mysqli_stmt::result_metadata

mysqli_stmt_result_metadata

(PHP 5)

mysqli_stmt_result_metadata — Returns result set metadata from a prepared statement

Description

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.

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

mysqli_num_fields()

mysqli_fetch_field()

mysqli_fetch_field_direct()

mysqli_fetch_fields()

mysqli_field_count()

mysqli_field_seek()

mysqli_field_tell()

mysqli_free_result()

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

Note: 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().

Parameters

stmt: Procedural style only: A statement identifier returned by mysqli_stmt_init().

Return Values

Returns a result object or FALSE if an error occured.

Examples

Example #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();

?>

Example #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);

?>