PHP 数据增删改

<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
//1.造连接对象
$db = new MySQLi("localhost","root","123","mydb");
//2.判断是否出错
!mysqli_connect_error() or die("连接失败！");
//3.执行SQL语句
$result = $db->query("select * from Info");
//4.读取数据
$attr = $result->fetch_all();

foreach($attr as $v)
{
$sex = $v[2]?'男':'女';
//处理民族名称
$sqln = "select Name from Nation where Code='{$v[3]}'";
$rnation = $db->query($sqln);
$attrn = $rnation->fetch_assoc();

echo "<tr>
<td>{$v[0]}</td>
<td>{$v[1]}</td>
<td>{$sex}</td>
<td>{$attrn['Name']}</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>";
}

?>

</table>

<div><a href="Add.php">添加数据</a></div>

<form action="AddChuLi.php" method="post">
<div>代号：<input type="text" name="code" /></div>
<div>姓名：<input type="text" name="name" /></div>
<div>性别：
<input type="radio" value="男" name="sex" />男
<input type="radio" value="女" name="sex" />女
</div>
<div>民族：
<select name="nation">
<?php

$db = new MySQLi("localhost","root","123","mydb");
$sql = "select * from Nation";
$r = $db->query($sql);
$attr = $r->fetch_all();
foreach($attr as $v)
{
echo "<option value='{$v[0]}'>{$v[1]}</option>";
}

?>
</select>
</div>
<div>生日：<input type="text" name="birthday" /></div>
<div><input type="submit" value="添加数据" /></div>
</form>
<div><a href="main.php">主页面</a></div>

<?php

$code = $_POST["code"];
$name = $_POST["name"];
$sex = $_POST["sex"];
$s = 1;
if($sex == "女")
{
$s = 0;
}

$nation = $_POST["nation"];
$birthday = $_POST["birthday"];

$db = new MySQLi("localhost","root","123","mydb");
$sql = "insert into Info values('{$code}','{$name}',{$s},'{$nation}','{$birthday}')";

$result = $db->query($sql);

if($result)
{
header("location:Add.php");//跳转到Add.php
}
else
{
echo "添加失败！";
}

<?php

$code = $_GET["code"];

$db = new MySQLi("localhost","root","123","mydb");
$sql = "delete from Info where Code = '{$code}'";
$r = $db->query($sql);
if($r)
{
header("location:main.php");
}
else
{
echo "删除失败！";
}

<?php
$code = $_GET["code"];
$db = new MySQLi("localhost","root","123","mydb");
$sinfo = "select * from Info where Code='{$code}'";
$r = $db->query($sinfo);
$arr = $r->fetch_row(); //这个人的所有信息
?>

<form action="UpdateChuLi.php" method="post">

<div><input type="hidden" name="code" value="<?php echo $arr[0] ?>" /></div>
<div>姓名：<input type="text" name="name" value="<?php echo $arr[1] ?>" /></div>
<div>性别：
<input type="radio" value="男" name="sex" <?php echo $arr[2]?"checked='checked'":"" ?> />男
<input type="radio" value="女" name="sex" <?php echo $arr[2]?"":"checked='checked'" ?> />女
</div>
<div>民族：
<select name="nation">
<?php

$sql = "select * from Nation";
$r = $db->query($sql);
$attr = $r->fetch_all();
foreach($attr as $v)
{
if($v[0] == $arr[3])
{
echo "<option selected='selected' value='{$v[0]}'>{$v[1]}</option>";
}
else
{
echo "<option value='{$v[0]}'>{$v[1]}</option>";
}
}

?>
</select>
</div>
<div>生日：<input type="text" name="birthday" value="<?php echo $arr[4] ?>" /></div>
<div><input type="submit" value="修改数据" /></div>
</form>
<div><a href="main.php">主页面</a></div>

<?php

$code = $_POST["code"];
$name = $_POST["name"];
$sex = $_POST["sex"];
$s = 1;
if($sex == "女")
{
$s = 0;
}

$nation = $_POST["nation"];
$birthday = $_POST["birthday"];

$db = new MySQLi("localhost","root","123","mydb");
$sql="Update Info set Name='{$name}',Sex={$s},Nation='{$nation}',Birthday='{$birthday}' where Code='{$code}' ";

$r = $db->query($sql);

if($r)
{
header("location:main.php");
}
else
{
echo "修改失败！";
}