利用PHP连接数据库——实现用户数据的增删改查的整体操作实例

main页面(主页面)

<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
$db = new MySQLi("localhost","root","","mydb");
if(mysqli_connect_error()){

　　die("连接失败");

}
$sql = "select * from Info";
$result = $db->query($sql);
$attr = $result->fetch_all();
foreach($attr as $v)
{
    $sex = $v[2]? '男':'女';　　//三元运算符判断性别
    $sql = "select Name from Nation where Code ='$v[3]'";
    $result = $db ->query($sql);
    $attr = $result->fetch_assoc();
    echo "<tr>
    <td>{$v[0]}</td>
    <td>{$v[1]}</td>
    <td>{$sex}</td>
    <td>{$attr['Name']}</td>
    <td>{$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>

Add(添加数据页面)

<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","","mydb");
        if(mysqli_connect_error()){

　　die("连接失败");

　　}
         $sql = "select * from Nation";
         $r = $db->query($sql);
         $att = $r->fetch_all();
         foreach($att 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>

AddChuLi页面（添加数据处理页面）

<?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","","mydb");
if(mysqli_connect_error()){

　　die("连接失败");

}

$sql = "insert into Info values('{$code}','{$name}','{$s}','{$nation}','{$birthday}')";　　//添加数据语句
$result = $db->query($sql);
if($result)
{
    header("location:main.php");　　//php跳转页面方式
}
else
{
    echo "添加失败！";
}

DeleteChuLi页面（删除数据处理页面）

<?php
$code = $_GET["code"];
$db = new MySQLi("localhost","root","","mydb");
if(mysqli_connect_error()){

　　die("连接失败");

}

$sql = "delete from Info where Code ='{$code}'";　　//删除语句
$r = $db->query($sql);
if($r)
{
    header("location:main.php");
}
else
{
    echo "删除失败！";
}

Update页面（修改数据页面）

<h1>修改数据</h1>
<?php
$code = $_GET["code"];
$db = new MySQLi("localhost","root","","mydb");
if(mysqli_connect_error()){

　　die("连接失败");

}

$sql1 = "select * from Info where Code='{$code}'";
$r1 = $db->query($sql1);
$att1 = $r1->fetch_row();
?>

<form action="UpdateChuLi.php" method="post">
    <div>代号：<input type="hidden" name="code" value="<?php echo $att1[0] ?>" /></div>
    <div>姓名：<input type="text" name="name" value="<?php echo $att1[1] ?>" /></div>
    <div>性别：
         <input type="radio" value="男" name="sex" <?php echo $att1[2] ? "checked='checked'" : ""; ?> />男
         <input type="radio" value="女" name="sex" <?php echo $att1[2] ? "" : "checked='checked'"; ?> />女
    </div>
    <div>民族:
         <select name="nation">
         <?php
         $db = new MySQLi("localhost","root","","mydb");
         if(mysqli_connect_error()){

　　die("连接失败");

　　}
         $sql = "select * from Nation";　　//查询nation一组数据
         $r = $db->query($sql);
         $att = $r->fetch_all();
         foreach($att as $v)
         {
             if($att1[3]==$v[0])
             {
                 echo "<option value='{$v[0]}' selected='selectec' >{$v[1]}</option>";　　
             }
             else
             {
                 echo "<option value='{$v[0]}'>{$v[1]}</option>";
             }
             
         }
         ?>
         </select>
    </div>
    <div>生日：<input type="text" name="birthday" value="<?php echo $att1[4] ?>"/></div>
    <div><input type="submit" value="修改数据" /></div>
</form>

UpdateChuLi页面（修改数据处理页面）

<?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","","mydb");
if(mysqli_connect_error()){

　　die("连接失败");

}

$sql = "update Info set Name='{$name}',Sex={$s},Nation='{$nation}',Birthday='{$birthday}' where Code='{$code}'";　　//修改数据语句
$r = $db->query($sql);
if($r)
{
    header("location:main.php");
}
else
{
    echo "修改失败！";
}