|
Последние активные темы форума |
|
PDOStatement::columnCount
(no version information, might be only in CVS) PDOStatement::columnCount --
Returns the number of columns in the result set
Описаниеint PDOStatement::columnCount ( void ) Внимание |
Эта функция является ЭКСПЕРИМЕНТАЛЬНОЙ.
Поведение этой функции, ее имя и относящаяся к ней документация
могут измениться в последующих версиях PHP без уведомления.
Используйте эту функцию на свой страх и риск. |
Use PDOStatement::columnCount() to return the number
of columns in the result set represented by the PDOStatement object.
If the PDOStatement object was returned from PDO::query(),
the column count is immediately available.
If the PDOStatement object was returned from
PDO::prepare(), an accurate column count will not be
available until you invoke PDOStatement::execute().
Возвращаемые значенияReturns the number of columns in the result set represented by the
PDOStatement object. If there is no result set,
PDOStatement::columnCount() returns 0.
Примеры
Пример 1. Counting columns This example demonstrates how PDOStatement::columnCount()
operates with and without a result set.
<?php
$dbh
= new
PDO
(
'odbc:sample'
,
'db2inst1'
,
'ibmdb2'
);
$sth
=
$dbh
->
prepare
(
"SELECT name, colour FROM fruit"
);
/* Count the number of columns in the (non-existent) result set */
$colcount
=
$sth
->
columnCount
();
print(
"Before execute(), result set has $colcount columns (should be 0)
\n
"
);
$sth
->
execute
();
/* Count the number of columns in the result set */
$colcount
=
$sth
->
columnCount
();
print(
"After execute(), result set has $colcount columns (should be 2)
\n
"
);
?>
|
Результат выполнения данного примера: Before execute(), result set has 0 columns (should be 0)
After execute(), result set has 2 columns (should be 2) |
|
Смотрите такжеPDO::prepare() | PDOStatement::execute() | PDOStatement::rowCount() |
|