mysql数据库连接mysql_connect()函数的使用方法

mysql教程数据库教程连接mysql_connect()函数的使用方法

定义和用法
mysql_connect() 函数打开非持久的 MySQL 连接。

语法
mysql_connect(server,user,pwd,newlink,clientflag)

resource mysql_connect ( [string server [, string username [, string password [, bool new_link [, int client_flags]]]]] )

<?php教程
try {
    $mysqlhost = "localhost";
    $mysqluser = "root";
    $mysqlpass = "";
    if ($db = mysql_connect ($mysqlhost,$mysqluser,$mysqlpass)){
        echo "Successfully connected to the database.";
        mysql_close ($db);
   
    } else {
        throw new exception ("Sorry, could not connect to mysql.");
    }
} catch (exception $e) {
echo $e->getmessage ();
}
?>

提示和注释
注释：脚本一结束，到服务器的连接就被关闭，除非之前已经明确调用 mysql_close() 关闭了。

提示：要创建一个持久连接，请使用 mysql_pconnect() 函数。

连接mysql数据库再详细的查查询代码

<?php
  function opendatabase ($host,$user,$pass) {
    try {
      if ($db = mysql_connect ($host,$user,$pass)){
        return $db;
      } else {
        throw new exception ("Sorry, could not connect to mysql.");
      }
    } catch (exception $e) {
      echo $e->getmessage ();
    }
  }
 
  function closedatabase ($db){
    mysql_close ($db);
  }
 
  $db = opendatabase ("localhost","root","");
 
  try {
    if (!mysql_select_db ("mydatabase",$db)){
      throw new exception ("Sorry, database could not be opened.");
    }

      $myquery = "INSERT INTO mytable (id,title,myvalue) VALUES (0,'Blue',20)";
 
    if (mysql_query ($myquery, $db)){
      echo "We were successful.";
    } else {
      throw new exception (mysql_error());
    }
  } catch (exception $e) {
    echo $e->getmessage();
  }
 
  closedatabase ($db);
 
?>