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108 lines
3.8 KiB
C++
108 lines
3.8 KiB
C++
#include <Dictionaries/ODBCBlockInputStream.h>
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#include <Columns/ColumnsNumber.h>
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#include <Columns/ColumnString.h>
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#include <IO/WriteHelpers.h>
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#include <common/logger_useful.h>
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#include <ext/range.h>
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#include <vector>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int NUMBER_OF_COLUMNS_DOESNT_MATCH;
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}
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ODBCBlockInputStream::ODBCBlockInputStream(
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Poco::Data::Session && session, const std::string & query_str, const Block & sample_block,
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const size_t max_block_size)
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:
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session{session},
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statement{(this->session << query_str, Poco::Data::Keywords::now)},
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result{statement},
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iterator{result.begin()},
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max_block_size{max_block_size},
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log(&Logger::get("ODBCBlockInputStream"))
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{
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if (sample_block.columns() != result.columnCount())
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throw Exception{"RecordSet contains " + toString(result.columnCount()) + " columns while " +
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toString(sample_block.columns()) + " expected", ErrorCodes::NUMBER_OF_COLUMNS_DOESNT_MATCH};
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description.init(sample_block);
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}
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namespace
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{
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using ValueType = ExternalResultDescription::ValueType;
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static void insertValue(IColumn & column, const ValueType type, const Poco::Dynamic::Var & value)
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{
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switch (type)
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{
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case ValueType::UInt8: static_cast<ColumnUInt8 &>(column).insert(value.convert<UInt64>()); break;
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case ValueType::UInt16: static_cast<ColumnUInt16 &>(column).insert(value.convert<UInt64>()); break;
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case ValueType::UInt32: static_cast<ColumnUInt32 &>(column).insert(value.convert<UInt64>()); break;
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case ValueType::UInt64: static_cast<ColumnUInt64 &>(column).insert(value.convert<UInt64>()); break;
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case ValueType::Int8: static_cast<ColumnInt8 &>(column).insert(value.convert<Int64>()); break;
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case ValueType::Int16: static_cast<ColumnInt16 &>(column).insert(value.convert<Int64>()); break;
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case ValueType::Int32: static_cast<ColumnInt32 &>(column).insert(value.convert<Int64>()); break;
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case ValueType::Int64: static_cast<ColumnInt64 &>(column).insert(value.convert<Int64>()); break;
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case ValueType::Float32: static_cast<ColumnFloat32 &>(column).insert(value.convert<Float64>()); break;
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case ValueType::Float64: static_cast<ColumnFloat64 &>(column).insert(value.convert<Float64>()); break;
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case ValueType::String: static_cast<ColumnString &>(column).insert(value.convert<String>()); break;
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case ValueType::Date: static_cast<ColumnUInt16 &>(column).insert(UInt16{LocalDate{value.convert<String>()}.getDayNum()}); break;
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case ValueType::DateTime: static_cast<ColumnUInt32 &>(column).insert(time_t{LocalDateTime{value.convert<String>()}}); break;
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}
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}
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void insertDefaultValue(IColumn & column, const IColumn & sample_column)
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{
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column.insertFrom(sample_column, 0);
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}
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}
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Block ODBCBlockInputStream::readImpl()
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{
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if (iterator == result.end())
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return {};
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MutableColumns columns(description.sample_block.columns());
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for (const auto i : ext::range(0, columns.size()))
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columns[i] = description.sample_block.getByPosition(i).column->cloneEmpty();
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size_t num_rows = 0;
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while (iterator != result.end())
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{
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Poco::Data::Row & row = *iterator;
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for (const auto idx : ext::range(0, row.fieldCount()))
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{
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const Poco::Dynamic::Var & value = row[idx];
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if (!value.isEmpty())
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insertValue(*columns[idx], description.types[idx], value);
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else
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insertDefaultValue(*columns[idx], *description.sample_columns[idx]);
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}
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++iterator;
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++num_rows;
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if (num_rows == max_block_size)
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break;
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}
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return description.sample_block.cloneWithColumns(std::move(columns));
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}
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}
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