Retrieve statistics about a table

Beschreibung

odbc_statistics ( resource $connection_id , string $catalog , string $schema , string $table_name , int $unique , int $accuracy ) : resource|false

Get statistics about a table and its indexes.

Parameter-Liste

connection_id: Eine ODBC-Verbindungsressource, siehe odbc_connect() für Details.
catalog: Der Katalog ('Kennzeichner' in ODBC 2 Terminologie).
schema: Das Schema ('Besitzer' in ODBC 2 Terminologie).
table_name: The table name.
unique: The type of the index. One of SQL_INDEX_UNIQUE or SQL_INDEX_ALL.
accuracy: One of SQL_ENSURE or SQL_QUICK. The latter requests that the driver retrieve the CARDINALITY and PAGES only if they are readily available from the server.

Rückgabewerte

Returns an ODBC result identifierIm Fehlerfall wird FALSE zurückgegeben..

The result set has the following columns:

TABLE_CAT
TABLE_SCHEM
TABLE_NAME
NON_UNIQUE
INDEX_QUALIFIER
INDEX_NAME
TYPE
ORDINAL_POSITION
COLUMN_NAME
ASC_OR_DESC
CARDINALITY
PAGES
FILTER_CONDITION

Treiber können zusätzliche Spalten melden.

The result set is ordered by NON_UNIQUE, TYPE, INDEX_QUALIFIER, INDEX_NAME and ORDINAL_POSITION.

Beispiele

Beispiel #1 List Statistics of a Table


<?php
$conn = odbc_connect($dsn, $user, $pass);
$statistics = odbc_statistics($conn, 'TutorialDB', 'dbo', 'TEST', SQL_INDEX_UNIQUE, SQL_QUICK);
while (($row = odbc_fetch_array($statistics))) {
    print_r($row);
    break; // further rows omitted for brevity
}
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

Array
(
    [TABLE_CAT] => TutorialDB
    [TABLE_SCHEM] => dbo
    [TABLE_NAME] => TEST
    [NON_UNIQUE] =>
    [INDEX_QUALIFIER] =>
    [INDEX_NAME] =>
    [TYPE] => 0
    [ORDINAL_POSITION] =>
    [COLUMN_NAME] =>
    [ASC_OR_DESC] =>
    [CARDINALITY] => 15
    [PAGES] => 3
    [FILTER_CONDITION] =>
)

Siehe auch

odbc_tables() - Get the list of table names stored in a specific data source