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mysqli_stmt_result_metadata (PHP 5) mysqli_stmt_result_metadata -- Returns result set metadata from a prepared statement DescriptionProcedural 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.
注: 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()
注:
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().
返回值
mysqli_stmt_result_metadata() returns a result object or FALSE if
an error occured.
范例
例子 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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例子 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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