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

Descrizione

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().

Elenco dei parametri

Questa funzione non contiene parametri.

Valori restituiti

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.

Esempi

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");

?>

Il precedente esempio visualizzerĂ :

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

Vedere anche:

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User Contributed Notes 1 note

up
-17
756567406 at qq dot com
5 years ago
When you use query method, You'll get count right away

<?php
$dbh
= new PDO('odbc:sample', 'db2inst1', 'ibmdb2');

$sth = $dbh->query("SELECT name, colour FROM fruit");
$count = $sth->columnCount();

echo
'query count is '.$count;

?>
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