Updating Data in Codeigniter

$this->db->update();

Generates an update string and runs the query based on the data you supply. You can pass an array or an object to the function. Here is an example using an array:

$data = array(
               'title' => $title,
               'name' => $name,
               'date' => $date
            );

$this->db->where('id', $id);
$this->db->update('tablename', $data);

// Produces:
// UPDATE tablename
// SET title = '{$title}', name = '{$name}', date = '{$date}'
// WHERE id = $id

 

Or you can supply an object:

/*
    class Myclass {
        var $title = 'My Title';
        var $content = 'My Content';
        var $date = 'My Date';
    }
*/

$object = new Myclass;

$this->db->where('id', $id);
$this->db->update('tablename', $object);

// Produces:
// UPDATE tablename
// SET title = '{$title}', name = '{$name}', date = '{$date}'
// WHERE id = $id

 

Note: All values are escaped automatically producing safer queries.

You'll notice the use of the $this->db->where() function, enabling you to set the WHERE clause. You can optionally pass this information directly into the update function as a string:

$this->db->update('tablename', $data, "id = 4");

Or as an array:

$this->db->update('tablename', $data, array('id' => $id));

 

You may also use the $this->db->set() function described above when performing updates.

$this->db->update_batch();

Generates an update string based on the data you supply, and runs the query. You can either pass an array or an object to the function. Here is an example using an array:

$data = array(
   array(
      'title' => 'My title' ,
      'name' => 'My Name 2' ,
      'date' => 'My date 2'
   ),
   array(
      'title' => 'Another title' ,
      'name' => 'Another Name 2' ,
      'date' => 'Another date 2'
   )
);

$this->db->update_batch('tablename', $data, 'title');

// Produces:
// UPDATE `tablename` SET `name` = CASE
// WHEN `title` = 'My title' THEN 'My Name 2'
// WHEN `title` = 'Another title' THEN 'Another Name 2'
// ELSE `name` END,
// `date` = CASE
// WHEN `title` = 'My title' THEN 'My date 2'
// WHEN `title` = 'Another title' THEN 'Another date 2'
// ELSE `date` END
// WHERE `title` IN ('My title','Another title')

 

The first parameter will contain the table name, the second is an associative array of values, the third parameter is the where key.