ClickHouse/dbms/include/DB/Dictionaries/ODBCDictionarySource.h

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