[英]Sum columns on different tables and multiply by value of a column on another table
[英]Update different columns in different tables based on column value
我正在尝试写问题中的内容,可能是一个愚蠢的问题,但我找不到解决方案,基本上这是我想做的事情:
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=?
}
当a.operator_id=0
,没有与条件匹配的b.id
值是否只有一种查询可以做到这一点? 提前致谢
我认为您的分支ELSE是错误的:
... 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=? }
您可以在内部创建一两个动态SQL的存储过程,并将表名作为参数放入其中。 例如:
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$$
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