mysqli_stmt::result_metadata

    mysqli_stmt_result_metadata

    (PHP 5, PHP 7, PHP 8)

    mysqli_stmt::result_metadata -- mysqli_stmt_result_metadata — Returns result set metadata from a prepared statement

    Açıklama

    Nesne yönelimli kullanım

    public mysqli_stmt::result_metadata(): mysqli_result|false

    Yordamsal kullanım

    mysqli_stmt_result_metadata(mysqli_stmt $statement): mysqli_result|false

    If a statement passed to mysqli_prepare() is one that produces a result set, mysqli_stmt_result_metadata() returns the result object that can be used to process the meta information such as total number of fields and individual field information.

    Bilginize:

    This result set pointer can be passed as an argument to any of the field-based functions that process result set metadata, such as:

    The result set structure should be freed when you are done with it, which you can do by passing it to mysqli_free_result()

    Bilginize:

    The result set returned by mysqli_stmt_result_metadata() contains only metadata. It does not contain any row results. The rows are obtained by using the statement handle with mysqli_stmt_fetch().

    Bağımsız Değişkenler

    deyim

    Sadece yordamsal tarz: mysqli_stmt_init() işlevinden dönen bir mysqli_stmt nesnesi.

    Dönen Değerler

    Returns a result object or false if an error occurred.

    Hatalar/İstisnalar

    Eğer mysqli hata bildirimi etkinse (MYSQLI_REPORT_ERROR) ve istenen işlem başarısız olursa bir uyarı üretilir. Ek olarak, kip MYSQLI_REPORT_STRICT ise bunun yerine mysqli_sql_exception istisnası oluşur.

    Örnekler

    Örnek 1 Nesne yönelimli kullanım

    <?php
    $mysqli     = new mysqli("localhost", "my_user", "my_password", "test");

    $mysqli->query("DROP TABLE IF EXISTS friends");
    $mysqli->query("CREATE TABLE friends (id int, name varchar(20))");

    $mysqli->query("INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");

    $stmt = $mysqli->prepare("SELECT id, name FROM friends");
    $stmt->execute();

    /* get resultset for metadata */
    $result = $stmt->result_metadata();

    /* retrieve field information from metadata result set */
    $field = $result->fetch_field();

    printf("Fieldname: %s\n", $field->name);

    /* close resultset */
    $result->close();

    /* close connection */
    $mysqli->close();
    ?>

    Örnek 2 Yordamsal kullanım

    <?php
    $link     = mysqli_connect("localhost", "my_user", "my_password", "test");

    mysqli_query($link, "DROP TABLE IF EXISTS friends");
    mysqli_query($link, "CREATE TABLE friends (id int, name varchar(20))");

    mysqli_query($link, "INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");

    $stmt = mysqli_prepare($link, "SELECT id, name FROM friends");
    mysqli_stmt_execute($stmt);

    /* get resultset for metadata */
    $result = mysqli_stmt_result_metadata($stmt);

    /* retrieve field information from metadata result set */
    $field = mysqli_fetch_field($result);

    printf("Fieldname: %s\n", $field->name);

    /* close resultset */
    mysqli_free_result($result);

    /* close connection */
    mysqli_close($link);
    ?>

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    User Contributed Notes 1 note

    up
    25
    potherca at gmail dot com
    14 years ago
    If result_metadata() returns false but error/errno/sqlstate tells you no error occurred, this means your query is one that does not produce a result set, i.e. an INSERT/UPDATE/DELETE query instead of a SELECT query.

    This is stated in the documentation where it says "If a statement passed to mysqli_prepare() is one that produces a result set, mysqli_stmt_result_metadata() returns the result object", but it might not be clear to everyone what this entails exactly.

    Hope this helps.
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