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#pragma once
#include "clickhouse_config.h"
#include "DictionaryStructure.h"
#include "IDictionarySource.h"
#if USE_LIBPQXX
#include "ExternalQueryBuilder.h"
#include <Core/Block.h>
#include <Common/LocalDateTime.h>
#include <Core/PostgreSQL/PoolWithFailover.h>
namespace DB
{
/// Allows loading dictionaries from a PostgreSQL database
class PostgreSQLDictionarySource final : public IDictionarySource
{
public:
struct Configuration
{
const String db;
const String schema;
const String table;
const String query;
const String where;
const String invalidate_query;
const String update_field;
const UInt64 update_lag;
};
PostgreSQLDictionarySource(
const DictionaryStructure & dict_struct_,
const Configuration & configuration_,
postgres::PoolWithFailoverPtr pool_,
const Block & sample_block_);
/// copy-constructor is provided in order to support cloneability
PostgreSQLDictionarySource(const PostgreSQLDictionarySource & other);
PostgreSQLDictionarySource & operator=(const PostgreSQLDictionarySource &) = 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:
String getUpdateFieldAndDate();
String doInvalidateQuery(const std::string & request) const;
QueryPipeline loadBase(const String & query);
const DictionaryStructure dict_struct;
const Configuration configuration;
postgres::PoolWithFailoverPtr pool;
Block sample_block;
Poco::Logger * log;
ExternalQueryBuilder query_builder;
const std::string load_all_query;
std::chrono::time_point<std::chrono::system_clock> update_time;
mutable std::string invalidate_query_response;
};
}
#endif
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