怎么样使用PHP连接数据库实现注册页面的增删改查操作？
本文实例为大家分享了PHP连接数据库实现注册页面的增删改查操作的方法，供大家参考，具体内容如下
1.连接数据库
<?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');
?>
2.注册页面（html页面）
<!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>
3.将注册数据显示在数据库
//往数据库中添加数据
<?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");
?>
4.返回后台界面
<?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',$value['time'])."</td>";
echo "<td width='100px'><a href='update1.php?id=$value[id]'>修改</a><a href='delete.php?id=$value[id]'>删除</a></td>";
echo "<tr/>";
echo "</table>";
}
?>
5.修改数据
//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>
<?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;
}
?>
<h3>注册页面</h3>
<form action="update.php" method='post'>
<input type="hidden" name="id" id="" value="<?php echo $row['id']?>"/>
<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="<?php echo $row['username']?>"/>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="<?php echo $row['password']?>"/>密码不能为空</td>
</tr>
<tr>
<td align='right'>邮箱</td>
<td><input type="text" name="email" id="" value="<?php echo $row['email']?>"/></td>
</tr>
<tr>
<td align='right'>性别</td>
<td>
<input type="radio" name="sex" id="" value='1' <?php if($row['sex']=='1'){ echo 'checked';}?>/>男
<input type="radio" name="sex" id="" value='2' <?php if($row['sex']=='2'){ echo 'checked';}?>/>女
<input type="radio" name="sex" id="" value='3' <?php if($row['sex']=='3'){ echo 'checked';}?>/>保密
</td>
</tr>
<tr>
<td align='right'>个人简介</td>
<td>
<textarea name="txt" id="" cols="50" rows="10"><?php echo $row['txt']?></textarea>
</td>
</tr>
<tr>
<td colspan='2'><input type="submit" name='act' value='修改' /></td>
</tr>
</table>
</form>
</div>
</body>
</html>
//将修改的信息存入数据库
<?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?id=".$data['id']);
//echo "alert('修改失败')";
}
?>
6.删除数据
//删除数据库里的数据
<?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')";
}
?>
//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
以上就是本文的全部内容，希望对大家的学习有所帮助。
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