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)
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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:
?
/* 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。
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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