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105 lines
2.8 KiB
C++
105 lines
2.8 KiB
C++
#include <Core/Block.h>
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#include <Formats/FormatFactory.h>
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#include <Formats/ODBCDriver2BlockOutputStream.h>
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#include <IO/WriteBuffer.h>
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#include <IO/WriteHelpers.h>
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#include <Core/iostream_debug_helpers.h>
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namespace DB
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{
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ODBCDriver2BlockOutputStream::ODBCDriver2BlockOutputStream(
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WriteBuffer & out_, const Block & header_, const FormatSettings & format_settings)
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: out(out_), header(header_), format_settings(format_settings)
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{
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}
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void ODBCDriver2BlockOutputStream::flush()
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{
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out.next();
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}
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void writeODBCString(WriteBuffer & out, const std::string & str)
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{
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writeIntBinary(Int32(str.size()), out);
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out.write(str.data(), str.size());
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}
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static void writeRow(const Block & block, size_t row_idx, WriteBuffer & out, const FormatSettings & format_settings, std::string & buffer)
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{
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size_t columns = block.columns();
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for (size_t column_idx = 0; column_idx < columns; ++column_idx)
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{
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buffer.clear();
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const ColumnWithTypeAndName & col = block.getByPosition(column_idx);
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if (col.column->isNullAt(row_idx))
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{
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writeIntBinary(Int32(-1), out);
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}
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else
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{
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{
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WriteBufferFromString text_out(buffer);
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col.type->serializeText(*col.column, row_idx, text_out, format_settings);
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}
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writeODBCString(out, buffer);
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}
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}
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}
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void ODBCDriver2BlockOutputStream::write(const Block & block)
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{
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String text_value;
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const size_t rows = block.rows();
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for (size_t i = 0; i < rows; ++i)
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writeRow(block, i, out, format_settings, text_value);
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}
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void ODBCDriver2BlockOutputStream::writeSuffix()
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{
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if (totals)
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write(totals);
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}
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void ODBCDriver2BlockOutputStream::writePrefix()
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{
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const size_t columns = header.columns();
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/// Number of header rows.
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writeIntBinary(Int32(2), out);
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/// Names of columns.
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/// Number of columns + 1 for first name column.
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writeIntBinary(Int32(columns + 1), out);
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writeODBCString(out, "name");
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for (size_t i = 0; i < columns; ++i)
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{
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const ColumnWithTypeAndName & col = header.getByPosition(i);
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writeODBCString(out, col.name);
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}
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/// Types of columns.
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writeIntBinary(Int32(columns + 1), out);
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writeODBCString(out, "type");
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for (size_t i = 0; i < columns; ++i)
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{
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const ColumnWithTypeAndName & col = header.getByPosition(i);
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writeODBCString(out, col.type->getName());
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}
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}
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void registerOutputFormatODBCDriver2(FormatFactory & factory)
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{
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factory.registerOutputFormat(
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"ODBCDriver2", [](WriteBuffer & buf, const Block & sample, const Context &, const FormatSettings & format_settings)
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{
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return std::make_shared<ODBCDriver2BlockOutputStream>(buf, sample, format_settings);
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});
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}
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}
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