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mysqli_get_metadata (no version information, might be only in CVS) mysqli_get_metadata -- returns result set metadata from a prepared statement DescriptionProcedural style: mixed mysqli_get_metadata ( object stmt) Object oriented style (method): class stmt { mixed get_metadata ( void ) }
If a statement passed to mysqli_prepare() is one that produces a result set, mysqli_get_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:
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_get_metadata() contains only metadata. It does not contain any row results. The rows are obtained by using the statement handle with mysqli_fetch().
Return values
mysqli_get_metadata() returns a result object or FALSE if an error occured. Example
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->get_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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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_execute($stmt);
/* get resultset for metadata */
$result = mysqli_get_metadata($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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