maxdb_stmt_result_metadata

(PECL maxdb >= 1.0)

maxdb_stmt_result_metadata — Returns result set metadata from a prepared statement

Описание

Procedural style:

resource maxdb_stmt_result_metadata ( resource $stmt )

Object oriented style (method):

stmt

resource result_metadata ( void )

If a statement passed to maxdb_prepare() is one that produces a result set, maxdb_stmt_result_metadata() returns the result resource that can be used to process the meta information such as total number of fields and individual field information.

Замечание: This result set pointer can be passed as an argument to any of the field-based functions that process result set metadata, such as:

maxdb_num_fields()

maxdb_fetch_field()

maxdb_fetch_field_direct()

maxdb_fetch_fields()

maxdb_field_count()

maxdb_field_seek()

maxdb_field_tell()

maxdb_free_result()

The result set structure should be freed when you are done with it, which you can do by passing it to maxdb_free_result()

Замечание: The result set returned by maxdb_stmt_result_metadata() contains only metadata. It does not contain any row results. The rows are obtained by using the statement handle with maxdb_fetch().

Возвращаемые значения

maxdb_stmt_result_metadata() returns a result resource or FALSE if an error occured.

Примеры

Пример #1 Object oriented style


<?php
$maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB");

$maxdb->query("CREATE TABLE temp.friends (id int, name varchar(20))");

$maxdb->query("INSERT INTO temp.friends VALUES (1,'Hartmut')");
$maxdb->query("INSERT INTO temp.friends VALUES (2, 'Ulf')");

$stmt = $maxdb->prepare("SELECT id, name FROM temp.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 */
$maxdb->close();
?>

Пример #2 Procedural style


<?php
$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");

maxdb_query($link, "CREATE TABLE temp.friends (id int, name varchar(20))");

maxdb_query($link, "INSERT INTO temp.friends VALUES (1,'Hartmut')");
maxdb_query($link, "INSERT INTO temp.friends VALUES (2, 'Ulf')");

$stmt = maxdb_prepare($link, "SELECT id, name FROM temp.friends");
maxdb_stmt_execute($stmt);

/* get resultset for metadata */
$result = maxdb_stmt_result_metadata($stmt);

/* retrieve field information from metadata result set */
$field = maxdb_fetch_field($result);

printf("Fieldname: %s\n", $field->name);

/* close resultset */
maxdb_free_result($result);

/* close connection */
maxdb_close($link);
?>

Результатом выполнения данного примера будет что-то подобное:

Fieldname: ID

Смотрите также

maxdb_prepare() - Prepare a SQL statement for execution
maxdb_free_result() - Frees the memory associated with a result