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https://github.com/ClickHouse/ClickHouse.git
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53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
#pragma once
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#include <Databases/DatabasesCommon.h>
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#include <Common/escapeForFileName.h>
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#include <Parsers/ASTCreateQuery.h>
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namespace Poco { class Logger; }
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namespace DB
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{
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/** A non-persistent database to store temporary data.
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* It doesn't make any manipulations with filesystem.
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* All tables are created by calling code.
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* TODO: Maybe DatabaseRuntime is more suitable class name.
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*/
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class DatabaseMemory final : public DatabaseWithOwnTablesBase
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{
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public:
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DatabaseMemory(const String & name_);
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String getEngineName() const override { return "Memory"; }
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void createTable(
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const Context & 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 removeTable(
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const Context & context,
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const String & table_name) override;
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ASTPtr getCreateTableQueryImpl(const Context & /*context*/, const String & name, bool throw_on_error) const override;
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ASTPtr getCreateDatabaseQuery(const Context & /*context*/) const override;
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/// DatabaseMemory allows to create tables, which store data on disk.
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/// It's needed to create such tables in default database of clickhouse-local.
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/// TODO May be it's better to use DiskMemory for such tables.
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/// To save data on disk it's possible to explicitly CREATE DATABASE db ENGINE=Ordinary in clickhouse-local.
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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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private:
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String data_path;
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using NameToASTCreate = std::unordered_map<String, ASTPtr>;
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NameToASTCreate create_queries;
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};
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}
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