PDO bindParam没有绑定在ON ... AND LIKE

Question

我正在尝试将一些查询转换为PDO，并且特别是在WAMP服务器上运行时遇到一个查询的困难。如果我按照以下方式构造行，我能够将参数作为字符串“强制”，我能够使查询正常工作，但缺点是它没有绑定，我必须在同一个PHP文件中查询：

AND B.LongName LIKE '" . $searchPattern . "'

未绑定的查询设置如下：

$query_NotWorking = "SELECT
A.Description AS 'Description',
A.LongName AS 'LongName',
A.thisID AS 'This_ID',
B.LongName AS 'TargetName',
B.TargetID AS 'Target_ID',
B.NodeNumber AS 'Node',
FROM Sources A
LEFT JOIN Targets B
    ON A.thisID = B.DestID
    AND B.LongName LIKE :SearchPattern
    WHERE B.LongName IS NOT NULL
ORDER BY 'LongName', 'TargetName';";

调用查询的页面中的PHP代码如下：

$searchPattern = "%Pattern%";

$stmt_Copy1 = $dbh_Pri -> prepare($query_NotWorking);
$stmt_Copy2 = $dbh_Sec -> prepare($query_NotWorking);

$stmt_Copy1 -> bindParam(':SearchPattern', $searchPattern, PDO::PARAM_STR, 15);
$stmt_Copy1 -> execute();

$stmt_Copy2 -> bindParam(':SearchPattern', $searchPattern, PDO::PARAM_STR, 15); 
$stmt_Copy2 -> execute();