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42 lines
900 B
C++
42 lines
900 B
C++
#pragma once
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#include <DB/Parsers/ASTUseQuery.h>
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#include <DB/Interpreters/Context.h>
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namespace DB
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{
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/** Выбрать БД по-умолчанию для сессии.
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*/
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class InterpreterUseQuery
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{
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public:
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InterpreterUseQuery(ASTPtr query_ptr_, Context & context_)
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: query_ptr(query_ptr_), context(context_) {}
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void execute()
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{
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const String & new_database = dynamic_cast<const ASTUseQuery &>(*query_ptr).database;
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{
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Poco::ScopedLock<Poco::Mutex> lock(*context.mutex);
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if (context.databases->end() == context.databases->find(new_database))
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throw Exception("Database " + new_database + " doesn't exist", ErrorCodes::UNKNOWN_DATABASE);
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}
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if (!context.session_context)
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throw Exception("There is no session", ErrorCodes::THERE_IS_NO_SESSION);
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context.session_context->current_database = new_database;
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}
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private:
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ASTPtr query_ptr;
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Context & context;
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};
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}
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