ClickHouse/dbms/include/DB/Databases/IDatabase.h

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#pragma once
#include <DB/Core/Types.h>
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#include <DB/Core/NamesAndTypes.h>
#include <DB/Storages/ColumnDefault.h>
#include <ctime>
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#include <memory>
#include <functional>
class ThreadPool;
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namespace DB
{
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class Context;
class IStorage;
using StoragePtr = std::shared_ptr<IStorage>;
class IAST;
using ASTPtr = std::shared_ptr<IAST>;
struct Settings;
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/** Allows to iterate over tables.
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*/
class IDatabaseIterator
{
public:
virtual void next() = 0;
virtual bool isValid() const = 0;
virtual const String & name() const = 0;
virtual StoragePtr & table() const = 0;
virtual ~IDatabaseIterator() {}
};
using DatabaseIteratorPtr = std::unique_ptr<IDatabaseIterator>;
/** Database engine.
* It is responsible for:
* - initialization of set of known tables;
* - checking existence of a table and getting a table object;
* - retrieving a list of all tables;
* - creating and dropping tables;
* - renaming tables and moving between databases with same engine.
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*/
class IDatabase : public std::enable_shared_from_this<IDatabase>
{
public:
/// Get name of database engine.
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virtual String getEngineName() const = 0;
/// Загрузить множество существующих таблиц. Если задан thread_pool - использовать его.
/// Можно вызывать только один раз, сразу после создания объекта.
virtual void loadTables(Context & context, ThreadPool * thread_pool, bool has_force_restore_data_flag) = 0;
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2016-03-19 01:18:49 +00:00
/// Проверить существование таблицы.
virtual bool isTableExist(const String & name) const = 0;
/// Получить таблицу для работы. Вернуть nullptr, если таблицы нет.
virtual StoragePtr tryGetTable(const String & name) = 0;
/// Получить итератор, позволяющий перебрать все таблицы.
/// Допустимо наличие "скрытых" таблиц, которые не видны при переборе, но видны, если получать их по имени, используя функции выше.
virtual DatabaseIteratorPtr getIterator() = 0;
/// Является ли БД пустой.
virtual bool empty() const = 0;
/// Добавить таблицу в базу данных. Прописать её наличие в метаданных.
virtual void createTable(
const String & name, const StoragePtr & table, const ASTPtr & query, const String & engine, const Settings & settings) = 0;
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/// Удалить таблицу из базы данных и вернуть её. Удалить метаданные.
virtual void removeTable(const String & name) = 0;
Squashed commit of the following: commit f9b478181cd49224154cc350fb57df7121842f1c Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 04:06:36 2016 +0300 Database engines: development [#METR-19997]. commit f7a10a67761ccfd05f3dac32d6444920cd8d4d60 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 03:44:37 2016 +0300 Database engines: development [#METR-19997]. commit bd98a8558e98bad2bed278e5762c4e0fc66e6f38 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:33:59 2016 +0300 Database engines: development [#METR-19997]. commit 19712fd884c22a4e2c2b67474086dea8f44e7c7b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:03:11 2016 +0300 Database engines: development [#METR-19997]. commit 50274d6df7e91fcc34aab8a8c72347daa2c6512f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 23:24:57 2016 +0300 Database engines: development [#METR-19997]. commit 4a0b99b19b34e90ef8b7be2d199f6232e36ef3f7 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 22:50:36 2016 +0300 Database engines: development [#METR-19997]. commit 44ff3ebba7a3e460a27a89f31ddf199dbea1d182 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 15:09:17 2016 +0300 Database engines: development [#METR-19997]. commit 137c31f3004cfd282473b6acb01cbe1b4ca2aadd Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:26:34 2016 +0300 Database engines: development [#METR-19997]. commit aa4c0496d4afe4a691164254be2bd5600542b38a Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:22:59 2016 +0300 Database engines: development [#METR-19997]. commit 5a94d1f0607450a2dac28a4d7df8b1393a864c23 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 01:02:40 2016 +0300 Database engines: development [#METR-19997]. commit 50fd5b52ea1141955a5dfba0dcb191f3289ac25b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 23:23:40 2016 +0300 Database engines: development [#METR-19997]. commit a333d91b058e4f56dd83a6d2878c3c2bd8efc002 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 20:29:07 2016 +0300 Database engines: development [#METR-19997]. commit f81d366e7ac8348436f2698d040f8e341743a024 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 01:30:23 2016 +0300 Database engines: development [#METR-19997]. commit d0696860c9060827896214c08d147c759ea79376 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 21:55:31 2016 +0300 Database engines: development [#METR-19997]. commit 46a168c2ada140a0e95cd8d4b9d8ba9bac855d11 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 08:00:58 2016 +0300 Database engines: development [#METR-19997]. commit 20a2bad161454225fc1b5f9b919b842fbebc3231 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:51:10 2016 +0300 Database engines: development [#METR-19997]. commit ca0a77fcc2a8d0b276eb3743c53551ad3fe16314 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:02:20 2016 +0300 Reverted erroneous modification [#METR-19997]. commit 1370bdcc4594182f6ef2b146f9afabfe1c295080 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 00:41:34 2016 +0300 Database engines: development [#METR-19997]. commit 16e72c67041cae6471509d3f0f3d4a9aa7b7dc0f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Tue Mar 15 00:41:48 2016 +0300 Database engines: development [#METR-19997].
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/// Добавить таблицу в базу данных, но не прописывать её в метаданных. БД может не поддерживать этот метод.
virtual void attachTable(const String & name, const StoragePtr & table) = 0;
/// Забыть про таблицу, не удаляя её, и вернуть её. БД может не поддерживать этот метод.
virtual StoragePtr detachTable(const String & name) = 0;
/// Переименовать таблицу и, возможно, переместить таблицу в другую БД.
virtual void renameTable(
const Context & context, const String & name, IDatabase & to_database, const String & to_name, const Settings & settings) = 0;
Squashed commit of the following: commit f9b478181cd49224154cc350fb57df7121842f1c Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 04:06:36 2016 +0300 Database engines: development [#METR-19997]. commit f7a10a67761ccfd05f3dac32d6444920cd8d4d60 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 03:44:37 2016 +0300 Database engines: development [#METR-19997]. commit bd98a8558e98bad2bed278e5762c4e0fc66e6f38 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:33:59 2016 +0300 Database engines: development [#METR-19997]. commit 19712fd884c22a4e2c2b67474086dea8f44e7c7b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:03:11 2016 +0300 Database engines: development [#METR-19997]. commit 50274d6df7e91fcc34aab8a8c72347daa2c6512f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 23:24:57 2016 +0300 Database engines: development [#METR-19997]. commit 4a0b99b19b34e90ef8b7be2d199f6232e36ef3f7 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 22:50:36 2016 +0300 Database engines: development [#METR-19997]. commit 44ff3ebba7a3e460a27a89f31ddf199dbea1d182 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 15:09:17 2016 +0300 Database engines: development [#METR-19997]. commit 137c31f3004cfd282473b6acb01cbe1b4ca2aadd Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:26:34 2016 +0300 Database engines: development [#METR-19997]. commit aa4c0496d4afe4a691164254be2bd5600542b38a Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:22:59 2016 +0300 Database engines: development [#METR-19997]. commit 5a94d1f0607450a2dac28a4d7df8b1393a864c23 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 01:02:40 2016 +0300 Database engines: development [#METR-19997]. commit 50fd5b52ea1141955a5dfba0dcb191f3289ac25b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 23:23:40 2016 +0300 Database engines: development [#METR-19997]. commit a333d91b058e4f56dd83a6d2878c3c2bd8efc002 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 20:29:07 2016 +0300 Database engines: development [#METR-19997]. commit f81d366e7ac8348436f2698d040f8e341743a024 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 01:30:23 2016 +0300 Database engines: development [#METR-19997]. commit d0696860c9060827896214c08d147c759ea79376 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 21:55:31 2016 +0300 Database engines: development [#METR-19997]. commit 46a168c2ada140a0e95cd8d4b9d8ba9bac855d11 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 08:00:58 2016 +0300 Database engines: development [#METR-19997]. commit 20a2bad161454225fc1b5f9b919b842fbebc3231 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:51:10 2016 +0300 Database engines: development [#METR-19997]. commit ca0a77fcc2a8d0b276eb3743c53551ad3fe16314 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:02:20 2016 +0300 Reverted erroneous modification [#METR-19997]. commit 1370bdcc4594182f6ef2b146f9afabfe1c295080 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 00:41:34 2016 +0300 Database engines: development [#METR-19997]. commit 16e72c67041cae6471509d3f0f3d4a9aa7b7dc0f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Tue Mar 15 00:41:48 2016 +0300 Database engines: development [#METR-19997].
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/// Returns time of table's metadata change, 0 if there is no corresponding metadata file.
virtual time_t getTableMetadataModificationTime(const String & name) = 0;
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using ASTModifier = std::function<void(ASTPtr &)>;
/// Изменить структуру таблицы в метаданных.
/// Нужно вызывать под TableStructureLock соответствующей таблицы. Если engine_modifier пустой, то engine не изменяется.
virtual void alterTable(
const Context & context,
const String & name,
const NamesAndTypesList & columns,
const NamesAndTypesList & materialized_columns,
const NamesAndTypesList & alias_columns,
const ColumnDefaults & column_defaults,
const ASTModifier & engine_modifier) = 0;
2016-05-13 21:08:19 +00:00
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/// Получить запрос CREATE TABLE для таблицы. Может выдавать информацию и для detached таблиц, для которых есть метаданные.
virtual ASTPtr getCreateQuery(const String & name) const = 0;
/// Попросить все таблицы завершить фоновые потоки, которые они используют, и удалить все объекты таблиц.
virtual void shutdown() = 0;
/// Удалить метаданные, удаление которых отличается от рекурсивного удаления директории, если такие есть.
virtual void drop() = 0;
Squashed commit of the following: commit f9b478181cd49224154cc350fb57df7121842f1c Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 04:06:36 2016 +0300 Database engines: development [#METR-19997]. commit f7a10a67761ccfd05f3dac32d6444920cd8d4d60 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 03:44:37 2016 +0300 Database engines: development [#METR-19997]. commit bd98a8558e98bad2bed278e5762c4e0fc66e6f38 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:33:59 2016 +0300 Database engines: development [#METR-19997]. commit 19712fd884c22a4e2c2b67474086dea8f44e7c7b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:03:11 2016 +0300 Database engines: development [#METR-19997]. commit 50274d6df7e91fcc34aab8a8c72347daa2c6512f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 23:24:57 2016 +0300 Database engines: development [#METR-19997]. commit 4a0b99b19b34e90ef8b7be2d199f6232e36ef3f7 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 22:50:36 2016 +0300 Database engines: development [#METR-19997]. commit 44ff3ebba7a3e460a27a89f31ddf199dbea1d182 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 15:09:17 2016 +0300 Database engines: development [#METR-19997]. commit 137c31f3004cfd282473b6acb01cbe1b4ca2aadd Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:26:34 2016 +0300 Database engines: development [#METR-19997]. commit aa4c0496d4afe4a691164254be2bd5600542b38a Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:22:59 2016 +0300 Database engines: development [#METR-19997]. commit 5a94d1f0607450a2dac28a4d7df8b1393a864c23 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 01:02:40 2016 +0300 Database engines: development [#METR-19997]. commit 50fd5b52ea1141955a5dfba0dcb191f3289ac25b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 23:23:40 2016 +0300 Database engines: development [#METR-19997]. commit a333d91b058e4f56dd83a6d2878c3c2bd8efc002 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 20:29:07 2016 +0300 Database engines: development [#METR-19997]. commit f81d366e7ac8348436f2698d040f8e341743a024 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 01:30:23 2016 +0300 Database engines: development [#METR-19997]. commit d0696860c9060827896214c08d147c759ea79376 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 21:55:31 2016 +0300 Database engines: development [#METR-19997]. commit 46a168c2ada140a0e95cd8d4b9d8ba9bac855d11 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 08:00:58 2016 +0300 Database engines: development [#METR-19997]. commit 20a2bad161454225fc1b5f9b919b842fbebc3231 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:51:10 2016 +0300 Database engines: development [#METR-19997]. commit ca0a77fcc2a8d0b276eb3743c53551ad3fe16314 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:02:20 2016 +0300 Reverted erroneous modification [#METR-19997]. commit 1370bdcc4594182f6ef2b146f9afabfe1c295080 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 00:41:34 2016 +0300 Database engines: development [#METR-19997]. commit 16e72c67041cae6471509d3f0f3d4a9aa7b7dc0f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Tue Mar 15 00:41:48 2016 +0300 Database engines: development [#METR-19997].
2016-03-19 01:18:49 +00:00
virtual ~IDatabase() {}
};
using DatabasePtr = std::shared_ptr<IDatabase>;
using Databases = std::map<String, DatabasePtr>;
}