SQL查詢失敗

Question

我希望查詢最初返回c_id> 0的所有記錄，然後根據通過文本框提供的後續條件進行過濾。但是，在第一次訪問頁面時，我沒有收到任何記錄。下面是代碼：

$ctitle = mysql_real_escape_string($_POST['ctitle']); 
$csubject = mysql_real_escape_string($_POST['csubject']); 
$creference = mysql_real_escape_string($_POST['creference']); 
$cobjecttype = mysql_real_escape_string($_POST['cobjecttype']); 
$cmaterial = mysql_real_escape_string($_POST['cmaterial']); 
$ctechnic = mysql_real_escape_string($_POST['ctechnic']); 
$cartist = mysql_real_escape_string($_POST['cartist']); 
$csource = mysql_real_escape_string($_POST['csource']); 

    $sql = "SELECT * FROM collections WHERE (
    c_id>0 AND 
    `ctitle` LIKE '{$ctitle}' AND 
    `csubject` LIKE '{$csubject}' AND 
    `creference` LIKE '{$creference}' AND 
    `cobjecttype` LIKE '{$cobjecttype}' AND 
    `cmaterial` LIKE '{$cmaterial}' AND 
    `ctechnic` LIKE '{$ctechnic}' AND 
    `csource` LIKE '{$csource}' AND 
    `cartist` LIKE '{$cartist}' 
    )ORDER BY c_id DESC"; 

當我附和查詢我得到如下印刷代替：

request "Could not execute SQL query" SELECT * FROM collections WHERE (c_id>0 AND `ctitle` LIKE '' AND `csubject` LIKE '' AND `creference` LIKE '' AND `cobjecttype` LIKE '' AND `cmaterial` LIKE '' AND `ctechnic` LIKE '' AND `csource` LIKE '' AND `cartist` LIKE '')ORDER BY c_id DESC 

哪裏應該何去何從？

Answer 1

將一個空間)和ORDER BY

Answer 2

之間不需要四處拖where子句元素的括號。

Answer 3

好吧...我想我明白了...嘗試更換LIKE'與LIKE '％'

LIKE'將無法​​工作，因爲那隻能說明空列。通過添加通配符（％）它將顯示匹配所有行的所有行。但它可能是一個更好，更乾淨的解決方案，可以完全動態地構建查詢，省略空WHERE條件。