php基础七之php操作数据库
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2022-03-07 10:33:42
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<!-- 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
?>
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