格式化mysql查詢輸出

Question

在我的查詢中，我想檢查具有指定權限的用戶是否存在。目前我正在使用下面的查詢。它將檢索具有指定條件的授權用戶行。

select a.ixUserAuthorization from tblechecklistuserroleassignmentxref r 
inner join tblechecklistuserrole u on u.ixUserRole=r.ixUserRole and u.sname='Initiator' 
inner join tblechecklistuserauthorization a on a.ixUserAuthorization=r.ixUserAuthorization 
and a.ixcustomer='1'and a.ixprogram='1'and a.ixworkpackage='1'and a.ixactivity='1' and a.ixUser='626e28e8-e67a-4d11-8d2c-129d0ab79e96'; 

如果任何行返回我想要顯示的結果爲真，如果沒有行從上述查詢我想要顯示的結果爲假返回。

如何修改以獲得結果爲true或false。

Answer 1

SELECT CASE 
     WHEN Count(*) >= 1 THEN 'true' 
     ELSE 'false' 
     END AS Answer 
FROM (SELECT a.ixUserAuthorization 
     FROM tblechecklistuserroleassignmentxref r 
       INNER JOIN tblechecklistuserrole u 
       ON u.ixUserRole = r.ixUserRole 
        AND u.sname = 'Initiator' 
       INNER JOIN tblechecklistuserauthorization a 
       ON a.ixUserAuthorization = r.ixUserAuthorization 
        AND a.ixcustomer = '1' 
        AND a.ixprogram = '1' 
        AND a.ixworkpackage = '1' 
        AND a.ixactivity = '1' 
        AND a.ixUser = '626e28e8-e67a-4d11-8d2c-129d0ab79e96') a 

Answer 2

使用功能mysql_num_rows

例如：

if(mysql_num_rows($result)) 
    echo "true"; 
else 
    echo "false"; 

其中$結果是查詢的結果是否計數（）可以用來