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28 lines
1.0 KiB
C++
28 lines
1.0 KiB
C++
#pragma once
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#include <Databases/IDatabase.h>
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namespace DB
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{
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template<typename StorageT, typename... StorageArgs>
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void attach(IDatabase & system_database, const String & table_name, StorageArgs && ... args)
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{
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if (system_database.getUUID() == UUIDHelpers::Nil)
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{
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/// Attach to Ordinary database
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auto table_id = StorageID(DatabaseCatalog::SYSTEM_DATABASE, table_name);
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system_database.attachTable(table_name, StorageT::create(table_id, std::forward<StorageArgs>(args)...));
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}
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else
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{
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/// Attach to Atomic database
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/// NOTE: UUIDs are not persistent, but it's ok since no data are stored on disk for these storages
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/// and path is actually not used
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auto table_id = StorageID(DatabaseCatalog::SYSTEM_DATABASE, table_name, UUIDHelpers::generateV4());
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String path = "store/" + DatabaseCatalog::getPathForUUID(table_id.uuid);
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system_database.attachTable(table_name, StorageT::create(table_id, std::forward<StorageArgs>(args)...), path);
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}
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}
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}
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