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49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
#pragma once
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#include <string>
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#include <Processors/Formats/IOutputFormat.h>
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#include <Formats/FormatSettings.h>
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#include <Core/Block.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 VarUInt format, then data in text form.
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*/
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class ODBCDriverBlockOutputFormat : public IOutputFormat
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{
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public:
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ODBCDriverBlockOutputFormat(WriteBuffer & out_, const Block & header_, const FormatSettings & format_settings_);
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String getName() const override { return "ODBCDriverBlockOutputFormat"; }
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void consume(Chunk) override;
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void finalize() override;
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std::string getContentType() const override { return "application/octet-stream"; }
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private:
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const FormatSettings format_settings;
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bool prefix_written = false;
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void writePrefixIfNot()
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{
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if (!prefix_written)
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writePrefix();
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prefix_written = true;
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}
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void writePrefix();
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};
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}
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