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108 lines
4.0 KiB
C++
108 lines
4.0 KiB
C++
#pragma once
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#include <Common/escapeForFileName.h>
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#include <Common/quoteString.h>
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#include <Databases/DatabasesCommon.h>
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#include <Parsers/ASTCreateQuery.h>
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#include <Storages/IStorage.h>
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namespace DB
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{
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class Context;
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std::pair<String, StoragePtr> createTableFromAST(
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ASTCreateQuery ast_create_query,
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const String & database_name,
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const String & table_data_path_relative,
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ContextMutablePtr context,
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bool force_restore);
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/** Get the string with the table definition based on the CREATE query.
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* It is an ATTACH query that you can execute to create a table from the correspondent database.
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* See the implementation.
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*/
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String getObjectDefinitionFromCreateQuery(const ASTPtr & query);
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void applyMetadataChangesToCreateQuery(const ASTPtr & query, const StorageInMemoryMetadata & metadata);
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/* Class to provide basic operations with tables when metadata is stored on disk in .sql files.
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*/
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class DatabaseOnDisk : public DatabaseWithOwnTablesBase
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{
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public:
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DatabaseOnDisk(const String & name, const String & metadata_path_, const String & data_path_, const String & logger, ContextPtr context);
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void createTable(
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ContextPtr context,
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const String & table_name,
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const StoragePtr & table,
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const ASTPtr & query) override;
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void detachTablePermanently(ContextPtr context, const String & table_name) override;
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void dropTable(
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ContextPtr context,
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const String & table_name,
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bool no_delay) override;
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void renameTable(
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ContextPtr context,
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const String & table_name,
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IDatabase & to_database,
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const String & to_table_name,
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bool exchange,
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bool dictionary) override;
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ASTPtr getCreateDatabaseQuery() const override;
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void drop(ContextPtr context) override;
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String getObjectMetadataPath(const String & object_name) const override;
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time_t getObjectMetadataModificationTime(const String & object_name) const override;
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String getDataPath() const override { return data_path; }
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String getTableDataPath(const String & table_name) const override { return data_path + escapeForFileName(table_name) + "/"; }
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String getTableDataPath(const ASTCreateQuery & query) const override { return getTableDataPath(query.table); }
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String getMetadataPath() const override { return metadata_path; }
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static ASTPtr parseQueryFromMetadata(Poco::Logger * log, ContextPtr context, const String & metadata_file_path, bool throw_on_error = true, bool remove_empty = false);
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/// will throw when the table we want to attach already exists (in active / detached / detached permanently form)
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void checkMetadataFilenameAvailability(const String & to_table_name) const;
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void checkMetadataFilenameAvailabilityUnlocked(const String & to_table_name, std::unique_lock<std::mutex> &) const;
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void modifySettingsMetadata(const SettingsChanges & settings_changes, ContextPtr query_context);
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protected:
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static constexpr const char * create_suffix = ".tmp";
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static constexpr const char * drop_suffix = ".tmp_drop";
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static constexpr const char * detached_suffix = ".detached";
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using IteratingFunction = std::function<void(const String &)>;
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void iterateMetadataFiles(ContextPtr context, const IteratingFunction & process_metadata_file) const;
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ASTPtr getCreateTableQueryImpl(
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const String & table_name,
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ContextPtr context,
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bool throw_on_error) const override;
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ASTPtr getCreateQueryFromMetadata(const String & metadata_path, bool throw_on_error) const;
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virtual void commitCreateTable(const ASTCreateQuery & query, const StoragePtr & table,
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const String & table_metadata_tmp_path, const String & table_metadata_path, ContextPtr query_context);
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virtual void removeDetachedPermanentlyFlag(ContextPtr context, const String & table_name, const String & table_metadata_path, bool attach) const;
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const String metadata_path;
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const String data_path;
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/// For alter settings.
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std::mutex modify_settings_mutex;
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};
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}
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