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75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
#pragma once
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#include "config_core.h"
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#include "DictionaryStructure.h"
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#include "IDictionarySource.h"
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#if USE_LIBPQXX
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#include "ExternalQueryBuilder.h"
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#include <Core/Block.h>
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#include <base/LocalDateTime.h>
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#include <base/logger_useful.h>
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#include <Core/PostgreSQL/PoolWithFailover.h>
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namespace DB
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{
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/// Allows loading dictionaries from a PostgreSQL database
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class PostgreSQLDictionarySource final : public IDictionarySource
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{
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public:
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struct Configuration
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{
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const String db;
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const String schema;
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const String table;
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const String query;
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const String where;
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const String invalidate_query;
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const String update_field;
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const UInt64 update_lag;
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};
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PostgreSQLDictionarySource(
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const DictionaryStructure & dict_struct_,
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const Configuration & configuration_,
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postgres::PoolWithFailoverPtr pool_,
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const Block & sample_block_);
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/// copy-constructor is provided in order to support cloneability
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PostgreSQLDictionarySource(const PostgreSQLDictionarySource & other);
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PostgreSQLDictionarySource & operator=(const PostgreSQLDictionarySource &) = delete;
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Pipe loadAll() override;
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Pipe loadUpdatedAll() override;
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Pipe loadIds(const std::vector<UInt64> & ids) override;
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Pipe loadKeys(const Columns & key_columns, const std::vector<size_t> & requested_rows) override;
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bool isModified() const override;
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bool supportsSelectiveLoad() const override;
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bool hasUpdateField() const override;
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DictionarySourcePtr clone() const override;
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std::string toString() const override;
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private:
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String getUpdateFieldAndDate();
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String doInvalidateQuery(const std::string & request) const;
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Pipe loadBase(const String & query);
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const DictionaryStructure dict_struct;
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const Configuration configuration;
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postgres::PoolWithFailoverPtr pool;
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Block sample_block;
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Poco::Logger * log;
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ExternalQueryBuilder query_builder;
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const std::string load_all_query;
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std::chrono::time_point<std::chrono::system_clock> update_time;
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mutable std::string invalidate_query_response;
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};
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}
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#endif
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