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ed5b521110
* Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2]. * Less dependencies [#CLICKHOUSE-2].
69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
#pragma once
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#include <mutex>
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#include <DB/Databases/IDatabase.h>
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#include <DB/Storages/IStorage.h>
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namespace Poco { class Logger; }
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namespace DB
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{
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/** A non-persistent database to store temporary data.
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* It doesn't make any manipulations with filesystem.
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* All tables are created by calling code.
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* TODO: Maybe DatabaseRuntime is more suitable class name.
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*/
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class DatabaseMemory : public IDatabase
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{
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protected:
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const String name;
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mutable std::mutex mutex;
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Tables tables;
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Poco::Logger * log;
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public:
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DatabaseMemory(const String & name_) : name(name_) {}
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String getEngineName() const override { return "Memory"; }
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void loadTables(Context & context, ThreadPool * thread_pool, bool has_force_restore_data_flag) override;
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bool isTableExist(const String & table_name) const override;
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StoragePtr tryGetTable(const String & table_name) override;
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DatabaseIteratorPtr getIterator() override;
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bool empty() const override;
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void createTable(const String & table_name, const StoragePtr & table, const ASTPtr & query, const String & engine) override;
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void removeTable(const String & table_name) override;
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void attachTable(const String & table_name, const StoragePtr & table) override;
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StoragePtr detachTable(const String & table_name) override;
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void renameTable(const Context & context, const String & table_name, IDatabase & to_database, const String & to_table_name) override;
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time_t getTableMetadataModificationTime(const String & table_name) override;
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ASTPtr getCreateQuery(const String & table_name) const override;
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void shutdown() override;
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void drop() override;
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void alterTable(
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const Context & context,
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const String & name,
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const NamesAndTypesList & columns,
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const NamesAndTypesList & materialized_columns,
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const NamesAndTypesList & alias_columns,
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const ColumnDefaults & column_defaults,
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const ASTModifier & engine_modifier) override;
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};
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}
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