PEAR Справочное руководство
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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.

Параметр

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

Возвращаемое значение

mixed - the returned value or a MDB_Error, if fail

Throws

Таблица 34-1. Возможные значения PEAR_Error

Error code	Error message	Reason	Solution
`MDB_ERROR_NO_DB_SELECTED`	`NULL`	No database was choosen.	Check the DSN in connect() .
every other error code		Database specific error	Check the database related section of PHP-Manual to detect the reason for this error. In the most cases a misformed SQL statment. Ie. using LIMIT in a SQL-Statment for an Oracle database.

Заметка

Эта функция не должна вызываться статически.

См. также

query() , limitQuery() , prepareQuery() , executeQuery() , queryRow() , queryCol() , queryCol()

Пред.	Начало	След.
MDB_Common::queryCol()	Уровень выше	MDB_Common::queryRow()

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