Retrieve statistics about a table

说明

odbc_statistics(
    resource $odbc,
    ?string $catalog,
    string $schema,
    string $table,
    int $unique,
    int $accuracy
): resource|false

Get statistics about a table and its indexes.

参数

odbc: ODBC 连接标识符，详见 odbc_connect()。
catalog: The catalog ('qualifier' in ODBC 2 parlance).
schema: The schema ('owner' in ODBC 2 parlance).
table: 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.

返回值

Returns an ODBC result identifier 或者在失败时返回 false.

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

Drivers can report additional columns.

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

范例

示例 #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
}
?>

以上例程的输出类似于：

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] =>
)

参见

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