preface

In PHP connect MySQL database to add delete to check. We created the MySQL data database and created the news table in the database. And the use of PHP for connection, we will be based on this further application.

A, modules,

1.1 Included Files

Since all operations are connected to the database, put the code to connect to the database in the include file.

Steps:

Create the inc folder under the WWW folder:

Create the conn.php file under Inc to connect to the database.

Connect to database:


      
    $link=mysqli_connect('localhost'.'root'.'123456'.'data') or die(Error:.mysqli_connect_error());
    mysqli_set_charset($link.'utf8');
? >
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Second, data operation

2.1 Display Data

Steps:

Connecting to the database
To get the data
Iterate over the loop data

Code:

<! DOCTYPE html> <html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="Width = device - width, initial - scale = 1.0">
    <title>Document</title>
    <style>
        table {
            width: 780px;
            border: 1px solid # 000;
            margin: auto;
        }
        th,td {
            border: 1px solid # 000;
        }
    </style>
</head>
<body>
    
    
      
        // 1. Connect to the database
        require './inc/conn.php';

        // 2. Obtain data
        $resultSets=mysqli_query($link.'select * from news'); # Return result set object
        $list=mysqli_fetch_all($resultSets, MYSQLI_ASSOC);
        // print_r($list); # Match the result to an associative array
    ? >
    <a href="./add.php"News > add < / a > < table > < tr > < th > id < / th > < th > name < / th > < th > skills < / th > < th > time < / th > < th > change < / th > < th > delete < / th >
       foreach($list as $rows) :? >
                <tr>
                    <td>
       echo $rows['id']; ? ></td>
                    <td>
       echo $rows['title']; ? ></td>
                    <td>
       echo $rows['content']; ? ></td>
                    <td>
       echo date('Y-m-d H:i:s'.$rows['createtime']); ? ></td>
                    <td><input type="button" value="Change"></td>
                    <td><input type="button" value="Delete" ></td>
                </tr>
            
       endforeach;? >
        </tr>
    </table>
</body>
</html>
Copy the code

Effect:

2.2 Adding Data

Create a new add.php folder in the WWW folder. Steps:

Create a form
Connecting to the database
Write data to the database

Code:

<! DOCTYPE html> <html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="Width = device - width, initial - scale = 1.0">
    <title>Document</title>
</head>
<body>

      
    if (!empty($_POST)) {
        // 2. Connect to the database
        require './inc/conn.php';
        $time = time();
        $sql = "insert into news values (null, '{$_POST['name']}', '{$_POST['content']}', $time)";
        // 3. Execute the SQL statement
        if (mysqli_query($link.$sql)) {
            header('location:./list.php'); 
        }
        else {
            echo Insert error, error code:.mysqli_errno($link),'<br/>';
            echo Error message:.mysqli_error($link); }}? ><! --1Create form --> <form action="" method="post"<input type="text" name="name"<br/><br/> skill: <textarea name="content" cols="30" rows="5"></textarea><br/><br/>
        <input type="submit" name="button" value="Submit">
    </form>
</body>
</html>
Copy the code

Effect:

2.3 Deleting Data

Step entry: list.php

Click the delete button on the list. PHP page to go to the del.php page and pass in the deleted ID
Connect to the database on the del.php page
Delete data by ID
When the deletion is successful, jump to list.php

List.php ();

<! DOCTYPE html> <html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="Width = device - width, initial - scale = 1.0">
    <title>Document</title>
    <style>
        table {
            width: 780px;
            border: 1px solid # 000;
            margin: auto;
        }
        th,td {
            border: 1px solid # 000;
        }
    </style>
</head>
<body>
    
    
      
        // 1. Connect to the database
        require './inc/conn.php';

        // 2. Obtain data
        $resultSets=mysqli_query($link.'select * from news'); # Return result set object
        $list=mysqli_fetch_all($resultSets, MYSQLI_ASSOC);
        // print_r($list); # Match the result to an associative array
    ? >
    <a href="./add.php"News > add < / a > < table > < tr > < th > id < / th > < th > name < / th > < th > skills < / th > < th > change < / th > < th > delete < / th >
       foreach($list as $rows) :? >
                <tr>
                    <td>
       echo $rows['id']; ? ></td>
                    <td>
       echo $rows['title']; ? ></td>
                    <td>
       echo $rows['content']; ? ></td> <! -- <td>
       echo date('Y-m-d H:i:s'.$rows['createtime']); ? ></td> -->
                    <td><input type="button" value="Change"></td>
                    <td><input type="button" value="Delete" onclick="If (confirm(' Confirm delete? ')) location.href='./del.php? id=<? php echo$rows['id'] ? > '"></td>
                </tr>
            
       endforeach;? >
        </tr>
    </table>
</body>
</html>
Copy the code

Del.php code:


      
    // 1. Connect to the database
    require './inc/conn.php';

    // 2
    $sql = "delete from news where id = {$_GET['id']}";

    // 3. Execute the SQL statement
    if (mysqli_query($link.$sql)) {
        header('location:./list.php');
    }
    else {
        echo 'Deletion failed';
    }
? >
Copy the code

Effect:

2.4 Modifying Data

Entry: list. PHP

Step: Step 1: display the modified page 1, connect to the database 2, obtain the modified data 3, display the data in the column form

Step 2: Execute modify logic 1, obtain new data 2, concatenate modified SQL statement, execute modify logic

List. The PHP code:

<! DOCTYPE html> <html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="Width = device - width, initial - scale = 1.0">
    <title>Document</title>
    <style>
        table {
            width: 780px;
            border: 1px solid # 000;
            margin: auto;
        }
        th,td {
            border: 1px solid # 000;
        }
    </style>
</head>
<body>
    
    
      
        // 1. Connect to the database
        require './inc/conn.php';

        // 2. Obtain data
        $resultSets=mysqli_query($link.'select * from news'); # Return result set object
        $list=mysqli_fetch_all($resultSets, MYSQLI_ASSOC);
        // print_r($list); # Match the result to an associative array
    ? >
    <a href="./add.php"News > add < / a > < table > < tr > < th > id < / th > < th > name < / th > < th > skills < / th > < th > change < / th > < th > delete < / th >
       foreach($list as $rows) :? >
                <tr>
                    <td>
       echo $rows['id']; ? ></td>
                    <td>
       echo $rows['title']; ? ></td>
                    <td>
       echo $rows['content']; ? ></td> <! -- <td>
       echo date('Y-m-d H:i:s'.$rows['createtime']); ? ></td> -->
                    <td><input type="button" value="Change"  onclick="location.href='./edit.php? id=<? php echo$rows['id'] ? > '"></td>
                    <td><input type="button" value="Delete" onclick="If (confirm(' Confirm delete? ')) location.href='./del.php? id=<? php echo$rows['id'] ? > '"></td>
                </tr>
            
       endforeach;? >
        </tr>
    </table>
</body>
</html>
Copy the code

Edit. PHP code:


      
    // Connect to the database
    require './inc/conn.php';
    // 1. Obtain the modified data
    $sql="select * from news where id={$_GET['id']}";
    $rs=mysqli_query($link.$sql); // Get the modified data
    $row=mysqli_fetch_assoc($rs); // Match the modified data into a one-dimensional associative array

    // 2. Execute the modification logic
    if (!empty($_POST)) {
        $id=$_GET['id'];
        $title=$_POST['name'];
        $content=$_POST['content'];
        $sql="update news set title='$title',content='$content' where id=$id";
        if (mysqli_query($link.$sql)) {
            header('location:list.php');
        }
        else {
            echo Error:.mysqli_error($link);
        }
        exit;
    }
? ><! DOCTYPE html> <html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="Width = device - width, initial - scale = 1.0">
    <title>Document</title>
</head>
<body>
    
    <form action="" method="post"<input type="text" name="name" value="<? php echo$row['title']? >"<br/><br/> skill: <textarea name="content" cols="30" rows="5">
       echo $row['content']? ></textarea><br/><br/>
        <input type="submit" name="button" value="Submit">
        <input type="button" name="button" value="Return" onclick="location.href='list.php'">
    </form>
</body>
</html>
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Effect:

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PHP connects to the MySQL database application

preface

A, modules,

1.1 Included Files

Second, data operation

2.1 Display Data

2.2 Adding Data

2.3 Deleting Data

2.4 Modifying Data

PHP connects to the MySQL database application

preface

A, modules,

1.1 Included Files

Second, data operation

2.1 Display Data

2.2 Adding Data

2.3 Deleting Data

2.4 Modifying Data

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