PHP Manual: Returns the number of columns in the result set

Description

public int PDOStatement::columnCount ( void )

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.

Return Values

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.

Examples

Example #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");

?>

The above example will output:

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

PDOStatement::columnCount

Description

Return Values

Examples

See Also