php实现数据库的增删改查

1.查询:

数据的显示,这里就可以嵌入php来进行数据的输出

<!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>

<table width="100%" border="1" cellpadding="0" cellspacing="0">

<tr>

<td>代号</td>

<td>名称</td>

<td>性别</td>

<td>生日</td>

<td>班级</td>

<td>操作</td>

</tr>

<?php

$db = new MySQLi("localhost","root","12345678","heiheihei");

//连接数据库

$sql = "select * from student ";

//写sql语句

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

//执行sql语句返回给r

if($r)//条件

{

while ($attr = $r->fetch_row())

{

$ssex = "";

if($attr[2])

{

$ssex = "男";

}

else

{

$ssex = "女";

}

echo

"

<tr>

<td>{$attr[0]}</td>

<td>{$attr[1]}</td>

<td>{$ssex}</td>

<td>{$attr[3]}</td>

<td>{$attr[4]}</td>

//添加一个单击事件,防止不小心删掉

<td><a onclick=\"return confirm('确定要删除吗???')"

href='shanchu.php?sno={$attr[0]}'>删除</a>

<a href='xiugai.php?sno={$attr[0]}'>修改</a> </td> </tr>"; } } ?>

</table>

<a href="tianjia.php" rel="external nofollow" >添加页面</a>

</body>

</html>

2.删除的处理页面

删除时是链接到删除处理页面的,所以还要写一个删除处理页面:

<?php

$aaa = $_GET ["sno"]; //删除方式使用的get,照旧

$db = new mysqli("localhost","root","12345678","heiheihei");

//连接...

$sql = "delete from student WHERE sno='{$aaa}'";

//写sql语句,sno主键

if($db->query($sql)) //执行sql语句

{

header("location:text.php");

//删完回去表页面

}

else{

echo "删除失败";

}

?>

来张效果图:

3.添加数据:

点击即可进入添加页面

添加页面:

<body>

<h1>添加</h1>

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

<div>代号:<input type="text" name="sno"/></div>

<div>名字:<input type="text" name="sname"/></div>

<div>性别: <input type="radio" value="1" name="sex" />男

<input type="radio" value="0" name="sex"/>女</div>

<div>日期:<input type="text" name="sbirthday"/></div>

//创建表时性别是用的1或2来表示的,要是进行修改不知道1或2代表了什么,所以就要进行处理,处理成用户能够明白的男和女

<div>班级:

<select name="class">

<?php

$db= new MYSQLi("localhost","root","12345678","heiheihei");

//连接...

$sql = " select * from class ";

//写sql...

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

//执行...返回...

while($arr = $r->fetch_row())

{

echo "<option value='{$arr[0]}'>{$arr[1]}</option>";

//添上以后回表页面

}

?>

</select>

</div>

<div><input type="submit" value="添加"/></div>

</form>

</body>

添加也需要一个处理页面来判断添加:

<?php

$sno = $_POST["sno"];

//$_POST 变量用于收集来自 method="post" 的表单中的值。

$sname = $_POST["sname"];

$ssex = $_POST["ssex"];

$sbirthday = $_POST["sbirthday"];

$class = $_POST["class"];

$db = new mysqli("localhost","root","12345678","heiheihei");

$sql = "insert into student VALUES ('{$sno}','{$sname}','{$ssex}','{$sbirthday}','{$class}')";

//向数据库中添加写的数据

if($db->query($sql))

{

header("location:text.php");

//header() 函数向客户端发送原始的 HTTP 报头。

}

else {

echo "添加失败";

}

?>

效果图:

4.修改数据:主键不可修改!!

<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>修改</h1>

<?php

$sno = $_GET{"sno"};

$db = new mysqli("localhost","root","12345678","heiheihei");

$sql = "select * from student WHERE sno='{$sno}'";

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

$arr = $r->fetch_row();

?>

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

<div>代号:<input readonly="readonly" type="text" name="sno" value="<?php

echo $arr[0];

?>"/></div>

//readonly只可读

<div>名称:<input type="text" name="sname" value="<?php echo $arr[1]; ?>"/></div> <div>性别: <input type="radio" name="ssex" value="1" <?php echo $arr[2]?"checked='checked'":""; ?>/>男 <!-- 三元运算符,如果性别=ture,默认值就在男上面,否则空--> <input type="radio" name="ssex" value="0" <?php echo $arr[2]?"":"checked='checked'"; ?>/>女 </div> <div>日期:<input type="text" name="sbirthday" value="<?php echo $arr[3]; ?>"/></div> <div>班级:<select name="class">

//value取默认值

<?php

$sclass = "select * from class";

$rclass = $db->query($sclass);

while($attr = $rclass->fetch_row())

//取到的班级信息

{

//判断将要输出的班级是不是和该人员的是否相同

if($arr[4]==$attr[0])//arr是班级名,attr是班级的代号,俩表

{

echo "<option value = '{$attr[0]}' selected='selected'>{$attr[1]}</option>";

}

else{

echo "<option value = '{$attr[0]}'>{$attr[1]}</option>";

}

}

?>

</select></div>

<div><input type="submit" value="修改完毕"/></div>

</form>

</body>

</html>

]

修改的处理页面:

<?php

$sno = $_POST["sno"];

$sname = $_POST["sname"];

$ssex = $_POST["ssex"];

$sbirthday = $_POST["sbirthday"];

$class = $_POST["class"];

$db = new mysqli("localhost","root","12345678","heiheihei");

$sql = "update student set sname='{$sname}',

ssex='{$ssex}',

sbirthday='{$sbirthday}',

class='{$class}' WHERE sno='{$sno}'";

//看一下是不是传递过来的sno值;

if($db->query($sql))

{

header("location:text.php");

}

else{

echo "修改失败";

}

?>

修改的效果图:

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