public function Select::preExecute in Drupal 8

Same name and namespace in other branches

1. 9 core/lib/Drupal/Core/Database/Query/Select.php \Drupal\Core\Database\Query\Select::preExecute()

Generic preparation and validation for a SELECT query.

Return value

TRUE if the validation was successful, FALSE if not.

Overrides SelectInterface::preExecute

1 call to Select::preExecute()

Select::execute in core/lib/Drupal/Core/Database/Query/Select.php

Runs the query against the database.

File

core/lib/Drupal/Core/Database/Query/Select.php, line 447

Class

Select

Query builder for SELECT statements.

Namespace

Drupal\Core\Database\Query

Code

public function preExecute(SelectInterface $query = NULL) {

  // If no query object is passed in, use $this.
  if (!isset($query)) {
    $query = $this;
  }

  // Only execute this once.
  if ($query
    ->isPrepared()) {
    return TRUE;
  }

  // Modules may alter all queries or only those having a particular tag.
  if (isset($this->alterTags)) {

    // Many contrib modules as well as Entity Reference in core assume that
    // query tags used for access-checking purposes follow the pattern
    // $entity_type . '_access'. But this is not the case for taxonomy terms,
    // since the core Taxonomy module used to add term_access instead of
    // taxonomy_term_access to its queries. Provide backwards compatibility
    // by adding both tags here instead of attempting to fix all contrib
    // modules in a coordinated effort.
    // TODO:
    // - Extract this mechanism into a hook as part of a public (non-security)
    //   issue.
    // - Emit E_USER_DEPRECATED if term_access is used.
    //   https://www.drupal.org/node/2575081
    $term_access_tags = [
      'term_access' => 1,
      'taxonomy_term_access' => 1,
    ];
    if (array_intersect_key($this->alterTags, $term_access_tags)) {
      $this->alterTags += $term_access_tags;
    }
    $hooks = [
      'query',
    ];
    foreach ($this->alterTags as $tag => $value) {
      $hooks[] = 'query_' . $tag;
    }
    \Drupal::moduleHandler()
      ->alter($hooks, $query);
  }
  $this->prepared = TRUE;

  // Now also prepare any sub-queries.
  foreach ($this->tables as $table) {
    if ($table['table'] instanceof SelectInterface) {
      $table['table']
        ->preExecute();
    }
  }
  foreach ($this->union as $union) {
    $union['query']
      ->preExecute();
  }
  return $this->prepared;
}