--- /dev/null
+<?php
+
+namespace Drupal\Core\Entity\Query\Sql;
+
+use Drupal\Core\Database\Connection;
+use Drupal\Core\Database\Query\SelectInterface;
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Entity\Query\QueryBase;
+use Drupal\Core\Entity\Query\QueryException;
+use Drupal\Core\Entity\Query\QueryInterface;
+
+/**
+ * The SQL storage entity query class.
+ */
+class Query extends QueryBase implements QueryInterface {
+
+ /**
+ * The build sql select query.
+ *
+ * @var \Drupal\Core\Database\Query\SelectInterface
+ */
+ protected $sqlQuery;
+
+ /**
+ * An array of fields keyed by the field alias.
+ *
+ * Each entry correlates to the arguments of
+ * \Drupal\Core\Database\Query\SelectInterface::addField(), so the first one
+ * is the table alias, the second one the field and the last one optional the
+ * field alias.
+ *
+ * @var array
+ */
+ protected $sqlFields = [];
+
+ /**
+ * An array of strings added as to the group by, keyed by the string to avoid
+ * duplicates.
+ *
+ * @var array
+ */
+ protected $sqlGroupBy = [];
+
+ /**
+ * @var \Drupal\Core\Database\Connection
+ */
+ protected $connection;
+
+ /**
+ * Constructs a query object.
+ *
+ * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+ * The entity type definition.
+ * @param string $conjunction
+ * - AND: all of the conditions on the query need to match.
+ * - OR: at least one of the conditions on the query need to match.
+ * @param \Drupal\Core\Database\Connection $connection
+ * The database connection to run the query against.
+ * @param array $namespaces
+ * List of potential namespaces of the classes belonging to this query.
+ */
+ public function __construct(EntityTypeInterface $entity_type, $conjunction, Connection $connection, array $namespaces) {
+ parent::__construct($entity_type, $conjunction, $namespaces);
+ $this->connection = $connection;
+ }
+
+
+ /**
+ * {@inheritdoc}
+ */
+ public function execute() {
+ return $this
+ ->prepare()
+ ->compile()
+ ->addSort()
+ ->finish()
+ ->result();
+ }
+
+ /**
+ * Prepares the basic query with proper metadata/tags and base fields.
+ *
+ * @return \Drupal\Core\Entity\Query\Sql\Query
+ * Returns the called object.
+ *
+ * @throws \Drupal\Core\Entity\Query\QueryException
+ * Thrown if the base table does not exist.
+ */
+ protected function prepare() {
+ if ($this->allRevisions) {
+ if (!$base_table = $this->entityType->getRevisionTable()) {
+ throw new QueryException("No revision table for " . $this->entityTypeId . ", invalid query.");
+ }
+ }
+ else {
+ if (!$base_table = $this->entityType->getBaseTable()) {
+ throw new QueryException("No base table for " . $this->entityTypeId . ", invalid query.");
+ }
+ }
+ $simple_query = TRUE;
+ if ($this->entityType->getDataTable()) {
+ $simple_query = FALSE;
+ }
+ $this->sqlQuery = $this->connection->select($base_table, 'base_table', ['conjunction' => $this->conjunction]);
+ $this->sqlQuery->addMetaData('entity_type', $this->entityTypeId);
+ $id_field = $this->entityType->getKey('id');
+ // Add the key field for fetchAllKeyed().
+ if (!$revision_field = $this->entityType->getKey('revision')) {
+ // When there is no revision support, the key field is the entity key.
+ $this->sqlFields["base_table.$id_field"] = ['base_table', $id_field];
+ // Now add the value column for fetchAllKeyed(). This is always the
+ // entity id.
+ $this->sqlFields["base_table.$id_field" . '_1'] = ['base_table', $id_field];
+ }
+ else {
+ // When there is revision support, the key field is the revision key.
+ $this->sqlFields["base_table.$revision_field"] = ['base_table', $revision_field];
+ // Now add the value column for fetchAllKeyed(). This is always the
+ // entity id.
+ $this->sqlFields["base_table.$id_field"] = ['base_table', $id_field];
+ }
+ if ($this->accessCheck) {
+ $this->sqlQuery->addTag($this->entityTypeId . '_access');
+ }
+ $this->sqlQuery->addTag('entity_query');
+ $this->sqlQuery->addTag('entity_query_' . $this->entityTypeId);
+
+ // Add further tags added.
+ if (isset($this->alterTags)) {
+ foreach ($this->alterTags as $tag => $value) {
+ $this->sqlQuery->addTag($tag);
+ }
+ }
+
+ // Add further metadata added.
+ if (isset($this->alterMetaData)) {
+ foreach ($this->alterMetaData as $key => $value) {
+ $this->sqlQuery->addMetaData($key, $value);
+ }
+ }
+ // This now contains first the table containing entity properties and
+ // last the entity base table. They might be the same.
+ $this->sqlQuery->addMetaData('all_revisions', $this->allRevisions);
+ $this->sqlQuery->addMetaData('simple_query', $simple_query);
+ return $this;
+ }
+
+ /**
+ * Compiles the conditions.
+ *
+ * @return \Drupal\Core\Entity\Query\Sql\Query
+ * Returns the called object.
+ */
+ protected function compile() {
+ $this->condition->compile($this->sqlQuery);
+ return $this;
+ }
+
+ /**
+ * Adds the sort to the build query.
+ *
+ * @return \Drupal\Core\Entity\Query\Sql\Query
+ * Returns the called object.
+ */
+ protected function addSort() {
+ if ($this->count) {
+ $this->sort = [];
+ }
+ // Gather the SQL field aliases first to make sure every field table
+ // necessary is added. This might change whether the query is simple or
+ // not. See below for more on simple queries.
+ $sort = [];
+ if ($this->sort) {
+ foreach ($this->sort as $key => $data) {
+ $sort[$key] = $this->getSqlField($data['field'], $data['langcode']);
+ }
+ }
+ $simple_query = $this->isSimpleQuery();
+ // If the query is set up for paging either via pager or by range or a
+ // count is requested, then the correct amount of rows returned is
+ // important. If the entity has a data table or multiple value fields are
+ // involved then each revision might appear in several rows and this needs
+ // a significantly more complex query.
+ if (!$simple_query) {
+ // First, GROUP BY revision id (if it has been added) and entity id.
+ // Now each group contains a single revision of an entity.
+ foreach ($this->sqlFields as $field) {
+ $group_by = "$field[0].$field[1]";
+ $this->sqlGroupBy[$group_by] = $group_by;
+ }
+ }
+ // Now we know whether this is a simple query or not, actually do the
+ // sorting.
+ foreach ($sort as $key => $sql_alias) {
+ $direction = $this->sort[$key]['direction'];
+ if ($simple_query || isset($this->sqlGroupBy[$sql_alias])) {
+ // Simple queries, and the grouped columns of complicated queries
+ // can be ordered normally, without the aggregation function.
+ $this->sqlQuery->orderBy($sql_alias, $direction);
+ if (!isset($this->sqlFields[$sql_alias])) {
+ $this->sqlFields[$sql_alias] = explode('.', $sql_alias);
+ }
+ }
+ else {
+ // Order based on the smallest element of each group if the
+ // direction is ascending, or on the largest element of each group
+ // if the direction is descending.
+ $function = $direction == 'ASC' ? 'min' : 'max';
+ $expression = "$function($sql_alias)";
+ $expression_alias = $this->sqlQuery->addExpression($expression);
+ $this->sqlQuery->orderBy($expression_alias, $direction);
+ }
+ }
+ return $this;
+ }
+
+ /**
+ * Finish the query by adding fields, GROUP BY and range.
+ *
+ * @return \Drupal\Core\Entity\Query\Sql\Query
+ * Returns the called object.
+ */
+ protected function finish() {
+ $this->initializePager();
+ if ($this->range) {
+ $this->sqlQuery->range($this->range['start'], $this->range['length']);
+ }
+ foreach ($this->sqlGroupBy as $field) {
+ $this->sqlQuery->groupBy($field);
+ }
+ foreach ($this->sqlFields as $field) {
+ $this->sqlQuery->addField($field[0], $field[1], isset($field[2]) ? $field[2] : NULL);
+ }
+ return $this;
+ }
+
+ /**
+ * Executes the query and returns the result.
+ *
+ * @return int|array
+ * Returns the query result as entity IDs.
+ */
+ protected function result() {
+ if ($this->count) {
+ return $this->sqlQuery->countQuery()->execute()->fetchField();
+ }
+ // Return a keyed array of results. The key is either the revision_id or
+ // the entity_id depending on whether the entity type supports revisions.
+ // The value is always the entity id.
+ return $this->sqlQuery->execute()->fetchAllKeyed();
+ }
+
+ /**
+ * Constructs a select expression for a given field and language.
+ *
+ * @param string $field
+ * The name of the field being queried.
+ * @param string $langcode
+ * The language code of the field.
+ *
+ * @return string
+ * An expression that will select the given field for the given language in
+ * a SELECT query, such as 'base_table.id'.
+ */
+ protected function getSqlField($field, $langcode) {
+ if (!isset($this->tables)) {
+ $this->tables = $this->getTables($this->sqlQuery);
+ }
+ $base_property = "base_table.$field";
+ if (isset($this->sqlFields[$base_property])) {
+ return $base_property;
+ }
+ else {
+ return $this->tables->addField($field, 'LEFT', $langcode);
+ }
+ }
+
+ /**
+ * Determines whether the query requires GROUP BY and ORDER BY MIN/MAX.
+ *
+ * @return bool
+ */
+ protected function isSimpleQuery() {
+ return (!$this->pager && !$this->range && !$this->count) || $this->sqlQuery->getMetaData('simple_query');
+ }
+
+ /**
+ * Implements the magic __clone method.
+ *
+ * Reset fields and GROUP BY when cloning.
+ */
+ public function __clone() {
+ parent::__clone();
+ $this->sqlFields = [];
+ $this->sqlGroupBy = [];
+ }
+
+ /**
+ * Gets the Tables object for this query.
+ *
+ * @param \Drupal\Core\Database\Query\SelectInterface $sql_query
+ * The SQL query object being built.
+ *
+ * @return \Drupal\Core\Entity\Query\Sql\TablesInterface
+ * The object that adds tables and fields to the SQL query object.
+ */
+ public function getTables(SelectInterface $sql_query) {
+ $class = static::getClass($this->namespaces, 'Tables');
+ return new $class($sql_query);
+ }
+
+}
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