PHP Dokumentation: Function maxdb-stmt-result-metadata
12. Januar 2010 von werner
maxdb_stmt_result_metadata
(PECL maxdb >= 1.0)
maxdb_stmt_result_metadata — Returns result set metadata from a prepared statement
Beschreibung
Procedural style:
Object oriented style (method):
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.
Hinweis: 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 maxdb_free_result()
Hinweis: 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().
Rückgabewerte
maxdb_stmt_result_metadata() returns a result resource or FALSE if an error occured.
Beispiele
Beispiel #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();
?>Beispiel #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);
?>Das oben gezeigte Beispiel erzeugteine ähnliche Ausgabe wie:
Fieldname: ID
Siehe auch
- maxdb_prepare() – Prepare a SQL statement for execution
- maxdb_free_result() – Frees the memory associated with a result
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