Jump to content

php code


Sabrine
 Share

Recommended Posts

I got these codes from someone and it looks different from w3school course. What's the difference? 

Connection:

<?php
/*
to avoid writing code to connect to the db in each file:
1-write the DB connexion code in a php file e.g: dbLogin.php
2-call that php file when needed with include e.g: include ('dbLogin.php') or include 'dbLogin.php'
There are also include_once, require and require_once which can be used instead of include
*/
        $conn=mysqli_connect("localhost","root","","registration");
        if (!$conn)
        {
            die("connexion failed".mysqli_connect_error());
        }

?>

 Construct list

                               <?php

                                                // Construct School Name list from the database

                                                $request="SELECT school_name FROM school ";

                                                $result=mysqli_query($conn,$request);

                                                $option='';

                                                while($line=mysqli_fetch_assoc($result))

                                                {

                                                $option.= "<option value=\"".$line['school_name']."\">".$line['school_name']."</option>";

                                                }

                               ?>

 

 

Displaying list :

        <?php

                              

                                               //Display the Students details(Student  NCN First Name Last Name City Name School Name)

                                               $req="select student_cin, first_name, last_name, city_name, school_name

                                               from  student, school, city

                                               where student.postal_code=city.postal_code

                                               and student.school_id=school.school_id";

                                               $res = mysqli_query($conn,$req);

                                               if(mysqli_num_rows($res)>0)

                                               {

                                                               while ($line=mysqli_fetch_assoc($res))

                                                                              {

                                                                                              echo"<tr> <td>".$line['student_cin'].

                                                                                              "</td><td>".$line['first_name']."</td><td>".

                                                                                              $line['last_name']."</td><td>".$line['city_name'].

                                                                                              "</td><td>".$line['school_name']."</td></tr>";

                                                                              }

                                               }

                                               else

                                               {

                                                               echo"no results found";

                                               }

                              

                               ?>

                              

Closing

                               <?php

                                               mysqli_close($conn);

                               ?>

 

ADD or EDIT

 

if(!empty($_POST['Student_ID']) AND !empty($_POST['FN']) AND !empty($_POST['LN']) AND !empty($_POST['city'])AND !empty($_POST['school']))

{

 $FN=$_POST['FN'];

 $Student_ID=$_POST['Student_ID'];

 $LN=$_POST['LN'];

 $city_n=$_POST['city'];

 $school_n=$_POST['school'];

 

 

 //We assume that the school_name and city_name entered in the form already exist in the tables school and city

 //get the city postal code

                $qc="SELECT postal_code FROM city WHERE city_name='$city_n'";

                $rc=mysqli_query($conn,$qc);

                if (mysqli_num_rows($rc) == 1)

                {

                               $line=mysqli_fetch_assoc($rc);

                               $city_c=$line['postal_code'];

                }

 //get the school postal code

 

                $qs="SELECT school_id FROM school WHERE school_name='$school_n'";

                $rs=mysqli_query($conn,$qs);

                if (mysqli_num_rows($rs) == 1)

                {

                               $line=mysqli_fetch_assoc($rs);

                               $school_c=$line['school_id'];

                }

 

 

// SQL query

$query="SELECT student_cin FROM student WHERE student_cin='$Student_ID'";

$result=mysqli_query($conn,$query);

if (mysqli_num_rows($result) == 0)

                {

                                 $req="INSERT INTO student VALUES('$Student_ID','$FN','$LN','$city_c','$school_c')";

                                $res=mysqli_query($conn,$req);

                                //if the insertion is done

                                echo "<br> res= ".$res."   ";

                                if ($res)

                                               {

                                                echo "insertion successful";

                                               }

                                else

                                                echo "Problem when inserting student ". mysqli_error($conn);

                }

               

                else

                {              $request="update student SET first_name='$FN',last_name='$LN',postal_code='$city_c', school_id='$school_c' WHERE student_cin='$Student_ID'";

                                $res=mysqli_query($conn,$request);

                                //if the update is done

                                if ($res)

                                {

                                echo "student updated";}

                                // else

                                else echo "problem updating student". mysqli_error($conn);

                }

}

else

echo"<script type=\"text/javascript\"> alert('Please fill the form!')</script>";

header('location: index.php');

?>

REMOVE :

$sc=$_POST['SC_name'];

                               //get the school id

                               $reqid="select school_id from school where school_name='$sc'";

                               $resid=mysqli_query($conn,$reqid);

                               $line=mysqli_fetch_assoc($resid);

                               $sid=$line['school_id'];

                              

                               echo 'school id'. $sid. '<br>';

                               //delete students from that school

                               $reqs="delete from student where school_id='$sid'";

                               $ress=mysqli_query($conn,$reqs);

                                               if ($ress)

                                                {

                                                echo "student deleted";

                                                }

                                                // else

                                                else echo "problem deleting student". mysqli_error($conn);

                                

                               //delete school now

                 

                               $req1="delete from school where school_name='$sc'";

                               $res1=mysqli_query($conn,$req1);

                               if ($res1)

                                {

                                echo "school deleted";}

                                // else

                                else echo "problem deleting school". mysqli_error($conn);

                              

                              

                               header('location: index.php');

 

               

Link to comment
Share on other sites

Hi Sabrine!

When posting code try using the code block feature so we can read it easier. (Try editing your post)

XcQfW3F.png

Perhaps a more step-by step approach would be in order.
Are you in some way confused by any of these sections?
Do any of these sections not function as you thought they would?

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...