<meta charset="UTF-8"> <?php class F{ public $locahost; public $name; public $pwd; public $database; public function __construct($locahost,$name,$pwd,$database) { $this->locahost = $locahost; $this->name = $name; $this->pwd = $pwd; $this->database = $database; } public function MysqliConnect(){ $link = mysqli_connect($this->locahost,$this->name,$this->pwd,$this->database); mysqli_query($link,‘set names utf8‘); return $link; } public function Insert($data){ foreach ($data as $k => $v) { @$value = $value."‘$v‘,"; @$key = $key."$k,"; } $lastValue = substr($value,0,-1); $lastKey = substr($key,0,-1); $link = $this->MysqliConnect(); $sql = "insert into depart ($lastKey) VALUES ($lastValue)"; if(mysqli_query($link,$sql)){ $res = 1; }else{ $res = 0; } return $res; } //定义一个查询的方法(id的值,id的字段名,表名) public function SelectData($table,$id=null,$id_name=null){ //判断一下id有没有值 if($id!==null){ //查询的是单条的数据 $link = $this->MysqliConnect(); //拼接sql $sql = "SELECT * FROM $table WHERE $id_name=‘$id‘"; //执行 $res = mysqli_query($link,$sql); //生成数组 while ($a = mysqli_fetch_assoc($res)){ $data[] = $a; } }else{ //查询的全部的数据 //连接数据库,获取$link $link = $this->MysqliConnect(); //拼接sql $sql = "SELECT * FROM $table"; //执行 $res = mysqli_query($link,$sql); //生成数组 while ($a = mysqli_fetch_assoc($res)){ $data[] = $a; } } return $data; } //封装一个删除的方法 public function DeleteData($table,$id,$id_name){ //链接数据库 $link = $this->MysqliConnect(); //拼接sql $sql = "delete from $table WHERE $id_name=$id"; //执行 if(mysqli_query($link,$sql)){ $res = 1; }else{ $res = 2; } return $res; } //封装一个修改的方法 public function UpdateData($table_name,$data){ //拿一下link $link = $this->MysqliConnect(); //循环取出来我们想要的值然后拼接 foreach ($data as $k=>$v){ //$k就是所有的键(数据库里面的字段) // $v就是所有的值(数据库里面的字段值) //var_dump(strpos($k,‘id‘)); if(strpos($k,‘id‘) !== false){ $last_id_name = $k; //获取到了id的字段名 $last_id_value = $v; //获取的是id的字段值 }else{ //拼接 @ $str .= "$k=‘$v‘,"; } } //截取一下最后的拼接 $last_str = substr($str,0,-1); //拼接where条件 $where = "$last_id_name=$last_id_value"; //拼接剩下的sql $sql = "update $table_name set $last_str WHERE $where"; if(mysqli_query($link,$sql)){ return 1; }else{ return 2; } } //定义一个分页的方法 public function GetPage($table,$length){ //求出总条数 $link = $this->MysqliConnect(); $sql = "select * from $table"; $res = mysqli_query($link,$sql); $count = mysqli_num_rows($res); //设置每页的条数 //$length = 3; //总页数 $last_count = ceil($count/$length); //接收当前页 $current_page = empty($_GET[‘page‘])?1:$_GET[‘page‘]; //偏移量 $limit = ($current_page-1)*$length; //拼接sql $sql = "select * from $table limit $limit,$length"; //执行sql $res1 = mysqli_query($link,$sql); //转化成数组 while ($arr = mysqli_fetch_assoc($res1)){ $data[] = $arr; } //判断首页、尾页、上一页、下一页 $home_page = 1; //首页 $last_page = $last_count;//尾页 //上一页 if($current_page<=1){ $pre_page = 1; }else{ $pre_page = $current_page-1; } //下一页 if($current_page>=$last_count){ $next_page = $last_count; }else{ $next_page = $current_page+1; } //返回 $data2[‘data‘] = $data; //表单数据 $data2[‘current_page‘] = $current_page; //当前页 $data2[‘home_page‘] = $home_page; //首页 $data2[‘last_page‘] = $last_page; //尾页 $data2[‘pre_page‘] = $pre_page; //上一页 $data2[‘next_page‘] = $next_page; //下一页 return $data2; } } //$obj = new F(‘127.0.0.1‘,‘root‘,‘root‘,‘demo‘); //$res = $obj->GetPage(‘book‘,3); //print_r($res);
分页的调用:
<?php //引入类文件 include "3.php"; //实例化 $obj = new F(‘127.0.0.1‘,‘root‘,‘root‘,‘demo‘); $data = $obj->GetPage(‘book‘,5); ?> <table> <tr> <th>ID</th> <th>名字</th> <th>价格</th> <th>作者</th> <th>照片</th> </tr> <?php foreach ($data[‘data‘] as $k =>$v){?> <tr> <td><?php echo $v[‘book_id‘];?></td> <td><?php echo $v[‘book_name‘];?></td> <td><?php echo $v[‘book_price‘];?></td> <td><?php echo $v[‘book_author‘];?></td> <td><img src="<?php echo $v[‘book_photo‘];?>" width="100px;" height="100px;"></td> </tr> <?php }?> <a href="fenye.php?page=<?php echo $data[‘home_page‘]?>">首页</a> <a href="fenye.php?page=<?php echo $data[‘pre_page‘]?>">上一页</a> <a href="fenye.php?page=<?php echo $data[‘next_page‘]?>">下一页</a> <a href="fenye.php?page=<?php echo $data[‘last_page‘]?>">尾页</a> </table>
原文地址:https://www.cnblogs.com/hopelooking/p/9037873.html
时间: 2024-10-12 03:54:00