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PDOStatement::columnCount

(PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.2.0)

PDOStatement::columnCount — Returns the number of columns in the result set

Опис

public PDOStatement::columnCount(): int

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().

Параметри

У цієї функції немає параметрів.

Значення, що повертаються

Returns the number of columns in the result set represented by the PDOStatement object, even if the result set is empty. If there is no result set, PDOStatement::columnCount() returns 0.

Помилки/виключення

Видає помилку рівня E_WARNING, якщо атрибут PDO::ATTR_ERRMODE дорівнює PDO::ERRMODE_WARNING.

Викидає PDOException, якщо атрибут PDO::ATTR_ERRMODE дорівнює PDO::ERRMODE_EXCEPTION.

Приклади

Приклад #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";

?>

Поданий вище приклад виведе:

Before execute(), result set has 0 columns (should be 0)
After execute(), result set has 2 columns (should be 2)

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