【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;