PHP——0127加登录页面，加查询，加方法，加提示框

数据库mydb

表格info,nation,login

效果

<!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>
<h1>登陆</h1>
<form action="0127lianxi.php" method="post">
<div> <span>用户名：</span><input type="text" name="uid" /></div>
<div> <span>密  码：</span><input type="text" name="pwd" /></div>
<div><input type="submit" name="btn" value="登录" /></div>
</form>
</body>
</html>
0127denglu.php
<!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>
<h1>主页面</h1>
<form action="0127lianxi.php" method="post">
<div style="100%; height:40px">
    <span>代号：</span>
    <input type="text"  name="code"/> &nbsp;&nbsp;
    <span>姓名：</span>
    <input type="text"  name="name"/>&nbsp;&nbsp;
    <input type="submit" value="查询" name="btn"/>
</div>
</form>

<div>
<?php

//登录代码
/*include("0127mydbda.php");

$uid=$_POST["uid"];
$pwd=$_POST["pwd"];

$dl = new mydbda();

$sqldl = "select * from login where UserName='{$uid}' and Password='{$pwd}'";

$jieguo = $dl->select($sqldl,"CX","mydb");
if($jieguo=="")
{
    header("Location:0127denglu.php");
}
else
{
}*/

/*if($rowdl=$jieguo->fetch_row())//与后面的return $result对应
{
}
else
{
    header("Location:0127denglu.php");
}*/

/*if($dl->denglu($uid,$pwd)=="ok")//通过上面方法优化
{
}
else
{
    header("Location:0127denglu.php");
}*/

    //查询代码
    
    $strsel = "";

    if(@$_POST["code"] != null)
    {
        $strsel = " where Code = '".$_POST["code"]."'";//where前面必须有空格
        
        if(@$_POST["name"]!= null)
        {
            $strsel = " where Code='".$_POST["code"]."' and Name like '%".$_POST["name"]."%'";
        }
        //else {$strsel = " where Code = '".$_POST["code"]."'";}可以省略
    }
    else
    {
        if(@$_POST["name"]!= null)
        {
            $strsel = " where Name like '%".$_POST["name"]."%'";
        }
        //else{$strsel="";}都为空执行最开始的$strsel
    }


    

//1.连接数据可以
$db = new mysqli("localhost","root","123","mydb");
//2.判断是否连接成功
if(mysqli_connect_error())
{
    echo "连接失败";
}
else
{
    //3.写sql语句
    $sql = "select * from Info".$strsel;
    //4.执行sql语句
    $result=$db->query($sql);
    //5.处理数据，遍历数据
    
        echo "<table width=90% cellpadding=0 cellspacing=0 border=1>";
        echo "<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>";
        while($row=$result->fetch_row())
        {
            //改性别
            $sex=$row[2]?"男":"女";    
            //改民族
            $nation=NationName($db,$row[3]);
            //改生日
            $birthday=date("Y年m月d日",strtotime($row[4]));        
            
            echo "<tr bgcolor='#00FFCC'> <td>{$row[0]}</td> <td>{$row[1]}</td> <td>{$sex}</td> <td>{$nation}</td> <td>{$birthday}</td> <td><a href='0127sc.php?code=".$row[0]."' onclick="return confirm('确定删除吗？')">删除</a>&nbsp;&nbsp;<a href='0127xiugai.php?code=".$row[0]."'>修改</a></td> </tr>";//" "双引号里出现双引号转义字符用
            
            }
          echo "</table>";
}

function NationName($db,$code)
{
    //写sql语句
    $sql="select * from nation where code='{$code}'";
    //4.执行sql语句
    $result=$db->query($sql);
    //5.处理数据
    if($row=$result->fetch_row())
    {
        return $row[1];
        }
    else 
    {
        return "";
        }
    
    }

?>
</div>
<div><a href="0127tianjia.php">添加数据</a></div>
<form>
<input type="submit" value="提交" onclick="return confirm('确定么')" />
</form>
</body>
</html>
0127lianxi.php
<!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>
<?php
class mydbda
{
    var $host="localhost";
    var $username="root";
    var $password="123";
    var $database="mydb";
    
    /*
       功能：执行SQL语句，返回结果
       参数：$sql:要执行的SQL语句
             $type：SQL语句的类型，CX代表查询，QT代表其他
             $data:要操作的数据库
       返回值：如果是查询，返回结果集
             如果是其他语句，执行成功返回ok,失败返回no
    */
    
    function select($sql,$type,$data)
    {
        
        $db=new mysqli($this->host,$this->username,$this->password,$data);
        if(mysqli_connect_error())
        {
            echo "连接失败";
            exit;
            }
        else
        {
            $result=$db->query($sql);
            if($type=="CX")
            {
                //return $result;  用拼接字符串替换掉
                $str="";
                while($row=$result->fetch_row())
                {
                    for($i=0;$i<count($row);$i++)
                    {
                        $str=$str.$row[$i]."^";
                
                    }
                    $str=substr($str,0,strlen($str)-1);//去掉"|"前面的"^"

                    $str = $str."|";
                    //n001^汉族^|n002^回族^|n003^苗族^|
                } 
                $str=substr($str,0,strlen($str)-1);//去掉"|"
                return $str;
        
            }
            else
            {
               if($result)
               {
                 return "ok";  
                }    
                else
                {
                    return "no";
                    }
            }
            
        }
    }
    
   /*function denglu($uid,$pwd)
    {
        $db=new mysqli($this->host,$this->username,$this->password,$this->database);
        if(mysqli_connect_error())
        {
            echo "连接失败";
            exit;
            }
        else
        {
            $sql="select * from login where UserName='{$uid}' and Password='{$pwd}'" ;
            $result=$db->query($sql);
            if($row=$result->fetch_row())
            {
            return "ok";
            }
            else
            {
                return "no";
                }
            
        }
        
    }*/
    
}

?>
</body>
</html>
0127mydb.php
<!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>
<h1>添加页面</h1>
<form action="0127tjchuli.php" method="post">
<div><span>代号：</span><input type="text" name="code" /></div>
<div><span>姓名：</span><input type="text" name="name" /></div>
<div><span>性别：</span><input type="radio" checked="checked" name="sex" value="true"/>男
<input type="radio" name="sex" value="false"/>女
</div>
<div>
<span>民族:</span>
<select name="nation">
    <?php
    $db=new mysqli("localhost","root","123","mydb");
    if(mysqli_connect_error())
    {
        echo "连接错误";
        }
    else
    {
        $sql="select * from nation";
        $result=$db->query($sql);
        while($row=$result->fetch_row())
        {
            echo "<option value='{$row[0]}'>{$row[1]}</option>";
            }
        
        }
    
    ?>
     </select>
     
</div>
<div><span>生日：</span><input type="text" name="birthday"/></div>
<div><input type="submit" value="添加" />&nbsp;&nbsp;<a href="0127lianxi.php">返回</a></div>
</form>
</body>
</html>
0127tianjia.php
<!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>
<?php
$code=$_GET["code"];
$db=new mysqli("localhost","root","123","mydb");
if(mysqli_connect_error())
{
    echo "连接错误";
    }
    else
    {
        $sql="delete from Info Where code='{$code}'";
        $result=$db->query($sql);
        if($result)
        {
            header("Location:0127lianxi.php");
            }
            else
            {
                echo "删除失败";
                }
        
        }

?>
</body>
</html>
0127sc.php
<!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>
<h1>修改页面</h1>
<?php
$code=$_GET["code"];
$db=new mysqli("localhost","root","123","mydb");
if(mysqli_connect_error())
{
    echo "连接错误";
    }
else
{
    $sql="select * from Info where code='".$code."'";
    $result=$db->query($sql);
    $row=$result->fetch_row();
}

?>
<form action="0127xgchuli.php" method="post">
<div><span>代号：</span><input type="text" name="code" value="<?php echo $row[0] ?>" readonly="readonly"/></div>
<div><span>姓名：</span><input type="text" name="name" value="<?php echo $row[1] ?>" /></div>
<div><span>性别：</span><input type="radio" <?php echo (bool)$row[2]?"checked='checked'":"" ?> name="sex" value="true"/>男
<input type="radio" name="sex" value="false" <?php echo !(bool)$row[2]?"checked='checked'":"" ?>/>女
</div>
<div>
<span>民族:</span>
<select name="nation">
    <?php
    $db=new mysqli("localhost","root","123","mydb");
    if(mysqli_connect_error())
    {
        echo "连接错误";
        }
    else
    {
        $sql="select * from nation";
        $result=$db->query($sql);
        while($rownation=$result->fetch_row())
        {
         if($rownation[0]==$row[3])
         {
             echo "<option selected='selected' value='{$rownation[0]}' >{$rownation[1]}</option>";
             }
             else
             {
                 echo "<option value='{$rownation[0]}'>{$rownation[1]}</option>";
                 }
            }
        
        }
    
    ?>
     </select>
     
</div>
<div><span>生日：</span><input type="text" name="birthday" value="<?php echo $row[4]  ?>"/></div>
<div><input type="submit" value="修改" />&nbsp;&nbsp;<a href="0127lianxi.php">返回</a></div>
</form>
</body>
</html>
0127xiugai.php
<!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>
<?php
$code=$_POST["code"];
$name=$_POST["name"];
$sex=$_POST["sex"];
$nation=$_POST["nation"];
$birthday=$_POST["birthday"];
//1.造连接对象
$db=new mysqli("localhost","root","123","mydb");
//2.判断是否连接成功
if(mysqli_connect_error())
{
    echo "连接失败";
    }
    else
    {
        //3.写语句
        $sql="update info set name='".$name."',sex='".$sex."',nation='".$nation."',birthday='".$birthday."'where code='".$code."'";
        //4.执行sql语句
        $result = $db->query($sql);
        //判断是否修改成功
        if($result)
        {
            header("Location:0127lianxi.php");
            }
            else
            {
                echo "修改失败！";
                }
        
        }

?>
</body>
</html>
0127xgchuli.php
<!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>
<?php
$code=$_POST["code"];
$name=$_POST["name"];
$sex=$_POST["sex"];
$nation=$_POST["nation"];
$birthday=$_POST["birthday"];
 
 $db=new mysqli("localhost","root","123","mydb");
 if(mysqli_connect_error())
 {
     echo "连接错误";
     }
else
{
    $sql="insert into Info values('{$code}','{$name}',{$sex},'{$nation}','{$birthday}')";
    $result=$db->query($sql);
    if($result)
    {
        header("Location:0127tianjia.php");
        }
    else
    {
        echo "添加失败";
        }
    }



?>
</body>
</html>
0127tjchuli.php

 0127tjchuli.php中的$sex写法要注意bit和varchar的变量写法

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原文地址：https://www.cnblogs.com/Chenshuai7/p/5196929.html