mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-24 00:22:29 +00:00
97 lines
2.9 KiB
C++
97 lines
2.9 KiB
C++
#pragma once
|
|
|
|
#include <DB/Dictionaries/IDictionarySource.h>
|
|
#include <DB/Dictionaries/ODBCBlockInputStream.h>
|
|
#include <DB/Dictionaries/ExternalQueryBuilder.h>
|
|
#include <ext/range.hpp>
|
|
#include <mysqlxx/Pool.h>
|
|
#include <Poco/Util/AbstractConfiguration.h>
|
|
#include <Poco/Data/SessionPool.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
|
|
/// Allows loading dictionaries from a ODBC source
|
|
class ODBCDictionarySource final : public IDictionarySource
|
|
{
|
|
static const auto max_block_size = 8192;
|
|
|
|
public:
|
|
ODBCDictionarySource(const DictionaryStructure & dict_struct_,
|
|
const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix,
|
|
const Block & sample_block)
|
|
: dict_struct{dict_struct_},
|
|
db{config.getString(config_prefix + ".db", "")},
|
|
table{config.getString(config_prefix + ".table")},
|
|
where{config.getString(config_prefix + ".where", "")},
|
|
sample_block{sample_block},
|
|
pool{std::make_shared<Poco::Data::SessionPool>(
|
|
config.getString(config_prefix + ".connector", "ODBC"),
|
|
config.getString(config_prefix + ".connection_string"))},
|
|
query_builder{dict_struct, db, table, where},
|
|
load_all_query{query_builder.composeLoadAllQuery()}
|
|
{}
|
|
|
|
/// copy-constructor is provided in order to support cloneability
|
|
ODBCDictionarySource(const ODBCDictionarySource & other)
|
|
: dict_struct{other.dict_struct},
|
|
db{other.db},
|
|
table{other.table},
|
|
where{other.where},
|
|
sample_block{other.sample_block},
|
|
pool{other.pool},
|
|
query_builder{dict_struct, db, table, where},
|
|
load_all_query{other.load_all_query}
|
|
{}
|
|
|
|
BlockInputStreamPtr loadAll() override
|
|
{
|
|
LOG_TRACE(log, load_all_query);
|
|
return new ODBCBlockInputStream{pool->get(), load_all_query, sample_block, max_block_size};
|
|
}
|
|
|
|
BlockInputStreamPtr loadIds(const std::vector<std::uint64_t> & ids) override
|
|
{
|
|
const auto query = query_builder.composeLoadIdsQuery(ids);
|
|
return new ODBCBlockInputStream{pool->get(), query, sample_block, max_block_size};
|
|
}
|
|
|
|
BlockInputStreamPtr loadKeys(
|
|
const ConstColumnPlainPtrs & key_columns, const std::vector<std::size_t> & requested_rows) override
|
|
{
|
|
const auto query = query_builder.composeLoadKeysQuery(key_columns, requested_rows, ExternalQueryBuilder::AND_OR_CHAIN);
|
|
return new ODBCBlockInputStream{pool->get(), query, sample_block, max_block_size};
|
|
}
|
|
|
|
bool isModified() const override
|
|
{
|
|
return true;
|
|
}
|
|
|
|
bool supportsSelectiveLoad() const override { return true; }
|
|
|
|
DictionarySourcePtr clone() const override { return std::make_unique<ODBCDictionarySource>(*this); }
|
|
|
|
std::string toString() const override
|
|
{
|
|
return "ODBC: " + db + '.' + table + (where.empty() ? "" : ", where: " + where);
|
|
}
|
|
|
|
private:
|
|
Logger * log = &Logger::get("ODBCDictionarySource");
|
|
|
|
const DictionaryStructure dict_struct;
|
|
const std::string db;
|
|
const std::string table;
|
|
const std::string where;
|
|
Block sample_block;
|
|
std::shared_ptr<Poco::Data::SessionPool> pool;
|
|
ExternalQueryBuilder query_builder;
|
|
const std::string load_all_query;
|
|
};
|
|
|
|
|
|
}
|