| <?php |
| /** |
| * File containing the ezcDbSchema class. |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| * @package DatabaseSchema |
| * @version //autogentag// |
| * @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0 |
| */ |
| |
| /** |
| * ezcDbSchema is the main class for schema operations. |
| * |
| * ezcDbSchema represents the schema itself and provide proxy methods to the |
| * handlers that are able to load/save schemas from/to files, databases or other |
| * sources/destinations, depending on available schema handlers. |
| * |
| * A database schema is a definition of all the tables inside a database, |
| * including field definitions and indexes. |
| * |
| * The available builtin handlers are currently for MySQL, XML files and PHP |
| * arrays. |
| * |
| * The following example shows you how you can load a database schema |
| * from the PHP format and store it into the XML format. |
| * <code> |
| * $schema = ezcDbSchema::createFromFile( 'array', 'file.php' ); |
| * $schema->writeToFile( 'xml', 'file.xml' ); |
| * </code> |
| * |
| * The following example shows how you can load a database schema |
| * from the XML format and store it into a database. |
| * <code> |
| * $db = ezcDbFactory::create( 'mysql://user:password@host/database' ); |
| * $schema = ezcDbSchema::createFromFile( 'xml', 'file.php' ); |
| * $schema->writeToDb( $db ); |
| * </code> |
| * |
| * Example that shows how to make a comparison between a file on disk and a |
| * database, and how to apply the changes. |
| * <code> |
| * $xmlSchema = ezcDbSchema::createFromFile( 'xml', 'wanted-schema.xml' ); |
| * $dbSchema = ezcDbSchema::createFromDb( $db ); |
| * $diff = ezcDbSchemaComparator::compareSchemas( $xmlSchema, $dbSchema ); |
| * $diff->applyToDb( $db ); |
| * </code> |
| * |
| * @see ezcDbSchemaTable |
| * @see ezcDbSchemaField |
| * @see ezcDbSchemaIndex |
| * @see ezcDbSchemaIndexField |
| * |
| * @package DatabaseSchema |
| * @version //autogentag// |
| * @mainclass |
| */ |
| class ezcDbSchema |
| { |
| /** |
| * Used by reader and writer classes to inform that it implements a file |
| * based handler. |
| */ |
| const FILE = 1; |
| |
| /** |
| * Used by reader and writer classes to inform that it implements a |
| * database based handler. |
| */ |
| const DATABASE = 2; |
| |
| /** |
| * Stores the schema information. |
| * |
| * @var array(string=>ezcDbSchemaTable) |
| */ |
| private $schema; |
| |
| /** |
| * Meant to store data - not currently in use |
| * |
| * @var array |
| */ |
| private $data; |
| |
| /** |
| * A list of all the supported database filed types |
| * |
| * @var array(string) |
| */ |
| static public $supportedTypes = array( |
| 'integer', 'boolean', 'float', 'decimal', 'timestamp', 'time', 'date', |
| 'text', 'blob', 'clob' |
| ); |
| |
| /** |
| * Contains the options that are used by creating new schemas. |
| * |
| * @var ezcDbSchemaOptions |
| */ |
| static public $options; |
| |
| /** |
| * Constructs a new ezcDbSchema object with schema definition $schema. |
| * |
| * @param array(ezcDbSchemaTable) $schema |
| * @param array $data |
| */ |
| public function __construct( array $schema, $data = array() ) |
| { |
| self::initOptions(); |
| $this->schema = $schema; |
| $this->data = $data; |
| } |
| |
| /** |
| * Checks whether the object in $obj implements the correct $type of reader handler. |
| * |
| * @throws ezcDbSchemaInvalidReaderClassException if the object in $obj is |
| * not a schema reader of the correct type. |
| * |
| * @param ezcDbSchemaReader $obj |
| * @param int $type |
| */ |
| static private function checkSchemaReader( ezcDbSchemaReader $obj, $type ) |
| { |
| if ( !( ( $obj->getReaderType() & $type ) == $type ) ) |
| { |
| throw new ezcDbSchemaInvalidReaderClassException( get_class( $obj ), $type ); |
| } |
| } |
| |
| /** |
| * Factory method to create a ezcDbSchema object from the file $file with the format $format. |
| * |
| * @throws ezcDbSchemaInvalidReaderClassException if the handler associated |
| * with the $format is not a file schema reader. |
| * |
| * @param string $format |
| * @param string $file |
| */ |
| static public function createFromFile( $format, $file ) |
| { |
| $className = ezcDbSchemaHandlerManager::getReaderByFormat( $format ); |
| $reader = new $className(); |
| self::checkSchemaReader( $reader, self::FILE ); |
| return $reader->loadFromFile( $file ); |
| } |
| |
| /** |
| * Factory method to create a ezcDbSchema object from the database $db. |
| * |
| * @throws ezcDbSchemaInvalidReaderClassException if the handler associated |
| * with the $format is not a database schema reader. |
| * |
| * @param ezcDbHandler $db |
| */ |
| static public function createFromDb( ezcDbHandler $db ) |
| { |
| self::initOptions(); |
| $className = ezcDbSchemaHandlerManager::getReaderByFormat( $db->getName() ); |
| $reader = new $className(); |
| self::checkSchemaReader( $reader, self::DATABASE ); |
| return $reader->loadFromDb( $db ); |
| } |
| |
| /** |
| * Checks whether the object in $obj implements the correct $type of writer handler. |
| * |
| * @throws ezcDbSchemaInvalidWriterClassException if the object in $obj is |
| * not a schema writer of the correct type. |
| * |
| * @param ezcDbSchemaWriter $obj |
| * @param int $type |
| */ |
| static private function checkSchemaWriter( $obj, $type ) |
| { |
| if ( !( ( $obj->getWriterType() & $type ) == $type ) ) |
| { |
| throw new ezcDbSchemaInvalidWriterClassException( get_class( $obj ), $type ); |
| } |
| } |
| |
| /** |
| * Writes the schema to the file $file in format $format. |
| * |
| * @throws ezcDbSchemaInvalidWriterClassException if the handler associated |
| * with the $format is not a file schema writer. |
| * |
| * @param string $format Available formats are at least: 'array' and 'xml'. |
| * @param string $file |
| */ |
| public function writeToFile( $format, $file ) |
| { |
| $className = ezcDbSchemaHandlerManager::getWriterByFormat( $format ); |
| $reader = new $className(); |
| self::checkSchemaWriter( $reader, self::FILE ); |
| $reader->saveToFile( $file, $this ); |
| } |
| |
| /** |
| * Creates the tables defined in the schema into the database specified through $db. |
| * |
| * @throws ezcDbSchemaInvalidWriterClassException if the handler associated |
| * with the $format is not a database schema writer. |
| * |
| * @param ezcDbHandler $db |
| */ |
| public function writeToDb( ezcDbHandler $db ) |
| { |
| self::initOptions(); |
| $className = ezcDbSchemaHandlerManager::getWriterByFormat( $db->getName() ); |
| $writer = new $className(); |
| self::checkSchemaWriter( $writer, self::DATABASE ); |
| $writer->saveToDb( $db, $this ); |
| } |
| |
| /** |
| * Returns the $db specific SQL queries that would create the tables |
| * defined in the schema. |
| * |
| * The database type can be given as both a database handler (instanceof |
| * ezcDbHandler) or the name of the database as string as retrieved through |
| * calling getName() on the database handler object. |
| * |
| * @see ezcDbHandler::getName() |
| * |
| * @throws ezcDbSchemaInvalidWriterClassException if the handler associated |
| * with the $format is not a database schema writer. |
| * |
| * @param string|ezcDbHandler $db |
| * @return array(string) |
| */ |
| public function convertToDDL( $db ) |
| { |
| self::initOptions(); |
| if ( $db instanceof ezcDbHandler ) |
| { |
| $db = $db->getName(); |
| } |
| $className = ezcDbSchemaHandlerManager::getDiffWriterByFormat( $db ); |
| $writer = new $className(); |
| self::checkSchemaWriter( $writer, self::DATABASE ); |
| return $writer->convertToDDL( $this ); |
| } |
| |
| /** |
| * Returns the internal schema by reference. |
| * |
| * The method returns an array where the key is the table name, and the |
| * value the table definition stored in a ezcDbSchemaTable struct. |
| * |
| * @return array(string=>ezcDbSchemaTable) |
| */ |
| public function &getSchema() |
| { |
| return $this->schema; |
| } |
| |
| /** |
| * Returns the internal data. |
| * |
| * This data is not used anywhere though. |
| * |
| * @return array |
| */ |
| public function getData() |
| { |
| return $this->data; |
| } |
| |
| /** |
| * Associates an option object with this static class. |
| * |
| * @param ezcDbSchemaOptions $options |
| */ |
| static public function setOptions( ezcDbSchemaOptions $options ) |
| { |
| self::$options = $options; |
| } |
| |
| /** |
| * Checks whether the static options have been initialized, and if not it |
| * creates a new options class and assigns it to the options statick |
| * property. |
| * |
| * Usually the option object is initialized in the constructor, but that of |
| * course does not work for static classes. |
| */ |
| static private function initOptions() |
| { |
| if ( !ezcDbSchema::$options ) |
| { |
| ezcDbSchema::$options = new ezcDbSchemaOptions(); |
| } |
| } |
| |
| /** |
| * Returns an object to represent a table in the schema. |
| * |
| * @param array(string=>ezcDbSchemaField) $fields |
| * @param array(string=>ezcDbSchemaIndex) $indexes |
| * @return ezcDbSchemaTable or an inherited class |
| */ |
| static public function createNewTable( $fields, $indexes ) |
| { |
| self::initOptions(); |
| $className = ezcDbSchema::$options->tableClassName; |
| return new $className( $fields, $indexes ); |
| } |
| |
| /** |
| * Returns an object to represent a table's field in the schema. |
| * |
| * @param string $fieldType |
| * @param integer $fieldLength |
| * @param bool $fieldNotNull |
| * @param mixed $fieldDefault |
| * @param bool $fieldAutoIncrement |
| * @param bool $fieldUnsigned |
| * @return ezcDbSchemaField or an inherited class |
| */ |
| static public function createNewField( $fieldType, $fieldLength, $fieldNotNull, $fieldDefault, $fieldAutoIncrement, $fieldUnsigned ) |
| { |
| self::initOptions(); |
| $className = ezcDbSchema::$options->fieldClassName; |
| return new $className( $fieldType, $fieldLength, $fieldNotNull, $fieldDefault, $fieldAutoIncrement, $fieldUnsigned ); |
| } |
| |
| /** |
| * Returns an object to represent a table's field in the schema. |
| * |
| * @param array(string=>ezcDbSchemaIndexField) $fields |
| * @param bool $primary |
| * @param bool $unique |
| * @return ezcDbSchemaIndex or an inherited class |
| */ |
| static public function createNewIndex( $fields, $primary, $unique ) |
| { |
| self::initOptions(); |
| $className = ezcDbSchema::$options->indexClassName; |
| return new $className( $fields, $primary, $unique ); |
| } |
| |
| /** |
| * Returns an object to represent a table's field in the schema. |
| * |
| * @param int $sorting |
| * @return ezcDbSchemaIndexField or an inherited class |
| */ |
| static public function createNewIndexField( $sorting = null ) |
| { |
| self::initOptions(); |
| $className = ezcDbSchema::$options->indexFieldClassName; |
| return new $className( $sorting ); |
| } |
| } |
| ?> |