PHP访问数据，增删改

主页面

<h1>主页面</h1>

<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>";
}


?>

增添数据

add.php

<h1>添加数据</h1>
<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>

addchuli.php

<?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！";
}

删除数据

delete.php

<?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！";
}

修改主页

update.php

<body>
<h1>修改数据</h1>

<?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>
</body>

updatechuli.php

<?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！";
}