使用PHP连接数据库_实现用户数据的增删改查的整体操作示例

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" rel="external nofollow" >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","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","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！";

}

Update页面（修改数据页面）

<h1>修改数据</h1>

<?PHP

$code = $_GET["code"];

$db = new MysqLi("localhost","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","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>

ateChuLi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","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！";

}