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php数据库的增删改查

来源:互联网

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rif($r)//条件{  while ($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(&#39;确定要删除吗???&#39;)" href=&#39;shanchu.php?sno={$attr[0]}&#39;>删除</a> <a href=&#39;xiugai.php?sno={$attr[0]}&#39;>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...$sql = "delete from student WHERE sno=&#39;{$aaa}&#39;";//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:

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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" >  <p>代号:<input type="text" name="sno"/></p>  <p>名字:<input type="text" name="sname"/></p>  <p>性别: <input type="radio" value="1" name="sex" />男    <input type="radio" value="0" name="sex"/>女</p>  <p>日期:<input type="text" name="sbirthday"/></p>//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  <p>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 = $r->fetch_row())    {      echo "<option value=&#39;{$arr[0]}&#39;>{$arr[1]}</option>";      //添上以后回表页面    }    ?>   </select>  </p>  <p><input type="submit" value="添加"/></p></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");$sql = "insert into student VALUES (&#39;{$sno}&#39;,&#39;{$sname}&#39;,&#39;{$ssex}&#39;,&#39;{$sbirthday}&#39;,&#39;{$class}&#39;)";//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");$sql = "select * from student WHERE sno=&#39;{$sno}&#39;";$r = $db->query($sql);$arr = $r->fetch_row();?> <form action="update.php" method="post">  <p>代号:<input readonly="readonly" type="text" name="sno" value="<?phpecho $arr[0];?>"/></p>//readonly只可读 <p>名称:<input type="text" name="sname" value="<?php echo $arr[1]; ?>"/></p> <p>性别: <input type="radio" name="ssex" value="1" <?php echo $arr[2]?"checked=&#39;checked&#39;":""; ?>/>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=&#39;checked&#39;"; ?>/>女 </p> <p>日期:<input type="text" name="sbirthday" value="<?php echo $arr[3]; ?>"/></p> <p>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]==$attr[0])//arr是班级名,attr是班级的代号,俩表        {          echo "<option value = &#39;{$attr[0]}&#39; selected=&#39;selected&#39;>{$attr[1]}</option>";        }        else{          echo "<option value = &#39;{$attr[0]}&#39;>{$attr[1]}</option>";        }      }      ?>     </select></p>  <p><input type="submit" value="修改完毕"/></p></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");$sql = "update student set sname=&#39;{$sname}&#39;,ssex=&#39;{$ssex}&#39;,sbirthday=&#39;{$sbirthday}&#39;,class=&#39;{$class}&#39; WHERE sno=&#39;{$sno}&#39;";//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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数据库增删改查