I have a case where getting the table name should be from a set variable like:
我有这样一个例子，从集合变量中获取表名应该是:
SET @ID_1 = (SELECT ID FROM `slider` LIMIT 0,1);
SET @Cat = (SELECT Category FROM `slider` LIMIT 0,1);
select * from @Cat where ID = @ID_1
but doing that way MySQL outputs an error, so could someone show me how I can achieve that, because these are my baby steps in MySQL.
但是这样做MySQL会输出一个错误，有人可以告诉我如何实现这个错误，因为这是我在MySQL中的小步骤。
1 个解决方案
#1
64
You'd have to do this with a prepared statement. Something like:
你必须用事先准备好的声明来做这件事。喜欢的东西:
SET @s = CONCAT('select * from ', @Cat, ' where ID = ', @ID_1);
PREPARE stmt1 FROM @s;
EXECUTE stmt1;
DEALLOCATE PREPARE stmt1;
#1
64
You'd have to do this with a prepared statement. Something like:
你必须用事先准备好的声明来做这件事。喜欢的东西:
SET @s = CONCAT('select * from ', @Cat, ' where ID = ', @ID_1);
PREPARE stmt1 FROM @s;
EXECUTE stmt1;
DEALLOCATE PREPARE stmt1;