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973bdab77f
* Format ODBCDriver2 with NULL support * Fix comment * Update ODBCDriver2BlockOutputStream.cpp * clean
45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
#pragma once
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#include <string>
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#include <Core/Block.h>
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#include <DataStreams/IBlockOutputStream.h>
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#include <Formats/FormatSettings.h>
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namespace DB
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{
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class WriteBuffer;
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/** A data format designed to simplify the implementation of the ODBC driver.
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* ODBC driver is designed to be build for different platforms without dependencies from the main code,
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* so the format is made that way so that it can be as easy as possible to parse it.
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* A header is displayed with the required information.
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* The data is then output in the order of the rows. Each value is displayed as follows: length in Int32 format (-1 for NULL), then data in text form.
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*/
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class ODBCDriver2BlockOutputStream : public IBlockOutputStream
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{
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public:
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ODBCDriver2BlockOutputStream(WriteBuffer & out_, const Block & header_, const FormatSettings & format_settings);
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Block getHeader() const override
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{
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return header;
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}
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void write(const Block & block) override;
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void writePrefix() override;
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void flush() override;
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std::string getContentType() const override
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{
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return "application/octet-stream";
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}
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private:
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WriteBuffer & out;
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const Block header;
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const FormatSettings format_settings;
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};
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}
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