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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:
mixed mysqli_stmt_result_metadata ( object stmt)
</BR >
Object oriented style (method):
class stmt {
</BR >mixed result_metadata ( void )
</BR >}
If a statement passed to function.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.
Anmerkung: This result set pointer can be passed as an argument to any of the field-based functions that process result set metadata, such as: <P >
</P >
The result set structure should be freed when you are done with it, which you can do by passing it to function.mysqli-free-result
Anmerkung: 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 function.mysqli-fetch.
Return values
mysqli_stmt_result_metadata() returns a result object or FALSE if an error occured.
Example
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();
?> |
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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);
?> |
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