Question

我需要你的帮助。我有删除所有记录按钮，当我删除所有记录它工作正常，直到我尝试在删除所有后添加记录，当我尝试添加第二条记录时，第一条记录将被删除。我认为问题是因为我删除所有记录后从未关闭我的查询..我不能在我的代码中使用的确切语法。请帮帮我们。这是我删除所有的代码：

<?php
include_once 'connection.php';
$fname = $lname = $username = $phone = $email = $cemail = "";
$act="";
$txtid = 0;
if(isset($_GET['act'])){
    $act=$_GET['act'];

    if($act=='delete'){
        $id=$_GET['id'];
        $sql="delete from tbl_admin where id = $id";
        $result = mysqli_query($conn,$sql)or die(mysqli_error());
        if($result){
        }
    }

    if($act=='deleteall'){
        $sql="delete from tbl_admin";
        $result = mysqli_query($conn,$sql)or die(mysqli_error());
    }


    if($act=='edit'){
        $id=$_GET['id'];
        $sql="select * from tbl_admin where id = $id";
        $result = mysqli_query($conn,$sql)or die(mysqli_error());
        while($row = mysqli_fetch_array($result)){
            $txtid = $row['id'];
            $fname = $row['fname'];
            $lname = $row['lname'];
            $username = $row['username'];
            $phone = $row['mobileNo'];
            $email = $row['email'];
        }

    }

    if(isset($_POST['add'])){
        // fname validate
        if(empty($_POST["fname"])){
            echo '<script> alert("first name is empty!"); </script>';
        }else{
            $fname = test_input($_POST["fname"]);
            // lname validate
            if(empty($_POST["lname"])){
                echo '<script> alert("last name is empty!"); </script>';
            }else{
                $lname = test_input($_POST["lname"]);
                //username
                if(empty($_POST["username"])){
                    echo '<script> alert("username is empty!"); </script>';
                }else{
                    $username = test_input($_POST["username"]);
                    //phone
                    if(empty($_POST["phone"])){
                        echo '<script> alert("mobile number is empty!!"); </script>';
                    }else{
                        $phone = test_input($_POST["phone"]);
                        //email
                        if(empty($_POST["email"])){
                            echo '<script> alert("email is empty!"); </script>';
                        }else{
                            $email = test_input($_POST["email"]);
                            //cemail
                            if(empty($_POST["cemail"])){
                                echo '<script> alert("confirm email is empty!"); </script>';
                            }else{
                                $cemail = test_input($_POST["cemail"]);
                                if($email != $cemail){
                                    echo '<script> alert("Confirm Email!"); </script>';
                                }else{
                                    $sql= "insert into tbl_admin(fname,lname,username,password,mobileNo,email,add_date) values('$fname','$lname','$username','123abc','$phone','$email',NOW())";
                                    $result = mysqli_query($conn,$sql)or die(mysqli_error());
                                    if($result){
                                        echo '<script> alert("Successfully add admin user."); </script>';
                                        $fname = $lname = $username = $phone = $email = $cemail = "";
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }

    if(isset($_POST['update'])){
        if(empty($txtid)){
            echo '<script>
                    alert("Select record to Update!");
                </script>';
        }else{
            echo '<script>
                    alert("you can update record..");
                </script>';
                $fname = $lname = $username = $phone = $email = $cemail = "";

        }
    }

    function test_input($data){
        $data = trim($data);
        $data = stripslashes($data);
        $data = htmlspecialchars($data);
        return $data;
    }

    ?>

Answer 1

因为所有代码都存在于此if语句

中

if(isset($_GET['act'])){

然后我们必须假设$_GET['act'] 始终设置为

由于$_GET['act']始终设置为某项，因此DELETE代码正在运行始终。其delete或deleteall

重建网页的代码仍然缺失，但基本上您需要更加逻辑地组织代码，并确保仅在您确实要执行删除时才设置$_GET['act'] < / strong>，这可能意味着更改HTML，因此不会被设置。

Answer 2

我猜这些方法与mysql中的方法相同（没有i）

http://php.net/manual/en/mysqli-result.free.php

采用非面向对象的方式

mysqli_free_result($result);

为什么我的代码会从数据库中删除第一行

2 个答案: