Example of adding, deleting, modifying and checking user data by connecting to the database in PHP

The following editor will bring you an overall operation example of using PHP to connect to the database to implement addition, deletion, modification and query of user data. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look.

main page(main page)

<table width="100%" border="1" cellpadding="0" cellspacing="0">
<tr>
<td>代号</td>
<td>姓名</td>
<td>性别</td>
<td>民族</td>
<td>生日</td>
<td>操作</td>
</tr>

<?php
$db = new MySQLi("localhost","root","","mydb");
if(mysqli_connect_error()){

　　die("连接失败");

} 
$sql = "select * from Info";
$result = $db->query($sql);
$attr = $result->fetch_all();
foreach($attr as $v)
{
 $sex = $v[2]? &#39;男&#39;:&#39;女&#39;;　　//三元运算符判断性别
 $sql = "select Name from Nation where Code =&#39;$v[3]&#39;";
 $result = $db ->query($sql);
 $attr = $result->fetch_assoc();
 echo "<tr>
 <td>{$v[0]}</td>
 <td>{$v[1]}</td>
 <td>{$sex}</td>
 <td>{$attr[&#39;Name&#39;]}</td>
 <td>{$v[4]}</td>
 <td>
  <a href=&#39;Delete.php?code={$v[0]}&#39;>删除</a>
  <a href=&#39;Update.php?code={$v[0]}&#39;>修改</a>
 </td>
 </tr>";
}
?>

</table>
<p>

<a href="Add.php" rel="external nofollow" >添加数据</a>

</p>

Add(Add data page)

##

<h1>添加数据</h1>
<form action="AddChuLi.php" method="post">
 <p>代号：<input type="text" name="code" /></p>
 <p>姓名：<input type="text" name="name" /></p>
 <p>性别：
   <input type="radio" value="男" name="sex" />男
   <input type="radio" value="女" name="sex" />女
 </p>
 <p>民族:
   <select name="nation">
   <?php
   $db = new MySQLi("localhost","root","","mydb");
  if(mysqli_connect_error()){

　　die("连接失败");

　　}
   $sql = "select * from Nation";
   $r = $db->query($sql);
   $att = $r->fetch_all();
   foreach($att as $v)
   {
    echo "<option value=&#39;{$v[0]}&#39;>{$v[1]}</option>";
   }
   ?>
   </select>
 </p>
 <p>生日：<input type="text" name="birthday" /></p>
 <p><input type="submit" value="添加数据" /></p>
</form>

AddChuLi page(Add data processing page)

<?php
$code = $_POST["code"];
$name = $_POST["name"];
$sex = $_POST["sex"];
$s = 1;
if($sex =="女")
{
 $s=0;
}
$nation = $_POST["nation"];
$birthday = $_POST["birthday"];
$db = new MySQLi("localhost","root","","mydb");
if(mysqli_connect_error()){

　　die("连接失败");

} 

$sql = "insert into Info values(&#39;{$code}&#39;,&#39;{$name}&#39;,&#39;{$s}&#39;,&#39;{$nation}&#39;,&#39;{$birthday}&#39;)";　　//添加数据语句
$result = $db->query($sql);
if($result)
{
 header("location:main.php");　　//php跳转页面方式
}
else
{
 echo "添加失败！";
}

DeleteChuLi page (Delete data processing page)

<?php
$code = $_GET["code"];
$db = new MySQLi("localhost","root","","mydb");
if(mysqli_connect_error()){

　　die("连接失败");

} 

$sql = "delete from Info where Code =&#39;{$code}&#39;";　　//删除语句
$r = $db->query($sql);
if($r)
{
 header("location:main.php");
}
else
{
 echo "删除失败！";
}

Update page (modify data page)

<h1>修改数据</h1>
<?php
$code = $_GET["code"];
$db = new MySQLi("localhost","root","","mydb");
if(mysqli_connect_error()){

　　die("连接失败");

} 

$sql1 = "select * from Info where Code=&#39;{$code}&#39;";
$r1 = $db->query($sql1);
$att1 = $r1->fetch_row();
?>


<form action="UpdateChuLi.php" method="post">
 <p>代号：<input type="hidden" name="code" value="<?php echo $att1[0] ?>" /></p>
 <p>姓名：<input type="text" name="name" value="<?php echo $att1[1] ?>" /></p>
 <p>性别：
   <input type="radio" value="男" name="sex" <?php echo $att1[2] ? "checked=&#39;checked&#39;" : ""; ?> />男
   <input type="radio" value="女" name="sex" <?php echo $att1[2] ? "" : "checked=&#39;checked&#39;"; ?> />女
 </p>
 <p>民族:
   <select name="nation">
   <?php
   $db = new MySQLi("localhost","root","","mydb");
   if(mysqli_connect_error()){

　　die("连接失败");

　　}
   $sql = "select * from Nation";　　//查询nation一组数据
   $r = $db->query($sql);
   $att = $r->fetch_all();
   foreach($att as $v)
   {
    if($att1[3]==$v[0])
    {
     echo "<option value=&#39;{$v[0]}&#39; selected=&#39;selectec&#39; >{$v[1]}</option>";　　
    }
    else
    {
     echo "<option value=&#39;{$v[0]}&#39;>{$v[1]}</option>";
    }
    
   }
   ?>
   </select>
 </p>
 <p>生日：<input type="text" name="birthday" value="<?php echo $att1[4] ?>"/></p>
 <p><input type="submit" value="修改数据" /></p>
</form>

ateChuLi page (modify data Processing page)

<?php
$code = $_POST["code"];
$name = $_POST["name"];
$sex = $_POST["sex"];
$s=1;
if($sex=="女")
{
 $s=0;
}
$nation = $_POST["nation"];
$birthday = $_POST["birthday"];
$db = new MySQLi("localhost","root","","mydb");
if(mysqli_connect_error()){

　　die("连接失败");

} 

$sql = "update Info set Name=&#39;{$name}&#39;,Sex={$s},Nation=&#39;{$nation}&#39;,Birthday=&#39;{$birthday}&#39; where Code=&#39;{$code}&#39;";　　//修改数据语句
$r = $db->query($sql);
if($r)
{
 header("location:main.php");
}
else
{
 echo "修改失败！";
}

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