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mysqli_stmt::result_metadata

MySQLi_STMT PHP Manual

(PHP 5)

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

Beschreibung

Object oriented style (method):

mysqli_result mysqli_stmt::result_metadata ( void )

Procedural style:

mysqli_result mysqli_stmt_result_metadata ( mysqli_stmt $stmt )

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 von mysqli_stmt_init() zurückgegebens Statementobjekt.

Rückgabewerte

Returns a result object or FALSE if an error occurred.

Beispiele

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$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();

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$link = mysqli_connect("localhost", "my_user", "my_password", "test"); mysqli_query($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_STMT PHP Manual