PHP5中引入的MYSQLI详解

在新下载的PHP5中你会发现多了一个mysqli.dll，它是干什么用的呢？我简单介绍下：mysqli.dll是PHP对mysql新特性的一个扩展支持。在PHP5中可以在php.ini中加载，interface, ingenious, incompatible or incomplete（改扩展仍在开发中，因为MYSQL4。1和MYSQL5都没有正式推出尚在开发中，新的特性没有完全实现）?mysqli想实现的目标具体有：-更简单的维护-更好的兼容性-向后兼容mysql（指PHP中的模块）发展到现在显得比较凌乱，有必要重新做下整理。同时，有必要跟上MYSQL—BMS）的发展步伐，加入新的特性的支持，以及适应MYSQL—BMS）以后的版本。所以诞生了mysqli.dllmysqli.dll的特性：-可以和mysql.dll一样的方式使用-支持OO接口，简简单单调用-支持MYSQL4。1引入的新特性-通过mysqli_init() 等相关函数，可以设置高级连接选项mysqli的使用例子：1.和以前mysql.dll一样的方法：?/* Connect to a MySQL server */?$link = mysqli_connect(?'localhost', /* The host to connect to */?'user', /* The user to connect as */?'password', /* The password to use */?'world'); /* The default table to query */?if (!$link) {?printf("Can't connect to MySQL Server. Errorcode: %sn", mysqli_connect_error());?exit;?}?/* Send a query to the server */?if ($result = mysqli_query($link, 'SELECT Name, Population FROM City ORDER BY Population DESC LIMIT 5')) {?print("Very large cities are:n");?/* Fetch the results of the query */?while( $row = mysqli_fetch_assoc($result) ){?printf("%s (%s)n", $row['Name'], $row['Population']);?}?/* Destroy the result set and free the memory used for it */?mysqli_free_result($result);?}?/* Close the connection */?mysqli_close($link);??>??输出结果：?Very large cities are:Mumbai (Bombay) (10500000)Seoul (9981619)S?o Paulo (9968485)Shanghai (9696300)Jakarta (9604900)?2.使用内置OO接口方式调用：?/* Connect to a MySQL server */?$mysqli = new mysqli('localhost', 'user', 'password', 'world');?if (mysqli_connect_errno()) {?printf("Can't connect to MySQL Server. Errorcode: %sn", mysqli_connect_error());?exit;?}?/* Send a query to the server */?if ($result = $mysqli->query('SELECT Name, Population FROM City ORDER BY Population DESC LIMIT 5')) {?print("Very large cities are:n");?/* Fetch the results of the query */?while( $row = $result->fetch_assoc() ){?printf("%s (%s)n", $row['Name'], $row['Population']);?}?/* Destroy the result set and free the memory used for it */?$result->close();?}?/* Close the connection */?$mysqli->close();??>??支持的新特性还有：Bound Parameters，Bound Results等。?有兴趣的可以直接去参看原英文：http://www.heatpress123.net/cpzs/原文地址：http://www.software8.co/wzjs/PHPshili/1285.html