--- /dev/null
+<?php
+
+namespace Drupal\Core\Database\Query;
+
+use Drupal\Core\Database\Database;
+use Drupal\Core\Database\Connection;
+
+/**
+ * Query builder for SELECT statements.
+ *
+ * @ingroup database
+ */
+class Select extends Query implements SelectInterface {
+
+ use QueryConditionTrait;
+
+ /**
+ * The fields to SELECT.
+ *
+ * @var array
+ */
+ protected $fields = [];
+
+ /**
+ * The expressions to SELECT as virtual fields.
+ *
+ * @var array
+ */
+ protected $expressions = [];
+
+ /**
+ * The tables against which to JOIN.
+ *
+ * This property is a nested array. Each entry is an array representing
+ * a single table against which to join. The structure of each entry is:
+ *
+ * array(
+ * 'type' => $join_type (one of INNER, LEFT OUTER, RIGHT OUTER),
+ * 'table' => $table,
+ * 'alias' => $alias_of_the_table,
+ * 'condition' => $join_condition (string or Condition object),
+ * 'arguments' => $array_of_arguments_for_placeholders_in_the condition.
+ * 'all_fields' => TRUE to SELECT $alias.*, FALSE or NULL otherwise.
+ * )
+ *
+ * If $table is a string, it is taken as the name of a table. If it is
+ * a Select query object, it is taken as a subquery.
+ *
+ * If $join_condition is a Condition object, any arguments should be
+ * incorporated into the object; a separate array of arguments does not
+ * need to be provided.
+ *
+ * @var array
+ */
+ protected $tables = [];
+
+ /**
+ * The fields by which to order this query.
+ *
+ * This is an associative array. The keys are the fields to order, and the value
+ * is the direction to order, either ASC or DESC.
+ *
+ * @var array
+ */
+ protected $order = [];
+
+ /**
+ * The fields by which to group.
+ *
+ * @var array
+ */
+ protected $group = [];
+
+ /**
+ * The conditional object for the HAVING clause.
+ *
+ * @var \Drupal\Core\Database\Query\Condition
+ */
+ protected $having;
+
+ /**
+ * Whether or not this query should be DISTINCT
+ *
+ * @var bool
+ */
+ protected $distinct = FALSE;
+
+ /**
+ * The range limiters for this query.
+ *
+ * @var array
+ */
+ protected $range;
+
+ /**
+ * An array whose elements specify a query to UNION, and the UNION type. The
+ * 'type' key may be '', 'ALL', or 'DISTINCT' to represent a 'UNION',
+ * 'UNION ALL', or 'UNION DISTINCT' statement, respectively.
+ *
+ * All entries in this array will be applied from front to back, with the
+ * first query to union on the right of the original query, the second union
+ * to the right of the first, etc.
+ *
+ * @var array
+ */
+ protected $union = [];
+
+ /**
+ * Indicates if preExecute() has already been called.
+ * @var bool
+ */
+ protected $prepared = FALSE;
+
+ /**
+ * The FOR UPDATE status
+ */
+ protected $forUpdate = FALSE;
+
+ /**
+ * Constructs a Select object.
+ *
+ * @param string $table
+ * The name of the table that is being queried.
+ * @param string $alias
+ * The alias for the table.
+ * @param \Drupal\Core\Database\Connection $connection
+ * Database connection object.
+ * @param array $options
+ * Array of query options.
+ */
+ public function __construct($table, $alias = NULL, Connection $connection, $options = []) {
+ $options['return'] = Database::RETURN_STATEMENT;
+ parent::__construct($connection, $options);
+ $conjunction = isset($options['conjunction']) ? $options['conjunction'] : 'AND';
+ $this->condition = new Condition($conjunction);
+ $this->having = new Condition($conjunction);
+ $this->addJoin(NULL, $table, $alias);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function addTag($tag) {
+ $this->alterTags[$tag] = 1;
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function hasTag($tag) {
+ return isset($this->alterTags[$tag]);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function hasAllTags() {
+ return !(boolean)array_diff(func_get_args(), array_keys($this->alterTags));
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function hasAnyTag() {
+ return (boolean)array_intersect(func_get_args(), array_keys($this->alterTags));
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function addMetaData($key, $object) {
+ $this->alterMetaData[$key] = $object;
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getMetaData($key) {
+ return isset($this->alterMetaData[$key]) ? $this->alterMetaData[$key] : NULL;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function arguments() {
+ if (!$this->compiled()) {
+ return NULL;
+ }
+
+ $args = $this->condition->arguments() + $this->having->arguments();
+
+ foreach ($this->tables as $table) {
+ if ($table['arguments']) {
+ $args += $table['arguments'];
+ }
+ // If this table is a subquery, grab its arguments recursively.
+ if ($table['table'] instanceof SelectInterface) {
+ $args += $table['table']->arguments();
+ }
+ // If the join condition is an object, grab its arguments recursively.
+ if (!empty($table['condition']) && $table['condition'] instanceof ConditionInterface) {
+ $args += $table['condition']->arguments();
+ }
+ }
+
+ foreach ($this->expressions as $expression) {
+ if ($expression['arguments']) {
+ $args += $expression['arguments'];
+ }
+ }
+
+ // If there are any dependent queries to UNION,
+ // incorporate their arguments recursively.
+ foreach ($this->union as $union) {
+ $args += $union['query']->arguments();
+ }
+
+ return $args;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function compile(Connection $connection, PlaceholderInterface $queryPlaceholder) {
+ $this->condition->compile($connection, $queryPlaceholder);
+ $this->having->compile($connection, $queryPlaceholder);
+
+ foreach ($this->tables as $table) {
+ // If this table is a subquery, compile it recursively.
+ if ($table['table'] instanceof SelectInterface) {
+ $table['table']->compile($connection, $queryPlaceholder);
+ }
+ // Make sure join conditions are also compiled.
+ if (!empty($table['condition']) && $table['condition'] instanceof ConditionInterface) {
+ $table['condition']->compile($connection, $queryPlaceholder);
+ }
+ }
+
+ // If there are any dependent queries to UNION, compile it recursively.
+ foreach ($this->union as $union) {
+ $union['query']->compile($connection, $queryPlaceholder);
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function compiled() {
+ if (!$this->condition->compiled() || !$this->having->compiled()) {
+ return FALSE;
+ }
+
+ foreach ($this->tables as $table) {
+ // If this table is a subquery, check its status recursively.
+ if ($table['table'] instanceof SelectInterface) {
+ if (!$table['table']->compiled()) {
+ return FALSE;
+ }
+ }
+ if (!empty($table['condition']) && $table['condition'] instanceof ConditionInterface) {
+ if (!$table['condition']->compiled()) {
+ return FALSE;
+ }
+ }
+ }
+
+ foreach ($this->union as $union) {
+ if (!$union['query']->compiled()) {
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function havingCondition($field, $value = NULL, $operator = NULL) {
+ $this->having->condition($field, $value, $operator);
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function &havingConditions() {
+ return $this->having->conditions();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function havingArguments() {
+ return $this->having->arguments();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function having($snippet, $args = []) {
+ $this->having->where($snippet, $args);
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function havingCompile(Connection $connection) {
+ $this->having->compile($connection, $this);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function extend($extender_name) {
+ $override_class = $extender_name . '_' . $this->connection->driver();
+ if (class_exists($override_class)) {
+ $extender_name = $override_class;
+ }
+ return new $extender_name($this, $this->connection);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function havingIsNull($field) {
+ $this->having->isNull($field);
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function havingIsNotNull($field) {
+ $this->having->isNotNull($field);
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function havingExists(SelectInterface $select) {
+ $this->having->exists($select);
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function havingNotExists(SelectInterface $select) {
+ $this->having->notExists($select);
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function forUpdate($set = TRUE) {
+ if (isset($set)) {
+ $this->forUpdate = $set;
+ }
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function &getFields() {
+ return $this->fields;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function &getExpressions() {
+ return $this->expressions;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function &getOrderBy() {
+ return $this->order;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function &getGroupBy() {
+ return $this->group;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function &getTables() {
+ return $this->tables;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function &getUnion() {
+ return $this->union;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function escapeLike($string) {
+ return $this->connection->escapeLike($string);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function escapeField($string) {
+ return $this->connection->escapeField($string);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getArguments(PlaceholderInterface $queryPlaceholder = NULL) {
+ if (!isset($queryPlaceholder)) {
+ $queryPlaceholder = $this;
+ }
+ $this->compile($this->connection, $queryPlaceholder);
+ return $this->arguments();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function isPrepared() {
+ return $this->prepared;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ 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 $this->prepared;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function execute() {
+ // If validation fails, simply return NULL.
+ // Note that validation routines in preExecute() may throw exceptions instead.
+ if (!$this->preExecute()) {
+ return NULL;
+ }
+
+ $args = $this->getArguments();
+ return $this->connection->query((string) $this, $args, $this->queryOptions);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function distinct($distinct = TRUE) {
+ $this->distinct = $distinct;
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function addField($table_alias, $field, $alias = NULL) {
+ // If no alias is specified, first try the field name itself.
+ if (empty($alias)) {
+ $alias = $field;
+ }
+
+ // If that's already in use, try the table name and field name.
+ if (!empty($this->fields[$alias])) {
+ $alias = $table_alias . '_' . $field;
+ }
+
+ // If that is already used, just add a counter until we find an unused alias.
+ $alias_candidate = $alias;
+ $count = 2;
+ while (!empty($this->fields[$alias_candidate])) {
+ $alias_candidate = $alias . '_' . $count++;
+ }
+ $alias = $alias_candidate;
+
+ $this->fields[$alias] = [
+ 'field' => $field,
+ 'table' => $table_alias,
+ 'alias' => $alias,
+ ];
+
+ return $alias;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function fields($table_alias, array $fields = []) {
+ if ($fields) {
+ foreach ($fields as $field) {
+ // We don't care what alias was assigned.
+ $this->addField($table_alias, $field);
+ }
+ }
+ else {
+ // We want all fields from this table.
+ $this->tables[$table_alias]['all_fields'] = TRUE;
+ }
+
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function addExpression($expression, $alias = NULL, $arguments = []) {
+ if (empty($alias)) {
+ $alias = 'expression';
+ }
+
+ $alias_candidate = $alias;
+ $count = 2;
+ while (!empty($this->expressions[$alias_candidate])) {
+ $alias_candidate = $alias . '_' . $count++;
+ }
+ $alias = $alias_candidate;
+
+ $this->expressions[$alias] = [
+ 'expression' => $expression,
+ 'alias' => $alias,
+ 'arguments' => $arguments,
+ ];
+
+ return $alias;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function join($table, $alias = NULL, $condition = NULL, $arguments = []) {
+ return $this->addJoin('INNER', $table, $alias, $condition, $arguments);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function innerJoin($table, $alias = NULL, $condition = NULL, $arguments = []) {
+ return $this->addJoin('INNER', $table, $alias, $condition, $arguments);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function leftJoin($table, $alias = NULL, $condition = NULL, $arguments = []) {
+ return $this->addJoin('LEFT OUTER', $table, $alias, $condition, $arguments);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function rightJoin($table, $alias = NULL, $condition = NULL, $arguments = []) {
+ return $this->addJoin('RIGHT OUTER', $table, $alias, $condition, $arguments);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function addJoin($type, $table, $alias = NULL, $condition = NULL, $arguments = []) {
+ if (empty($alias)) {
+ if ($table instanceof SelectInterface) {
+ $alias = 'subquery';
+ }
+ else {
+ $alias = $table;
+ }
+ }
+
+ $alias_candidate = $alias;
+ $count = 2;
+ while (!empty($this->tables[$alias_candidate])) {
+ $alias_candidate = $alias . '_' . $count++;
+ }
+ $alias = $alias_candidate;
+
+ if (is_string($condition)) {
+ $condition = str_replace('%alias', $alias, $condition);
+ }
+
+ $this->tables[$alias] = [
+ 'join type' => $type,
+ 'table' => $table,
+ 'alias' => $alias,
+ 'condition' => $condition,
+ 'arguments' => $arguments,
+ ];
+
+ return $alias;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function orderBy($field, $direction = 'ASC') {
+ // Only allow ASC and DESC, default to ASC.
+ $direction = strtoupper($direction) == 'DESC' ? 'DESC' : 'ASC';
+ $this->order[$field] = $direction;
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function orderRandom() {
+ $alias = $this->addExpression('RAND()', 'random_field');
+ $this->orderBy($alias);
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function range($start = NULL, $length = NULL) {
+ $this->range = $start !== NULL ? ['start' => $start, 'length' => $length] : [];
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function union(SelectInterface $query, $type = '') {
+ // Handle UNION aliasing.
+ switch ($type) {
+ // Fold UNION DISTINCT to UNION for better cross database support.
+ case 'DISTINCT':
+ case '':
+ $type = 'UNION';
+ break;
+
+ case 'ALL':
+ $type = 'UNION ALL';
+ default:
+ }
+
+ $this->union[] = [
+ 'type' => $type,
+ 'query' => $query,
+ ];
+
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function groupBy($field) {
+ $this->group[$field] = $field;
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function countQuery() {
+ $count = $this->prepareCountQuery();
+
+ $query = $this->connection->select($count, NULL, $this->queryOptions);
+ $query->addExpression('COUNT(*)');
+
+ return $query;
+ }
+
+ /**
+ * Prepares a count query from the current query object.
+ *
+ * @return \Drupal\Core\Database\Query\Select
+ * A new query object ready to have COUNT(*) performed on it.
+ */
+ protected function prepareCountQuery() {
+ // Create our new query object that we will mutate into a count query.
+ $count = clone($this);
+
+ $group_by = $count->getGroupBy();
+ $having = $count->havingConditions();
+
+ if (!$count->distinct && !isset($having[0])) {
+ // When not executing a distinct query, we can zero-out existing fields
+ // and expressions that are not used by a GROUP BY or HAVING. Fields
+ // listed in a GROUP BY or HAVING clause need to be present in the
+ // query.
+ $fields =& $count->getFields();
+ foreach (array_keys($fields) as $field) {
+ if (empty($group_by[$field])) {
+ unset($fields[$field]);
+ }
+ }
+
+ $expressions =& $count->getExpressions();
+ foreach (array_keys($expressions) as $field) {
+ if (empty($group_by[$field])) {
+ unset($expressions[$field]);
+ }
+ }
+
+ // Also remove 'all_fields' statements, which are expanded into tablename.*
+ // when the query is executed.
+ foreach ($count->tables as &$table) {
+ unset($table['all_fields']);
+ }
+ }
+
+ // If we've just removed all fields from the query, make sure there is at
+ // least one so that the query still runs.
+ $count->addExpression('1');
+
+ // Ordering a count query is a waste of cycles, and breaks on some
+ // databases anyway.
+ $orders = &$count->getOrderBy();
+ $orders = [];
+
+ if ($count->distinct && !empty($group_by)) {
+ // If the query is distinct and contains a GROUP BY, we need to remove the
+ // distinct because SQL99 does not support counting on distinct multiple fields.
+ $count->distinct = FALSE;
+ }
+
+ // If there are any dependent queries to UNION, prepare each of those for
+ // the count query also.
+ foreach ($count->union as &$union) {
+ $union['query'] = $union['query']->prepareCountQuery();
+ }
+
+ return $count;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function __toString() {
+ // For convenience, we compile the query ourselves if the caller forgot
+ // to do it. This allows constructs like "(string) $query" to work. When
+ // the query will be executed, it will be recompiled using the proper
+ // placeholder generator anyway.
+ if (!$this->compiled()) {
+ $this->compile($this->connection, $this);
+ }
+
+ // Create a sanitized comment string to prepend to the query.
+ $comments = $this->connection->makeComment($this->comments);
+
+ // SELECT
+ $query = $comments . 'SELECT ';
+ if ($this->distinct) {
+ $query .= 'DISTINCT ';
+ }
+
+ // FIELDS and EXPRESSIONS
+ $fields = [];
+ foreach ($this->tables as $alias => $table) {
+ if (!empty($table['all_fields'])) {
+ $fields[] = $this->connection->escapeTable($alias) . '.*';
+ }
+ }
+ foreach ($this->fields as $field) {
+ // Always use the AS keyword for field aliases, as some
+ // databases require it (e.g., PostgreSQL).
+ $fields[] = (isset($field['table']) ? $this->connection->escapeTable($field['table']) . '.' : '') . $this->connection->escapeField($field['field']) . ' AS ' . $this->connection->escapeAlias($field['alias']);
+ }
+ foreach ($this->expressions as $expression) {
+ $fields[] = $expression['expression'] . ' AS ' . $this->connection->escapeAlias($expression['alias']);
+ }
+ $query .= implode(', ', $fields);
+
+
+ // FROM - We presume all queries have a FROM, as any query that doesn't won't need the query builder anyway.
+ $query .= "\nFROM ";
+ foreach ($this->tables as $table) {
+ $query .= "\n";
+ if (isset($table['join type'])) {
+ $query .= $table['join type'] . ' JOIN ';
+ }
+
+ // If the table is a subquery, compile it and integrate it into this query.
+ if ($table['table'] instanceof SelectInterface) {
+ // Run preparation steps on this sub-query before converting to string.
+ $subquery = $table['table'];
+ $subquery->preExecute();
+ $table_string = '(' . (string) $subquery . ')';
+ }
+ else {
+ $table_string = $this->connection->escapeTable($table['table']);
+ // Do not attempt prefixing cross database / schema queries.
+ if (strpos($table_string, '.') === FALSE) {
+ $table_string = '{' . $table_string . '}';
+ }
+ }
+
+ // Don't use the AS keyword for table aliases, as some
+ // databases don't support it (e.g., Oracle).
+ $query .= $table_string . ' ' . $this->connection->escapeTable($table['alias']);
+
+ if (!empty($table['condition'])) {
+ $query .= ' ON ' . (string) $table['condition'];
+ }
+ }
+
+ // WHERE
+ if (count($this->condition)) {
+ // There is an implicit string cast on $this->condition.
+ $query .= "\nWHERE " . $this->condition;
+ }
+
+ // GROUP BY
+ if ($this->group) {
+ $query .= "\nGROUP BY " . implode(', ', $this->group);
+ }
+
+ // HAVING
+ if (count($this->having)) {
+ // There is an implicit string cast on $this->having.
+ $query .= "\nHAVING " . $this->having;
+ }
+
+ // UNION is a little odd, as the select queries to combine are passed into
+ // this query, but syntactically they all end up on the same level.
+ if ($this->union) {
+ foreach ($this->union as $union) {
+ $query .= ' ' . $union['type'] . ' ' . (string) $union['query'];
+ }
+ }
+
+ // ORDER BY
+ if ($this->order) {
+ $query .= "\nORDER BY ";
+ $fields = [];
+ foreach ($this->order as $field => $direction) {
+ $fields[] = $this->connection->escapeField($field) . ' ' . $direction;
+ }
+ $query .= implode(', ', $fields);
+ }
+
+ // RANGE
+ // There is no universal SQL standard for handling range or limit clauses.
+ // Fortunately, all core-supported databases use the same range syntax.
+ // Databases that need a different syntax can override this method and
+ // do whatever alternate logic they need to.
+ if (!empty($this->range)) {
+ $query .= "\nLIMIT " . (int) $this->range['length'] . " OFFSET " . (int) $this->range['start'];
+ }
+
+ if ($this->forUpdate) {
+ $query .= ' FOR UPDATE';
+ }
+
+ return $query;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function __clone() {
+ // On cloning, also clone the dependent objects. However, we do not
+ // want to clone the database connection object as that would duplicate the
+ // connection itself.
+
+ $this->condition = clone($this->condition);
+ $this->having = clone($this->having);
+ foreach ($this->union as $key => $aggregate) {
+ $this->union[$key]['query'] = clone($aggregate['query']);
+ }
+ }
+
+}
projects / yaffs-website / blobdiff