MySQL控制流建议（CASE / THEN）

Question

I have a very peculiar problem on my hands. I have a project where the previous db engineer didn't gave a thought on db design and now im stuck with it. My question is simple:

I have two different select queries and one of them should be executed if a field is set or not, ie

if field1 is 0 -> execute query 1 if field1 is 1 -> execute query 2

So far i got here:

SELECT should_i_care
FROM 
    product_sample
WHERE
    pid='XXX'
CASE should_i_care
    WHEN '1' then call query2
    WHEN '0' then call query1

But found out that i cant declare the queries i want to run. Any suggestions?

Answer 1

It should be a script or stored procedure like this

DECLARE  shouldICare INT; 

SELECT @shouldICare := should_i_care
FROM 
    product_sample
WHERE
    pid='XXX';

IF @shouldICare = 1 THEN
   Call query2;
ELSE
   Call query1;
END IF;