PHP Dokumentation: Mysqli-stmt result-metadata
12. Januar 2010 von werner
mysqli_stmt::result_metadata
mysqli_stmt_result_metadata
(PHP 5)
mysqli_stmt::result_metadata — mysqli_stmt_result_metadata — Returns result set metadata from a prepared statement
Beschreibung
Object oriented style (method):
Procedural style:
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.
Hinweis: 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()
Hinweis: 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().
Parameter-Liste
- stmt
Nur bei prozeduralem Aufruf: ein vonmysqli_stmt_init() zurückgegebensStatementobjekt.
Rückgabewerte
Returns a result object or FALSE if an error occurred.
Beispiele
Beispiel #1 Object oriented style
<?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();
?>Beispiel #2 Procedural style
<?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);
?>Siehe auch
- mysqli_prepare() – Prepare a SQL statement for execution
- mysqli_free_result() – Frees the memory associated with a result
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