mysqli_field_count

(PHP 5)

mysqli_field_count

mysqli->field_count - Возвращает количество столбцов для последнего запроса.

Процедурный стиль вызова:

int mysqli_field_count ( mysqli link )

Объектно-ориентированный стиль вызова (method):

class mysqli_result {
int field_count ( void )
}

Returns the number of columns for the most recent query on the connection represented by the link parameter. This function can be useful when using the mysqli_store_result() function to determine if the query should have produced a non-empty result set or not without knowing the nature of the query.

Возвращаемые значения

An integer representing the number of fields in a result set

Примеры

Пример 1. Объектно-ориентированный стиль вызова

$mysqli = new mysqli("localhost", "my_user", "my_password", "test");

$mysqli->query( "DROP TABLE IF EXISTS friends"); 
$mysqli->query( "CREATE TABLE friends (id int, name varchar(20))"); 

$mysqli->query( "INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");


$mysqli->real_query($HTTP_POST_VARS['query']);

if ($mysqli->field_count) {
    /* this was a select/show or describe query */
    $result = $mysqli->store_result();

    /* process resultset */
    $row = $result->fetch_row();

    /* free resultset */
    $result->close();
}

/* close connection */
$mysqli->close();

Пример 2. Процедурный стиль вызова

$link = mysqli_connect("localhost", "my_user", "my_password", "test");

mysqli_query($link, "DROP TABLE IF EXISTS friends"); 
mysqli_query($link, "CREATE TABLE friends (id int, name varchar(20))"); 

mysqli_query($link, "INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");

mysqli_real_query($link, $HTTP_POST_VARS['query']);

if (mysqli_field_count($link)) {
    /* this was a select/show or describe query */
    $result = mysqli_store_result($link);

    /* process resultset */
    $row = mysqli_fetch_row($result);

    /* free resultset */
    mysqli_free_result($result);
}

/* close connection */
mysqli_close($link);

Смотрите также:
Все функции mysql
Описание на ru2.php.net
Описание на php.ru