采用存储过程的方式批量更新数据

采用存储过程的方式批量更新数据，Oracle中也可采用merge-update的方式更新，不过采用如下存储过程的方式会更快些

DECLARE  MAX_ROWS            NUMBER DEFAULT 5000;  ROW_ID_TABLE        DBMS_SQL.UROWID_TABLE;  DATE_TIME_TABLE      DBMS_SQL.DATE_TABLE;  CURSOR C1 IS    SELECT /*+ use_hash(t1,t2) parallel(t1,2) parallel(t2,2) */     T1.DATE_TIME, T2.ROWID      FROM TEST_TABLE_1 T1, TEST_TABLE_2 T2     WHERE T1.TABLE_ID = T2.TABLE_ID       AND T2.DATE_TIME IS NULL       AND T1.DATE_TIME IS NOT NULL       ORDER BY T2.ROWID;BEGIN  OPEN C1;  LOOP    EXIT WHEN C1%NOTFOUND;    FETCH C1 BULK COLLECT      INTO DATE_TIME_TABLE, ROW_ID_TABLE LIMIT MAX_ROWS;    FORALL I IN 1 .. ROW_ID_TABLE.COUNT      UPDATE TEST_TABLE_2         SET DATE_TIME = DATE_TIME_TABLE(I), LCD=SYSDATE       WHERE ROWID = ROW_ID_TABLE(I);    COMMIT;  END LOOP;  CLOSE C1;END;/