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<?php
namespace SMW\SQLStore;
use SMW\SQLStore\TableBuilder\Table;
/**
* @private
*
* Provides generic creation and updating function for database tables. A builder
* that implements this interface is expected to define Database specific
* operations and allowing it to be executed on a specific RDBMS back-end.
*
* @license GNU GPL v2+
* @since 2.5
*
* @author mwjames
*/
interface TableBuilder {
/**
* Common prefix used by all Semantic MediaWiki tables
*/
const TABLE_PREFIX = 'smw_';
/**
* Processing field activity status
*/
const PROC_FIELD_NEW = 'field.new';
/**
* Processing field activity status
*/
const PROC_FIELD_UPD = 'field.update';
/**
* Processing field activity status
*/
const PROC_FIELD_DROP = 'field.drop';
/**
* On before the creation of tables and indices
*/
const PRE_CREATION = 'pre.creation';
/**
* On after creation of all tables
*/
const POST_CREATION = 'post.creation';
/**
* On after dropping all tables
*/
const POST_DESTRUCTION = 'post.destruction';
/**
* Generic creation and updating function for database tables. Ideally, it
* would be able to modify a table's signature in arbitrary ways, but it will
* fail for some changes. Its string-based interface is somewhat too
* impoverished for a permanent solution. It would be possible to go for update
* scripts (specific to each change) in the style of MediaWiki instead.
*
* Make sure the table of the given name has the given fields, provided
* as an array with entries fieldname => typeparams. typeparams should be
* in a normalised form and order to match to existing values.
*
* The function returns an array that includes all columns that have been
* changed. For each such column, the array contains an entry
* columnname => action, where action is one of 'up', 'new', or 'del'
*
* @note The function partly ignores the order in which fields are set up.
* Only if the type of some field changes will its order be adjusted explicitly.
*
* @since 2.5
*
* @param Table $table
*/
public function create( Table $table );
/**
* Removes a table from the RDBMS backend.
*
* @since 2.5
*
* @param Table $table
*/
public function drop( Table $table );
/**
* Performs analysis on a key distribution and stores the distribution so
* that the query planner can use these statistics to help determine the
* most efficient execution plans for queries.
*
* @since 3.0
*
* @param Table $table
*/
public function optimize( Table $table );
/**
* Database backends often have different types that need to be used
* repeatedly in (Semantic) MediaWiki. This function provides the
* preferred type (as a string) for various common kinds of columns.
* The input is one of the following strings: 'id' (page id numbers or
* similar), 'title' (title strings or similar), 'namespace' (namespace
* numbers), 'blob' (longer text blobs), 'iw' (interwiki prefixes).
*
* @since 2.5
*
* @param string|FieldType $fieldType
*
* @return string|false SQL type declaration
*/
public function getStandardFieldType( $fieldType );
/**
* Returns a list of process activities
*
* @since 3.0
*
* @param array
*/
public function getLog();
/**
* Allows to check and validate the build on specific events
*
* @since 2.5
*
* @param string $event
*/
public function checkOn( $event );
}
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