php_DBHelper

<?php
class DBHelper{
private $host="localhost";
private $userName="root";
private $pwd="root";
private $DBName="mytest";
/**
 * 获取数据
 */
function GetQuery($sql){
    $conn=new mysqli($this->host,$this->userName,$this->pwd,$this->DBName);
    if(!$conn){
        echo "conn mysql error";
        mysqli_close($conn);
        return;
    }
    mysqli_query($conn,"set names utf8");
    $return=mysqli_query($conn,$sql);
    mysqli_close($conn);
    return $return;
}
/**
 * 增删修函数
 */
function NOQuery($sql){
    $conn=new mysqli($this->host,$this->userName,$this->pwd,$this->DBName);
    if(!$conn){
        echo "conn mysql error";
        mysqli_close($conn);
        return;
    }
    mysqli_query($conn,"set names utf8");
    mysqli_query($conn,$sql);
    //获取操作行数
    $rows=mysqli_affected_rows($conn);
    mysqli_close($conn);
    return $rows;//别忘记$符号
}

}
#开始执行测试
$db=new DBHelper();
#添加数据
// $db->NOQuery("insert into users values(0,'damo','11','易筋经')");
#修改数据
// $db->NOQuery("update users set userName='达摩' where userName='damo'");
#删除数据
// $db->NOQuery("delete from users where userName='达摩'");
$result=$db->GetQuery("select * from users");
?>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<table class="table table-hover table-bordered">
    <tr class="info">
        <th>编号</th>
        <th>用户名</th>
        <th>密码</th>
        <th>爱好</th>
    </tr>
    <?php foreach ($result as $rows) {?>
        <tr>
            <td><?php echo $rows["id"]?></td>
            <td><?php echo $rows["userName"]?></td>
            <td><?php echo $rows["passWord"]?></td>
            <td><?php echo $rows["likes"]?></td>
        </tr>
    <?php }?>
</table>