Php 如何在PDO中使用%bindValue？

这就是我所拥有的

当我尝试bindValue，然后在准备好的语句%中使用它时，我有一个错误：queryString%

$query = $connect->prepare("SELECT users.firstname, users.lastname, users.id 
FROM users INNER JOIN users_friends ON users.id=users_friends.uID
WHERE bID=:USER AND type =:type AND accepted = '1' AND (users.firstname LIKE '%:queryString%' OR users.lastname LIKE '%:queryString%') 
LIMIT 10");
$query->bindValue(":queryString", $queryString);
$query->bindValue(":type", $type);
$query->bindValue(":USER", $USER);
$query->execute();

我怎样才能解决这个问题呢？

你应该这样做

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens'

然后

"... LIKE :query ..." 

---

值得注意的是，%可以是通配符或文字%。此代码没有任何区别。请在您的答案中添加解释，以便对其进行改进，并使将来的读者更容易理解。

$query->bindValue(":query", $queryString); //where $queryString is '%someQuery%'

public function admin_search($conn,$search_key){

$stmt = $conn->prepare("
SELECT name,criteria,description,pic from brd_det WHERE name LIKE(:n1)
                         UNION

SELECT name,criteria,description,pic from cus_det WHERE name LIKE (:n2)
                             UNION

SELECT name,criteria,description,pic from doc_det WHERE name LIKE (:n3)
                             UNION

SELECT name,criteria,description,pic from par_det WHERE name LIKE (:n4)
                             UNION 

SELECT name,criteria,description,pic from pro_det WHERE name LIKE(:n5)
                             UNION 

SELECT name,criteria,description,pic from ser_det WHERE name LIKE (:n6)
                             "); 

     for ($i=1; $i < 7 ; $i++) { 

        $stmt->bindvalue('n'.$i,'%'.$search_key.'%'); 

     }
     //
    $result=$stmt->execute();