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190 lines
6.7 KiB
C++
190 lines
6.7 KiB
C++
#pragma once
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#include <DB/Core/Block.h>
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#include <DB/DataStreams/IProfilingBlockInputStream.h>
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#include <DB/DataTypes/DataTypesNumberFixed.h>
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#include <DB/DataTypes/DataTypeString.h>
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#include <DB/DataTypes/DataTypeDate.h>
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#include <DB/DataTypes/DataTypeDateTime.h>
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#include <DB/Columns/ColumnString.h>
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#include <statdaemons/ext/range.hpp>
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#include <mysqlxx/Query.h>
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#include <mysqlxx/PoolWithFailover.h>
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#include <vector>
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#include <string>
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namespace DB
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{
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/// Allows processing results of a MySQL query as a sequence of Blocks, simplifies chaining
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class MySQLBlockInputStream final : public IProfilingBlockInputStream
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{
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enum struct value_type_t
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{
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UInt8,
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UInt16,
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UInt32,
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UInt64,
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Int8,
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Int16,
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Int32,
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Int64,
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Float32,
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Float64,
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String,
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Date,
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DateTime
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};
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public:
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MySQLBlockInputStream(const mysqlxx::PoolWithFailover::Entry & entry,
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const std::string & query_str,
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const Block & sample_block,
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const std::size_t max_block_size)
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: entry{entry}, query{this->entry->query(query_str)}, result{query.use()},
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sample_block{sample_block}, 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{
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"mysqlxx::UseQueryResult contains " + toString(result.getNumFields()) + " columns while " +
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toString(sample_block.columns()) + " expected",
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ErrorCodes::NUMBER_OF_COLUMNS_DOESNT_MATCH
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};
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types.reserve(sample_block.columns());
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for (const auto idx : ext::range(0, sample_block.columns()))
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{
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const auto type = sample_block.getByPosition(idx).type.get();
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if (typeid_cast<const DataTypeUInt8 *>(type))
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types.push_back(value_type_t::UInt8);
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else if (typeid_cast<const DataTypeUInt16 *>(type))
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types.push_back(value_type_t::UInt16);
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else if (typeid_cast<const DataTypeUInt32 *>(type))
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types.push_back(value_type_t::UInt32);
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else if (typeid_cast<const DataTypeUInt64 *>(type))
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types.push_back(value_type_t::UInt64);
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else if (typeid_cast<const DataTypeInt8 *>(type))
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types.push_back(value_type_t::Int8);
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else if (typeid_cast<const DataTypeInt16 *>(type))
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types.push_back(value_type_t::Int16);
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else if (typeid_cast<const DataTypeInt32 *>(type))
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types.push_back(value_type_t::Int32);
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else if (typeid_cast<const DataTypeInt64 *>(type))
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types.push_back(value_type_t::Int64);
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else if (typeid_cast<const DataTypeFloat32 *>(type))
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types.push_back(value_type_t::Float32);
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else if (typeid_cast<const DataTypeInt64 *>(type))
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types.push_back(value_type_t::Float64);
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else if (typeid_cast<const DataTypeString *>(type))
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types.push_back(value_type_t::String);
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else if (typeid_cast<const DataTypeDate *>(type))
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types.push_back(value_type_t::Date);
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else if (typeid_cast<const DataTypeDateTime *>(type))
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types.push_back(value_type_t::DateTime);
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else
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throw Exception{
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"Unsupported type " + type->getName(),
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ErrorCodes::UNKNOWN_TYPE
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};
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}
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}
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String getName() const override { return "MySQLBlockInputStream"; }
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String getID() const override
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{
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return "MySQL(" + query.str() + ")";
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}
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private:
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Block readImpl() override
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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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auto block = sample_block.cloneEmpty();
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/// cache pointers returned by the calls to getByPosition
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std::vector<IColumn *> columns(block.columns());
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for (const auto i : ext::range(0, columns.size()))
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columns[i] = block.getByPosition(i).column.get();
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std::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], types[idx], value);
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else
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insertDefaultValue(columns[idx], types[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 block;
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}
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static void insertValue(IColumn * const column, const value_type_t type, const mysqlxx::Value & value)
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{
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switch (type)
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{
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case value_type_t::UInt8: static_cast<ColumnUInt8 *>(column)->insert(value.getUInt()); break;
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case value_type_t::UInt16: static_cast<ColumnUInt16 *>(column)->insert(value.getUInt()); break;
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case value_type_t::UInt32: static_cast<ColumnUInt32 *>(column)->insert(value.getUInt()); break;
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case value_type_t::UInt64: static_cast<ColumnUInt64 *>(column)->insert(value.getUInt()); break;
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case value_type_t::Int8: static_cast<ColumnInt8 *>(column)->insert(value.getInt()); break;
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case value_type_t::Int16: static_cast<ColumnInt16 *>(column)->insert(value.getInt()); break;
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case value_type_t::Int32: static_cast<ColumnInt32 *>(column)->insert(value.getInt()); break;
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case value_type_t::Int64: static_cast<ColumnInt64 *>(column)->insert(value.getInt()); break;
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case value_type_t::Float32: static_cast<ColumnFloat32 *>(column)->insert(value.getDouble()); break;
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case value_type_t::Float64: static_cast<ColumnFloat64 *>(column)->insert(value.getDouble()); break;
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case value_type_t::String:
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{
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const auto string = value.getString();
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static_cast<ColumnString *>(column)->insertDataWithTerminatingZero(string.data(), string.size() + 1);
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break;
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}
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case value_type_t::Date: static_cast<ColumnUInt16 *>(column)->insert(UInt16{value.getDate().getDayNum()}); break;
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case value_type_t::DateTime: static_cast<ColumnUInt32 *>(column)->insert(time_t{value.getDateTime()}); break;
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}
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}
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static void insertDefaultValue(IColumn * const column, const value_type_t type)
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{
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switch (type)
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{
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case value_type_t::UInt8: static_cast<ColumnUInt8 *>(column)->insertDefault(); break;
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case value_type_t::UInt16: static_cast<ColumnUInt16 *>(column)->insertDefault(); break;
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case value_type_t::UInt32: static_cast<ColumnUInt32 *>(column)->insertDefault(); break;
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case value_type_t::UInt64: static_cast<ColumnUInt64 *>(column)->insertDefault(); break;
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case value_type_t::Int8: static_cast<ColumnInt8 *>(column)->insertDefault(); break;
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case value_type_t::Int16: static_cast<ColumnInt16 *>(column)->insertDefault(); break;
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case value_type_t::Int32: static_cast<ColumnInt32 *>(column)->insertDefault(); break;
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case value_type_t::Int64: static_cast<ColumnInt64 *>(column)->insertDefault(); break;
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case value_type_t::Float32: static_cast<ColumnFloat32 *>(column)->insertDefault(); break;
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case value_type_t::Float64: static_cast<ColumnFloat64 *>(column)->insertDefault(); break;
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case value_type_t::String: static_cast<ColumnString *>(column)->insertDefault(); break;
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case value_type_t::Date: static_cast<ColumnUInt16 *>(column)->insertDefault(); break;
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case value_type_t::DateTime: static_cast<ColumnUInt32 *>(column)->insertDefault(); break;
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}
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}
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mysqlxx::PoolWithFailover::Entry entry;
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mysqlxx::Query query;
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mysqlxx::UseQueryResult result;
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Block sample_block;
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const std::size_t max_block_size;
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std::vector<value_type_t> types;
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};
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}
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