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简单介绍下PHP5中引入的MySQLI

  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,如下图:    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(DBMS)的发展步伐,加入新的特性的支持,以及适应MYSQL(DBMS)以后的版本。所以诞生了mysqli.dll    mysqli.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:    <?php    /* 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)    São Paulo (9968485)    Shanghai (9696300)    Jakarta (9604900)    2.使用内置OO接口方式调用:    <?php    /* 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。。。
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