MySQL數據庫中，使用游標循環遍歷

/*
對*dt庫下的所有數據表刪除docuemttype為空和documenttype為MD,PD,ET的數據：
delete from 表名 where length(documenttype)<2 or documenttype is null or documenttype in ('et','md','pd');
*/
DELIMITER $$
USE `數據庫名稱1`$$
DROP PROCEDURE IF EXISTS `存儲過程名稱1`$$
CREATE PROCEDURE `存儲過程名稱1`()
BEGIN
DECLARE str varchar(40);
DECLARE Done INT DEFAULT 0;
DECLARE rs CURSOR FOR SELECT table_name FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = '數據庫名稱1';
/* 異常處理 */
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET Done = 1;
/* 打開游標 */
OPEN rs;
/* 逐個取出當前記錄userId字段的值*/
FETCH NEXT FROM rs INTO str;
/* 遍歷數據表 */
REPEAT
delete from str where length(documenttype)<2 or documenttype is null or documenttype in ('et','md','pd');
FETCH NEXT FROM rs INTO str;
UNTIL Done END REPEAT;
/* 關閉游標 */
CLOSE rs;
END$$
DELIMITER ;

use 數據庫名稱1;
call 存儲過程名稱1;

 

 

/*
對*sd庫下的所有數據表刪除docuemttype不為空的數據
delete from 表名 where length(documenttype)>1;
*/
DELIMITER $$
USE `數據庫名稱2`$$
DROP PROCEDURE IF EXISTS `存儲過程名稱2`$$
CREATE PROCEDURE `存儲過程名稱2`()
BEGIN
DECLARE str varchar(40);
DECLARE Done INT DEFAULT 0;
DECLARE rs CURSOR FOR SELECT table_name FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = '數據庫名稱2';
/* 異常處理 */
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET Done = 1;
/* 打開游標 */
OPEN rs;
/* 逐個取出當前記錄userId字段的值*/
FETCH NEXT FROM rs INTO str;
/* 遍歷數據表 */
REPEAT
delete from str where length(documenttype)>1;
FETCH NEXT FROM rs INTO str;
UNTIL Done END REPEAT;
/* 關閉游標 */
CLOSE rs;
END$$
DELIMITER ;

use 數據庫名稱2;
call 存儲過程名稱2;

 

/*
對*et庫下的所有數據表刪除非學位論文數據：
delete from 表名 where length(doucmenttype)='' or documenttype is null or documenttype not in ('et','md','pd');
*/

DELIMITER $$
USE `數據庫名稱3`$$
DROP PROCEDURE IF EXISTS `存儲過程名稱3`$$
CREATE PROCEDURE `存儲過程名稱3`()
BEGIN
DECLARE str varchar(40);
DECLARE Done INT DEFAULT 0;
DECLARE rs CURSOR FOR SELECT table_name FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = '數據庫名稱3';
/* 異常處理 */
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET Done = 1;
/* 打開游標 */
OPEN rs;
/* 逐個取出當前記錄userId字段的值*/
FETCH NEXT FROM rs INTO str;
/* 遍歷數據表 */
REPEAT
delete from str where length(doucmenttype)='' or documenttype is null or documenttype not in ('et','md','pd');
FETCH NEXT FROM rs INTO str;
UNTIL Done END REPEAT;
/* 關閉游標 */
CLOSE rs;
END$$
DELIMITER ;

use 數據庫名稱3;
call 存儲過程名稱3;