #{item.status_,jdbcType=VARCHAR} AS STATUS_,
        #{item.creatorId,jdbcType=DECIMAL} AS CREATOR,
        #{item.createTime,jdbcType=TIMESTAMP} AS CREATE_TIME,
        #{item.updaterId,jdbcType=DECIMAL} AS UPDATER,
        #{item.updateTime,jdbcType=TIMESTAMP} AS UPDATED,
        #{item.resumeType,jdbcType=VARCHAR} AS RESUME_TYPE
        from dual)
</foreach>) T1
    ON(T1.RS_EID = T.RS_EID)
    /*資料存在*/
    WHEN MATCHED THEN
        UPDATE SET
        T.RESUME_TYPE/*需要更新的欄位*/=T1.RESUME_TYPE,/*需要更新的欄位*/
        T.START_DATE=T1.START_DATE,
        T.END_DATE=T1.END_DATE,
        T.WORK_UNIT=T1.WORK_UNIT,
        T.WORK_DUTY=T1.WORK_DUTY
    /*資料不存在*/
    WHEN NOT MATCHED THEN
        INSERT
        (
        T.RS_EID,
        T.NAME_,
        T.IDCARD,
        T.CI_RS_ID,
        T.START_DATE,
        T.END_DATE,
        T.WORK_UNIT,
        T.WORK_DUTY,
        T.REGION_CODE,
        T.STATUS_,
        T.CREATOR,
        T.CREATE_TIME,
        T.UPDATER,
        T.UPDATED,
        T.RESUME_TYPE
        )
        VALUES
        (
        SEQ_RS_EID.NEXTVAL,
        T1.NAME_,
        T1.IDCARD,
        T1.CI_RS_ID,
        T1.START_DATE,
        T1.END_DATE,
        T1.WORK_UNIT,
        T1.WORK_DUTY,
        T1.REGION_CODE,
        T1.STATUS_,
        T1.CREATOR,
        T1.CREATE_TIME,
        T1.UPDATER,
        T1.UPDATED,
        T1.RESUME_TYPE
        )
</insert>