$db = new MySQLi("localhost","root","123","mydb");
$sql = "insert into kemu values('','基础知识')";
$db->query($sql);
echo $db->insert_id; //取上一次添加数据的主键值 主键为自增加的情况
include("DBDA.class.php");//引用类
$db=new DBDA();
建立数据库操作封装类
class DBDA
{
public $host="localhost"; //服务器地址
public $uid="root"; //用户名
public $pwd="123"; //密码
public $dbconnect; //连接对象
//操作数据库的方法
//$sql代表需要执行的SQL语句
//$type代表SQL语句的类型，1代表查询，2代表增删改
//$dbname代表要操作的数据库名称
//如果是查询，返回二维数组
//如果是增删改，返回true或false
function Query($sql,$type=1,$dbname="mydb")
{
//造连接对象
$this->dbconnect = new MySQLi($this->host,$this->uid,$this->pwd,$dbname);
//判断是否出错
if(!mysqli_connect_error())
{
//如果连接成功,执行SQL语句
$result = $this->dbconnect->query($sql);
//根据语句类型判断
if($type==1)
{
//如果是查询语句,返回二维数组
return $result->fetch_all();
}
else
{
//如果是其他语句，返回true或false
return $result;
}
}
else
{
return "连接失败！";
}
}
}
<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<h1>主页面</h1>
<form action="piliangshanchu.php" method="post">
<table width="100%" border="1" cellpadding="0" cellspacing="0">
<tr>
<td>代号</td>
<td>姓名</td>
<td>性别</td>
<td>民族</td>
<td>生日</td>
<td>操作</td>
</tr>
<?php
//造对象
$db = new MySQLi("localhost","root","123","mydb");
//判断是否出错
!mysqli_connect_error() or die("连接失败！");
//写SQL语句
$sql = "select * from Info";
//执行SQL语句
$result = $db->query($sql);
//读取数据
$attr = $result->fetch_all();
//遍历数组，显示
foreach($attr as $v)
{
$sex = $v[2]?"男":"女";
$sql = "select Name from Nation where Code = '{$v[3]}'";
$r = $db->query($sql);
$a = $r->fetch_row();
echo "
<tr>
<td>
<input class='ck' name='ck[]' type='checkbox' value='{$v[0]}' />
{$v[0]}</td>
<td>{$v[1]}</td>
<td>{$sex}</td>
<td>{$a[0]}</td>
<td>{$v[4]}</td>
<td><a href='delete.php?code={$v[0]}'>删除</a><a href='update.php?code={$v[0]}'>修改</a></td>
</tr>
";
}
?>
<tr>
<td><input type="checkbox" onclick="CheckAll(this)" />全选</td>
<td><input type="submit" value="批量删除" /></td>
</tr>
</table>
<a href="add.php">添加数据</a>
</form>
</body>
<script type="text/javascript">
function CheckAll(a)
{
var ck = document.getElementsByClassName("ck");
//a.checked;
//document.getElementById().removeAttribute
for(var i=0;i<ck.length;i++)
{
if(a.checked)
{
ck[i].setAttribute("checked","checked");
}
else
{
ck[i].removeAttribute("checked");
}
}
}
</script>
</html>
<?php
class DBDA
{
public $host="localhost"; //服务器地址
public $uid="root"; //用户名
public $pwd="123"; //密码
public $dbconnect; //连接对象
//操作数据库的方法
//$sql代表需要执行的SQL语句
//$type代表SQL语句的类型，1代表查询，2代表增删改
//$dbname代表要操作的数据库名称
//如果是查询，返回二维数组
//如果是增删改，返回true或false
function Query($sql,$type=1,$dbname="mydb")
{
//造连接对象
$this->dbconnect = new MySQLi($this->host,$this->uid,$this->pwd,$dbname);
//判断是否出错
if(!mysqli_connect_error())
{
//如果连接成功,执行SQL语句
$result = $this->dbconnect->query($sql);
//根据语句类型判断
if($type==1)
{
//如果是查询语句,返回二维数组
return $result->fetch_all();
}
else
{
//如果是其他语句，返回true或false
return $result;
}
}
else
{
return "连接失败！";
}
}
}
<?php
$ck = $_POST["ck"];
include("DBDA.class.php");
$db = new DBDA();
foreach($ck as $v)
{
$sql = "delete from Info where Code='{$v}'";
$db->Query($sql,0);
}
header("location:main.php");