php连接mysql，数据CRUD操作

插入数据

<?php
    $name = $_GET['username'];
    $sex = $_GET['sex'];
    $hobby = $_GET['hobby'];
    $address = $_GET['address'];
    $remark = $_GET['remark'];
 
    $conn = mysqli_connect("localhost","root","root","exercise");
    if ($conn){
        $sql = "INSERT INTO info(姓名,性别,爱好,家庭住址,备注) VALUES ('$name','$sex','$hobby','$address','$remark')";
        if (mysqli_query($conn,$sql) === true) {
            echo "新纪录插入成功";
        } else {
            echo "新剧路插入失败".mysqli_error($conn);
        }
        mysqli_close($conn);
    }else{
        die("连接数据库失败：" . mysqli_error());
    }
?>

遍历表中所有数据

 $conn = mysqli_connect("localhost","root","root","exercise");
    if ($conn){      
          $result=mysqli_query($conn,"select * from info");
          while($myrow=mysqli_fetch_row($result)) {
              echo "<tr><td>$myrow[0]</td><td>$myrow[1]</td><td>$myrow[2]</td><td>$myrow[3]</td>
                 <td>$myrow[4]</td><td><a href='#'>修改</a>&nbsp<a href='#'>删除</a></td></tr>";
          }
        mysqli_close($conn);
    }else{
        die("连接数据库失败：" . mysqli_error());
    }