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52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
#pragma once
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#include <base/types.h>
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#include <Parsers/IAST.h>
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#include <Storages/IStorage_fwd.h>
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#include <Databases/IDatabase.h>
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#include <mutex>
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/// General functionality for several different database engines.
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namespace DB
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{
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void applyMetadataChangesToCreateQuery(const ASTPtr & query, const StorageInMemoryMetadata & metadata);
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ASTPtr getCreateQueryFromStorage(const StoragePtr & storage, const ASTPtr & ast_storage, bool only_ordinary, uint32_t max_parser_depth, bool throw_on_error);
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class Context;
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/// A base class for databases that manage their own list of tables.
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class DatabaseWithOwnTablesBase : public IDatabase, protected WithContext
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{
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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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bool empty() const 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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DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) const override;
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void shutdown() override;
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~DatabaseWithOwnTablesBase() override;
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protected:
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Tables tables;
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Poco::Logger * log;
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DatabaseWithOwnTablesBase(const String & name_, const String & logger, ContextPtr context);
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void attachTableUnlocked(const String & table_name, const StoragePtr & table, std::unique_lock<std::mutex> & lock);
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StoragePtr detachTableUnlocked(const String & table_name, std::unique_lock<std::mutex> & lock);
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StoragePtr getTableUnlocked(const String & table_name, std::unique_lock<std::mutex> & lock) const;
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};
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}
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