ClickHouse/src/Dictionaries/MySQLDictionarySource.h
2020-04-16 15:31:57 +03:00

94 lines
2.4 KiB
C++

#pragma once
#include <Core/Block.h>
#if !defined(ARCADIA_BUILD)
# include "config_core.h"
#endif
#if USE_MYSQL
# include <common/LocalDateTime.h>
# include <mysqlxx/PoolWithFailover.h>
# include "DictionaryStructure.h"
# include "ExternalQueryBuilder.h"
# include "IDictionarySource.h"
namespace Poco
{
class Logger;
namespace Util
{
class AbstractConfiguration;
}
}
namespace DB
{
/// Allows loading dictionaries from a MySQL database
class MySQLDictionarySource final : public IDictionarySource
{
public:
MySQLDictionarySource(
const DictionaryStructure & dict_struct_,
const Poco::Util::AbstractConfiguration & config,
const std::string & config_prefix,
const Block & sample_block_);
/// copy-constructor is provided in order to support cloneability
MySQLDictionarySource(const MySQLDictionarySource & other);
MySQLDictionarySource & operator=(const MySQLDictionarySource &) = delete;
BlockInputStreamPtr loadAll() override;
BlockInputStreamPtr loadUpdatedAll() override;
BlockInputStreamPtr loadIds(const std::vector<UInt64> & ids) override;
BlockInputStreamPtr loadKeys(const Columns & key_columns, const std::vector<size_t> & requested_rows) override;
bool isModified() const override;
bool supportsSelectiveLoad() const override;
bool hasUpdateField() const override;
DictionarySourcePtr clone() const override;
std::string toString() const override;
private:
std::string getUpdateFieldAndDate();
static std::string quoteForLike(const std::string s);
LocalDateTime getLastModification(mysqlxx::Pool::Entry & connection, bool allow_connection_closure) const;
// execute invalidate_query. expects single cell in result
std::string doInvalidateQuery(const std::string & request) const;
Poco::Logger * log;
std::chrono::time_point<std::chrono::system_clock> update_time;
const DictionaryStructure dict_struct;
const std::string db;
const std::string table;
const std::string where;
const std::string update_field;
const bool dont_check_update_time;
Block sample_block;
mutable mysqlxx::PoolWithFailover pool;
ExternalQueryBuilder query_builder;
const std::string load_all_query;
LocalDateTime last_modification;
std::string invalidate_query;
mutable std::string invalidate_query_response;
const bool close_connection;
};
}
#endif