MDB_Common::queryOne()
MDB_Common::queryOne() – fetch the first column of the first row
Synopsis
require_once 'MDB.php';
mixed &queryOne
(
string $query
,
string $type
= null
)
Описание
Fetch the first column of the first row of data returned from a query. The function takes care of doing the query and freeing the results when finished.
Parameter
-
string
$query -
the SQL query or the statement to prepare
-
string
$type -
if supplied, the type of the cell in the result set will be set for fetching
Return value
mixed - the returned value or
a MDB_Error, if fail
Throws
| Error code | Error message | Reason | Solution |
|---|---|---|---|
| MDB_ERROR_NO_DB_SELECTED | NULL | No database was chosen. | Check the DSN in connect() . |
| every other error code | Database specific error | Check the database related section of PHP-Руководство to detect the reason for this error. In the most cases a misformed SQL statement. Ie. using LIMIT in a SQL-Statement for an Oracle database. |
Замечание
This function can not be called statically.
See
query() , limitQuery() , prepareQuery() , executeQuery() , queryRow() , queryCol() , queryCol()