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#pragma once
#include <Core/Block.h>
#include "clickhouse_config.h"
#if USE_MYSQL
# include <Common/LocalDateTime.h>
# error #include <mysqlxx/PoolWithFailover.h>
# include "DictionaryStructure.h"
# include "ExternalQueryBuilder.h"
# include "IDictionarySource.h"
# error #include <Processors/Sources/MySQLSource.h>
namespace Poco
{
class Logger;
namespace Util
{
class AbstractConfiguration;
}
}
namespace DB
{
/// Allows loading dictionaries from a MySQL database
class MySQLDictionarySource final : public IDictionarySource
{
public:
struct Configuration
{
const std::string db;
const std::string table;
const std::string query;
const std::string where;
const std::string invalidate_query;
const std::string update_field;
const UInt64 update_lag;
const bool dont_check_update_time;
};
MySQLDictionarySource(
const DictionaryStructure & dict_struct_,
const Configuration & configuration_,
mysqlxx::PoolWithFailoverPtr pool_,
const Block & sample_block_,
const StreamSettings & settings_);
/// copy-constructor is provided in order to support cloneability
MySQLDictionarySource(const MySQLDictionarySource & other);
MySQLDictionarySource & operator=(const MySQLDictionarySource &) = delete;
QueryPipeline loadAll() override;
QueryPipeline loadUpdatedAll() override;
QueryPipeline loadIds(const std::vector<UInt64> & ids) override;
QueryPipeline 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:
QueryPipeline loadFromQuery(const String & query);
std::string getUpdateFieldAndDate();
static std::string quoteForLike(const std::string & value);
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 Configuration configuration;
mysqlxx::PoolWithFailoverPtr pool;
Block sample_block;
ExternalQueryBuilder query_builder;
const std::string load_all_query;
LocalDateTime last_modification;
mutable std::string invalidate_query_response;
const StreamSettings settings;
};
}
#endif
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