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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

Descrição

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().

Parâmetros

Esta função não possui parâmetros.

Valor Retornado

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.

Exemplos

Exemplo #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");

?>

O exemplo acima irá imprimir:

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

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User Contributed Notes 1 note

up
-17
756567406 at qq dot com
4 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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