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72 lines
1.8 KiB
C++
72 lines
1.8 KiB
C++
#pragma once
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#include <DB/Dictionaries/IDictionarySource.h>
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#include <DB/Dictionaries/DictionaryStructure.h>
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namespace Poco
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{
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namespace Util
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{
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class AbstractConfiguration;
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}
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namespace MongoDB
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{
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class Connection;
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}
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}
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namespace DB
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{
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/// Allows loading dictionaries from a MongoDB collection
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class MongoDBDictionarySource final : public IDictionarySource
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{
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MongoDBDictionarySource(
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const DictionaryStructure & dict_struct, const std::string & host, UInt16 port,
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const std::string & user, const std::string & password,
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const std::string & db, const std::string & collection,
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const Block & sample_block);
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public:
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MongoDBDictionarySource(
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const DictionaryStructure & dict_struct, const Poco::Util::AbstractConfiguration & config,
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const std::string & config_prefix, Block & sample_block);
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MongoDBDictionarySource(const MongoDBDictionarySource & other);
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~MongoDBDictionarySource() override;
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BlockInputStreamPtr loadAll() override;
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bool supportsSelectiveLoad() const override { return true; }
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BlockInputStreamPtr loadIds(const std::vector<UInt64> & ids) override;
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BlockInputStreamPtr loadKeys(
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const ConstColumnPlainPtrs & key_columns, const std::vector<std::size_t> & requested_rows) override;
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/// @todo: for MongoDB, modification date can somehow be determined from the `_id` object field
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bool isModified() const override { return true; }
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DictionarySourcePtr clone() const override { return std::make_unique<MongoDBDictionarySource>(*this); }
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std::string toString() const override;
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private:
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const DictionaryStructure dict_struct;
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const std::string host;
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const UInt16 port;
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const std::string user;
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const std::string password;
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const std::string db;
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const std::string collection;
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Block sample_block;
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std::shared_ptr<Poco::MongoDB::Connection> connection;
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};
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}
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