php中的连接mysql驱动类

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  PHP mysqli是设置链接MySQL数据库

  1. 开启PHP的API支持

  (1)首先修改您的php.ini的配置文件。

  查找下面的语句:

  ;extension=php_mysqli.dll

  将其修改为:

  extension=php_mysqli.dll

  (2)重新启动Apache/IIS,即可。

  (3)说明:PHP需要单独的文件来支持这个扩展库,一般在PHP目录下的ext目录里能找到php_mysqli.dll文件(PHP <= 5.0.2 中是 libmysqli.dll),当然,在PHP的配置文件当中要有正确指向ext的信息(extension_dir)。假若您的PHP没有这个文件,您可以去下载PHP5的源码包。另外,这个API扩展,只能在PHP5以上版本使用。其它具体信息,请看下面。

  2.PHP mysqli身份证

  mysqli是“MySQL, Improved”的缩写,该扩展仅适用于PHP 5。它能用于MySQL 4.1.1和更高版本。该扩展完全支持MySQL 5.1中采用的鉴定协议,也支持预处理语句和多语句API。此外,该扩展还提供了先进的、面向对象的编程接口。

  3. mysqli预定义类

  mysqli

  表达了 PHP 和 MySQL 数据库之间的连接。

  构造函数

  mysqli - 构造一个新的PHP mysqli对象

  方法

  autocommit - 打开或关闭自动提交的数据库选项

  change_user - 改变指定的数据库连接的用户

  character_set_name - 返回数据库连接的默认字符集

  close - 关闭一个之前打开的连接

  commit - 提交当前事务

  connect - 打开一个到 MySQL 数据库服务器的新连接

  debug - 执行排错操作

  dump_debug_info - 取得排错信息

  get_client_info - 返回客户端版本

  get_host_info - 返回连接使用的类型

  get_server_info - 返回 MySQL 服务器的版本

  get_server_version - 返回 MySQL 服务器的版本

  init - 初始化PHP mysqli对象

  info - 取得最近执行的查询的信息

  kill - 要求服务器停止一个 mysql 线程

  multi_query - 执行多个查询

  more_results - check if more results exist from currently executed multi-query

  next_result - reads next result from currently executed multi-query

  options - set options

  ping - pings a server connection or reconnects if there is no connection

  prepare - prepares a SQL query

  query - performs a query

  real_connect - attempts to open a connection to MySQL database server

  escape_string - escapes special characters in a string for use in a SQL statement, taking into account the current charset of the connection

  rollback - rolls back the current transaction

  select_db - selects the default database

  set_charset - sets the default client character set

  ssl_set - sets ssl parameters

  stat - gets the current system status

  stmt_init- initializes a statement for use with mysqli_stmt_prepare

  store_result - transfers a resultset from last query

  thread_safe - returns whether thread safety is given or not

  use_result - transfers an unbuffered resultset from last query

  属性

  affected_rows - gets the number of affected rows in a previous MySQL operation

  client_info - returns the MySQL client version as a string

  client_version - returns the MySQL client version as an integer

  errno - returns the error code for the most recent function call

  error - returns the error string for the most recent function call

  field_count - returns the number of columns for the most recent query

  host_info - returns a string representing the type of connection used

  info - retrieves information about the most recently executed query

  insert_id - returns the auto generated id used in the last query

  protocol_version - returns the version of the MySQL protocol used

  server_info - returns a string that represents the server version number

  server_version - returns the version number of the server as an integer

  sqlstate - returns a string containing the SQLSTATE error code for the last error

  thread_id - returns the thread ID for the current connection

  warning_count - returns the number of warnings generated during execution of the previous SQL statement

  4. 基本语法

 
   /* Connect to  a MySQL  server

    $link = mysqlli_connect(

      'localhost', /* The host to connect to   连接MySQL地址 */

      'user'.,    /*The  user to connect as  连接数据库用户名 */

      'password', /*The password to use 链接数据库密码*/

       'word'); /* The  default datatbase  to query  连接数据库名称*/

    if(!$link){

     printf("Can't connect to MySQL  Server. Errorcode: %s", mysql_connect_error());

    }

    /* Send  a query  to the  server */

    if($result = mysqli_query($link,'select Name, Population FROM  City  ORDER BY Population  DESC  LIMIT 5'){

    printf("Very  large cities are:");

}
echo('http://www.feinews.net/')
  
?>

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