Drupal-7.12 Create node type

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function examplenode_install() {
  //Updates the database cache of node types
  node_types_rebuild();

  $types = node_type_get_types();

  // add the body field to the node type
  node_add_body_field($types['job_post']);

  // Load the instance definition for our content type's body
  $body_instance = field_info_instance('node', 'body', 'job_post');

  // Configure the body field
  $body_instance['type'] = 'text_summary_or_trimmed';

  // Save our changes to the body field instance.
  field_update_instance($body_instance);

  // Create all the fields we are adding to our content type.
  foreach (_job_post_installed_fields() as $field) {
    field_create_field($field);
  }

  // Create all the instances for our fields.
  foreach (_job_post_installed_instances() as $instance) {
    $instance['entity_type'] = 'node';
    $instance['bundle'] = 'job_post';
    field_create_instance($instance);
  }
}

/**
* Return a structured array defining the fields created by this content type.
* For the job post module there is only one additional field – the company name
* Other fields could be added by defining them in this function as additional elements
* in the array below
*/
function _job_post_installed_fields() {
  $t = get_t();

  return array(
    'job_post_company' => array(
      'field_name' => 'job_post_company',
      'label' => $t('Company posting the job listing'),
      'type' => 'text',
    ),
  );
}

/**
* Return a structured array defining the field instances associated with this content type.
*/
function _job_post_installed_instances() {
  $t = get_t();

  return array(
    'job_post_company' => array(
      'field_name' => 'job_post_company',
      'type' => 'text',
      'label' => $t('Company posting the job listing'),
      'widget' => array(
        'type' => 'text_textfield',
      ),
      'display' => array(
        'example_node_list' => array(
          'label' => $t('Company posting the job listing'),
          'type' => 'text',
        ),
      ),
    ),
  );
}

/**
* Implements hook_uninstall().
*/
function examplenode_uninstall() {
  // Gather all the example content that might have been created while this
  // module was enabled.
  $sql = 'SELECT nid FROM {node} n WHERE n.type = :type';
  $result = db_query($sql, array(':type' => 'job_post'));
  $nids = array();
  foreach ($result as $row) {
    $nids[] = $row->nid;
  }

  // Delete all the nodes at once
  node_delete_multiple($nids);

  // Loop over each of the fields defined by this module and delete
  // all instances of the field, their data, and the field itself.
  foreach (array_keys(_job_post_installed_fields()) as $field) {
    field_delete_field($field);
  }

  // Loop over any remaining field instances attached to the job_post
  // content type (such as the body field) and delete them individually.
  $instances = field_info_instances('node', 'job_post');
  foreach ($instances as $instance_name => $instance) {
    field_delete_instance($instance);
  }

  // Delete our content type
  node_type_delete('job_post');

  // Purge all field infromation
  field_purge_batch(1000);
}