因为我只能通过一个php脚本使用webhoster的db，所以我想知道我是如何建立到这个脚本的连接的
PHP：

<?php
$query=$_POST["query"];
echo" Query = ".$query."\n";
if($query){
    $link=mysql_connect("localhost:3306","user","password");
    if($link){
        mysql_select_db("learnEng");
        $result=mysql_query($query);
        if($result){
            while($row=mysql_fetch_row($result)){
                foreach($row as $value){ 
                    echo "\t".$value;
                }
                echo"\n";
            }
        }
    }else{
        echo " MySQL connect failed ! \n";
    }
}else{
    echo " No Query ! \n";
}
exit();
?>

目前，我正在使用java进行db连接，如下所示（使用h2）：

Connection conn = null;

    String db = "~/testDB";
    String dbUser = "user";
    String dbPass = "password";

    Class.forName("org.h2.Driver");
    conn = DriverManager.getConnection("jdbc:h2:tcp://"+h2IP+"/" + db, dbUser, dbPass);

经过进一步研究，我发现：

HttpURLConnection conn=null;
    try{
        URL url=new URL("http://www.example.net/database.php");
        String agent="Applet";
        String query="query=" + "create table test(name varchar(255), id int);";
        String type="application/x-www-form-urlencoded";
        conn=(HttpURLConnection)url.openConnection();
        conn.setDoInput(true);
        conn.setDoOutput(true);
        conn.setRequestMethod("POST");
        conn.setRequestProperty( "User-Agent", agent );
        conn.setRequestProperty( "Content-Type", type );
        conn.setRequestProperty( "Content-Length", ""+query.length());

        OutputStream out=conn.getOutputStream();
        out.write(query.getBytes());
        BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        String inputLine;
        while((inputLine=in.readLine())!=null){
            System.out.print(inputLine+"\n");
        };
        in.close();
        int rc = conn.getResponseCode();
        System.out.print("Response Code = "+rc+"\n");
        String rm=conn.getResponseMessage();
        System.out.print("Response Message = "+rm+"\n");
    }catch(Exception e){
        e.printStackTrace();
    }finally{
        conn.disconnect();
    }

执行之后，我在eclipse控制台中通过上面的php代码得到以下响应：

Query = 
 No Query ! 
Response Code = 200
Response Message = OK

有人能告诉我发生了什么事，以及如何让它工作吗？
谨致问候