Question

In a MYSQL Stored-Procedure I need to select both the table columns, and select columns into variables for further use within that procedure.

Below, a simplified version of the stored-procedure.

DECLARE pUSR_ID BIGINT;
DECLARE pPRJ_ID BIGINT;
DECLARE pUSR_LAN_ID BIGINT;

SELECT USR_ID, USR_Login, USR_Password, USR_Archived, USR_Deleted, 
  USR_ID, USR_PRJ_ID, USR_LAN_ID INTO pUSR_ID, pPRJ_ID, pUSR_LAN_ID
FROM tblUsers
WHERE USR_Login = 'foobar';

When I execute the above stored-procedure, I get the following error message, which makes sense.

Error Code: 1222. The used SELECT statements have a different number of columns

So, I placed the variables first, and the other columns after the variables.

SELECT USR_ID, USR_PRJ_ID, USR_LAN_ID INTO pUSR_ID, pPRJ_ID, pUSR_LAN_ID,
  USR_ID, USR_Login, USR_Password, USR_FullName, USR_IsProjectAdmin, USR_Archived,
  USR_Deleted

Executing this returns: Error 1327: Undeclared variable: USR_ID. I understand why I am getting the error.

What I don't understand is how I can both select the table columns and select certain columns into variables in the same statement?

Answer 1

/*
DECLARE pUSR_ID BIGINT;
DECLARE pPRJ_ID BIGINT;
DECLARE pUSR_LAN_ID BIGINT;
*/ /*no need to declare*/


SELECT 
@pUSR_ID:=USR_ID, 
USR_Login, 
USR_Password, 
USR_Archived, 
USR_Deleted, 
USR_ID, 
@pPRJ_ID:=USR_PRJ_ID, 
@pUSR_LAN_ID:=USR_LAN_ID 
FROM tblUsers
WHERE USR_Login = 'foobar';