Question

我是PDO的新手，并试着这个

function ExecuteSqlQuery($connection, $sqlQuery, $paramsArray)
{
    try
    {
         $sql = $connection->prepare($sqlQuery);
         $sql->setFetchMode(PDO::FETCH_ASSOC);
         $sql->execute($paramsArray);
         $result = $sql->fetchall(PDO::FETCH_ASSOC);
    }
    ... etc

$result总是一个空数组。

有人能告诉我我做错了吗？

$connection有效（我检查（未显示），但如果不是则会抛出异常）

paramsArray = array('modem_id' => '1');
$sqlQuery = "SELECT vehicle_id FROM vehicles WHERE modem_id=":modem_id"

[更新] 根据要求，这里是更详细的代码。

function ExecuteSqlQuery($connection, $sqlQuery, $paramsArray)
{
    try
    {
         $sql = $connection->prepare($sqlQuery);
         $sql->setFetchMode(PDO::FETCH_ASSOC);
         $sql->execute($paramsArray);
         $result = $sql->fetchall(PDO::FETCH_ASSOC);
    }

... etc Nothing matters after this point in the function, 
as things have already gone wrong - $result is NULL

    catch (Exception $e)
    {
         echo $e->getMessage();  // This code is not reached
    }
}   // ExecuteSqlQuery()


  $connection = ConnectToDatabase();  // Do you need the code for that? It works, my IDE shows a PDO object
  $connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

  $queryParams = array('modem_id' => "1");
  $sqlQuery = 'SELECT vehicle_id FROM ' . DATABASE_NAME . '.vehicles WHERE modem_id=":modem_id"';
  $result     = ExecuteSqlQuery($connection, $sqlQuery, $queryParams);

Answer 1

你不应该像你一样引用参数：

$sqlQuery = 'SELECT vehicle_id 
             FROM ' . DATABASE_NAME . '.vehicles 
             WHERE modem_id=":modem_id"';//remove quotes

将其更改为以下内容：

$sqlQuery = 'SELECT vehicle_id 
             FROM ' . DATABASE_NAME . '.vehicles 
             WHERE modem_id=:modem_id';

PDO执行（）然后使用绑定参数fetchall（）。我无法让它发挥作用

1 个答案: