【数据库-MySql】清空所有表格的所有数据

方式一、

drop procedure if exists del_all_tb;





delimiter $$





create procedure del_all_tb(db char(20))





begin





    declare done int default 0;





    declare tb char(100);





    declare cur cursor for select table_name from infoRmation_schema.tables where table_schema = db and table_type = "BASE TABLE";





    declare continue handler for not found set done = 1;





    open cur;    





 





    repeat





        fetch cur into tb;





        set @sql := concat("truncate ", tb, ";");





        prepare stmt from @sql;





        execute stmt;





        deallocate prepare stmt; 





    until done end repeat;





    close cur;





end $$





delimiter ;





call del_all_tb("atdps");





drop procedure if exists del_all_tb;

方式二、

#如果存在del_all_tb存储过程则删除del_all_tb存储过程





drop procedure if exists del_all_tb;





#如果存在 tmpTable 临时表则删除 del_all_tb 临时表





DROP TABLE if EXISTS tmpTable;





#创建 del_all_tb存储过程





create procedure del_all_tb(db char(20))





begin





		#申明变量





    DECLARE tntmp VARCHAR(100); 		





		#创建临时表





    create table tmpTable (tablename VARCHAR(100),flag int); 





		#清空临时表





    truncate TABLE tmpTable;





		#将需要清空的表插入到临时表





	  INSERT INTO tmpTable(tablename , flag ) (SELECT table_name ,0 as a FROM information_schema.tables 





        WHERE table_schema = db and table_type='BASE TABLE');





		





		#循环获取所有的表明以及删除状态





    SELECT tablename into tntmp FROM tmpTable WHERE flag = 0 limit 1;





		WHILE tntmp <> '' DO 





				





				#拼写删除语句





				set @sqlText := concat("truncate ", tntmp, ";");





        prepare stmt from @sqlText;





				#执行语句





        execute stmt;





				#释放删除语句





        deallocate prepare stmt;





				#更新表状态





				UPDATE tmpTable SET flag=1 WHERE tablename = tntmp;





				#选择一下条语句





				SELECT tablename into tntmp FROM tmpTable WHERE flag = 0 limit 1;





		END WHILE;





end;





call del_all_tb("atdps");





 





#如果存在del_all_tb存储过程则删除del_all_tb存储过程





drop procedure if exists del_all_tb;





#如果存在 tmpTable 临时表则删除 del_all_tb 临时表





DROP TABLE if EXISTS tmpTable;