codeigniter view, add, update and delete

Question

I\'m newbie in codeigniter and still learning. Anyone can help for sample in basic view, add, update, delete operation and queries in codeigniter will gladly appreciated.

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Answer 1

You can use this as an example

class Crud extends Model {
    // selecting records by specifying the column field
    function select()
    {
        // use $this->db->select('*') if you want to select all the records
        $this->db->select('title, content, date');
        // use $this->db->where('id', 1) if you want to specify what row to be fetched
        $q = $this->db->get('mytable');

        // to get the result
        $data = array();
        // for me its better to check if there are records that are fetched
        if($q->num_rows() > 0) { 
            // by doing this it means you are returning array of records
            foreach($q->result_array() as $row) {
                $data[] = $row;
            }
            // if your expecting only one record will be fetched from the table
            // use $row = $q->row();
            // then return $row;
        }
        return $data;
    }

    // to add record
    function add()
    {
        $data = array(
           'title' => 'My title' ,
           'name' => 'My Name' ,
           'date' => 'My date'
        );

        $this->db->insert('mytable', $data); 
    }

    // to update record
    function update()
    {
        $data = array(
           'title' => $title,
           'name' => $name,
           'date' => $date
        );

        $this->db->where('id', 1);
        $this->db->update('mytable', $data); 
    }

    // to delete a record
    function delete()
    {
        $this->db->where('id', 1);
        $this->db->delete('mytable');
    }
}

Some of this are from codeigniter userguide.

To view the records,

If return data is array of records,

   foreach($data as $row)
   {
       echo $row['title'] . "<br />";
   }

If the return data is an object (by using $q->row),

   echo $data->title;

This is just a few examples or CRUD in Codeigniter. Visit the codeigniter userguide.

Answer 2

Some sample queries in Codeigniter

class Names extends Model {
  function addRecord($yourname) {
    $this->db->set("name", $yourname);
    $this->db->insert("names");
    return $this->db->_error_number(); // return the error occurred in last query
  }
  function updateRecord($yourname) {
    $this->db->set("name", $yourname);
    $this->db->update("names");
  }
  function deleteRecord($yourname) {
    $this->db->where("name", $yourname);
    $this->db->delete("names");
  }
  function selectRecord($yourname) {
    $this->db->select("name, name_id");
    $this->db->from("names");
    $this->db->where("name", $yourname);
    $query = $this->db->get();
    return $this->db->result();
  }
  function selectAll() {
     $this->db->select("name");
     $this->db->from("names");
     return $this->db->get();
  }
}

More information and more ways for CRUD in codeigniter active record documentation More about error number over here

A sample controller

class names_controller extends Controller {
   function addPerson() {
      $this->load->Model("Names");
      $name = $this->input->post("name"); // get the data from a form submit
      $name = $this->xss->clean();
      $error = $this->Names->addRecord($name);
      if(!$error) {
         $results = $this->Names->selectAll();
         $data['names'] = $results->result();
         $this->load->view("show_names", $data);
      } else {
         $this->load->view("error");
      }
   }
}

More about controllers over here

A sample view - show_names.php

<table>
  <tr>
    <td>Name</td>
  </tr>
  <?php foreach($names as $row): ?>
  <tr><td><?ph echo $row->name; ?></td></tr>
  <?php endforeach; ?>
</table>

More about codeigniter views over here