php后台编辑关联数据

数据库中两张表：

info表中“民族”关联了nation表中的“code”。

php通过后台编辑info表中民族显示成用户可看懂及可直接修改的选项。

新建xinxi.php文件显示info中数据，并且民族选项显示非代号。

<?php
$de = new mysqli("localhost","root","","12345");
$e="select * from info";
$result = $de->query($e);
$atter = $result->fetch_all();
echo "<table border=1 >";
echo "<tr>
		<td>代号</td>
		<td>姓名</td>
		<td>性别</td>
		<td>民族</td>
		<td>出生日期</td>
		<td>操作</td>		  
	   </tr> ";
foreach($atter as $v)
{
	$sex = $v[2];               //性别用 男和女显示。
	$sex = $sex?"男":"女";
	
	$nation = $v[3];             //民族用非代号显示。
	$sqln = "select name from nation where code='{$nation}'";
	$r = $de->query($sqln);
	$atr = $r->fetch_row();
	echo " <tr>
		   	<td>{$v[0]}</td><td>{$v[1]}</td><td>{$sex}</td><td>{$atr[0]}</td><td>{$v[4]}</td>
		   	<td> <a href='xiugai.php?code={$v[0]}'>修改</a> </td>
		   </tr> ";
}
echo " </table>";
echo "<a href='tianjia.php'>添加数据</a>"
?>

　　

显示结果：

添加数据：

同路径下新建tianjia.php

<h1>添加数据</h1>
	  <form action="tianjiachuli.php" method="post">
		<input type="hidden" name="code"  />  <br />
		姓名：<input type="text" name="name" /><br />
		性别：<input type="radio" name="sex" value="1" />男    <input type="radio" name="sex" value="0" />女 <br />
		
		民族：     //使用下拉获取民族选项的代号
		 <select  name="nation">
		 	<?php   
				$db = new MySQLi("localhost","root","","12345");
				$sql = "select * from nation";
				$result = $db->query($sql);
				$attr = $result->fetch_all(); 
				foreach($attr as $v)
				{
					echo " <option value='{$v[0]}' >{$v[1]}</option> ";
				} 	
		 	?>
			         
	     </select>
		
		
		
		
		<br />
		生日：<input type="text" name="birthday" /><br />
		<input type="submit"  value="提交"/>
	</form>

　　

同路径下新建tianjiachuli.php

<?php
	$code = $_POST["code"];
	$name = $_POST["name"];
	$sex = $_POST["sex"];
	$nation = $_POST["nation"];
	$birthday = $_POST["birthday"];
	$db = new mysqli("localhost","root","","12345");
	$sql = "insert into info values('{$code}','{$name}','{$sex}','{$nation}','{$birthday}')";
	$r = $db->query($sql);
	if($r)
	{
		header("location:xinxi.php");
	}
	else
	{
		echo "添加失败";
	}
?>

　　

修改数据：

同路径下新建xiugai.php

<?php
$code = $_GET["code"];
$db = new MySQLi("localhost","root","","12345");
$sql = "select * from info where code='{$code}'";

$result = $db->query($sql);
$attr = $result->fetch_row();
?>


<h1>修改数据</h1>
	  <form action="xiugaichuli.php" method="post">
		<input type="hidden" name="code"  value="<?php echo $attr[0] ?>" />  <br />
		姓名：<input type="text" name="name" value="<?php echo $attr[1] ?>" /><br />
		性别：<input type="radio" name="sex" value="1" <?php echo $attr[2]?"checked='checked'":""; ?> />男    <input type="radio" name="sex" value="0" <?php echo $attr[2]?"":"checked='checked'"; ?> />女 <br />
		
		民族：  
		 <select  name="nation">
		 	<?php   
			
				$sqln = "select * from nation";
				$result = $db->query($sqln);
				$atter = $result->fetch_all(); 
				foreach($atter as $v)
				{
					if($attr[3]==$v[0])
			         {
			 	         echo "<option selected='selected' value='{$v[0]}'>{$v[1]}</option>";
			         }
			         else
			         {
					 	echo " <option value='{$v[0]}' >{$v[1]}</option> ";
					 }
					
				} 	
		 	?>
			         
	     </select>
		
		
		
		
		<br />
		生日：<input type="text" name="birthday" value="<?php echo $attr[4] ?>" /><br />
		<input type="submit"  value="修改"/>
	</form>

　　

同路径下新建xiugaichuli.php

<?php
	$code = $_POST["code"];
	$name = $_POST["name"];
	$sex = $_POST["sex"];
	$nation = $_POST["nation"];
	$birthday = $_POST["birthday"];
	$db = new mysqli("localhost","root","","12345");
	$sql = "update info set name='{$name}',sex={$sex},nation='{$nation}',birthday='{$birthday}' where code='{$code}'";
	$r = $db->query($sql);
	if($r)
	{
		header("location:xinxi.php");
	}
	else
	{
		echo "修改失败";
	}
?>

　　

显示结果：

修改为：