php示例代码之使用mysqli对象

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<?php

  //连接参数

  $host="localhost";

  $user="root";

  $pwd="111111";

  $db="test";

  $mysqli =new mysqli($host,$user,$pwd,$db); //实例化一个mysqli对象,并打开一个连接

  if(mysqli_connect_errno()){ //检查是否可以正确打开数据库

    echo "<font color=‘red‘>unable to connect!</font>";

  }

  $SQL_SELECT_SYMBOLS="select * from symbols";

  if($result=$mysqli->query($SQL_SELECT_SYMBOLS)){

     if($result->num_rows>0){

        echo ‘<table cellpadding="10" border="1">‘;

        echo ‘<tr><th>id</th><th>country</th><th>animal</th><th>cname</th></tr>‘;

        while($arr=$result->fetch_array()){

            echo "<tr>";

            echo "<td>".$arr[0]."</td>";

            echo "<td>".$arr[1]."</td>";

            echo "<td>".$arr[2]."</td>";

            echo "<td>".$arr[3]."</td>";

            echo "</tr>";

        }

         echo "</table>";

    }

   else{

    echo "记录未找到!";

   }

  $result->close(); //释放记录集所占用的内存

  }

  else{

    echo "error in query:$query.".$mysqli->error;

  }

  $mysqli->close(); //关闭数据库连接

?>