public &SelectExtender::getFields() Returns a reference to the fields array for this query. Because this method returns by reference, alter hooks may edit the fields array directly to make their changes. If just adding fields, however, the use of addField() is preferred. Note that this method must be called by reference as well: $fields =& $query->getFields(); Return value A reference to the fields array structure. Overrides SelectInterface::getFields File core/lib/Drupal/Core/Data

public &SelectExtender::getExpressions() Returns a reference to the expressions array for this query. Because this method returns by reference, alter hooks may edit the expressions array directly to make their changes. If just adding expressions, however, the use of addExpression() is preferred. Note that this method must be called by reference as well: $fields =& $query->getExpressions(); Return value A reference to the expression array structure. Overrides SelectInterface::getExp

public SelectExtender::getArguments(PlaceholderInterface $queryPlaceholder = NULL) Compiles and returns an associative array of the arguments for this prepared statement. Parameters $queryPlaceholder: When collecting the arguments of a subquery, the main placeholder object should be passed as this parameter. Return value An associative array of all placeholder arguments for this query. Overrides SelectInterface::getArguments File core/lib/Drupal/Core/Database/Query/SelectExtender.php, line 28

public SelectExtender::forUpdate($set = TRUE) Add FOR UPDATE to the query. FOR UPDATE prevents the rows retrieved by the SELECT statement from being modified or deleted by other transactions until the current transaction ends. Other transactions that attempt UPDATE, DELETE, or SELECT FOR UPDATE of these rows will be blocked until the current transaction ends. Parameters $set: IF TRUE, FOR UPDATE will be added to the query, if FALSE then it won't. Return value \Drupal\Core\Database\Query\Condi

public SelectExtender::fields($table_alias, array $fields = array()) Add multiple fields from the same table to be SELECTed. This method does not return the aliases set for the passed fields. In the majority of cases that is not a problem, as the alias will be the field name. However, if you do need to know the alias you can call getFields() and examine the result to determine what alias was created. Alternatively, simply use addField() for the few fields you care about and this method for the

public SelectExtender::extend($extender_name) Enhance this object by wrapping it in an extender object. Parameters $extender_name: The fully-qualified name of the extender class, without the leading '\' (for example, Drupal\my_module\myExtenderClass). The extender name will be checked against the current database connection to allow driver-specific subclasses as well, using the same logic as the query objects themselves. Return value \Drupal\Core\Database\Query\ExtendableInterface The extende

public SelectExtender::exists(SelectInterface $select) Sets a condition that the specified subquery returns values. Parameters \Drupal\Core\Database\Query\SelectInterface $select: The subquery that must contain results. Return value \Drupal\Core\Database\Query\ConditionInterface The called object. Overrides ConditionInterface::exists File core/lib/Drupal/Core/Database/Query/SelectExtender.php, line 459 Class SelectExtender The base extender class for Select queries. Namespace Drupal\C

public SelectExtender::execute() Runs the query against the database. Return value \Drupal\Core\Database\StatementInterface|null A prepared statement, or NULL if the query is not valid. Overrides SelectInterface::execute File core/lib/Drupal/Core/Database/Query/SelectExtender.php, line 309 Class SelectExtender The base extender class for Select queries. Namespace Drupal\Core\Database\Query Code public function execute() { // By calling preExecute() here, we force it to preprocess th

public SelectExtender::escapeLike($string) Escapes characters that work as wildcard characters in a LIKE pattern. Parameters $string: The string to escape. Return value string The escaped string. Overrides SelectInterface::escapeLike See also \Drupal\Core\Database\Connection::escapeLike() File core/lib/Drupal/Core/Database/Query/SelectExtender.php, line 268 Class SelectExtender The base extender class for Select queries. Namespace Drupal\Core\Database\Query Code public function esca

public SelectExtender::escapeField($string) Escapes a field name string. Force all field names to be strictly alphanumeric-plus-underscore. For some database drivers, it may also wrap the field name in database-specific escape characters. Parameters string $string: An unsanitized field name. Return value The sanitized field name string. Overrides SelectInterface::escapeField File core/lib/Drupal/Core/Database/Query/SelectExtender.php, line 275 Class SelectExtender The base extender class