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