【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;