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100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
#pragma once
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#include "config_core.h"
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#if USE_MYSQL
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#include <mysqlxx/Pool.h>
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#include <Databases/DatabasesCommon.h>
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#include <Interpreters/Context.h>
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#include <memory>
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#include <Parsers/ASTCreateQuery.h>
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namespace DB
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{
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/** Real-time access to table list and table structure from remote MySQL
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* It doesn't make any manipulations with filesystem.
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* All tables are created by calling code after real-time pull-out structure from remote MySQL
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*/
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class DatabaseMySQL final : public IDatabase
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{
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public:
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~DatabaseMySQL() override;
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DatabaseMySQL(
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const Context & global_context, const String & database_name, const String & metadata_path,
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const ASTStorage * database_engine_define, const String & database_name_in_mysql, mysqlxx::Pool && pool);
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String getEngineName() const override { return "MySQL"; }
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bool empty(const Context & context) const override;
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DatabaseTablesIteratorPtr getTablesIterator(const Context & context, const FilterByNameFunction & filter_by_table_name) override;
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ASTPtr getCreateDatabaseQuery(const Context & /*context*/) const override;
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bool isTableExist(const Context & context, const String & name) const override;
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StoragePtr tryGetTable(const Context & context, const String & name) const override;
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time_t getObjectMetadataModificationTime(const String & name) const override;
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void shutdown() override;
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void drop(const Context & /*context*/) override;
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String getMetadataPath() const override;
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void createTable(const Context &, const String & table_name, const StoragePtr & storage, const ASTPtr & create_query) override;
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void loadStoredObjects(Context &, bool) override;
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StoragePtr detachTable(const String & table_name) override;
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void removeTable(const Context &, const String & table_name) override;
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void attachTable(const String & table_name, const StoragePtr & storage) override;
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protected:
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ASTPtr getCreateTableQueryImpl(const Context & context, const String & name, bool throw_on_error) const override;
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private:
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Context global_context;
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String metadata_path;
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ASTPtr database_engine_define;
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String database_name_in_mysql;
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mutable std::mutex mutex;
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std::atomic<bool> quit{false};
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std::condition_variable cond;
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using MySQLPool = mysqlxx::Pool;
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using ModifyTimeAndStorage = std::pair<UInt64, StoragePtr>;
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mutable MySQLPool mysql_pool;
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mutable std::vector<StoragePtr> outdated_tables;
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mutable std::map<String, ModifyTimeAndStorage> local_tables_cache;
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std::unordered_set<String> remove_or_detach_tables;
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void cleanOutdatedTables();
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void fetchTablesIntoLocalCache() const;
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std::map<String, UInt64> fetchTablesWithModificationTime() const;
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std::map<String, NamesAndTypesList> fetchTablesColumnsList(const std::vector<String> & tables_name) const;
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void destroyLocalCacheExtraTables(const std::map<String, UInt64> & tables_with_modification_time) const;
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void fetchLatestTablesStructureIntoCache(const std::map<String, UInt64> & tables_modification_time) const;
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ThreadFromGlobalPool thread{&DatabaseMySQL::cleanOutdatedTables, this};
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};
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}
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#endif
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