Question

我不明白为什么我的查询不起作用？

他们立即转到else并跳过if块来测试返回的行数。我一直收到3条消息，说我有一个以ap / es / wb开头的项目，我不知道为什么。我真的坚持这个。

$username="root";
$password="23994";
$database="urenselector";
mysql_connect("localhost",$username,$password);
mysql_select_db($database) or die( "Unable to select database");

//button bezig joey mikkers
$query= "SELECT projecten.keuze_selectie, projecten.do, projecten.vak, projecten.uren,        projecten.proj_id,".
" urenlijst.username, urenlijst.proj_status FROM projecten,urenlijst Where projecten.proj_id = urenlijst.proj_id AND urenlijst.username = '".$_SESSION['user']."'";

 //die($query);

$result=mysql_query($query);
//$button_name = "btn".$row['proj_id'];
//if(isset($_GET[$button_name]))
//{

if($result)
{
    $query2= "SELECT urenlijst.proj_status FROM urenlijst WHERE proj_status = 'b' and username = " . $_SESSION['user'];
    $result2=mysql_query($query2) or die(mysql_error());
    $numrows = mysql_num_rows($result2);
    $query3= "SELECT projecten.vak, urenlijst.username, urenlijst.proj_id, urenlijst.proj_status FROM projecten, urenlijst WHERE vak = 'AP' and proj_status = 'b' and username = " . $_SESSION['user'];
        $result3=mysql_query($query3);
        $numrows2 = mysql_num_rows($result3);
        $query4= "SELECT projecten.vak, urenlijst.username, urenlijst.proj_id, urenlijst.proj_status FROM projecten, urenlijst WHERE vak = 'ES' and proj_status = 'b' and username = " . $_SESSION['user'];
        $result4=mysql_query($query4);
        $numrows3 = mysql_num_rows($result4);
        $query5= "SELECT projecten.vak, urenlijst.username, urenlijst.proj_id, urenlijst.proj_status FROM projecten, urenlijst WHERE vak = 'WB' and proj_status = 'b' and username = " . $_SESSION['user'];
        $result5=mysql_query($query5);
        $numrows4 = mysql_num_rows($result5);

        while($row = mysql_fetch_array($result))
        {
            $button_name = "btn".$row['proj_id'];
            if(isset($_GET[$button_name]))  
            {

                //print_r($numrows);
                $message = "";
                $message1 = "";
                $message2 = "";
                if($numrows3 < 1)
                    {
                        echo 'test1';
                        if($numrows > 2)
                            {
                                $message = "je hebt al drie projecten geselecteerd met status \"bezig\"";
                            }
                            else
                            {                   
                                mysql_query("UPDATE urenlijst SET proj_status = 'b' WHERE proj_id = ".$row['proj_id']);
                            }
                    }
                    else
                    {
                    $message2 = "je hebt al een project geselecteerd met het vak ES";
                    }   
                    if($numrows4 < 1)
                    {   
                    echo 'test2';
                            if($numrows > 2)
                            {
                                $message = "je hebt al drie projecten geselecteerd met status \"bezig\"";
                            }
                            else
                            {                   
                                mysql_query("UPDATE urenlijst SET proj_status = 'b' WHERE proj_id = ".$row['proj_id']);
                            }
                    }
                    else
                    {
                    $message1 = "je hebt al een project geselecteerd met het vak WB";   
                    }   
                if($numrows2 < 1)
                {           
                echo 'test3' . $numrows2;                                                       
                            if($numrows > 2)
                            {
                                $message = "je hebt al drie projecten geselecteerd met status \"bezig\"";
                            }
                            else
                            {                   
                                mysql_query("UPDATE urenlijst SET proj_status = 'b' WHERE proj_id = ".$row['proj_id']);
                            }
                        }
                        else
                        {
                        $message = "je hebt al een project geselecteerd met het vak AP";    
                        }   


                }


            }
        }

Answer 1

您使用了$ _SESSION，请在查询中使用之前检查该数组并输入

 session_start(); // at your first line of script

我不明白我的mysql查询永远不会返回任何行

1 个答案: