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dbms: development.

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This commit is contained in:
Alexey Milovidov 2010-06-04 19:06:32 +00:00
parent 9e053a93f3
commit 75545a34e1
6 changed files with 54 additions and 51 deletions
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3
dbms/include/DB/DataTypes/IDataType.h
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@ -26,9 +26,6 @@ public:
/// Клонировать
virtual SharedPtr<IDataType> clone() const = 0;
/** Предполагается, что проверка статуса stream-ов производится вызывающей стороной.
*/
/** Бинарная сериализация - для сохранения на диск / в сеть и т. п.
* Обратите внимание, что присутствует по два вида методов
* - для работы с единичными значениями и целыми столбцами.

2
dbms/include/DB/DataTypes/IDataTypeNumberFixed.h
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@ -34,7 +34,7 @@ public:
void deserializeBinary(Field & field, ReadBuffer & istr) const
{
typename ColumnType::value_type x;
istr.read(reinterpret_cast<char *>(&x), sizeof(x));
istr.readStrict(reinterpret_cast<char *>(&x), sizeof(x));
field = typename NearestFieldType<FieldType>::Type(x);
}

8
dbms/include/DB/IO/CompressedReadBuffer.h
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@ -36,9 +36,7 @@ public:
/** Читает и разжимает следующий кусок сжатых данных. */
void readCompressedChunk()
{
size_t size = in.read(&compressed_buffer[0], QUICKLZ_HEADER_SIZE);
if (size != QUICKLZ_HEADER_SIZE)
throw Exception("Cannot read size of compressed chunk", ErrorCodes::CANNOT_READ_SIZE_OF_COMPRESSED_CHUNK);
in.readStrict(&compressed_buffer[0], QUICKLZ_HEADER_SIZE);
size_t size_compressed = qlz_size_compressed(internal_buffer);
size_t size_decompressed = qlz_size_decompressed(internal_buffer);
@ -46,9 +44,7 @@ public:
compressed_buffer.resize(size_compressed);
decompressed_buffer.resize(size_decompressed);
size = in.read(&compressed_buffer[QUICKLZ_HEADER_SIZE], size_compressed - QUICKLZ_HEADER_SIZE);
if (size != size_compressed - QUICKLZ_HEADER_SIZE)
throw Exception("Cannot read compressed chunk", ErrorCodes::CANNOT_READ_COMPRESSED_CHUNK);
in.readStrict(&compressed_buffer[QUICKLZ_HEADER_SIZE], size_compressed - QUICKLZ_HEADER_SIZE);
pos_in_buffer = 0;
}

1
dbms/include/DB/IO/ReadBuffer.h
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@ -82,6 +82,7 @@ public:
size_t bytes_to_copy = std::min(static_cast<size_t>(working_buffer.end() - pos), n - bytes_copied);
std::memcpy(to, pos, bytes_to_copy);
pos += bytes_to_copy;
bytes_copied += bytes_to_copy;
}
return bytes_copied;

11
dbms/src/DataTypes/DataTypeString.cpp
View File

@ -33,7 +33,7 @@ void DataTypeString::deserializeBinary(Field & field, ReadBuffer & istr) const
String & s = boost::get<String>(field);
s.resize(size);
/// непереносимо, но (действительно) быстрее
istr.read(const_cast<char*>(s.data()), size);
istr.readStrict(const_cast<char*>(s.data()), size);
}
@ -47,12 +47,12 @@ void DataTypeString::serializeBinary(const IColumn & column, WriteBuffer & ostr)
if (!size)
return;
writeVarUInt(offsets[0], ostr);
ostr.write(reinterpret_cast<const char *>(&data[0]), offsets[0]);
writeVarUInt(offsets[0] - 1, ostr);
ostr.write(reinterpret_cast<const char *>(&data[0]), offsets[0] - 1);
for (size_t i = 1; i < size; ++i)
{
UInt64 str_size = offsets[i] - offsets[i - 1];
UInt64 str_size = offsets[i] - offsets[i - 1] - 1;
writeVarUInt(str_size, ostr);
ostr.write(reinterpret_cast<const char *>(&data[offsets[i - 1]]), str_size);
}
@ -83,7 +83,8 @@ void DataTypeString::deserializeBinary(IColumn & column, ReadBuffer & istr, size
if (data.size() < offset)
data.resize(offset);
istr.read(reinterpret_cast<char*>(&data[offset - size]), sizeof(ColumnUInt8::value_type) * size);
istr.readStrict(reinterpret_cast<char*>(&data[offset - size]), sizeof(ColumnUInt8::value_type) * size);
data[offset - 1] = 0;
}
}

80
dbms/src/DataTypes/tests/data_type_string.cpp
View File

@ -14,50 +14,58 @@
int main(int argc, char ** argv)
{
Poco::Stopwatch stopwatch;
size_t n = 10000000;
const char * s = "Hello, world!";
size_t size = strlen(s) + 1;
DB::DataTypeString data_type;
try
{
Poco::SharedPtr<DB::ColumnString> column = new DB::ColumnString();
DB::ColumnUInt8::Container_t & data = dynamic_cast<DB::ColumnUInt8 &>(column->getData()).getData();
DB::ColumnArray::Offsets_t & offsets = column->getOffsets();
data.resize(n * size);
offsets.resize(n);
for (size_t i = 0; i < n; ++i)
Poco::Stopwatch stopwatch;
size_t n = 10000000;
const char * s = "abcdefghi";
size_t size = strlen(s) + 1;
DB::DataTypeString data_type;
{
memcpy(&data[i * size], s, size);
offsets[i] = (i + 1) * size;
Poco::SharedPtr<DB::ColumnString> column = new DB::ColumnString();
DB::ColumnUInt8::Container_t & data = dynamic_cast<DB::ColumnUInt8 &>(column->getData()).getData();
DB::ColumnArray::Offsets_t & offsets = column->getOffsets();
data.resize(n * size);
offsets.resize(n);
for (size_t i = 0; i < n; ++i)
{
memcpy(&data[i * size], s, size);
offsets[i] = (i + 1) * size;
}
std::ofstream ostr("test");
DB::WriteBufferFromOStream out_buf(ostr);
stopwatch.restart();
data_type.serializeBinary(*column, out_buf);
stopwatch.stop();
std::cout << "Writing, elapsed: " << static_cast<double>(stopwatch.elapsed()) / 1000000 << std::endl;
}
std::ofstream ostr("test");
DB::WriteBufferFromOStream out_buf(ostr);
{
Poco::SharedPtr<DB::ColumnString> column = new DB::ColumnString();
stopwatch.restart();
data_type.serializeBinary(*column, out_buf);
stopwatch.stop();
std::ifstream istr("test");
DB::ReadBufferFromIStream in_buf(istr);
std::cout << "Writing, elapsed: " << static_cast<double>(stopwatch.elapsed()) / 1000000 << std::endl;
stopwatch.restart();
data_type.deserializeBinary(*column, in_buf, n);
stopwatch.stop();
std::cout << "Reading, elapsed: " << static_cast<double>(stopwatch.elapsed()) / 1000000 << std::endl;
std::cout << std::endl
<< boost::get<DB::String>((*column)[0]) << std::endl
<< boost::get<DB::String>((*column)[n - 1]) << std::endl;
}
}
catch (const DB::Exception & e)
{
Poco::SharedPtr<DB::ColumnString> column = new DB::ColumnString();
std::ifstream istr("test");
DB::ReadBufferFromIStream in_buf(istr);
stopwatch.restart();
data_type.deserializeBinary(*column, in_buf, n);
stopwatch.stop();
std::cout << "Reading, elapsed: " << static_cast<double>(stopwatch.elapsed()) / 1000000 << std::endl;
std::cout << std::endl
<< boost::get<DB::String>((*column)[0]) << std::endl
<< boost::get<DB::String>((*column)[n - 1]) << std::endl;
std::cerr << e.what() << ", " << e.message() << std::endl;
return 1;
}
return 0;