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Dokumen ini menggunakan Manual laman web PHP Cina Lepaskan
(PECL mysqlnd-uh >= 1.0.0-alpha)
MysqlndUhConnection::getFieldCount — Returns the number of columns for the most recent query
$connection
)Returns the number of columns for the most recent query.
connection
Mysqlnd connection handle. Do not modify!
Number of columns.
MysqlndUhConnection::getFieldCount() is not only executed after the invocation of a user space API call which maps directly to it but also called internally.
Example #1 MysqlndUhConnection::getFieldCount() example
<?php
class proxy extends MysqlndUhConnection {
public function getFieldCount ( $res ) {
printf ( "%s(%s)\n" , __METHOD__ , var_export ( func_get_args (), true ));
$ret = parent :: getFieldCount ( $res );
printf ( "%s returns %s\n" , __METHOD__ , var_export ( $ret , true ));
return $ret ;
}
}
mysqlnd_uh_set_connection_proxy (new proxy ());
$mysqli = new mysqli ( "localhost" , "root" , "" , "test" );
$mysqli -> query ( "WILL_I_EVER_LEARN_SQL?" );
var_dump ( $mysqli -> field_count );
$mysqli -> query ( "SELECT 1, 2, 3 FROM DUAL" );
var_dump ( $mysqli -> field_count );
?>
以上例程会输出:
proxy::getFieldCount(array ( 0 => NULL, )) proxy::getFieldCount returns 0 int(0) proxy::getFieldCount(array ( 0 => NULL, )) proxy::getFieldCount returns 3 proxy::getFieldCount(array ( 0 => NULL, )) proxy::getFieldCount returns 3 int(3)