ClickHouse/dbms/include/DB/Interpreters/Context.h

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#pragma once
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#include <functional>
#include <memory>
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#include <DB/Core/Types.h>
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#include <DB/Core/NamesAndTypes.h>
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#include <DB/Interpreters/Settings.h>
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#include <DB/Storages/IStorage.h>
#include <DB/IO/CompressedStream.h>
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#include <Poco/Net/IPAddress.h>
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namespace zkutil
{
class ZooKeeper;
}
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namespace DB
{
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struct ContextShared;
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class QuotaForIntervals;
class TableFunctionFactory;
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class AggregateFunctionFactory;
class Dictionaries;
class ExternalDictionaries;
class InterserverIOHandler;
class BackgroundProcessingPool;
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class ReshardingWorker;
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class MergeList;
class Cluster;
class Compiler;
class MarkCache;
class UncompressedCache;
class ProcessList;
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struct ProcessListElement;
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class Macros;
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struct Progress;
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class Clusters;
class QueryLog;
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struct MergeTreeSettings;
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class IDatabase;
class DDLGuard;
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/// (имя базы данных, имя таблицы)
using DatabaseAndTableName = std::pair<String, String>;
/// Таблица -> множество таблиц-представлений, которые деляют SELECT из неё.
using ViewDependencies = std::map<DatabaseAndTableName, std::set<DatabaseAndTableName>>;
using Dependencies = std::vector<DatabaseAndTableName>;
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/** Набор известных объектов, которые могут быть использованы в запросе.
* Состоит из разделяемой части (всегда общей для всех сессий и запросов)
* и копируемой части (которая может быть своей для каждой сессии или запроса).
*
* Всё инкапсулировано для всяких проверок и блокировок.
*/
class Context
{
public:
enum class Interface
{
TCP = 1,
HTTP = 2,
OLAP_HTTP = 3,
};
enum class HTTPMethod
{
UNKNOWN = 0,
GET = 1,
POST = 2,
};
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private:
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using Shared = std::shared_ptr<ContextShared>;
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Shared shared;
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String user; /// Текущий пользователь.
Poco::Net::IPAddress ip_address; /// IP-адрес, с которого задан запрос.
Interface interface = Interface::TCP;
HTTPMethod http_method = HTTPMethod::UNKNOWN; /// NOTE Возможно, перенести это в отдельный struct ClientInfo.
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std::shared_ptr<QuotaForIntervals> quota; /// Текущая квота. По-умолчанию - пустая квота, которая ничего не ограничивает.
String current_database; /// Текущая БД.
String current_query_id; /// Id текущего запроса.
Settings settings; /// Настройки выполнения запроса.
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using ProgressCallback = std::function<void(const Progress & progress)>;
ProgressCallback progress_callback; /// Колбек для отслеживания прогресса выполнения запроса.
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ProcessListElement * process_list_elem = nullptr; /// Для отслеживания общего количества потраченных на запрос ресурсов.
String default_format; /// Формат, используемый, если сервер сам форматирует данные, и если в запросе не задан FORMAT.
/// То есть, используется в HTTP-интерфейсе. Может быть не задан - тогда используется некоторый глобальный формат по-умолчанию.
Tables external_tables; /// Временные таблицы.
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Context * session_context = nullptr; /// Контекст сессии или nullptr, если его нет. (Возможно, равен this.)
Context * global_context = nullptr; /// Глобальный контекст или nullptr, если его нет. (Возможно, равен this.)
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using DatabasePtr = std::shared_ptr<IDatabase>;
using Databases = std::map<String, std::shared_ptr<IDatabase>>;
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public:
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Context();
~Context();
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String getPath() const;
String getTemporaryPath() const;
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void setPath(const String & path);
void setTemporaryPath(const String & path);
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using ConfigurationPtr = Poco::AutoPtr<Poco::Util::AbstractConfiguration>;
/** Забрать список пользователей, квот и профилей настроек из этого конфига.
* Список пользователей полностью заменяется.
* Накопленные значения у квоты не сбрасываются, если квота не удалена.
*/
void setUsersConfig(ConfigurationPtr config);
ConfigurationPtr getUsersConfig();
void setUser(const String & name, const String & password, const Poco::Net::IPAddress & address, const String & quota_key);
String getUser() const { return user; }
Poco::Net::IPAddress getIPAddress() const { return ip_address; }
Interface getInterface() const { return interface; }
void setInterface(Interface interface_) { interface = interface_; }
HTTPMethod getHTTPMethod() const { return http_method; }
void setHTTPMethod(HTTPMethod http_method_) { http_method = http_method_; }
void setQuota(const String & name, const String & quota_key, const String & user_name, const Poco::Net::IPAddress & address);
QuotaForIntervals & getQuota();
void addDependency(const DatabaseAndTableName & from, const DatabaseAndTableName & where);
void removeDependency(const DatabaseAndTableName & from, const DatabaseAndTableName & where);
Dependencies getDependencies(const String & database_name, const String & table_name) const;
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/// Проверка существования таблицы/БД. database может быть пустой - в этом случае используется текущая БД.
bool isTableExist(const String & database_name, const String & table_name) const;
bool isDatabaseExist(const String & database_name) const;
void assertTableExists(const String & database_name, const String & table_name) const;
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/** Параметр check_database_access_rights существует, чтобы не проверить повторно права доступа к БД,
* когда assertTableDoesnExist или assertDatabaseExists вызывается внутри другой функции, которая уже
* сделала эту проверку.
*/
void assertTableDoesntExist(const String & database_name, const String & table_name, bool check_database_acccess_rights = true) const;
void assertDatabaseExists(const String & database_name, bool check_database_acccess_rights = true) const;
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void assertDatabaseDoesntExist(const String & database_name) const;
Tables getExternalTables() const;
StoragePtr tryGetExternalTable(const String & table_name) const;
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StoragePtr getTable(const String & database_name, const String & table_name) const;
StoragePtr tryGetTable(const String & database_name, const String & table_name) const;
void addExternalTable(const String & table_name, StoragePtr storage);
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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void addDatabase(const String & database_name, const DatabasePtr & database);
DatabasePtr detachDatabase(const String & database_name);
/// Получить объект, который защищает таблицу от одновременного выполнения нескольких DDL операций.
/// Если такой объект уже есть - кидается исключение.
std::unique_ptr<DDLGuard> getDDLGuard(const String & database, const String & table, const String & message) const;
/// Если таблица уже есть - возвращается nullptr, иначе создаётся guard.
std::unique_ptr<DDLGuard> getDDLGuardIfTableDoesntExist(const String & database, const String & table, const String & message) const;
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String getCurrentDatabase() const;
String getCurrentQueryId() const;
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void setCurrentDatabase(const String & name);
void setCurrentQueryId(const String & query_id);
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String getDefaultFormat() const; /// Если default_format не задан - возвращается некоторый глобальный формат по-умолчанию.
void setDefaultFormat(const String & name);
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const Macros & getMacros() const;
void setMacros(Macros && macros);
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Settings getSettings() const;
void setSettings(const Settings & settings_);
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Limits getLimits() const;
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/// Установить настройку по имени.
void setSetting(const String & name, const Field & value);
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/// Установить настройку по имени. Прочитать значение в текстовом виде из строки (например, из конфига, или из параметра URL).
void setSetting(const String & name, const std::string & value);
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const TableFunctionFactory & getTableFunctionFactory() const;
const AggregateFunctionFactory & getAggregateFunctionFactory() const;
const Dictionaries & getDictionaries() const;
const ExternalDictionaries & getExternalDictionaries() const;
void tryCreateDictionaries() const;
void tryCreateExternalDictionaries() const;
/// Форматы ввода-вывода.
BlockInputStreamPtr getInputFormat(const String & name, ReadBuffer & buf, const Block & sample, size_t max_block_size) const;
BlockOutputStreamPtr getOutputFormat(const String & name, WriteBuffer & buf, const Block & sample) const;
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InterserverIOHandler & getInterserverIOHandler();
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/// Как другие серверы могут обратиться к этому для скачивания реплицируемых данных.
void setInterserverIOAddress(const String & host, UInt16 port);
std::pair<String, UInt16> getInterserverIOAddress() const;
/// Порт, который сервер слушает для выполнения SQL-запросов.
UInt16 getTCPPort() const;
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/// Получить запрос на CREATE таблицы.
ASTPtr getCreateQuery(const String & database_name, const String & table_name) const;
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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const DatabasePtr getDatabase(const String & database_name) const;
DatabasePtr getDatabase(const String & database_name);
const DatabasePtr tryGetDatabase(const String & database_name) const;
DatabasePtr tryGetDatabase(const String & database_name);
const Databases getDatabases() const;
Databases getDatabases();
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/// Для методов ниже может быть необходимо захватывать блокировку самостоятельно.
std::unique_lock<Poco::Mutex> getLock() const;
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Context & getSessionContext();
Context & getGlobalContext();
void setSessionContext(Context & context_) { session_context = &context_; }
void setGlobalContext(Context & context_) { global_context = &context_; }
const Settings & getSettingsRef() const { return settings; };
Settings & getSettingsRef() { return settings; };
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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void setProgressCallback(ProgressCallback callback);
/// Используется в InterpreterSelectQuery, чтобы передать его в IProfilingBlockInputStream.
ProgressCallback getProgressCallback() const;
/** Устанавливается в executeQuery и InterpreterSelectQuery. Затем используется в IProfilingBlockInputStream,
* чтобы обновлять и контролировать информацию об общем количестве потраченных на запрос ресурсов.
*/
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void setProcessListElement(ProcessListElement * elem);
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/// Может вернуть nullptr, если запрос не был вставлен в ProcessList.
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ProcessListElement * getProcessListElement();
/// Список всех запросов.
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ProcessList & getProcessList();
const ProcessList & getProcessList() const;
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MergeList & getMergeList();
const MergeList & getMergeList() const;
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/// Создать кэш разжатых блоков указанного размера. Это можно сделать только один раз.
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void setUncompressedCache(size_t max_size_in_bytes);
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std::shared_ptr<UncompressedCache> getUncompressedCache() const;
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void setZooKeeper(std::shared_ptr<zkutil::ZooKeeper> zookeeper);
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/// Если в момент вызова текущая сессия просрочена, синхронно создает и возвращает новую вызовом startNewSession().
std::shared_ptr<zkutil::ZooKeeper> getZooKeeper() const;
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/// Создать кэш засечек указанного размера. Это можно сделать только один раз.
void setMarkCache(size_t cache_size_in_bytes);
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std::shared_ptr<MarkCache> getMarkCache() const;
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BackgroundProcessingPool & getBackgroundPool();
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void setReshardingWorker(std::shared_ptr<ReshardingWorker> resharding_worker);
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ReshardingWorker & getReshardingWorker();
/** Очистить кэши разжатых блоков и засечек.
* Обычно это делается при переименовании таблиц, изменении типа столбцов, удалении таблицы.
* - так как кэши привязаны к именам файлов, и становятся некорректными.
* (при удалении таблицы - нужно, так как на её месте может появиться другая)
* const - потому что изменение кэша не считается существенным.
*/
void resetCaches() const;
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const Cluster & getCluster(const std::string & cluster_name) const;
std::shared_ptr<Clusters> getClusters() const;
Compiler & getCompiler();
QueryLog & getQueryLog();
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const MergeTreeSettings & getMergeTreeSettings();
/// Позволяет выбрать метод сжатия по условиям, описанным в конфигурационном файле.
CompressionMethod chooseCompressionMethod(size_t part_size, double part_size_ratio) const;
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/// Получить аптайм сервера в секундах.
time_t getUptimeSeconds() const;
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void shutdown();
private:
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/** Проверить, имеет ли текущий клиент доступ к заданной базе данных.
* Если доступ запрещён, кинуть исключение.
* NOTE: Этот метод надо всегда вызывать при захваченном мьютексе shared->mutex.
*/
void checkDatabaseAccessRights(const std::string & database_name) const;
const Dictionaries & getDictionariesImpl(bool throw_on_error) const;
const ExternalDictionaries & getExternalDictionariesImpl(bool throw_on_error) const;
StoragePtr getTableImpl(const String & database_name, const String & table_name, Exception * exception) const;
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};
/** Кладёт элемент в map, в деструкторе - удаляет.
* Если элемент уже есть - кидает исключение.
*/
class DDLGuard
{
/// Имя объекта -> сообщение.
using Map = std::unordered_map<String, String>;
Map & map;
Map::iterator it;
std::mutex & mutex;
public:
DDLGuard(Map & map_, std::mutex & mutex_, std::unique_lock<std::mutex> && lock, const String & elem, const String & message);
~DDLGuard();
};
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}