ClickHouse/programs/odbc-bridge/ODBCBlockInputStream.h

43 lines
1.1 KiB
C++

#pragma once
#include <string>
#include <Core/Block.h>
#include <Processors/ISource.h>
#include <Core/ExternalResultDescription.h>
#include "ODBCPooledConnectionFactory.h"
namespace DB
{
/// Allows processing results of a query to ODBC source as a sequence of Blocks, simplifies chaining
class ODBCSource final : public ISource
{
public:
ODBCSource(nanodbc::ConnectionHolderPtr connection, const std::string & query_str, const Block & sample_block, UInt64 max_block_size_);
String getName() const override { return "ODBC"; }
private:
using QueryResult = std::shared_ptr<nanodbc::result>;
using ValueType = ExternalResultDescription::ValueType;
Chunk generate() override;
static void insertValue(IColumn & column, DataTypePtr data_type, ValueType type, nanodbc::result & row, size_t idx);
static void insertDefaultValue(IColumn & column, const IColumn & sample_column)
{
column.insertFrom(sample_column, 0);
}
Poco::Logger * log;
const UInt64 max_block_size;
ExternalResultDescription description;
nanodbc::result result;
String query;
bool is_finished = false;
};
}