PDOStatement::columnCount
(no version information, might be only in CVS)
PDOStatement::columnCount --
Returns the number of columns in the result set
Описание
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().
Возвращаемые значения
Returns the number of columns in the result set represented by the
PDOStatement object. If there is no result set,
PDOStatement::columnCount() returns 0.
Примеры
Пример 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");
?>
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Результат выполнения данного примера: Before execute(), result set has 0 columns (should be 0)
After execute(), result set has 2 columns (should be 2) |
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Смотрите также
| PDO::prepare() |
| PDOStatement::execute() |
| PDOStatement::rowCount() |