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<?php
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/**
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* @file
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* Defines the base query class, which is the underlying layer in a View.
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*/
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/**
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* @defgroup views_query_plugins Views query plugins
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* @{
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* A Views query plugin builds SQL to execute using the Drupal database API.
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*
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* @see hook_views_plugins()
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*/
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/**
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* Object used to create a SELECT query.
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*/
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class views_plugin_query extends views_plugin {
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/**
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* A pager plugin that should be provided by the display.
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*
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* @var views_plugin_pager
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*/
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var $pager = NULL;
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/**
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* Constructor; Create the basic query object and fill with default values.
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*/
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function init($base_table, $base_field, $options) {
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$this->base_table = $base_table;
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$this->base_field = $base_field;
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$this->unpack_options($this->options, $options);
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}
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/**
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* Generate a query and a countquery from all of the information supplied
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* to the object.
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*
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* @param $get_count
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* Provide a countquery if this is true, otherwise provide a normal query.
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*
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* @return SelectQuery
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* A SelectQuery object.
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*/
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function query($get_count = FALSE) { }
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/**
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* Let modules modify the query just prior to finalizing it.
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*
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* @param view $view
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* The view which is executed.
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*/
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function alter(&$view) { }
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/**
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* Builds the necessary info to execute the query.
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*
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* @param view $view
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* The view which is executed.
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*/
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function build(&$view) { }
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/**
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* Executes the query and fills the associated view object with according
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* values.
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*
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* Values to set: $view->result, $view->total_rows, $view->execute_time,
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* $view->pager['current_page'].
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*
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* $view->result should contain an array of objects. The array must use a
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* numeric index starting at 0.
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*
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* @param view $view
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* The view which is executed.
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*/
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function execute(&$view) { }
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/**
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* Add a signature to the query, if such a thing is feasible.
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*
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* This signature is something that can be used when perusing query logs to
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* discern where particular queries might be coming from.
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*
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* @param view $view
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* The view which is executed.
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*/
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function add_signature(&$view) { }
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/**
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* Get aggregation info for group by queries.
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*
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* If NULL, aggregation is not allowed.
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*/
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function get_aggregation_info() { }
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/**
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* Add settings for the ui.
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*/
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function options_form(&$form, &$form_state) {
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parent::options_form($form, $form_state);
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}
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function options_validate(&$form, &$form_state) { }
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function options_submit(&$form, &$form_state) { }
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function summary_title() {
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return t('Settings');
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}
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/**
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* Set a LIMIT on the query, specifying a maximum number of results.
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*/
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function set_limit($limit) {
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$this->limit = $limit;
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}
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/**
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* Set an OFFSET on the query, specifying a number of results to skip
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*/
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function set_offset($offset) {
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$this->offset = $offset;
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}
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/**
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* Render the pager, if necessary.
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*/
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function render_pager($exposed_input) {
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if (!empty($this->pager) && $this->pager->use_pager()) {
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return $this->pager->render($exposed_input);
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}
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return '';
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}
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/**
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* Create a new grouping for the WHERE or HAVING clause.
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*
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* @param $type
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* Either 'AND' or 'OR'. All items within this group will be added
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* to the WHERE clause with this logical operator.
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* @param $group
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* An ID to use for this group. If unspecified, an ID will be generated.
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* @param $where
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* 'where' or 'having'.
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*
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* @return $group
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* The group ID generated.
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*/
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function set_where_group($type = 'AND', $group = NULL, $where = 'where') {
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// Set an alias.
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$groups = &$this->$where;
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if (!isset($group)) {
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$group = empty($groups) ? 1 : max(array_keys($groups)) + 1;
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}
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// Create an empty group
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if (empty($groups[$group])) {
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$groups[$group] = array('conditions' => array(), 'args' => array());
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}
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$groups[$group]['type'] = strtoupper($type);
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return $group;
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}
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/**
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* Control how all WHERE and HAVING groups are put together.
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*
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* @param $type
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* Either 'AND' or 'OR'
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*/
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function set_group_operator($type = 'AND') {
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$this->group_operator = strtoupper($type);
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}
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/**
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* Returns the according entity objects for the given query results.
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*/
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function get_result_entities($results, $relationship = NULL) {
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return FALSE;
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}
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}
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/**
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* @}
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*/
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