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在PHP设计数据库中如何增删改查源代码(下)

3.更新

<html>
<body>
 <title>
   更新
 </title>

<?
//PHP程序的开始
$db = MySQL_connect("localhost", "root");
MySQL_select_db("mysite",$db);
if (!$id)
 {
  $result = MySQL_query("SELECT * FROM user",$db);
  if ($myrow = MySQL_fetch_array($result))
  {
   printf("<h2 align=left>请选择要修改的用户名字:</h2>");
   do {
    printf("%s<a href="%s?id=%s">%s </a><br>n",
    $myrow["id"],$PATH_INFO,$myrow["id"], $myrow["name"]);
     }
   while ($myrow = MySQL_fetch_array($result));
  }
  else
  {
   echo "对不起!数据库中没有记录";
  }
 }
else
{
 if ($submit)
  {
  $sql = "UPDATE user SET name='$name',city='$city',
  address='$address',email='$email' WHERE id=$id";
  $result = MySQL_query($sql);
  echo "谢谢!数据更改完成n";
  }
 else
  {
  $sql = "SELECT * FROM user WHERE id=$id";
  $result = MySQL_query($sql);
  $myrow = MySQL_fetch_array($result);
//以下不是PHP的部分
?>
  <h2 align=left>请对用户的信息进行修改:</h2>
  <form method="post" action="<? echo $PATH_INFO ?>">
  <input type=hidden name="id"
  value="<?php echo $myrow["id"] ?>">
  姓名:<input type="Text" name="first" value="<?php
  echo $myrow["name"] ?>"><br>
  城市:<input type="Text" name="city" value="<?php echo
  $myrow["city"] ?>"><br>
  住址:<input type="Text" name="address" value="<?php echo
  $myrow["address"] ?>"><br>
   电子邮件:<input type="Text" name="email" value="<?php echo
  $myrow["email"] ?>"><br>
   <input type="Submit" name="submit" value="修改完毕">
  </form>
<?
//PHP 的结束
65:}
}
?>
</body>
</html>

4.增加删除记录

<html>
<body>
<title>
  增加删除记录
</title>
<?
$db = MySQL_connect("localhost", "root");
MySQL_select_db("mysite",$db);
if ($submit)
  {
  $sql = "INSERT INTO myuser (name,city,address,email)
  VALUES ('$name','$city','$address','$email')";
  $result = MySQL_query($sql);
   echo "记录添加成功!<p>";
  }
else
  if ($delete)
   {
   // 删除一条记录
   $sql = "DELETE FROM myuser WHERE id=$id";
   $result = MySQL_query($sql);
   echo "记录删除成功!<p>";
   }
  else
   {
  printf("<h2 align=left>删除一个用户的所有信息:</h2>");
  $result = MySQL_query("SELECT * FROM myuser",$db);
  while ($myrow = MySQL_fetch_array($result))
    {
     printf("%s:<a href="%s?id=%s&delete=yes">%s</a> <br>n",
     $myrow["id"],$PATH_INFO, $myrow["id"], $myrow["name"]);
    }
 ?>
 <P>
 <h2 align=left>
   添加一个新的用户:
 </h2>
 <form method="post" action="<?php echo $PATH_INFO?>">
姓名:<input type="Text" name="name" value="<?php
  echo $myrow["name"] ?>"><br>
  城市:<input type="Text" name="city" value="<?php echo
  $myrow["city"] ?>"><br>
  住址:<input type="Text" name="address" value="<?php echo
  $myrow["address"] ?>"><br>
   电子邮件:<input type="Text" name="email" value="<?php echo
  $myrow["email"] ?>"><br>
  <input type="Submit" name="submit" value="添加用户">
  </form>
<?php
}
?>
</body>
</html>

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