Unable to get partial data from database using Codeigniter - php

Question

I am very new in codeigniter. This is my first app. In my database I insert empid and deptid. When both are inserted in table all data show. But I want when both data not present in table then also all data show with blank that column. If any data not present in table then a add button display in place of delete url.
controller
public function index()
{
$rows = $this->EmpDept_model->get_empdept();
$data['recdept'] = $this->EmpDept_model->get_empdept();
$this->load->helper('url');
$this->load->view('empdept/EmpDept_list',$data);
}
view
<table class="table table-striped table-bordered" id="dataTables-example">
<thead>
<tr style="background-color: #d7ccc8;">
<th>Employee Name</th>
<th>Department Name</th>
<th>Option</th>
</tr>
</thead>
<tbody>
<?php
foreach($recdept as $r)
{
echo "<tr class='odd gradeX'>";
echo "<td>".$r->empname."</td>";
echo "<td>".$r->deptfname."</td>";
echo " <td> <a data-toggle='tooltip' data-placement='bottom' title='Delete' style='color: #000000;' href = '".base_url()."index.php/empdept/delete/".$r->empdeptid."'>Delete</a></td>";
/*echo "<td><a data-toggle='tooltip' data-placement='bottom' title='Edit' style='color: #000000;' href = '".base_url()."index.php/emp/edit/".$r->empid."'><span class='glyphicon glyphicon-pencil'></span></a>";
echo " || <a data-toggle='tooltip' data-placement='bottom' title='Delete' style='color: #000000;' href = '".base_url()."index.php/emp/delete/".$r->empid."'><span class='fa fa-ban fa-1x'></span></a></td>";*/
echo "</tr>";
}
?>
</tbody>
</table>
model
public function get_empdept()
{
$this->db->select('ed.empdeptid,e.empname,d.deptfname');
$this->db->from('empdept ed,empinfo e,deptinfo d');
$this->db->where('e.empid =ed.empid and d.deptid = ed.deptid');
$query = $this->db->get();
return $query->result();
}

Answer 1

Try this code:
public function get_empdept()
{
$this->db->select('ed.empdeptid,e.empname,d.deptfname');
$this->db->from('empdept ed');
$this->db->join('empinfo e','e.empid = ed.empid', 'left');
$this->db->join('deptinfo d','d.deptid = ed.deptid', 'left');
$query = $this->db->get();
return $query->result();
}
Check if column is blank than set add button otherwise delete button:
<table class="table table-striped table-bordered" id="dataTables-example">
<thead>
<tr style="background-color: #d7ccc8;">
<th>Employee Name</th>
<th>Department Name</th>
<th>Option</th>
</tr>
</thead>
<tbody>
<?php
foreach($recdept as $r)
{
echo "<tr class='odd gradeX'>";
echo "<td>".$r->empname."</td>";
echo "<td>".$r->deptfname."</td>";
if(!empty($r->empdeptid)){
echo " <td> <a data-toggle='tooltip' data-placement='bottom' title='Delete' style='color: #000000;' href = '".base_url()."index.php/empdept/delete/".$r->empdeptid."'>Delete</a></td>";
} else {
echo " <td> <a data-toggle='tooltip' data-placement='bottom' title='Add New' style='color: #000000;' href = '".base_url()."index.php/empdept/add/'>Add</a></td>";
}
echo "</tr>";
}
?>
</tbody>
</table>

Answer 2

You have to use union to achieve this. But code-igniter doesn't support union
So you can try like following . Change the query in model
$this->db->query("Select empdeptid from empdept union Select empname from empinfo union Select deptfname from deptinfo where empinfo.empid = empdept.empid and deptinfo.deptid = empdept.deptid");