定期自动删除数据

1、定义表：Table_To_Purge  [Table_Name,Day_Latency,Date_Field_Name]

用于存储需要删除的表的信息，表名、删除时间、字段名

  

2、设置一个job定期执行存储过程：EXECUTE [TISC].[dbo].[PURGE_TABLES]

  

3、编写存储过程：

CREATE PROCEDURE DBO.PURGE_TABLES AS
DECLARE
@tablename AS varchar(64),
@daylatency AS int,
@datefieldname AS varchar(64),
@sqldelete AS varchar(512),
@eldest AS int
BEGIN
DECLARE TABLE_CURSOR CURSOR FOR
 SELECT TABLE_NAME, DAY_LATENCY, DATE_FIELD_NAME FROM TABLE_TO_PURGE

 BEGIN
  SET @eldest = 0
  OPEN TABLE_CURSOR
  FETCH NEXT FROM TABLE_CURSOR INTO @tablename, @daylatency, @datefieldname
  WHILE (@@FETCH_STATUS = 0)
  BEGIN
   IF ((@datefieldname = 'PIECE_ID') OR (@datefieldname = 'PLATEID') OR (@datefieldname = 'PLATE_ID'))
   BEGIN
    SET @sqldelete = 'delete FROM ' + @tablename +
    ' WHERE ' + @datefieldname + ' IN (SELECT PIECE_ID FROM PIECE_PRODUCTION WHERE DISCHARGING_TIME < (GETDATE() - ' +
    CAST(@daylatency AS varchar(3)) + '))'
   END
   ELSE
   BEGIN
    SET @sqldelete = 'delete FROM ' + @tablename + ' WHERE ' + @datefieldname +
    ' < (GETDATE() - ' + CAST(@daylatency AS varchar(3)) + ')'
   END
   PRINT @sqldelete
   EXECUTE (@sqldelete)
   PRINT CAST(@@ROWCOUNT AS varchar(5))
   IF (@eldest < @daylatency)
   BEGIN
    SET @eldest = @daylatency
   END
   FETCH NEXT FROM TABLE_CURSOR INTO @tablename, @daylatency, @datefieldname
  END

  CLOSE TABLE_CURSOR
  DEALLOCATE TABLE_CURSOR

  DELETE FROM PIECE_PRODUCTION WHERE DISCHARGING_TIME < (GETDATE() - @eldest)
  DELETE FROM MILL_PDI WHERE CREATION_TIME  < (GETDATE() -20)
 END
END
GO