CODEWITHSUNDEEP
databasecodeigniterjoin
user1052462
user1052462

Reputation: 156

Join two tables in codeigniter

I'am trying to join two tables. Lets say t1 and t2. t1 has fk t2_id. but when I run the code nothing is shown in my view.

Controller:

 //..
 $data['city']= $this->state_model->name();
 $this->load->view('viewt', $data);

Model:

    function name(){
    $this->db->select('*');
    $this->db->from('state');
    $this->db->join('city', 'city.state_id = state.id');
    $sql = $this->db->get();

    if ($sql->num_rows () >0) {
        foreach($sql->result() as $row) {
        $this->db->where('state_id','state.id');
        $r = $this->db->get('city');
        }

    return $r->result();

     }
     else {
     return null;   
            }

View:

 <?php foreach($city as $row):?>
  <?php echo $row->cityname; ?></br></br></br>
  <?php endforeach;?></br></br>

Thanks in advance

The Queries:

  SELECT `id`, `statename`
  FROM (`state`)
  ORDER BY `id` ASC

  SELECT *
FROM (`state`)
JOIN `city` ON `city`.`state_id` = `state`.`id`  

  SELECT *
  FROM (`city`)
  WHERE `state_id` = 'state.id'  

  SELECT *
  FROM (`city`)
  WHERE `state_id` = 'state.id'  

  SELECT *
  FROM (`city`)
  WHERE `state_id` = 'state.id'

Upvotes: 0

Views: 2591

Answers (4)

swatkins
swatkins

Reputation: 13630

OK, so you're getting three records back from your join - so we know that's working. But you're other 3 queries look incorrect. Try this:

if ($sql->num_rows () >0) {
    $r = array();
    foreach($sql->result() as $row) {

        // here, you need to replace 'state.id' with the actual
        // results from your join query ($row->id which is the id
        // from the state table
        $this->db->where('state_id',$row->id);
        $r[] = $this->db->get('city')->result();
    }
    return $r;
 }
 else 
 {
     return null;   
 }

So now you should have an array of results and can iterate with the foreach in your view.

Upvotes: 0

Mudshark
Mudshark

Reputation: 3253

I don't quite understand why you need a second query inside a loop. Can't you just do:

if ($sql->num_rows() > 0) {
    return $sql->result();
}

?

Upvotes: 0

Shomz
Shomz

Reputation: 37701

Your $r variable will only have the last iteration thus the function will only return the last result set, so try this: 

if ($sql->num_rows () >0) {
    foreach($sql->result() as $row) {
    $this->db->where('state_id',$row->state_id);
    $r[] = $this->db->get('city')->row();
    }

return $r;

Upvotes: 1

uzsolt
uzsolt

Reputation: 6027

Check the latest query: $this->db->last_query().

Upvotes: 0

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