PHP connects to the database to implement addition, deletion, modification and query operations on the registration page, php addition and deletion

PHP connects to the database to implement add, delete, modify and check operations on the registration page, php add and delete

This article shares an example of how to connect PHP to the database to implement add, delete, modify and check operations on the registration page. For your reference, the specific content is as follows

1. Connect to database

<&#63;php
 //本地测试
 $host = '127.0.0.1';
 $port = 3306;
 $user = "root";
 $pwd = "";
 $link = @mysql_connect("{$host}:{$port}",$user,$pwd,true);
 if(!$link) {
  die("Connect Server Failed: " . mysql_error());
 }
 //选择连接的数据库库名
 mysql_select_db("my");
 //设置字符编码utf8
 mysql_set_charset('utf8');
&#63;>

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2. Registration page (html page)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
 <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 <title>Document</title>
</head>
<body>
<h3>注册页面</h3>
 <form action="add.php" method='post'>
  <table border='1' cellpadding='0' cellspacing='0' width='80%' bgcolor='#ABCDEF'>
   <tr>
    <td align='right'>用户名</td>
    <td><input type="text" name="username" id=""/>以小写字母开始，长度要求5~10</td>
   </tr>
   <tr>
    <td align='right'>密码</td>
    <td><input type="password" name="password" id=""/>密码不能为空</td>
   </tr>
   <tr>
    <td align='right'>邮箱</td>
    <td><input type="text" name="email" id="" /></td>
   </tr>
   <tr>
    <td align='right'>性别</td>
    <td>
     <input type="radio" name="sex" id="" value='1' />男
     <input type="radio" name="sex" id="" value='2' />女
     <input type="radio" name="sex" id="" value='3' />保密
    </td>
   </tr>
   <tr>
    <td align='right'>个人简介</td>
    <td>
     <textarea name="txt" id="" cols="50" rows="10"></textarea>
    </td>
   </tr>
   <tr>
    <td colspan='2'><input type="submit" name='act' value='注册' /></td>
   </tr>
  </table>
 </form>

</body>
</html>

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3. Display registration data in the database

//往数据库中添加数据

<&#63;php
header("Content-type:text/html; charset=utf-8");
//-----------------------连接数据库---------------------------
include_once "connect.php";
//-------------------------将数据连接到数据库------------------
$time=time();
$sql="insert into user (username,password,email,sex,txt,`time`) value('{$_POST['username']}','{$_POST['password']}','{$_POST['email']}','{$_POST['sex']}','{$_POST['txt']}','{$time}')";
$res=mysql_query($sql);
header("location:hello.php");
&#63;>

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4. Return to the background interface

<&#63;php
header("Content-type:text/html; charset=utf-8");
//-----------------------连接数据库------------------------------
include_once "connect.php";
//--------------------查询数据库--------------------------------
$query="select * from user";
$result=mysql_query($query);
if(!$result)
{
 die("could not to the database<br/>".mysql_error());
}
//-------------------封装函数-----------------------------
//该函数将数据库的数据写成数组形式
function result2Arr($result){
 while($result_row=mysql_fetch_assoc($result)){
  $arr[] = $result_row;
 }
 return $arr;
}
$arr = result2Arr($result);
foreach($arr as $key=>$value){
 echo "<table border='1px'>";
 echo "<table border='1px' >";
 echo "<tr> ";
 echo "<td width='100px'>".$value['id']."</td>";
 echo "<td width='100px'>".$value['username']."</td>";
 echo "<td width='100px'>".$value['password']."</td>";
 echo "<td width='200px'>".$value['email']."</td>";
 echo "<td width='100px'>".$value['sex']."</td>";
 echo "<td width='100px'>".$value['txt']."</td>";
 echo "<td width='100px'>".date('Y-m-d H:i:s',$value['time'])."</td>";
 echo "<td width='100px'><a href='update1.php&#63;id=$value[id]'>修改</a>    <a href='delete.php&#63;id=$value[id]'>删除</a></td>";
 echo "<tr/>";
 echo "</table>";
}
&#63;>

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5. Modify data

//当用户要修改信息时，返回页面，页面中包含之前填写的信息

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
 <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 <title>Document</title>
</head>
<body>
<div>

<&#63;php
 include_once "connect.php";
 $sql="select * from user where id='".$_GET['id']."'";
 //echo "sql:".$sql;(显示出修改哪一行)
 $result=mysql_query($sql,$link);
 $arr = result2Arr($result);
 //print_r($arr);
 $row = $arr[0];

function result2Arr($result){
 while($result_row=mysql_fetch_assoc($result)){
  $arr[] = $result_row;
 }
 return $arr;
}
&#63;>
  <h3>注册页面</h3>
  <form action="update.php" method='post'>
   <input type="hidden" name="id" id="" value="<&#63;php echo $row['id']&#63;>"/>
   <table border='1' cellpadding='0' cellspacing='0' width='80%' bgcolor='#ABCDEF'>
    <tr>
     <td align='right'>用户名</td>
     <td><input type="text" name="username" id="" value="<&#63;php echo $row['username']&#63;>"/>以小写字母开始，长度要求5~10</td>
    </tr>
    <tr>
     <td align='right'>密码</td>
     <td><input type="password" name="password" id=""value="<&#63;php echo $row['password']&#63;>"/>密码不能为空</td>
    </tr>
    <tr>
     <td align='right'>邮箱</td>
     <td><input type="text" name="email" id="" value="<&#63;php echo $row['email']&#63;>"/></td>
    </tr>
    <tr>
     <td align='right'>性别</td>
     <td>
      <input type="radio" name="sex" id="" value='1' <&#63;php if($row['sex']=='1'){ echo 'checked';}&#63;>/>男
      <input type="radio" name="sex" id="" value='2' <&#63;php if($row['sex']=='2'){ echo 'checked';}&#63;>/>女
      <input type="radio" name="sex" id="" value='3' <&#63;php if($row['sex']=='3'){ echo 'checked';}&#63;>/>保密
     </td>
    </tr>
    <tr>
     <td align='right'>个人简介</td>
     <td>
      <textarea name="txt" id="" cols="50" rows="10"><&#63;php echo $row['txt']&#63;></textarea>
     </td>
    </tr>
    <tr>
     <td colspan='2'><input type="submit" name='act' value='修改' /></td>
    </tr>
   </table>
  </form>
</div>
</body>
</html>

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//将修改的信息存入数据库

<&#63;php
header("Content-type:text/html; charset=utf-8");
//通过post获取页面提交数据信息
$data = $_POST;
//print_r($data);
include_once "connect.php";
$sql = "update `user` set username='{$data['username']}',password='{$data['password']}', email='{$data['email']}',sex='{$data['sex']}',txt='{$data['txt']}' where id='{$data['id']}'";
echo $sql;
$res = mysql_query($sql,$link);
if($res){
 header("Location:hello.php");
 //echo "alert('修改成功')";
}else{
 header("Location:update1.php&#63;id=".$data['id']);
 //echo "alert('修改失败')";
}
&#63;>

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6. Delete data

//删除数据库里的数据

<&#63;php
header("Content-type:text/html; charset=utf-8");
include_once 'connect.php';
$sql = "delete from user where id='".$_GET['id']."'";
$sus=mysql_query($sql,$link);
if($sus){
 header("location:hello.php");
}else{
 echo "alert('删除失败')";
}
&#63;>
//若要删除李四，点击删除后，会自动跳转到后台页面，数据库里数据也删除

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The above is the entire content of this article, I hope it will be helpful to everyone’s study.

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