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67 lines
2.5 KiB
C++
67 lines
2.5 KiB
C++
#pragma once
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#include <Storages/IStorage_fwd.h>
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#include <Databases/IDatabase.h>
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namespace DB
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{
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/**
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* Implements the IDatabase interface and combines multiple other databases
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* Searches for tables in each database in order until found, and delegates operations to the appropriate database
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* Useful for combining databases
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*
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* Used in clickhouse-local to combine DatabaseFileSystem and DatabaseMemory
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*/
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class DatabasesOverlay : public IDatabase, protected WithContext
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{
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public:
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DatabasesOverlay(const String & name_, ContextPtr context_);
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/// Not thread-safe. Use only as factory to initialize database
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DatabasesOverlay & registerNextDatabase(DatabasePtr database);
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String getEngineName() const override { return "Overlay"; }
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public:
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bool isTableExist(const String & table_name, ContextPtr context) const override;
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StoragePtr tryGetTable(const String & table_name, ContextPtr context) const override;
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void createTable(ContextPtr context, const String & table_name, const StoragePtr & table, const ASTPtr & query) override;
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void dropTable(ContextPtr context, const String & table_name, bool sync) override;
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void attachTable(ContextPtr context, const String & table_name, const StoragePtr & table, const String & relative_table_path) override;
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StoragePtr detachTable(ContextPtr context, const String & table_name) override;
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ASTPtr getCreateTableQueryImpl(const String & name, ContextPtr context, bool throw_on_error) const override;
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ASTPtr getCreateDatabaseQuery() const override;
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String getTableDataPath(const String & table_name) const override;
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String getTableDataPath(const ASTCreateQuery & query) const override;
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UUID tryGetTableUUID(const String & table_name) const override;
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void drop(ContextPtr context) override;
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void alterTable(ContextPtr local_context, const StorageID & table_id, const StorageInMemoryMetadata & metadata) override;
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std::vector<std::pair<ASTPtr, StoragePtr>> getTablesForBackup(const FilterByNameFunction & filter, const ContextPtr & local_context) const override;
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void createTableRestoredFromBackup(const ASTPtr & create_table_query, ContextMutablePtr local_context, std::shared_ptr<IRestoreCoordination> restore_coordination, UInt64 timeout_ms) override;
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DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) const override;
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bool empty() const override;
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void shutdown() override;
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protected:
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std::vector<DatabasePtr> databases;
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Poco::Logger * log;
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};
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}
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