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60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
#pragma once
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#include <DB/Dictionaries/IDictionarySource.h>
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#include <DB/Dictionaries/ODBCBlockInputStream.h>
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#include <DB/Dictionaries/ExternalQueryBuilder.h>
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#include <ext/range.hpp>
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#include <mysqlxx/Pool.h>
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#include <Poco/Util/AbstractConfiguration.h>
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#include <Poco/Data/SessionPool.h>
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namespace DB
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{
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/// Allows loading dictionaries from a ODBC source
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class ODBCDictionarySource final : public IDictionarySource
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{
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static constexpr auto max_block_size = 8192;
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public:
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ODBCDictionarySource(const DictionaryStructure & dict_struct_,
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const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix,
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const Block & sample_block);
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/// copy-constructor is provided in order to support cloneability
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ODBCDictionarySource(const ODBCDictionarySource & other);
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BlockInputStreamPtr loadAll() override;
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BlockInputStreamPtr loadIds(const std::vector<std::uint64_t> & 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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bool isModified() const override;
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bool supportsSelectiveLoad() const override;
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DictionarySourcePtr clone() const override;
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std::string toString() const override;
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private:
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Logger * log = &Logger::get("ODBCDictionarySource");
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const DictionaryStructure dict_struct;
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const std::string db;
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const std::string table;
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const std::string where;
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Block sample_block;
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std::shared_ptr<Poco::Data::SessionPool> pool;
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ExternalQueryBuilder query_builder;
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const std::string load_all_query;
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};
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}
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