problem with delete query

doforumda · August 15, 2008

hello everyone,

i wrote a php script that displays all the data from the database in a table. i put a checkbox in front of all the datas. this checkbox purpose is to delete the selected data from the database. but i dont know how to do that. i wrote a script but it deosnt work. pleaseeee help me if anybody knows about this. if you need script then let me know i ll provide the script for you

thanks in advance

pocobueno1388 · August 15, 2008

Show us your code so we can tell you what your doing wrong.

pocobueno1388 · August 15, 2008

I wrote up an example script for you to reference, although I didn't test it for errors.

<?php

//check if they pressed delete button
if (isset($_POST['delete'])){

   //make sure they checked something
   if (!empty($_POST['ids'])){
   
      //execute delete query
      $query = "DELETE FROM table WHERE id IN(" .implode(', ', {$_POST['ids']}) . ")";
      
      if ($result = mysql_query($query))
      	 echo "Successfully Deleted";
      else
         echo mysql_error();
         
    } else {
    	echo "Nothing Selected to Delete";
    }
      
}

//Select info from DB
$query = mysql_query("SELECT id FROM table")or die(mysql_error());

//create checkboxes

echo "<form>";

while ($row = mysql_fetch_assoc($query)){
   echo "<input type='checkbox' name='ids[]' value='{$row['id']}' />";
}

echo "<input type='submit' name='delete' value='Delete' />";
echo "</form>";

?>

doforumda · August 15, 2008

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>University</title>

</head>

<body>

<?php

if(!$name && !$sfield && !$sroll)

{

echo "Please Enter NAME or FIELD or ROLL NUMBER";

}

$db = mysql_connect("localhost");

mysql_select_db("university",$db);

if($name)

{

echo "<h1>Searched By Name:</h1>";

$query = "select * from nu where name like '%".$name."%'";

$result = mysql_query($query);

echo "<table width = '100%' border = '0'";

echo "<tr bgcolor = 'lightblue'><td>Select</td>

<td>Father Name</td>

<td>phone No</td>

<td>Address</td>

<td>Field</td>";

while($record = mysql_fetch_assoc($result))

{

echo "<tr>

<td width = 350>".$record["rollNo"]."</td>

<td>".$record["name"]."</td>

<td>".$record["fatherName"]."</td>

<td>".$record["phoneNo"]."</td>

<td>".$record["address"]."</td>

<td>".$record["field"]."</td>";

}

if($sfield)

{

echo "<h1>Searched By Field:</h1>";

$query = "select * from nu where field like '%".$sfield."%'";

$result = mysql_query($query);

echo "<table width = '100%' border = '0'";

echo "<tr bgcolor = 'lightblue'><td>Select</td>

<td>Father Name</td>

<td>phone No</td>

<td>Address</td>

<td>Field</td>";

while($record = mysql_fetch_assoc($result))

{

echo "<tr>

<td width = 350>".$record["rollNo"]."</td>

<td>".$record["name"]."</td>

<td>".$record["fatherName"]."</td>

<td>".$record["phoneNo"]."</td>

<td>".$record["address"]."</td>

<td>".$record["field"]."</td>";

}

if($sroll)

{

echo "<h1>Searched By Roll Number:</h1>";

$query = "select * from nu where rollNo like ".$sroll."";

$result = mysql_query($query);

echo "<table width = '100%' border = '0'";

echo "<tr bgcolor = 'lightblue'><td>Select</td>

<td>Father Name</td>

<td>phone No</td>

<td>Address</td>

<td>Field</td>";

while($record = mysql_fetch_assoc($result))

{

echo "<tr>

<td>".$record["rollNo"]."</td>

<td>".$record["name"]."</td>

<td>".$record["fatherName"]."</td>

<td>".$record["phoneNo"]."</td>

<td>".$record["address"]."</td>

<td>".$record["field"]."</td>";

}

?>

<a href = "search.html">If you want to search more then Please Click HERE</a>

<a href = "adddata_nu.html">If you want to add more then Please Click HERE</a>

</form>

</body>

</html>

doforumda · August 15, 2008

how to write delete script for above script

pleasee help me

pocobueno1388 · August 15, 2008

Give this a try

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>University</title>
</head>

<body>
<p>
<form name="form1" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">

  <?php
  
//check if they pressed delete button
if (isset($_POST['submit'])){

   //make sure they checked something
   if (!empty($_POST['delete'])){
   
      //execute delete query
      $query = "DELETE FROM table WHERE id IN(" .implode(', ', {$_POST['delete']}) . ")";
      
      if ($result = mysql_query($query))
      	 echo "Successfully Deleted";
      else
         echo mysql_error();
         
    } else {
    	echo "Nothing Selected to Delete";
    }
      
}
  
  
  
   if(!$name && !$sfield && !$sroll)
   {
      echo "Please Enter NAME or FIELD or ROLL NUMBER";
   }

   $db = mysql_connect("localhost");

    mysql_select_db("university",$db);
   if($name)
   {
      echo "<h1>Searched By Name:</h1>";
       $query = "select * from nu where name like '%".$name."%'";
   
      echo "<table width = '100%' border = '0'";
      echo "<tr bgcolor = 'lightblue'><td><P><B>Select</p></B></td>
            <td><p>Roll No</p></td>
            <td><p>Name</p></td>
            <td><p>Father Name</p></td>
            <td><p>phone No</p></td>
            <td><p>Address</p></td>
            <td><p>Field</p></td>";
   
       while($record = mysql_fetch_assoc($result))
          {
          
        //Where it says $record['unique_id'], you need to change that to whatever the unique ID for the table your deleting from is
          
         echo "<tr>
         
         <td width= 84><input name='delete[]' type='checkbox' id='delete' value='{$record['unique_id']}'></td>
                           <td width = 350><p>".$record["rollNo"]."</p></td>
                           <td><p>".$record["name"]."</p></td>
                           <td><p>".$record["fatherName"]."</p></td>
                           <td><p>".$record["phoneNo"]."</p></td>
                           <td><p>".$record["address"]."</p></td>
                           <td><p>".$record["field"]."</p></td>";
          }
   }
   if($sfield)
   {
      echo "<h1>Searched By Field:</h1>";
       $query = "select * from nu where field like '%".$sfield."%'";
       $result = mysql_query($query);
   
      echo "<table width = '100%' border = '0'";
      echo "<tr bgcolor = 'lightblue'><td><P><B>Select</p></B></td>
            <td><p>Roll No</p></td>
            <td><p>Name</p></td>
            <td><p>Father Name</p></td>
            <td><p>phone No</p></td>
            <td><p>Address</p></td>
            <td><p>Field</p></td>";
   
       while($record = mysql_fetch_assoc($result))
          {
         echo "<tr>
            <td width= 84><input name='checkbox' type='checkbox' id='checkbox'></td>
                           <td width = 350><p>".$record["rollNo"]."</p></td>
                           <td><p>".$record["name"]."</p></td>
                           <td><p>".$record["fatherName"]."</p></td>
                           <td><p>".$record["phoneNo"]."</p></td>
                           <td><p>".$record["address"]."</p></td>
                           <td><p>".$record["field"]."</p></td>";
          }
   }
   if($sroll)
   {
      echo "<h1>Searched By Roll Number:</h1>";
       $query = "select * from nu where rollNo like ".$sroll."";
       $result = mysql_query($query);
   
      echo "<table width = '100%' border = '0'";

      echo "<tr bgcolor = 'lightblue'><td><P><B>Select</p></B></td>
            <td><p>Roll No</p></td>
            <td><p>Name</p></td>
            <td><p>Father Name</p></td>
            <td><p>phone No</p></td>
            <td><p>Address</p></td>
            <td><p>Field</p></td>";
   
       while($record = mysql_fetch_assoc($result))
          {
         echo "<tr>
         <td width= 84><input name='delete' type='checkbox' id='delete' value='yes'></td>
                           <td><p>".$record["rollNo"]."</p></td>
                           <td><p>".$record["name"]."</p></td>
                           <td><p>".$record["fatherName"]."</p></td>
                           <td><p>".$record["phoneNo"]."</p></td>
                           <td><p>".$record["address"]."</p></td>
                           <td><p>".$record["field"]."</p></td>";
          }
   }
?>
  <BR>
  <BR>
  <a href = "search.html">If you want to search more then Please Click HERE[/url]
  <BR>
  <BR>
  <a href = "adddata_nu.html">If you want to add more then Please Click HERE[/url]</p>



  <label for="Submit"></label>
  <input type="submit" name="Submit" id="Submit" value="Delete">
</form>
<p><BR>
  <BR>
</p>
</body>
</html>

I only did it for the if($name) statement, so make sure your testing it with that one. If that works, try to do the others yourself by looking at what I did.

doforumda · August 16, 2008

Thank you pocobueno1388 it works thanks alot

Gighalen · August 16, 2008

Just to throw my little 2 cents in, you can add this line on code in your opening FORM tag to confirm the deletion of said rows. That is, given you have a seperate FORM for each. Anyways, this will prompt you to confirm the delete to prevent you from accidently deleting something.

onclick="if (confirm('Are you sure?')) {return true;} else {return false;}"

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problem with delete query

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