ClickHouse/src/Storages/StorageMySQL.cpp

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