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# PDOStatement->columnCount

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

PDOStatement->columnCount — Returns the number of columns in the result set

### 설명

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().

### 반환값

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

### 예제

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");
?>`

위 예제의 출력:

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

### 참고

- PDO::prepare() - Prepares a statement for execution and returns a statement object
- PDOStatement::execute() - Executes a prepared statement
- PDOStatement::rowCount() - Returns the number of rows affected by the last SQL statement

PDOStatement->closeCursor
PDOStatement->debugDumpParams
PDOStatement
PHP Manual