Dual procedural and object-oriented interface

The mysqli extension features a dual interface. It supports the procedural and object-oriented programming paradigma.

Users stepping up from the old mysql extension may prefer the procedural interface. The procedural interface is similar to that of the mysql extension. In many cases function names differ only by prefix. Some mysqli functions take a connection handle as their first argument, whereas matching functions in the old mysql interface take it as an optional last argument.

Пример #1 Easy migration from the old mysql extension


<?php
$mysqli = mysqli_connect("example.com", "user", "password", "database");
$res = mysqli_query($mysqli, "SELECT 'Please, do not use ' AS _msg FROM DUAL");
$row = mysqli_fetch_assoc($res);
echo $row['_msg'];

$mysql = mysql_connect("localhost", "root", "");
mysql_select_db("test");
$res = mysql_query("SELECT 'the mysql extension for new developments.' AS _msg FROM DUAL", $mysql);
$row = mysql_fetch_assoc($res);
echo $row['_msg'];
?>

Результат выполнения данного примера:

Please, do not use the mysql extension for new developments.

The object-oriented interface

In addition to the classical procedural interface, users can choose to use the object-oriented interface. The documentation is organized using the object-oriented interface. The object-oriented interface shows functions grouped by their purpose, making it easier to get started. The reference section gives examples for both syntax variants.

There are no significant performance differences between the two interfaces. Users can base their choice on personal preference.

Пример #2 Object-oriented and procedural interface


<?php
$mysqli = mysqli_connect("example.com", "user", "password", "database");
if (mysqli_connect_errno($mysqli))
 echo "Failed to connect to MySQL: " . mysqli_connect_error();

$res = mysqli_query($mysqli, "SELECT 'A world full of ' AS _msg FROM DUAL");
$row = mysqli_fetch_assoc($res);
echo $row['_msg'];

$mysqli = new mysqli("example.com", "user", "password", "database");
if ($mysqli->connect_errno)
 echo "Failed to connect to MySQL: " . $mysqli->connect_error;

$res = $mysqli->query("SELECT 'choices to please everybody,' AS _msg FROM DUAL");
$row = $res->fetch_assoc();
echo $row['_msg'];
?>

Результат выполнения данного примера:

A world full of choices to please everybody.

The object oriented interface is used for the quickstart because the reference section is organized that way.

Mixing styles

It is possible to switch between styles at any time. Mixing both styles is not recommended for code clarity and coding style reasons.

Пример #3 Bad coding style


<?php
$mysqli = new mysqli("example.com", "user", "password", "database");
if ($mysqli->connect_errno)
 echo "Failed to connect to MySQL: " . $mysqli->connect_error;

$res = mysqli_query($mysqli, "SELECT 'Possible but bad style.' AS _msg FROM DUAL");
if (!$res)
 echo "Failed to run query: (" . $mysqli->errno . ") " . $mysqli->error;

if ($row = $res->fetch_assoc())
 echo $row['_msg'];
?>

Результат выполнения данного примера:

Possible but bad style.

See also