我可以在 MySQL 的同一个选择查询中将多个列选择到多个变量中吗?
例如:
DECLARE iId INT(20);
DECLARE dCreate DATETIME;
SELECT Id INTO iId, dateCreated INTO dCreate
FROM products
WHERE pName=iName;
什么是正确的语法?
我可以在 MySQL 的同一个选择查询中将多个列选择到多个变量中吗?
例如:
DECLARE iId INT(20);
DECLARE dCreate DATETIME;
SELECT Id INTO iId, dateCreated INTO dCreate
FROM products
WHERE pName=iName;
什么是正确的语法?
您的语法不太正确:您需要在 INTO 之前按顺序列出字段,并在之后列出相应的目标变量:
SELECT Id, dateCreated
INTO iId, dCreate
FROM products
WHERE pName = iName
==========建议==========
@martin Clayton 答案是正确的,但这只是一个建议。
请避免在存储过程中使用不明确的变量。
例子 :
SELECT Id, dateCreated
INTO id, datecreated
FROM products
WHERE pName = iName
上面的例子会导致错误(空值错误)
下面给出的示例是正确的。我希望这是有道理的。
例子 :
SELECT Id, dateCreated
INTO val_id, val_datecreated
FROM products
WHERE pName = iName
您还可以通过引用表格使它们明确,例如:
[信用:maganap ]
SELECT p.Id, p.dateCreated INTO id, datecreated FROM products p
WHERE pName = iName
除了 Martin 的回答之外,您还可以在查询末尾添加 INTO 部分,以使查询更具可读性:
SELECT Id, dateCreated FROM products INTO iId, dCreate