Returns result set metadata from a prepared statement

# mysqli_stmt::result_metadata

# mysqli_stmt_result_metadata

(PHP 5, PHP 7)

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

### Descrierea

Stil obiect-orientat

mysqli_stmt::result_metadata ( void ) : mysqli_result

Stil procedural

mysqli_stmt_result_metadata ( mysqli_stmt `$stmt` ) : mysqli_result

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.

> Notă:

> 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()

> Notă:

> 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().

### Parametri

`stmt`

  Numai stilul procedural: Un identificator al declarației întors de mysqli_stmt_init().

### Valorile întoarse

Returns a result object or `FALSE` if an error occurred.

### Exemple

Example #1 Stil obiect-orientat

`<?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 Stil procedural

`<?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);
?>`

### A se vedea și

- mysqli_prepare() - Prepare an SQL statement for execution
- mysqli_free_result() - Frees the memory associated with a result