ClickHouse/dbms/programs/odbc-bridge/ODBCBlockInputStream.h

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#pragma once
#include <string>
#include <Core/Block.h>
#include <DataStreams/IBlockInputStream.h>
#include <Poco/Data/RecordSet.h>
#include <Poco/Data/Session.h>
#include <Poco/Data/Statement.h>
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#include <Core/ExternalResultDescription.h>
namespace DB
{
/// Allows processing results of a query to ODBC source as a sequence of Blocks, simplifies chaining
class ODBCBlockInputStream final : public IBlockInputStream
{
public:
ODBCBlockInputStream(
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Poco::Data::Session && session, const std::string & query_str, const Block & sample_block, const UInt64 max_block_size);
String getName() const override { return "ODBC"; }
Block getHeader() const override { return description.sample_block.cloneEmpty(); }
private:
Block readImpl() override;
Poco::Data::Session session;
Poco::Data::Statement statement;
Poco::Data::RecordSet result;
Poco::Data::RecordSet::Iterator iterator;
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const UInt64 max_block_size;
ExternalResultDescription description;
Poco::Logger * log;
};
}