根據列值更新不同表中的不同列

Question

我正在嘗試寫問題中的內容，可能是一個愚蠢的問題，但我找不到解決方案，基本上這是我想做的事情：

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=?
}

當a.operator_id=0 ，沒有與條件匹配的b.id值是否只有一種查詢可以做到這一點？ 提前致謝

Answer 1

1. 我認為您的分支ELSE是錯誤的：

    ... 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=? } 

2. 您可以在內部創建一兩個動態SQL的存儲過程，並將表名作為參數放入其中。 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$$