Php连接及读取和写入mysql数据库的常用代码
既然现在你看到了这篇文章,说明你肯定知道PHP和MySQL是怎么一回事,我就不啰嗦了。但为什么你还要继续阅读此文呢?可能是以前你习惯复制粘贴一些代码,并没有真
既然现在你看到了这篇文章,说明你肯定知道PHP和MySQL是怎么一回事,我就不啰嗦了。但为什么你还要继续阅读此文呢?可能是以前你习惯复制粘贴一些代码,并没有真正弄懂代码的含义;也可能你以前弄懂了,但像我一样,有一段时间没有接触,生疏了;再或者,,有人问你类似的简单问题,而你已经不屑于回答,直接上网搜索,恰好找到了这篇,于是就推荐给那谁谁谁了...
不管怎样,在这里我总结了常用的PHP连接MySQL数据库以及读取写入数据库的方法,希望能够帮到你,当然也是作为我自己的一个回顾总结。
1.为了更好地设置数据连接,一般会将数据连接所涉及的值定义成变量.
$mysql_server_name='localhost'; //改成自己的mysql数据库服务器 $mysql_username='root'; //改成自己的mysql数据库用户名 $mysql_password='123456'; //改成自己的mysql数据库密码 $mysql_database='Mydb'; //改成自己的mysql数据库名
也可把以上变量放在一个文件里,可以随时让其他文件调用.
例如: 将以上内容放在:db_config.php 那么在其他需要用到数据库的页面直接调用.
调用代码:require("db_config.php");
2.连接数据库
$conn=mysql_connect($mysql_server_name,$mysql_username,$mysql_password) or die("error connecting") ; //连接数据库 mysql_query("set names 'utf8'"); //数据库输出编码 应该与你的数据库编码保持一致.南昌网站建设公司百恒网络PHP工程师建议用UTF-8 国际标准编码. mysql_select_db($mysql_database); //打开数据库 $sql ="select * from news "; //SQL语句 $result = mysql_query($sql,$conn); //查询
3.读取表中的内容,这里我们用while,可以根据具体情况,用for 或其他的.
while($row = mysql_fetch_array($result)) { echo "
"; echo "
4.php写入数据库,Mysql数据的写入
$conn=mysql_connect($mysql_server_name,$mysql_username,$mysql_password); //连接数据库 mysql_query("set names 'utf8'"); //数据库输出编码 mysql_select_db($mysql_database); //打开数据库 $sql = "insert into messageboard (Topic,Content,Enabled,Date) values ('$Topic','$Content','1','2011-01-12')"; mysql_query($sql); mysql_close(); //关闭MySQL连接

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