与Mysqli相关的四种数据库取值

<!--取值方案一：通过数字数组 fetch_row()--><meta http-equiv="Content-Type" content="text/html" charset="utf-8"><?php/** * Created by PhpStorm. * User: Administrator * Date: 2015/8/27 * Time: 11:00 */

//数据库连接$_mysqli=new mysqli(‘localhost‘,‘root‘,‘******‘,‘testguest‘);

//设置编码$_mysqli->set_charset(‘utf8‘);

//创建SQL语句$_sql="SELECT * FROM tg_user";

//执行SQL语句，并将结果集赋值给$_result$_result=$_mysqli->query($_sql);

//索引数组(第一行的信息)$_row=$_result->fetch_row();echo $_row[3];

//索引整个表的信息while(!!$_row=$_result->fetch_row()){    echo $_row[3].‘<br/>‘;}

//销毁结果集$_result->free();

//数据库断开$_mysqli->close();

?> 

<!--取值方案二：通过关联数组 fetch_assoc()--><meta http-equiv="Content-Type" content="text/html" charset="utf-8"><?php/** * Created by PhpStorm. * User: Administrator * Date: 2015/8/27 * Time: 11:18 *///数据库连接$_mysqli=new mysqli(‘localhost‘,‘root‘,‘******‘,‘testguest‘);

//设置编码$_mysqli->set_charset(‘utf8‘);

//创建SQL语句$_sql="SELECT * FROM tg_user";

//执行SQL语句，并将结果集赋值给$_result$_result=$_mysqli->query($_sql);

//索引数组(第一行的信息)$_assoc=$_result->fetch_assoc();echo $_assoc[‘tg_username‘].‘<br/><br/>‘;

//索引整个表的信息while(!!$_assoc=$_result->fetch_assoc()){    echo $_assoc[‘tg_username‘].‘<br/>‘;}

//销毁结果集$_result->free();

//数据库断开$_mysqli->close();?> 

<!--取值方案三：通过 关联+数字数组 fetch_array()--><meta http-equiv="Content-Type" content="text/html" charset="utf-8"><?php/** * Created by PhpStorm. * User: Administrator * Date: 2015/8/27 * Time: 11:39 */$_mysqli=new mysqli(‘localhost‘,‘root‘,‘******‘,‘testguest‘);

if(mysqli_connect_errno()){    echo ‘数据库连接错误，错误信息：‘.mysqli_connect_error();    exit();}

//设置编码$_mysqli->set_charset(‘utf8‘);

$_sql=‘SELECT * FROM tg_user‘;

$_result=$_mysqli->query($_sql);

//打印第一条信息//print_r($_result);$_array=$_result->fetch_array();echo $_array[3].‘<br/>‘;echo $_array[‘tg_username‘].‘<br/>‘;

//遍历while(!!$_array=$_result->fetch_array()){    echo $_array[3].‘<br/>‘;    echo $_array[‘tg_username‘].‘<br/>‘;}

$_result->free();$_mysqli->close();?> 

<!--取值方案四：通过面向对象（OOP） fetch_object()--><meta http-equiv="Content-Type" content="text/html" charset="UTF-8"><?php/** * Created by PhpStorm. * User: Administrator * Date: 2015/8/27 * Time: 11:54 */$_mysqli=new mysqli(‘localhost‘,‘root‘,‘******‘,‘testguest‘);

if(mysqli_connect_errno()){    echo ‘数据库连接错误，错误信息是：‘.mysqli_connect_error();    exit();}

//设置数据库编码$_mysqli->set_charset(‘utf8‘);

$_sql=‘SELECT * FROM tg_user‘;

$_result=$_mysqli->query($_sql);

$_object=$_result->fetch_object();echo $_object->tg_username.‘<br/>‘;

//遍历while(!!$_object=$_result->fetch_object()){    echo $_object->tg_username.‘<br/>‘;}

$_result->free();$_mysqli->close();?>