php基础七

<!-- 第十三章php操作数据库 -->
<?php
//     $sql = "insert into money(username,age) values('bao3', 25)";
//     $con = mysqli_connect("localhost","root","root");
//     if (!$con) {
//         die('Could not connect:'.mysql_error());
//     }
//     echo '连接成功！';
    
    
//     mysqli_select_db($con, 'mytest');
//     $result = mysqli_query($con, $sql);
//     var_dump($result);
//     mysqli_close($con)
?>

<form action="" method="post">
    用户名：<input type="text" name="username" /><br />
    密码：<input type="password" name="password" /><br />
  重复密码：<input type="password" name="repassword" /><br />
  <input type="submit" value="提交" />
</form>

<?php
    if (trim(@$_POST['password']) != trim(@$_POST['repassword'])) {
        exit('两次密码不一致，请返回上一页');
    }
    
    @$username = trim($_POST['username']);
    @$password = md5(trim($_POST['password']));
    @$time = date('ymd',time());
    $ip = $_SERVER['REMOTE_ADDR'];
    $conn = mysqli_connect('localhost', 'root', 'root');
    if (mysqli_error($conn)) {
        echo mysqli_error($conn);
        exit;
    }
    
    mysqli_select_db($conn, 'book');
    mysqli_set_charset($conn, 'utf-8');
    mysqli_set_charset($conn, 'gb2312');
    $sql = "insert into user(username,password,createtime,createip)
         values('".$username."','".$password."','".$time."','".$ip."')";
    $result = mysqli_query($conn, $sql);
    if ($result) {
        echo '成功';
    }else {
        echo '失败';
    }
    
    echo '当前用户插入的ID为'.mysqli_insert_id($conn);
    mysqli_close($conn);
?>

<!-- 做一个列表显示 -->
<?php
    $conn = mysqli_connect('localhost', 'root', 'root', 'book');
    if (mysqli_errno($conn)) {
        mysqli_error($conn);
        exit;
    }
    mysqli_set_charset($conn, 'utf8');
    mysqli_set_charset($conn, 'gb2312');
    $sql = "select id,username,createtime,createip from user order by id desc";
    $result = mysqli_query($conn, $sql);
    if ($result && mysqli_num_rows($result)) {
        echo '<table width="800" border="1">';
        while ($row = mysqli_fetch_assoc($result)){
            echo '<tr>';
            echo '<td>'.$row['username'].'</td>';
            echo '<td>'.@date('Y-m-d H:i:s', $row['createtime']).'</td>';
            echo '<td>'.long2ip($row['createip']).'</td>';
            echo '<td><a href="edit.php?id='.$row['id'].'">编辑用户</a></td>';
            echo '<td><a href="delete.php?id='.$row['id'].'">删除用户</a><td/>';
            echo '</tr>';
        }
        echo '</table>';
    }else {
        echo '没有数据';
    }
    mysqli_close($conn);
?>

<!-- 把用户做个分页 -->
<?php
// 做一个配置文件config.php
//数据库服务器
define('DB_HOST', 'localhost');
//数据库用户名
define('DB_USER', 'root');
//数据库密码
define('DB_PWD', 'secret');
//库名
define('DB_NAME', 'book');
//字符集
define('DB_CHARSET', 'utf8');
?>
<?php
// connection.php
include 'config.php';
$conn = mysqli_connect('DB_HOST', 'DB_USER', 'DB_PWD', 'DB_NAME');
if (mysqli_error($conn)) {
    mysqli_error($conn);
    exit;
}
mysqli_set_charset($conn, DB_CHARSET);
?>
<?php
    include 'connection.php';
    $count_sql = 'select count(id) as c from user';
    $result = mysqli_query($conn, $count_sql);
    $data = mysqli_fetch_assoc($result);
    $count = $data['c'];
    
    $page = isset($_GET['page']) ? (int)$_GET['page'] : 1;
    
//     if (isset($_GET['page'])) {
//         $page = (int) $_GET['page'];
//     }else {
//         $page = 1;
//     }
    
    $num = 5;
    $total = ceil($count / $num);
    if ($page <= 1) {
        $page = 1;
    }
    if ($page >= $total) {
        $page = $total;
    }
    $offset = ($page - 1) * $num;
    
    $sql = "select id,username,createtime,createip from user order by id desc
       id desc limit $offset,$num";
    $result = mysqli_query($conn, $sql);
    if ($result && mysqli_num_fields($result)) {
       echo '<table width="800" border="1">' ;
       while ($row = mysqli_fetch_assoc($result)){
           echo '<tr>';
           echo '<td>'.$row['username'].'</td>';
           echo '<td>'.date('Y-m-d H:i:s',$row['createtime']).'</td>';
           echo '<td>'.long2ip($row['createip']).'</td>';
           echo '<td><a herf="edit.php?id='.$row['id'].'">编辑用户</a></td>';
           echo '<td><a herf="delete.php?id='.$row['id'].'"></a></td>';
           echo '</tr>';
       }
       echo '<tr>
             <td colspan="5">
             <a herf="page.php?page=1">首页</a>
             <a href="page.php?page='.($page - 1).'">上一页</a>
             <a herf="page.php?page='.($page + 1).'">下一页</a>
             <a herf="page.php?page='.$total.'">页尾</a>
                        当前是第'.$page.'页 共'.$total.'页
             </td>
             </tr>';
       echo '</table>';
    }else {
        echo '没有数据';
    }
    mysqli_close($conn);
?>
<!-- 批量和指定删除用户 -->
<?php
    include 'connection.php';
    if (is_array($_POST['id'])) {
        $id = join(',', $_POST['id']);
    }elseif (is_numeric($_GET['id'])){
        $id = (int) $_GET['id'];
    }else {
        echo '数据不合法';
        exit;
    }
    $sql = "delete from user where id in($id)";
    $result = mysqli_query($conn, $sql);
    if ($result) {
        echo '删除成功';
    }else {
        echo '删除失败';
    }
?>
<!-- 修改用户信息 -->
<?php
//edit.php
    include 'connection.php';
    if (is_numeric($_GET['id'])) {
        $id = (int) $_GET['id'];
    }
    $sql = "select id,username from user where id=".$id;
    $result = mysqli_query($conn, $sql);
    $data = mysqli_fetch_assoc($result);
?>
<?php
    //update.php
    include 'connection.php';
    $id = (int) $_POST['id'];
    if (trim($_POST['password'])) {
        $password = md5(trim($_POST['password']));
        $sql = "update user set password='".$password."' where id = $id";
    }else {
        echo '修改成功';
    }
    $result = mysqli_query($conn, $sql);
    if ($result) {
        echo '修改成功';
    }
?>
<form action="update.php" method="post">
    用户名：<input type="text" name="username" value="<?php echo $data['username'];?>" readonly/><br /> 
    密码：<input type="password" name="password" /><br />
  <input type="hidden" value="<?php echo $data['id'];?>" name="id" />
  <input type="submit" value="提交" />    
</form>


<!-- 数据显示乱码终极解决办法 -->
<?php
//     解决乱码问题的核心思想 ，就是：一定要多个不同的文件系统中一定要统一编码。
//     9个要点分别是：
//     1.html编码与MySQL编码一致
//     2.PHP编码与MySQL编码一致
//     3.若有header头发送字符集，请与数据库一样
//     4.<meta http-equiv="Content-Type"content="text/html;charset=utf-8">
//       要和页面文字编码一致
//     5.数据库建库的字符集要统一
//     6.表的字符集要统一
//     7.列的字符集要统一(表设了列就默认写表的)
//     8.连接,校验的字符集要统一
//     9.结果集的字符集要统一



?>