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mysqli_stmt_result_metadata

(PHP 5)

mysqli_stmt_result_metadata -- Returns result set metadata from a prepared statement

Description

Procedural style:

mysqli_result mysqli_stmt_result_metadata ( mysqli_stmt stmt )

Object oriented style (method):

class mysqli_stmt {

mysqli_result result_metadata ( void )

}

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.

Notatka: 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()

Notatka: 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().

Zwracane wartości

mysqli_stmt_result_metadata() returns a result object or FALSE if an error occured.

Patrz także

mysqli_prepare() i mysqli_free_result().

Przykłady

Przykład 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();

                ?>

Przykład 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);

                ?>

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