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<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\db;
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use Yii;
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use yii\base\Object;
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use yii\base\NotSupportedException;
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use yii\base\InvalidCallException;
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use yii\caching\Cache;
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use yii\caching\GroupDependency;
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/**
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* Schema is the base class for concrete DBMS-specific schema classes.
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*
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* Schema represents the database schema information that is DBMS specific.
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*
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* @property QueryBuilder $queryBuilder the query builder for the DBMS represented by this schema
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* @property array $tableNames the names of all tables in this database.
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* @property array $tableSchemas the schema information for all tables in this database.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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abstract class Schema extends Object
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{
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/**
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* The followings are the supported abstract column data types.
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*/
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const TYPE_PK = 'pk';
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const TYPE_STRING = 'string';
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const TYPE_TEXT = 'text';
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const TYPE_SMALLINT = 'smallint';
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const TYPE_INTEGER = 'integer';
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const TYPE_BIGINT = 'bigint';
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const TYPE_FLOAT = 'float';
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const TYPE_DECIMAL = 'decimal';
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const TYPE_DATETIME = 'datetime';
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const TYPE_TIMESTAMP = 'timestamp';
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const TYPE_TIME = 'time';
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const TYPE_DATE = 'date';
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const TYPE_BINARY = 'binary';
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const TYPE_BOOLEAN = 'boolean';
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const TYPE_MONEY = 'money';
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/**
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* @var Connection the database connection
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*/
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public $db;
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/**
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* @var array list of ALL table names in the database
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*/
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private $_tableNames = array();
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/**
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* @var array list of loaded table metadata (table name => TableSchema)
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*/
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private $_tables = array();
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/**
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* @var QueryBuilder the query builder for this database
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*/
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private $_builder;
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/**
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* Loads the metadata for the specified table.
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* @param string $name table name
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* @return TableSchema DBMS-dependent table metadata, null if the table does not exist.
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*/
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abstract protected function loadTableSchema($name);
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/**
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* Obtains the metadata for the named table.
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* @param string $name table name. The table name may contain schema name if any. Do not quote the table name.
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* @param boolean $refresh whether to reload the table schema even if it is found in the cache.
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* @return TableSchema table metadata. Null if the named table does not exist.
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*/
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public function getTableSchema($name, $refresh = false)
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{
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if (isset($this->_tables[$name]) && !$refresh) {
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return $this->_tables[$name];
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}
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$db = $this->db;
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$realName = $this->getRawTableName($name);
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if ($db->enableSchemaCache && !in_array($name, $db->schemaCacheExclude, true)) {
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/** @var $cache Cache */
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$cache = is_string($db->schemaCache) ? Yii::$app->getComponent($db->schemaCache) : $db->schemaCache;
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if ($cache instanceof Cache) {
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$key = $this->getCacheKey($name);
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if ($refresh || ($table = $cache->get($key)) === false) {
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$table = $this->loadTableSchema($realName);
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if ($table !== null) {
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$cache->set($key, $table, $db->schemaCacheDuration, new GroupDependency($this->getCacheGroup()));
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}
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}
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return $this->_tables[$name] = $table;
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}
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}
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return $this->_tables[$name] = $table = $this->loadTableSchema($realName);
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}
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/**
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* Returns the cache key for the specified table name.
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* @param string $name the table name
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* @return mixed the cache key
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*/
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protected function getCacheKey($name)
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{
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return array(
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__CLASS__,
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$this->db->dsn,
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$this->db->username,
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$name,
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);
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}
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/**
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* Returns the cache group name.
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* This allows [[refresh()]] to invalidate all cached table schemas.
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* @return string the cache group name
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*/
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protected function getCacheGroup()
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{
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return md5(serialize(array(
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__CLASS__,
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$this->db->dsn,
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$this->db->username,
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)));
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}
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/**
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* Returns the metadata for all tables in the database.
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* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema name.
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* @param boolean $refresh whether to fetch the latest available table schemas. If this is false,
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* cached data may be returned if available.
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* @return array the metadata for all tables in the database.
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* Each array element is an instance of [[TableSchema]] or its child class.
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*/
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public function getTableSchemas($schema = '', $refresh = false)
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{
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$tables = array();
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foreach ($this->getTableNames($schema, $refresh) as $name) {
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if ($schema !== '') {
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$name = $schema . '.' . $name;
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}
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if (($table = $this->getTableSchema($name, $refresh)) !== null) {
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$tables[] = $table;
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}
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}
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return $tables;
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}
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/**
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* Returns all table names in the database.
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* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema name.
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* If not empty, the returned table names will be prefixed with the schema name.
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* @param boolean $refresh whether to fetch the latest available table names. If this is false,
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* table names fetched previously (if available) will be returned.
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* @return array all table names in the database.
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*/
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public function getTableNames($schema = '', $refresh = false)
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{
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if (!isset($this->_tableNames[$schema]) || $refresh) {
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$this->_tableNames[$schema] = $this->findTableNames($schema);
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}
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return $this->_tableNames[$schema];
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}
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/**
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* @return QueryBuilder the query builder for this connection.
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*/
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public function getQueryBuilder()
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{
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if ($this->_builder === null) {
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$this->_builder = $this->createQueryBuilder();
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}
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return $this->_builder;
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}
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/**
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* Refreshes the schema.
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* This method cleans up all cached table schemas so that they can be re-created later
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* to reflect the database schema change.
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*/
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public function refresh()
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{
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/** @var $cache Cache */
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$cache = is_string($this->db->schemaCache) ? Yii::$app->getComponent($this->db->schemaCache) : $this->db->schemaCache;
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if ($this->db->enableSchemaCache && $cache instanceof Cache) {
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GroupDependency::invalidate($cache, $this->getCacheGroup());
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}
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$this->_tableNames = array();
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$this->_tables = array();
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}
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/**
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* Creates a query builder for the database.
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* This method may be overridden by child classes to create a DBMS-specific query builder.
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* @return QueryBuilder query builder instance
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*/
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public function createQueryBuilder()
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{
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return new QueryBuilder($this->db);
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}
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/**
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* Returns all table names in the database.
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* This method should be overridden by child classes in order to support this feature
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* because the default implementation simply throws an exception.
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* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
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* @return array all table names in the database. The names have NO the schema name prefix.
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* @throws NotSupportedException if this method is called
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*/
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protected function findTableNames($schema = '')
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{
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throw new NotSupportedException(get_class($this) . ' does not support fetching all table names.');
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}
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/**
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* Returns the ID of the last inserted row or sequence value.
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* @param string $sequenceName name of the sequence object (required by some DBMS)
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* @return string the row ID of the last row inserted, or the last value retrieved from the sequence object
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* @throws InvalidCallException if the DB connection is not active
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* @see http://www.php.net/manual/en/function.PDO-lastInsertId.php
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*/
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public function getLastInsertID($sequenceName = '')
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{
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if ($this->db->isActive) {
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return $this->db->pdo->lastInsertId($sequenceName);
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} else {
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throw new InvalidCallException('DB Connection is not active.');
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}
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}
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/**
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* Quotes a string value for use in a query.
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* Note that if the parameter is not a string, it will be returned without change.
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* @param string $str string to be quoted
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* @return string the properly quoted string
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* @see http://www.php.net/manual/en/function.PDO-quote.php
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*/
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public function quoteValue($str)
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{
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if (!is_string($str)) {
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return $str;
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}
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$this->db->open();
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if (($value = $this->db->pdo->quote($str)) !== false) {
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return $value;
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} else { // the driver doesn't support quote (e.g. oci)
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return "'" . addcslashes(str_replace("'", "''", $str), "\000\n\r\\\032") . "'";
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}
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}
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/**
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* Quotes a table name for use in a query.
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* If the table name contains schema prefix, the prefix will also be properly quoted.
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* If the table name is already quoted or contains '(' or '{{',
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* then this method will do nothing.
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* @param string $name table name
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* @return string the properly quoted table name
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* @see quoteSimpleTableName
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*/
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public function quoteTableName($name)
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{
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if (strpos($name, '(') !== false || strpos($name, '{{') !== false) {
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return $name;
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}
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if (strpos($name, '.') === false) {
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return $this->quoteSimpleTableName($name);
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}
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$parts = explode('.', $name);
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foreach ($parts as $i => $part) {
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$parts[$i] = $this->quoteSimpleTableName($part);
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}
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return implode('.', $parts);
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}
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/**
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* Quotes a column name for use in a query.
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* If the column name contains prefix, the prefix will also be properly quoted.
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* If the column name is already quoted or contains '(', '[[' or '{{',
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* then this method will do nothing.
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* @param string $name column name
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* @return string the properly quoted column name
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* @see quoteSimpleColumnName
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*/
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public function quoteColumnName($name)
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{
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if (strpos($name, '(') !== false || strpos($name, '[[') !== false || strpos($name, '{{') !== false) {
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return $name;
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}
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if (($pos = strrpos($name, '.')) !== false) {
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$prefix = $this->quoteTableName(substr($name, 0, $pos)) . '.';
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$name = substr($name, $pos + 1);
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} else {
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$prefix = '';
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}
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return $prefix . $this->quoteSimpleColumnName($name);
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}
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/**
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* Quotes a simple table name for use in a query.
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* A simple table name should contain the table name only without any schema prefix.
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* If the table name is already quoted, this method will do nothing.
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* @param string $name table name
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* @return string the properly quoted table name
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*/
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public function quoteSimpleTableName($name)
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{
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return strpos($name, "'") !== false ? $name : "'" . $name . "'";
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}
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/**
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* Quotes a simple column name for use in a query.
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* A simple column name should contain the column name only without any prefix.
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* If the column name is already quoted or is the asterisk character '*', this method will do nothing.
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* @param string $name column name
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* @return string the properly quoted column name
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*/
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public function quoteSimpleColumnName($name)
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{
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return strpos($name, '"') !== false || $name === '*' ? $name : '"' . $name . '"';
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}
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/**
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* Returns the actual name of a given table name.
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* This method will strip off curly brackets from the given table name
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* and replace the percentage character '%' with [[Connection::tablePrefix]].
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* @param string $name the table name to be converted
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* @return string the real name of the given table name
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*/
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public function getRawTableName($name)
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{
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if (strpos($name, '{{') !== false) {
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$name = preg_replace('/\\{\\{(.*?)\\}\\}/', '\1', $name);
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return str_replace('%', $this->db->tablePrefix, $name);
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} else {
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return $name;
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}
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}
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/**
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* Extracts the PHP type from abstract DB type.
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* @param ColumnSchema $column the column schema information
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* @return string PHP type name
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*/
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protected function getColumnPhpType($column)
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{
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static $typeMap = array( // abstract type => php type
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'smallint' => 'integer',
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'integer' => 'integer',
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'bigint' => 'integer',
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'boolean' => 'boolean',
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'float' => 'double',
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);
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if (isset($typeMap[$column->type])) {
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if ($column->type === 'bigint') {
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return PHP_INT_SIZE == 8 && !$column->unsigned ? 'integer' : 'string';
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} elseif ($column->type === 'integer') {
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return PHP_INT_SIZE == 4 && $column->unsigned ? 'string' : 'integer';
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} else {
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return $typeMap[$column->type];
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}
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} else {
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return 'string';
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}
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}
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}
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