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40 lines
1.0 KiB
C++
40 lines
1.0 KiB
C++
#pragma once
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#include <string>
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#include <Core/Block.h>
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#include <DataStreams/IBlockInputStream.h>
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#include <Poco/Data/RecordSet.h>
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#include <Poco/Data/Session.h>
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#include <Poco/Data/Statement.h>
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#include <Core/ExternalResultDescription.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 ODBCBlockInputStream final : public IBlockInputStream
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{
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public:
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ODBCBlockInputStream(
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Poco::Data::Session && session_, const std::string & query_str, const Block & sample_block, const UInt64 max_block_size_);
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String getName() const override { return "ODBC"; }
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Block getHeader() const override { return description.sample_block.cloneEmpty(); }
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private:
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Block readImpl() override;
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Poco::Data::Session session;
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Poco::Data::Statement statement;
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Poco::Data::RecordSet result;
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Poco::Data::RecordSet::Iterator iterator;
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const UInt64 max_block_size;
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ExternalResultDescription description;
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Poco::Logger * log;
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};
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}
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