interface TableMappingInterface in Drupal 8

Provides a common interface for mapping field columns to SQL tables.

Warning: using methods provided here should be done only when writing code that is explicitly targeting a SQL-based entity storage. Typically this API is used by SQL storage classes, or other SQL-specific code like the Views integration code for the Entity SQL storage. Another example of legal usage of this API is when needing to write a query that \Drupal::entityQuery() does not support. Always retrieve entity identifiers and use them to load entities instead of accessing data stored in the database directly. Any other usage circumvents the entity system and is strongly discouraged, at least when writing contributed code.

Hierarchy

• interface \Drupal\Core\Entity\Sql\TableMappingInterface

3 files declare their use of TableMappingInterface

EntityViewsData.php in core/modules/views/src/EntityViewsData.php

Tables.php in core/lib/Drupal/Core/Entity/Query/Sql/Tables.php

TermStorage.php in core/modules/taxonomy/src/TermStorage.php

File

core/lib/Drupal/Core/Entity/Sql/TableMappingInterface.php, line 20

Namespace

Drupal\Core\Entity\Sql

interface TableMappingInterface {

  /**
   * A property that represents delta used in entity query conditions.
   */
  const DELTA = '%delta';

  /**
   * Gets a list of table names for this mapping.
   *
   * @return string[]
   *   An array of table names.
   */
  public function getTableNames();

  /**
   * Gets a list of all database columns for a given table.
   *
   * @param string $table_name
   *   The name of the table to return the columns for.
   *
   * @return string[]
   *   An array of database column names for this table. Both field columns and
   *   extra columns are returned.
   */
  public function getAllColumns($table_name);

  /**
   * Gets a list of names for entity fields stored in the specified table.
   *
   * The return list is contains the entity field names, not database field
   * (i.e. column) names. To get the mapping of specific entity field to
   * database columns use ::getColumnNames().
   *
   * @param string $table_name
   *   The name of the table to return the field names for.
   *
   * @return string[]
   *   An array of field names for the given table.
   */
  public function getFieldNames($table_name);

  /**
   * Gets a mapping of field columns to database columns for a given field.
   *
   * @param string $field_name
   *   The name of the entity field to return the column mapping for.
   *
   * @return string[]
   *   The keys of this array are the keys of the array returned by
   *   FieldStorageDefinitionInterface::getColumns() while the respective values
   *   are the names of the database columns for this table mapping.
   */
  public function getColumnNames($field_name);

  /**
   * Gets a list of extra database columns, which store denormalized data.
   *
   * These database columns do not belong to any entity fields. Any normalized
   * data that is stored should be associated with an entity field.
   *
   * @param string $table_name
   *   The name of the table to return the columns for.
   *
   * @return string[]
   *   An array of column names for the given table.
   */
  public function getExtraColumns($table_name);

  /**
   * Gets the list of columns that can not be used as field type columns.
   *
   * @return array
   */
  public function getReservedColumns();

  /**
   * Generates a column name for a field property.
   *
   * @param \Drupal\Core\Field\FieldStorageDefinitionInterface $storage_definition
   *   The field storage definition.
   * @param string $property_name
   *   The name of the property.
   *
   * @return string
   *   A string containing a generated column name for a field data table that is
   *   unique among all other fields.
   */
  public function getFieldColumnName(FieldStorageDefinitionInterface $storage_definition, $property_name);

  /**
   * Gets the table name for a given column.
   *
   * @param string $field_name
   *   The name of the entity field to return the column mapping for.
   *
   * @return string
   *   Table name for the given field.
   *
   * @throws \Drupal\Core\Entity\Sql\SqlContentEntityStorageException
   */
  public function getFieldTableName($field_name);

}

Members

Name	Modifiers	Type	Description	Overrides
TableMappingInterface::DELTA		constant	A property that represents delta used in entity query conditions.
TableMappingInterface::getAllColumns	public	function	Gets a list of all database columns for a given table.	1
TableMappingInterface::getColumnNames	public	function	Gets a mapping of field columns to database columns for a given field.	1
TableMappingInterface::getExtraColumns	public	function	Gets a list of extra database columns, which store denormalized data.	1
TableMappingInterface::getFieldColumnName	public	function	Generates a column name for a field property.	1
TableMappingInterface::getFieldNames	public	function	Gets a list of names for entity fields stored in the specified table.	1
TableMappingInterface::getFieldTableName	public	function	Gets the table name for a given column.	1
TableMappingInterface::getReservedColumns	public	function	Gets the list of columns that can not be used as field type columns.	1
TableMappingInterface::getTableNames	public	function	Gets a list of table names for this mapping.	1