声明变量语法在MySQL Workbench中无效吗?

本文介绍了声明变量语法在MySQL Workbench中无效吗?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在尝试创建和设置变量:

I am trying to create and set a variable:

DECLARE myId INT;
SET myId = 5;

但是，我在MySQL Workbench中收到无效的语法投诉:

However, I am getting invalid syntax complaint in MySQL Workbench:

我尝试了以下变体:

DECLARE myId INT(4);
SET myId = 5;

DECLARE @myId INT;
SET @myId = 5;

DECLARE @myId INT(4);
SET @myId = 5;

怎么了?

推荐答案

正如评论中所说，声明仅对诸如过程，函数之类的存储程序有效.这里有一个存储过程及其调用的示例.

As in the comment says Declare is only valid into stored programs like procedures, functions.here you have an example of a store procedure and its call.

DELIMITER $$

CREATE PROCEDURE sp1 (x VARCHAR(5))
BEGIN
  DECLARE xname VARCHAR(5) DEFAULT 'bob';
  DECLARE myId INT;


  SET myId = 5;
  SELECT CONCAT(xname,' -- ',myId);
END;
$$

DELIMITER ;

call sp1('MY NAME');

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myid