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101 lines
3.5 KiB
C++
101 lines
3.5 KiB
C++
#include <Common/config.h>
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#if USE_MYSQL
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#include <Dictionaries/MySQLBlockInputStream.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 <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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MySQLBlockInputStream::MySQLBlockInputStream(
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const mysqlxx::PoolWithFailover::Entry & entry, const std::string & query_str, const Block & sample_block,
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const size_t max_block_size)
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: entry{entry}, query{this->entry->query(query_str)}, result{query.use()},
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max_block_size{max_block_size}
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{
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if (sample_block.columns() != result.getNumFields())
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throw Exception{"mysqlxx::UseQueryResult contains " + toString(result.getNumFields()) + " columns while " + toString(sample_block.columns()) + " expected",
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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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void insertValue(IColumn & column, const ValueType type, const mysqlxx::Value & 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.getUInt()); break;
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case ValueType::UInt16: static_cast<ColumnUInt16 &>(column).insert(value.getUInt()); break;
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case ValueType::UInt32: static_cast<ColumnUInt32 &>(column).insert(value.getUInt()); break;
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case ValueType::UInt64: static_cast<ColumnUInt64 &>(column).insert(value.getUInt()); break;
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case ValueType::Int8: static_cast<ColumnInt8 &>(column).insert(value.getInt()); break;
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case ValueType::Int16: static_cast<ColumnInt16 &>(column).insert(value.getInt()); break;
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case ValueType::Int32: static_cast<ColumnInt32 &>(column).insert(value.getInt()); break;
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case ValueType::Int64: static_cast<ColumnInt64 &>(column).insert(value.getInt()); break;
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case ValueType::Float32: static_cast<ColumnFloat32 &>(column).insert(value.getDouble()); break;
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case ValueType::Float64: static_cast<ColumnFloat64 &>(column).insert(value.getDouble()); break;
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case ValueType::String: static_cast<ColumnString &>(column).insertData(value.data(), value.size()); break;
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case ValueType::Date: static_cast<ColumnUInt16 &>(column).insert(UInt16{value.getDate().getDayNum()}); break;
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case ValueType::DateTime: static_cast<ColumnUInt32 &>(column).insert(time_t{value.getDateTime()}); 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 MySQLBlockInputStream::readImpl()
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{
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auto row = result.fetch();
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if (!row)
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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 (row)
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{
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for (const auto idx : ext::range(0, row.size()))
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{
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const auto value = row[idx];
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if (!value.isNull())
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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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++num_rows;
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if (num_rows == max_block_size)
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break;
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row = result.fetch();
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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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#endif
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