Php/docs/pdostatement.columncount
PDOStatement::columnCount
(PHP 5 >= 5.1.0, PHP 7, PECL pdo >= 0.2.0)
PDOStatement::columnCount — Returns the number of columns in the result set
Description
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().
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)
See Also
- 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
