问题
Can I SELECT multiple columns into multiple variables within the same select query in MySQL?
For example:
DECLARE iId INT(20);
DECLARE dCreate DATETIME;
SELECT Id INTO iId, dateCreated INTO dCreate
FROM products
WHERE pName=iName;
What is the correct syntax for this?
回答1:
Your syntax isn't quite right: you need to list the fields in order before the INTO, and the corresponding target variables after:
SELECT Id, dateCreated
INTO iId, dCreate
FROM products
WHERE pName = iName
回答2:
==========Advise==========
@martin clayton Answer is correct, But this is an advise only.
Please avoid the use of ambiguous variable in the stored procedure.
Example :
SELECT Id, dateCreated
INTO id, datecreated
FROM products
WHERE pName = iName
The above example will cause an error (null value error)
Example give below is correct. I hope this make sense.
Example :
SELECT Id, dateCreated
INTO val_id, val_datecreated
FROM products
WHERE pName = iName
You can also make them unambiguous by referencing the table, like:
[ Credit : maganap ]
SELECT p.Id, p.dateCreated INTO id, datecreated FROM products p
WHERE pName = iName
回答3:
Alternatively to Martin's answer, you could also add the INTO part at the end of the query to make the query more readable:
SELECT Id, dateCreated FROM products INTO iId, dCreate
来源：https://stackoverflow.com/questions/2450529/mysql-selecting-multiple-fields-into-multiple-variables-in-a-stored-procedure