PHP连接MySQL进行增、删、改、查操作

<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>
</tr>
<?php
1.造一个mysqli对象,造连接对象
$db = new mysqli("localhost","用户名","密码","数据库名");
2.准备一条sql语句
$sql = "select * from info";
3.执行sql语句,如果是查询语句，成功返回结果集对象
$reslut = $db->query($sql);
4.判断返回是否执行成功
if($reslut)
{
while($attr = $reslut->fetch_row())
{
echo "<tr>
<td>{$attr[0]}</td>
<td>{$attr[1]}</td>
<td>{$attr[2]}</td>
<td>{$attr[3]}</td>
<td>{$attr[4]}</td>
</tr>";
}
}
?>
</table>

<?php
//造连接对象
$db = new mysqli("localhost","用户名","密码","数据库名");
//准备sql语句
$sql = "delete from info where code='p004'";    删
//$sql = "insert course values"       增
//$sql = "update 表名 set 字段=信息 where 字段=信息"   改
//执行sql语句
$r = $db->query($sql);
if($r)
{
echo "执行成功";
}
else
{
echo "执行失败";
}
?>