1#pragma once
2
3#include <Core/Block.h>
4
5#include "config_core.h"
6#if USE_MYSQL
7
8# include <common/LocalDateTime.h>
9# include <mysqlxx/PoolWithFailover.h>
10# include "DictionaryStructure.h"
11# include "ExternalQueryBuilder.h"
12# include "IDictionarySource.h"
13
14
15namespace Poco
16{
17class Logger;
18
19namespace Util
20{
21 class AbstractConfiguration;
22}
23}
24
25
26namespace DB
27{
28/// Allows loading dictionaries from a MySQL database
29class MySQLDictionarySource final : public IDictionarySource
30{
31public:
32 MySQLDictionarySource(
33 const DictionaryStructure & dict_struct_,
34 const Poco::Util::AbstractConfiguration & config,
35 const std::string & config_prefix,
36 const Block & sample_block_);
37
38 /// copy-constructor is provided in order to support cloneability
39 MySQLDictionarySource(const MySQLDictionarySource & other);
40 MySQLDictionarySource & operator=(const MySQLDictionarySource &) = delete;
41
42 BlockInputStreamPtr loadAll() override;
43
44 BlockInputStreamPtr loadUpdatedAll() override;
45
46 BlockInputStreamPtr loadIds(const std::vector<UInt64> & ids) override;
47
48 BlockInputStreamPtr loadKeys(const Columns & key_columns, const std::vector<size_t> & requested_rows) override;
49
50 bool isModified() const override;
51
52 bool supportsSelectiveLoad() const override;
53
54 bool hasUpdateField() const override;
55
56 DictionarySourcePtr clone() const override;
57
58 std::string toString() const override;
59
60private:
61 std::string getUpdateFieldAndDate();
62
63 static std::string quoteForLike(const std::string s);
64
65 LocalDateTime getLastModification() const;
66
67 // execute invalidate_query. expects single cell in result
68 std::string doInvalidateQuery(const std::string & request) const;
69
70 Poco::Logger * log;
71
72 std::chrono::time_point<std::chrono::system_clock> update_time;
73 const DictionaryStructure dict_struct;
74 const std::string db;
75 const std::string table;
76 const std::string where;
77 const std::string update_field;
78 const bool dont_check_update_time;
79 Block sample_block;
80 mutable mysqlxx::PoolWithFailover pool;
81 ExternalQueryBuilder query_builder;
82 const std::string load_all_query;
83 LocalDateTime last_modification;
84 std::string invalidate_query;
85 mutable std::string invalidate_query_response;
86 const bool close_connection;
87};
88
89}
90
91#endif
92