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https://github.com/ClickHouse/ClickHouse.git
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94 lines
2.4 KiB
C++
94 lines
2.4 KiB
C++
#pragma once
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#include <Core/Block.h>
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#if !defined(ARCADIA_BUILD)
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# include "config_core.h"
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#endif
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#if USE_MYSQL
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# include <common/LocalDateTime.h>
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# include <mysqlxx/PoolWithFailover.h>
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# include "DictionaryStructure.h"
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# include "ExternalQueryBuilder.h"
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# include "IDictionarySource.h"
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namespace Poco
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{
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class Logger;
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namespace Util
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{
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class AbstractConfiguration;
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}
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}
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namespace DB
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{
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/// Allows loading dictionaries from a MySQL database
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class MySQLDictionarySource final : public IDictionarySource
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{
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public:
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MySQLDictionarySource(
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const DictionaryStructure & dict_struct_,
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const Poco::Util::AbstractConfiguration & config,
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const std::string & config_prefix,
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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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MySQLDictionarySource(const MySQLDictionarySource & other);
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MySQLDictionarySource & operator=(const MySQLDictionarySource &) = delete;
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BlockInputStreamPtr loadAll() override;
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BlockInputStreamPtr loadUpdatedAll() override;
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BlockInputStreamPtr loadIds(const std::vector<UInt64> & ids) override;
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BlockInputStreamPtr 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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std::string getUpdateFieldAndDate();
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static std::string quoteForLike(const std::string s);
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LocalDateTime getLastModification(mysqlxx::Pool::Entry & connection, bool allow_connection_closure) const;
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// execute invalidate_query. expects single cell in result
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std::string doInvalidateQuery(const std::string & request) const;
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Poco::Logger * log;
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std::chrono::time_point<std::chrono::system_clock> update_time;
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const DictionaryStructure dict_struct;
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const std::string db;
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const std::string table;
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const std::string where;
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const std::string update_field;
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const bool dont_check_update_time;
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Block sample_block;
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mutable mysqlxx::PoolWithFailover pool;
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ExternalQueryBuilder query_builder;
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const std::string load_all_query;
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LocalDateTime last_modification;
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std::string invalidate_query;
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mutable std::string invalidate_query_response;
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const bool close_connection;
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};
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}
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#endif
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