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interface SelectInterface in Drupal 9

Same name and namespace in other branches
  1. 8 core/lib/Drupal/Core/Database/Query/SelectInterface.php \Drupal\Core\Database\Query\SelectInterface

Interface definition for a Select Query object.

Hierarchy

Expanded class hierarchy of SelectInterface

All classes that implement SelectInterface

Related topics

Database abstraction layer
Allow the use of different database servers using the same code base.
27 files declare their use of SelectInterface
AliasRepository.php in core/modules/path_alias/src/AliasRepository.php
block_content.module in core/modules/block_content/block_content.module
Allows the creation of custom blocks through the user interface.
Cache.php in core/lib/Drupal/Core/Cache/Cache.php
CommentSelection.php in core/modules/comment/src/Plugin/EntityReferenceSelection/CommentSelection.php
Condition.php in core/lib/Drupal/Core/Entity/Query/Sql/Condition.php

... See full list

File

core/lib/Drupal/Core/Database/Query/SelectInterface.php, line 12

Namespace

Drupal\Core\Database\Query
View source 
interface SelectInterface extends ConditionInterface, AlterableInterface, ExtendableInterface, PlaceholderInterface {

  /* Alter accessors to expose the query data to alter hooks. */

  /**
   * 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:
   *
   * @code
   * $fields =& $query->getFields();
   * @endcode
   *
   * @return
   *   A reference to the fields array structure.
   */
  public function &getFields();

  /**
   * 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:
   *
   * @code
   * $fields =& $query->getExpressions();
   * @endcode
   *
   * @return
   *   A reference to the expression array structure.
   */
  public function &getExpressions();

  /**
   * Returns a reference to the order by array for this query.
   *
   * Because this method returns by reference, alter hooks may edit the order-by
   * array directly to make their changes. If just adding additional ordering
   * fields, however, the use of orderBy() is preferred.
   *
   * Note that this method must be called by reference as well:
   *
   * @code
   * $fields =& $query->getOrderBy();
   * @endcode
   *
   * @return
   *   A reference to the expression array structure.
   */
  public function &getOrderBy();

  /**
   * Returns a reference to the group-by array for this query.
   *
   * Because this method returns by reference, alter hooks may edit the group-by
   * array directly to make their changes. If just adding additional grouping
   * fields, however, the use of groupBy() is preferred.
   *
   * Note that this method must be called by reference as well:
   *
   * @code
   * $fields =& $query->getGroupBy();
   * @endcode
   *
   * @return
   *   A reference to the group-by array structure.
   */
  public function &getGroupBy();

  /**
   * Returns a reference to the tables array for this query.
   *
   * Because this method returns by reference, alter hooks may edit the tables
   * array directly to make their changes. If just adding tables, however, the
   * use of the join() methods is preferred.
   *
   * Note that this method must be called by reference as well:
   *
   * @code
   * $tables =& $query->getTables();
   * @endcode
   *
   * @return
   *   A reference to the tables array structure.
   */
  public function &getTables();

  /**
   * Returns a reference to the union queries for this query. This include
   * queries for UNION, UNION ALL, and UNION DISTINCT.
   *
   * Because this method returns by reference, alter hooks may edit the tables
   * array directly to make their changes. If just adding union queries,
   * however, the use of the union() method is preferred.
   *
   * Note that this method must be called by reference as well:
   *
   * @code
   * $fields =& $query->getUnion();
   * @endcode
   *
   * @return
   *   A reference to the union query array structure.
   */
  public function &getUnion();

  /**
   * Escapes characters that work as wildcard characters in a LIKE pattern.
   *
   * @param $string
   *   The string to escape.
   *
   * @return string
   *   The escaped string.
   *
   * @see \Drupal\Core\Database\Connection::escapeLike()
   */
  public function escapeLike($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.
   *
   * @param string $string
   *   An unsanitized field name.
   *
   * @return
   *   The sanitized field name string.
   */
  public function escapeField($string);

  /**
   * Compiles and returns an associative array of the arguments for this prepared statement.
   *
   * @param $queryPlaceholder
   *   When collecting the arguments of a subquery, the main placeholder
   *   object should be passed as this parameter.
   *
   * @return
   *   An associative array of all placeholder arguments for this query.
   */
  public function getArguments(PlaceholderInterface $queryPlaceholder = NULL);

  /* Query building operations */

  /**
   * Sets this query to be DISTINCT.
   *
   * @param $distinct
   *   TRUE to flag this query DISTINCT, FALSE to disable it.
   *
   * @return $this
   *   The called object.
   */
  public function distinct($distinct = TRUE);

  /**
   * Adds a field to the list to be SELECTed.
   *
   * @param $table_alias
   *   The name of the table from which the field comes, as an alias. Generally
   *   you will want to use the return value of join() here to ensure that it is
   *   valid.
   * @param $field
   *   The name of the field.
   * @param $alias
   *   The alias for this field. If not specified, one will be generated
   *   automatically based on the $table_alias and $field. The alias will be
   *   checked for uniqueness, so the requested alias may not be the alias
   *   that is assigned in all cases.
   *
   * @return
   *   The unique alias that was assigned for this field.
   */
  public function addField($table_alias, $field, $alias = NULL);

  /**
   * 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 rest.
   *
   * @param $table_alias
   *   The name of the table from which the field comes, as an alias. Generally
   *   you will want to use the return value of join() here to ensure that it is
   *   valid.
   * @param $fields
   *   An indexed array of fields present in the specified table that should be
   *   included in this query. If not specified, $table_alias.* will be generated
   *   without any aliases.
   *
   * @return $this
   *   The called object.
   */
  public function fields($table_alias, array $fields = []);

  /**
   * Adds an expression to the list of "fields" to be SELECTed.
   *
   * An expression can be any arbitrary string that is valid SQL. That includes
   * various functions, which may in some cases be database-dependent. This
   * method makes no effort to correct for database-specific functions.
   *
   * @param $expression
   *   The expression string. May contain placeholders.
   * @param $alias
   *   The alias for this expression. If not specified, one will be generated
   *   automatically in the form "expression_#". The alias will be checked for
   *   uniqueness, so the requested alias may not be the alias that is assigned
   *   in all cases.
   * @param $arguments
   *   Any placeholder arguments needed for this expression.
   *
   * @return
   *   The unique alias that was assigned for this expression.
   */
  public function addExpression($expression, $alias = NULL, $arguments = []);

  /**
   * Default Join against another table in the database.
   *
   * This method is a convenience method for innerJoin().
   *
   * @param $table
   *   The table against which to join. May be a string or another SelectQuery
   *   object. If a query object is passed, it will be used as a subselect.
   *   Unless the table name starts with the database / schema name and a dot
   *   it will be prefixed.
   * @param $alias
   *   The alias for the table. In most cases this should be the first letter
   *   of the table, or the first letter of each "word" in the table.
   * @param $condition
   *   The condition on which to join this table. If the join requires values,
   *   this clause should use a named placeholder and the value or values to
   *   insert should be passed in the 4th parameter. For the first table joined
   *   on a query, this value is ignored as the first table is taken as the base
   *   table. The token %alias can be used in this string to be replaced with
   *   the actual alias. This is useful when $alias is modified by the database
   *   system, for example, when joining the same table more than once.
   * @param $arguments
   *   An array of arguments to replace into the $condition of this join.
   *
   * @return
   *   The unique alias that was assigned for this table.
   */
  public function join($table, $alias = NULL, $condition = NULL, $arguments = []);

  /**
   * Inner Join against another table in the database.
   *
   * @param $table
   *   The table against which to join. May be a string or another SelectQuery
   *   object. If a query object is passed, it will be used as a subselect.
   *   Unless the table name starts with the database / schema name and a dot
   *   it will be prefixed.
   * @param $alias
   *   The alias for the table. In most cases this should be the first letter
   *   of the table, or the first letter of each "word" in the table.
   * @param $condition
   *   The condition on which to join this table. If the join requires values,
   *   this clause should use a named placeholder and the value or values to
   *   insert should be passed in the 4th parameter. For the first table joined
   *   on a query, this value is ignored as the first table is taken as the base
   *   table. The token %alias can be used in this string to be replaced with
   *   the actual alias. This is useful when $alias is modified by the database
   *   system, for example, when joining the same table more than once.
   * @param $arguments
   *   An array of arguments to replace into the $condition of this join.
   *
   * @return
   *   The unique alias that was assigned for this table.
   */
  public function innerJoin($table, $alias = NULL, $condition = NULL, $arguments = []);

  /**
   * Left Outer Join against another table in the database.
   *
   * @param $table
   *   The table against which to join. May be a string or another SelectQuery
   *   object. If a query object is passed, it will be used as a subselect.
   *   Unless the table name starts with the database / schema name and a dot
   *   it will be prefixed.
   * @param $alias
   *   The alias for the table. In most cases this should be the first letter
   *   of the table, or the first letter of each "word" in the table.
   * @param $condition
   *   The condition on which to join this table. If the join requires values,
   *   this clause should use a named placeholder and the value or values to
   *   insert should be passed in the 4th parameter. For the first table joined
   *   on a query, this value is ignored as the first table is taken as the base
   *   table. The token %alias can be used in this string to be replaced with
   *   the actual alias. This is useful when $alias is modified by the database
   *   system, for example, when joining the same table more than once.
   * @param $arguments
   *   An array of arguments to replace into the $condition of this join.
   *
   * @return
   *   The unique alias that was assigned for this table.
   */
  public function leftJoin($table, $alias = NULL, $condition = NULL, $arguments = []);

  /**
   * Join against another table in the database.
   *
   * This method does the "hard" work of queuing up a table to be joined against.
   * In some cases, that may include dipping into the Schema API to find the necessary
   * fields on which to join.
   *
   * @param $type
   *   The type of join. Typically one one of INNER, LEFT OUTER, and RIGHT OUTER.
   * @param $table
   *   The table against which to join. May be a string or another SelectQuery
   *   object. If a query object is passed, it will be used as a subselect.
   *   Unless the table name starts with the database / schema name and a dot
   *   it will be prefixed.
   * @param $alias
   *   The alias for the table. In most cases this should be the first letter
   *   of the table, or the first letter of each "word" in the table. If omitted,
   *   one will be dynamically generated.
   * @param $condition
   *   The condition on which to join this table. If the join requires values,
   *   this clause should use a named placeholder and the value or values to
   *   insert should be passed in the 4th parameter. For the first table joined
   *   on a query, this value is ignored as the first table is taken as the base
   *   table. The token %alias can be used in this string to be replaced with
   *   the actual alias. This is useful when $alias is modified by the database
   *   system, for example, when joining the same table more than once.
   * @param $arguments
   *   An array of arguments to replace into the $condition of this join.
   *
   * @return
   *   The unique alias that was assigned for this table.
   */
  public function addJoin($type, $table, $alias = NULL, $condition = NULL, $arguments = []);

  /**
   * Orders the result set by a given field.
   *
   * If called multiple times, the query will order by each specified field in the
   * order this method is called.
   *
   * If the query uses DISTINCT or GROUP BY conditions, fields or expressions
   * that are used for the order must be selected to be compatible with some
   * databases like PostgreSQL. The PostgreSQL driver can handle simple cases
   * automatically but it is suggested to explicitly specify them. Additionally,
   * when ordering on an alias, the alias must be added before orderBy() is
   * called.
   *
   * @param $field
   *   The field on which to order. The field is escaped for security so only
   *   valid field and alias names are possible. To order by an expression, add
   *   the expression with addExpression() first and then use the alias to order
   *   on.
   *
   *   Example:
   *   @code
   *   $query->addExpression('SUBSTRING([thread], 1, (LENGTH([thread]) - 1))', 'order_field');
   *   $query->orderBy('order_field', 'ASC');
   *   @endcode
   * @param $direction
   *   The direction to sort. Legal values are "ASC" and "DESC". Any other value
   *   will be converted to "ASC".
   *
   * @return $this
   *   The called object.
   */
  public function orderBy($field, $direction = 'ASC');

  /**
   * Orders the result set by a random value.
   *
   * This may be stacked with other orderBy() calls. If so, the query will order
   * by each specified field, including this one, in the order called. Although
   * this method may be called multiple times on the same query, doing so
   * is not particularly useful.
   *
   * Note: The method used by most drivers may not scale to very large result
   * sets. If you need to work with extremely large data sets, you may create
   * your own database driver by subclassing off of an existing driver and
   * implementing your own randomization mechanism. See
   *
   * http://jan.kneschke.de/projects/mysql/order-by-rand/
   *
   * for an example of such an alternate sorting mechanism.
   *
   * @return $this
   *   The called object
   */
  public function orderRandom();

  /**
   * Restricts a query to a given range in the result set.
   *
   * If this method is called with no parameters, will remove any range
   * directives that have been set.
   *
   * @param $start
   *   The first record from the result set to return. If NULL, removes any
   *   range directives that are set.
   * @param $length
   *   The number of records to return from the result set.
   *
   * @return $this
   *   The called object.
   */
  public function range($start = NULL, $length = NULL);

  /**
   * Add another Select query to UNION to this one.
   *
   * Union queries consist of two or more queries whose
   * results are effectively concatenated together. Queries
   * will be UNIONed in the order they are specified, with
   * this object's query coming first. Duplicate columns will
   * be discarded. All forms of UNION are supported, using
   * the second '$type' argument.
   *
   * Note: All queries UNIONed together must have the same
   * field structure, in the same order. It is up to the
   * caller to ensure that they match properly. If they do
   * not, an SQL syntax error will result.
   *
   * @param $query
   *   The query to UNION to this query.
   * @param $type
   *   The type of UNION to add to the query. Defaults to plain
   *   UNION.
   *
   * @return $this
   *   The called object.
   */
  public function union(SelectInterface $query, $type = '');

  /**
   * Groups the result set by the specified field.
   *
   * @param $field
   *   The field on which to group. This should be the field as aliased.
   *
   * @return $this
   *   The called object.
   */
  public function groupBy($field);

  /**
   * Get the equivalent COUNT query of this query as a new query object.
   *
   * @return \Drupal\Core\Database\Query\SelectInterface
   *   A new SelectQuery object with no fields or expressions besides COUNT(*).
   */
  public function countQuery();

  /**
   * Indicates if preExecute() has already been called on that object.
   *
   * @return
   *   TRUE is this query has already been prepared, FALSE otherwise.
   */
  public function isPrepared();

  /**
   * Generic preparation and validation for a SELECT query.
   *
   * @return
   *   TRUE if the validation was successful, FALSE if not.
   */
  public function preExecute(SelectInterface $query = NULL);

  /**
   * Runs the query against the database.
   *
   * @return \Drupal\Core\Database\StatementInterface|null
   *   A prepared statement, or NULL if the query is not valid.
   */
  public function execute();

  /**
   * Helper function to build most common HAVING conditional clauses.
   *
   * This method can take a variable number of parameters. If called with two
   * parameters, they are taken as $field and $value with $operator having a value
   * of IN if $value is an array and = otherwise.
   *
   * @param $field
   *   The name of the field to check. If you would like to add a more complex
   *   condition involving operators or functions, use having().
   * @param $value
   *   The value to test the field against. In most cases, this is a scalar. For more
   *   complex options, it is an array. The meaning of each element in the array is
   *   dependent on the $operator.
   * @param $operator
   *   The comparison operator, such as =, <, or >=. It also accepts more complex
   *   options such as IN, LIKE, or BETWEEN. Defaults to IN if $value is an array
   *   = otherwise.
   *
   * @return \Drupal\Core\Database\Query\ConditionInterface
   *   The called object.
   */
  public function havingCondition($field, $value = NULL, $operator = NULL);

  /**
   * Gets a list of all conditions in the HAVING clause.
   *
   * This method returns by reference. That allows alter hooks to access the
   * data structure directly and manipulate it before it gets compiled.
   *
   * @return array
   *   An array of conditions.
   *
   * @see \Drupal\Core\Database\Query\ConditionInterface::conditions()
   */
  public function &havingConditions();

  /**
   * Gets a list of all values to insert into the HAVING clause.
   *
   * @return array
   *   An associative array of placeholders and values.
   */
  public function havingArguments();

  /**
   * Adds an arbitrary HAVING clause to the query.
   *
   * @param $snippet
   *   A portion of a HAVING clause as a prepared statement. It must use named
   *   placeholders, not ? placeholders.
   * @param $args
   *   (optional) An associative array of arguments.
   *
   * @return $this
   */
  public function having($snippet, $args = []);

  /**
   * Compiles the HAVING clause for later retrieval.
   *
   * @param $connection
   *   The database connection for which to compile the clause.
   */
  public function havingCompile(Connection $connection);

  /**
   * Sets a condition in the HAVING clause that the specified field be NULL.
   *
   * @param $field
   *   The name of the field to check.
   *
   * @return $this
   */
  public function havingIsNull($field);

  /**
   * Sets a condition in the HAVING clause that the specified field be NOT NULL.
   *
   * @param $field
   *   The name of the field to check.
   *
   * @return $this
   */
  public function havingIsNotNull($field);

  /**
   * Sets a HAVING condition that the specified subquery returns values.
   *
   * @param \Drupal\Core\Database\Query\SelectInterface $select
   *   The subquery that must contain results.
   *
   * @return $this
   */
  public function havingExists(SelectInterface $select);

  /**
   * Sets a HAVING condition that the specified subquery returns no values.
   *
   * @param \Drupal\Core\Database\Query\SelectInterface $select
   *   The subquery that must contain results.
   *
   * @return $this
   */
  public function havingNotExists(SelectInterface $select);

  /**
   * Clone magic method.
   *
   * Select queries have dependent objects that must be deep-cloned.  The
   * connection object itself, however, should not be cloned as that would
   * duplicate the connection itself.
   */
  public function __clone();

  /**
   * 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.
   *
   * @param $set
   *   IF TRUE, FOR UPDATE will be added to the query, if FALSE then it won't.
   *
   * @return \Drupal\Core\Database\Query\ConditionInterface
   *   The called object.
   */
  public function forUpdate($set = TRUE);

  /**
   * Returns a string representation of how the query will be executed in SQL.
   *
   * @return string
   *   The Select Query object expressed as a string.
   */
  public function __toString();

}

Members

Namesort descending Modifiers Type Description Overrides
AlterableInterface::addMetaData public function Adds additional metadata to the query. 3
AlterableInterface::addTag public function Adds a tag to a query. 3
AlterableInterface::getMetaData public function Retrieves a given piece of metadata. 3
AlterableInterface::hasAllTags public function Determines if a given query has all specified tags. 3
AlterableInterface::hasAnyTag public function Determines if a given query has any specified tag. 3
AlterableInterface::hasTag public function Determines if a given query has a given tag. 3
ConditionInterface::alwaysFalse public function Sets a condition that is always false. 2
ConditionInterface::andConditionGroup public function Creates a new group of conditions ANDed together. 2
ConditionInterface::arguments public function Gets a complete list of all values to insert into the prepared statement. 2
ConditionInterface::compile public function Compiles the saved conditions for later retrieval. 5
ConditionInterface::compiled public function Check whether a condition has been previously compiled. 2
ConditionInterface::condition public function Helper function: builds the most common conditional clauses.
ConditionInterface::conditionGroupFactory public function Creates an object holding a group of conditions. 2
ConditionInterface::conditions public function Gets the, possibly nested, list of conditions in this conditional clause. 2
ConditionInterface::exists public function Sets a condition that the specified subquery returns values. 5
ConditionInterface::isNotNull public function Sets a condition that the specified field be NOT NULL. 2
ConditionInterface::isNull public function Sets a condition that the specified field be NULL. 2
ConditionInterface::notExists public function Sets a condition that the specified subquery returns no values. 5
ConditionInterface::orConditionGroup public function Creates a new group of conditions ORed together. 2
ConditionInterface::where public function Adds an arbitrary WHERE clause to the query. 2
ExtendableInterface::extend public function Enhance this object by wrapping it in an extender object. 2
PlaceholderInterface::nextPlaceholder public function Returns the next placeholder ID for the query. 3
PlaceholderInterface::uniqueIdentifier public function Returns a unique identifier for this object. 3
SelectInterface::addExpression public function Adds an expression to the list of "fields" to be SELECTed. 2
SelectInterface::addField public function Adds a field to the list to be SELECTed. 2
SelectInterface::addJoin public function Join against another table in the database. 2
SelectInterface::countQuery public function Get the equivalent COUNT query of this query as a new query object. 2
SelectInterface::distinct public function Sets this query to be DISTINCT. 2
SelectInterface::escapeField public function Escapes a field name string. 2
SelectInterface::escapeLike public function Escapes characters that work as wildcard characters in a LIKE pattern. 2
SelectInterface::execute public function Runs the query against the database. 1
SelectInterface::fields public function Add multiple fields from the same table to be SELECTed. 2
SelectInterface::forUpdate public function Add FOR UPDATE to the query. 2
SelectInterface::getArguments public function Compiles and returns an associative array of the arguments for this prepared statement. 2
SelectInterface::getExpressions public function Returns a reference to the expressions array for this query. 2
SelectInterface::getFields public function Returns a reference to the fields array for this query. 2
SelectInterface::getGroupBy public function Returns a reference to the group-by array for this query. 2
SelectInterface::getOrderBy public function Returns a reference to the order by array for this query. 2
SelectInterface::getTables public function Returns a reference to the tables array for this query. 2
SelectInterface::getUnion public function Returns a reference to the union queries for this query. This include queries for UNION, UNION ALL, and UNION DISTINCT. 2
SelectInterface::groupBy public function Groups the result set by the specified field. 2
SelectInterface::having public function Adds an arbitrary HAVING clause to the query. 2
SelectInterface::havingArguments public function Gets a list of all values to insert into the HAVING clause. 2
SelectInterface::havingCompile public function Compiles the HAVING clause for later retrieval. 2
SelectInterface::havingCondition public function Helper function to build most common HAVING conditional clauses. 2
SelectInterface::havingConditions public function Gets a list of all conditions in the HAVING clause. 2
SelectInterface::havingExists public function Sets a HAVING condition that the specified subquery returns values. 2
SelectInterface::havingIsNotNull public function Sets a condition in the HAVING clause that the specified field be NOT NULL. 2
SelectInterface::havingIsNull public function Sets a condition in the HAVING clause that the specified field be NULL. 2
SelectInterface::havingNotExists public function Sets a HAVING condition that the specified subquery returns no values. 2
SelectInterface::innerJoin public function Inner Join against another table in the database. 2
SelectInterface::isPrepared public function Indicates if preExecute() has already been called on that object. 2
SelectInterface::join public function Default Join against another table in the database. 2
SelectInterface::leftJoin public function Left Outer Join against another table in the database. 2
SelectInterface::orderBy public function Orders the result set by a given field. 2
SelectInterface::orderRandom public function Orders the result set by a random value. 2
SelectInterface::preExecute public function Generic preparation and validation for a SELECT query. 2
SelectInterface::range public function Restricts a query to a given range in the result set. 2
SelectInterface::union public function Add another Select query to UNION to this one. 2
SelectInterface::__clone public function Clone magic method. 1
SelectInterface::__toString public function Returns a string representation of how the query will be executed in SQL. 1