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251 lines
8.1 KiB
C++
251 lines
8.1 KiB
C++
#include "StorageMySQL.h"
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#if USE_MYSQL
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#include <Storages/StorageFactory.h>
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#include <Storages/transformQueryForExternalDatabase.h>
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#include <Formats/MySQLBlockInputStream.h>
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#include <Interpreters/evaluateConstantExpression.h>
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#include <Core/Settings.h>
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#include <Interpreters/Context.h>
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#include <DataStreams/IBlockOutputStream.h>
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#include <Formats/FormatFactory.h>
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#include <Common/parseAddress.h>
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#include <IO/Operators.h>
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#include <IO/WriteHelpers.h>
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#include <Parsers/ASTLiteral.h>
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#include <mysqlxx/Transaction.h>
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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_ARGUMENTS_DOESNT_MATCH;
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extern const int BAD_ARGUMENTS;
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}
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static String backQuoteMySQL(const String & x)
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{
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String res(x.size(), '\0');
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{
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WriteBufferFromString wb(res);
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writeBackQuotedStringMySQL(x, wb);
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}
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return res;
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}
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StorageMySQL::StorageMySQL(
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const StorageID & table_id_,
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mysqlxx::Pool && pool_,
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const std::string & remote_database_name_,
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const std::string & remote_table_name_,
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const bool replace_query_,
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const std::string & on_duplicate_clause_,
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const ColumnsDescription & columns_,
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const ConstraintsDescription & constraints_,
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const Context & context_)
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: IStorage(table_id_)
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, remote_database_name(remote_database_name_)
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, remote_table_name(remote_table_name_)
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, replace_query{replace_query_}
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, on_duplicate_clause{on_duplicate_clause_}
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, pool(std::move(pool_))
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, global_context(context_)
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{
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setColumns(columns_);
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setConstraints(constraints_);
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}
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BlockInputStreams StorageMySQL::read(
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const Names & column_names_,
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const SelectQueryInfo & query_info_,
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const Context & context_,
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QueryProcessingStage::Enum /*processed_stage*/,
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size_t max_block_size_,
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unsigned)
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{
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check(column_names_);
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String query = transformQueryForExternalDatabase(
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*query_info_.query, getColumns().getOrdinary(), IdentifierQuotingStyle::BackticksMySQL, remote_database_name, remote_table_name, context_);
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Block sample_block;
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for (const String & column_name : column_names_)
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{
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auto column_data = getColumn(column_name);
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sample_block.insert({ column_data.type, column_data.name });
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}
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return { std::make_shared<MySQLBlockInputStream>(pool.Get(), query, sample_block, max_block_size_) };
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}
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class StorageMySQLBlockOutputStream : public IBlockOutputStream
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{
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public:
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explicit StorageMySQLBlockOutputStream(const StorageMySQL & storage_,
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const std::string & remote_database_name_,
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const std::string & remote_table_name_,
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const mysqlxx::PoolWithFailover::Entry & entry_,
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const size_t & mysql_max_rows_to_insert)
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: storage{storage_}
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, remote_database_name{remote_database_name_}
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, remote_table_name{remote_table_name_}
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, entry{entry_}
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, max_batch_rows{mysql_max_rows_to_insert}
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{
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}
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Block getHeader() const override { return storage.getSampleBlock(); }
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void write(const Block & block) override
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{
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auto blocks = splitBlocks(block, max_batch_rows);
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mysqlxx::Transaction trans(entry);
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try
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{
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for (const Block & batch_data : blocks)
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{
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writeBlockData(batch_data);
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}
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trans.commit();
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}
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catch (...)
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{
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trans.rollback();
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throw;
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}
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}
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void writeBlockData(const Block & block)
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{
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WriteBufferFromOwnString sqlbuf;
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sqlbuf << (storage.replace_query ? "REPLACE" : "INSERT") << " INTO ";
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sqlbuf << backQuoteMySQL(remote_database_name) << "." << backQuoteMySQL(remote_table_name);
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sqlbuf << " (" << dumpNamesWithBackQuote(block) << ") VALUES ";
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auto writer = FormatFactory::instance().getOutput("Values", sqlbuf, storage.getSampleBlock(), storage.global_context);
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writer->write(block);
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if (!storage.on_duplicate_clause.empty())
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sqlbuf << " ON DUPLICATE KEY " << storage.on_duplicate_clause;
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sqlbuf << ";";
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auto query = this->entry->query(sqlbuf.str());
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query.execute();
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}
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Blocks splitBlocks(const Block & block, const size_t & max_rows) const
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{
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/// Avoid Excessive copy when block is small enough
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if (block.rows() <= max_rows)
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return Blocks{std::move(block)};
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const size_t splited_block_size = ceil(block.rows() * 1.0 / max_rows);
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Blocks splitted_blocks(splited_block_size);
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for (size_t idx = 0; idx < splited_block_size; ++idx)
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splitted_blocks[idx] = block.cloneEmpty();
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const size_t columns = block.columns();
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const size_t rows = block.rows();
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size_t offsets = 0;
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UInt64 limits = max_batch_rows;
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for (size_t idx = 0; idx < splited_block_size; ++idx)
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{
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/// For last batch, limits should be the remain size
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if (idx == splited_block_size - 1) limits = rows - offsets;
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for (size_t col_idx = 0; col_idx < columns; ++col_idx)
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{
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splitted_blocks[idx].getByPosition(col_idx).column = block.getByPosition(col_idx).column->cut(offsets, limits);
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}
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offsets += max_batch_rows;
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}
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return splitted_blocks;
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}
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std::string dumpNamesWithBackQuote(const Block & block) const
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{
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WriteBufferFromOwnString out;
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for (auto it = block.begin(); it != block.end(); ++it)
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{
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if (it != block.begin())
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out << ", ";
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out << backQuoteMySQL(it->name);
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}
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return out.str();
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}
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private:
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const StorageMySQL & storage;
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std::string remote_database_name;
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std::string remote_table_name;
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mysqlxx::PoolWithFailover::Entry entry;
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size_t max_batch_rows;
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};
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BlockOutputStreamPtr StorageMySQL::write(
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const ASTPtr & /*query*/, const Context & context)
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{
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return std::make_shared<StorageMySQLBlockOutputStream>(*this, remote_database_name, remote_table_name, pool.Get(), context.getSettingsRef().mysql_max_rows_to_insert);
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}
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void registerStorageMySQL(StorageFactory & factory)
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{
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factory.registerStorage("MySQL", [](const StorageFactory::Arguments & args)
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{
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ASTs & engine_args = args.engine_args;
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if (engine_args.size() < 5 || engine_args.size() > 7)
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throw Exception(
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"Storage MySQL requires 5-7 parameters: MySQL('host:port', database, table, 'user', 'password'[, replace_query, 'on_duplicate_clause']).",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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for (size_t i = 0; i < engine_args.size(); ++i)
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engine_args[i] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[i], args.local_context);
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/// 3306 is the default MySQL port.
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auto parsed_host_port = parseAddress(engine_args[0]->as<ASTLiteral &>().value.safeGet<String>(), 3306);
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const String & remote_database = engine_args[1]->as<ASTLiteral &>().value.safeGet<String>();
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const String & remote_table = engine_args[2]->as<ASTLiteral &>().value.safeGet<String>();
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const String & username = engine_args[3]->as<ASTLiteral &>().value.safeGet<String>();
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const String & password = engine_args[4]->as<ASTLiteral &>().value.safeGet<String>();
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mysqlxx::Pool pool(remote_database, parsed_host_port.first, username, password, parsed_host_port.second);
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bool replace_query = false;
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std::string on_duplicate_clause;
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if (engine_args.size() >= 6)
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replace_query = engine_args[5]->as<ASTLiteral &>().value.safeGet<UInt64>();
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if (engine_args.size() == 7)
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on_duplicate_clause = engine_args[6]->as<ASTLiteral &>().value.safeGet<String>();
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if (replace_query && !on_duplicate_clause.empty())
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throw Exception(
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"Only one of 'replace_query' and 'on_duplicate_clause' can be specified, or none of them",
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ErrorCodes::BAD_ARGUMENTS);
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return StorageMySQL::create(
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args.table_id,
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std::move(pool),
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remote_database,
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remote_table,
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replace_query,
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on_duplicate_clause,
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args.columns,
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args.constraints,
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args.context);
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});
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}
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}
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#endif
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