1: <?php
  2: class Settings_Model extends CI_Model {
  3:     /**
  4:      * Class Constructor
  5:      */
  6:     function __construct() {
  7:         parent::__construct();
  8:     }
  9:     
 10:     /**
 11:      * Get setting value from database.
 12:      * 
 13:      * This method returns a system setting from the 
 14:      * database.
 15:      * 
 16:      * @expectedException InvalidArgumentException Raises whenever the 
 17:      * $name argument is not a string, or does not exist in the database.
 18:      * 
 19:      * @param string $name The database setting name.
 20:      * @return string Returns the database value for 
 21:      * the selected setting.
 22:      */
 23:     function get_setting($name) {
 24:         if (!is_string($name)) { // Check argument type.
 25:             throw new InvalidArgumentException('$name argument is not a string : ' . $name);
 26:         }
 27:         
 28:         if ($this->db->get_where('ea_settings', array('name' => $name))->num_rows() == 0) { // Check if setting exists in db.
 29:             throw new InvalidArgumentException('$name setting does not exist in database : ' . $name);
 30:         }
 31:         
 32:         $query = $this->db->get_where('ea_settings', array('name' => $name));
 33:         $setting = ($query->num_rows() > 0) ? $query->row() : '';
 34:         return $setting->value;
 35:     }
 36:     
 37:     /**
 38:      * This method sets the value for a specific setting 
 39:      * on the database. If the setting doesn't exist, it
 40:      * is going to be created, otherwise updated.
 41:      * 
 42:      * @expectedException DatabaseException Raises whenever an error 
 43:      * occures during the insert or the update operation.
 44:      * @expectedException InvalidArgumentException Raises whenever 
 45:      * the $name argument is not a string.
 46:      * 
 47:      * @param string $name The setting name.
 48:      * @param type $value The setting value.
 49:      * @return int Returns the setting database id.
 50:      */
 51:     function set_setting($name, $value) {
 52:         if (!is_string($name)) {
 53:             throw new InvalidArgumentException('$name argument is not a string : ' . $name);
 54:         }            
 55:         
 56:         $query = $this->db->get_where('ea_settings', array('name' => $name));
 57:         if ($query->num_rows() > 0) {
 58:             // Update setting
 59:             if (!$this->db->update('ea_settings', array('value' => $value), array('name' => $name))) {
 60:                 throw new DatabaseException('Could not update database setting.');
 61:             }
 62:             $setting_id = intval($this->db->get_where('ea_settings', array('name' => $name))->row()->id);
 63:         } else {
 64:             // Insert setting
 65:             $insert_data = array(
 66:                 'name'  => $name,
 67:                 'value' => $value
 68:             );
 69:             if (!$this->db->insert('ea_settings', $insert_data)) {
 70:                 throw new DatabaseException('Could not insert database setting');
 71:             }
 72:             $setting_id = intval($this->db->insert_id());
 73:         }
 74:         
 75:         return $setting_id;
 76:     }
 77:     
 78:     /**
 79:      * Remove a setting from the database.
 80:      * 
 81:      * @expectedException InvalidArgumentException Raises whenever 
 82:      * the $name parameter is not a string.
 83:      * 
 84:      * @param string $name The setting name to be removed.
 85:      * @return bool Returns the delete operation result.
 86:      */
 87:     function remove_setting($name) {
 88:         if (!is_string($name)) {
 89:             throw new InvalidArgumentException('$name is not a string : ' . $name);
 90:         }
 91:         
 92:         if ($this->db->get_where('ea_settings', array('name' => $name))->num_rows() == 0) {
 93:             return FALSE; // There is no such setting.
 94:         }
 95:         
 96:         return $this->db->delete('ea_settings', array('name' => $name));
 97:     }
 98: }
 99: 
100: /* End of file settings_model.php */
101: /* Location: ./application/models/settings_model.php */