綁定多個參數

Question

我的PHP是這樣的：

$sql1="SELECT @rownum := @rownum + 1 Rank, q.* FROM (SELECT @rownum:=0) r,(SELECT * ,sum(`number of cases`) as tot, sum(`number of cases`) * 100/t.s AS `% of total` FROM `myTable` CROSS JOIN (SELECT SUM(`number of cases`) AS s FROM `myTable` where `type`=:criteria and `condition`=:diagnosis) t where `type`=:criteria and `condition`=:diagnosis group by `name` order by `% of total` desc) q""; 
$stmt = $dbh->prepare($sql1); 
$stmt->bindParam(':criteria', $search_crit, PDO::PARAM_STR); 
$stmt->bindParam(':diagnosis', $diagnosis, PDO::PARAM_STR); 
$stmt->execute(); 
$result1 = $stmt->fetchAll(PDO::FETCH_ASSOC); 
header('Content-type: application/json'); 
echo json_encode($result1); 

我在這條線得到一個錯誤：$stmt->execute();

錯誤說：

PHP Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY093]: Invalid parameter number' in php/rankings.php:39

堆棧跟蹤：

"#"0 php/rankings.php(39): PDOStatement->execute()

"#"1 {main} thrown in php/rankings.php on line 39

我該如何解決這個問題？我知道我可以通過一個準備好的聲明傳遞多個變量，但我不太確定如何去做。

Answer 1

您可以在查詢中使用的參數只有一次

$sql1="SELECT @rownum := @rownum + 1 Rank, q.* FROM (SELECT @rownum:=0) r,(SELECT * ,sum(`number of cases`) as tot, sum(`number of cases`) * 100/t.s AS `% of total` FROM `myTable` CROSS JOIN (SELECT SUM(`number of cases`) AS s FROM `myTable` where `type`=:criteria and `condition`=:diagnosis) t where `type`=:criteria2 and `condition`=:diagnosis2 group by `name` order by `% of total` desc) q"; 
$stmt = $dbh->prepare($sql1);  
$stmt->execute(array(':criteria' => $search_crit, ':diagnosis' => $diagnosis, ':criteria2' => $search_crit, ':diagnosis2' => $diagnosis)); 

Answer 2

您可以添加一個數組來執行語句是這樣的：

$sql1="SELECT * FROM myTable WHERE `area` = :criteria AND `condition` = :diagnosis"; 
    $stmt = $dbh->prepare($sql1);  
    $stmt->execute(array('criteria' => $search_crit, 'diagnosis' => $diagnosis));