duanquan1876
2017-12-19 22:06
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将PHP PDO迁移到Laravel PDO会导致参数号无效

I'm converting a PHP PDO instance to Laravel 5.5. I changed the DB connection from/to:

//$dbc = new PDO ('mysql:host='. $DB_HOST .';dbname='. $DB_NAME, $DB_USER, $DB_PASS);
$dbc = \Illuminate\Support\Facades\DB::connection('foobardb')->getPdo();

For some reason, this is causing my SELECT query to fail.

$query = "SELECT *
          FROM foobartable
          WHERE date_created > :sunday
          AND date_created <= :monday
          AND date_updated > :sunday
          AND date_updated <= :monday";

$stmt = $dbc->prepare($query);
$stmt->bindValue(':monday', $monday, PDO::PARAM_STR);
$stmt->bindValue(':sunday', $sunday, PDO::PARAM_STR);
$stmt->execute();

$results = $stmt->fetchAll(PDO::FETCH_ASSOC);

According to the stack trace, the error is specifically triggered on the $stmt->execute();

SQLSTATE[HY093]: Invalid parameter number

I obviously have the correct parameters, and this works just fine using PHP's PDO instance, so why does it not work with Laravel?

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  • duanruoyu6675 2017-12-19 22:06
    已采纳

    For some reason, Laravel connections will not automatically use PDO::ATTR_EMULATE_PREPARES. Even if a mysql connection. Simply add the option in the connection array to fix this.

    'foobardb' => [
        'driver'    => 'mysql',
        'host'      => env('DB_HOST', 'localhost'),
        'port'      => env('DB_PORT', 3306),
        'database'  => 'foobardb',
        'username'  => env('DB_USERNAME', 'forge'),
        'password'  => env('DB_PASSWORD', ''),
        'charset'   => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix'    => '',
        'strict'    => false,
        'engine'    => null,
        //add addition options here
        'options'   => [PDO::ATTR_EMULATE_PREPARES => true]
    ],
    

    I don't know if this is limited to Laravel 5.5, or if the option will need to be added in earlier versions as well.

    Another way to fix this is to just do something like:

    $query = "SELECT *
              FROM foobartable
              WHERE date_created > :sunday
              AND date_created <= :monday
              AND date_updated > :sunday2
              AND date_updated <= :monday2";
    

    And then:

    $stmt->bindValue(':monday', $monday, PDO::PARAM_STR);
    $stmt->bindValue(':sunday', $sunday, PDO::PARAM_STR);
    $stmt->bindValue(':monday2', $monday, PDO::PARAM_STR);
    $stmt->bindValue(':sunday2', $sunday, PDO::PARAM_STR);
    

    So that it thinks you have the same number of PDO Tokens as you have bindValues.

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