根据列值更新不同表中的不同列

Question

I'm trying to what is wrote in the question, probably is a stupid question but I can't find a solution, basically this is what I would like to do:

if(a.operator_id!=0){
    UPDATE ".$SupportTicketsTable." a ,".$SupportUserTable." b 
    SET a.title=? , a.priority=?, a.ticket_status=?, 
    b.solved_tickets= CASE 
        WHEN a.ticket_status!='0' THEN (b.solved_tickets+1) 
        ELSE b.solved_tickets END , 
    b.assigned_tickets= CASE  
        WHEN a.ticket_status!='0' THEN (b.assigned_tickets-1) 
        ELSE b.assigned_tickets END ,a.ticket_status='0' 
    WHERE a.enc_id=? AND b.id=a.operator_id
}
else{
    UPDATE ".$SupportTicketsTable." a ,".$SupportUserTable." b 
    SET a.title=? , a.priority=?, a.ticket_status=?
        ELSE b.assigned_tickets END ,a.ticket_status='0' 
    WHERE a.enc_id=?
}

When a.operator_id=0 there isn't a value for b.id that will match the condition Is there a way to do this in only one query? Thanks in advance

Answer 1

1. I think that your branch ELSE is wrong:

    ... else{ UPDATE ".$SupportTicketsTable." a ,".$SupportUserTable." b SET a.title=? , a.priority=?, a.ticket_status=? ELSE b.assigned_tickets END ,a.ticket_status='0' WHERE a.enc_id=? } 

2. You can create one or two srored procedures with a dynamicSQL inside and put tablenames as a parameter into there. for example:

    DELIMITER $$ DROP PROCEDURE IF EXISTS my_proc $$ CREATE PROCEDURE my_proc (IN SupportTicketsTable VARCHAR(20), IN SupportUserTable VARCHAR(20)) BEGIN SET @SQLS = CONCAT('UPDATE ',SupportTicketsTable, 'a ', SupportUserTable,' b SET a.title=? , a.priority=?, a.ticket_status=?, b.solved_tickets= CASE WHEN a.ticket_status!='0' THEN (b.solved_tickets+1) ELSE b.solved_tickets END , b.assigned_tickets= CASE WHEN a.ticket_status!='0' THEN (b.assigned_tickets-1) ELSE b.assigned_tickets END , a.ticket_status='0' WHERE a.enc_id=? AND b.id=a.operator_id'; PREPARE STMT FROM @SQLS; EXECUTE STMT; DEALLOCATE PREPARE STMT; END$$