~singpolyma/biboumi

ref: b4b9828de50c09fea5503b3b3ead2ae9d5144404 biboumi/src/database/insert_query.hpp -rw-r--r-- 3.5 KiB
b4b9828d — louiz’ Follow log_level even when using journald output 4 years ago
                                                                                
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
#pragma once

#include <database/statement.hpp>
#include <database/column.hpp>
#include <database/query.hpp>
#include <logger/logger.hpp>

#include <type_traits>
#include <vector>
#include <string>
#include <tuple>

template <std::size_t N=0, typename... T>
typename std::enable_if<N < sizeof...(T), void>::type
update_autoincrement_id(std::tuple<T...>& columns, Statement& statement)
{
  using ColumnType = typename std::decay<decltype(std::get<N>(columns))>::type;
  if (std::is_same<ColumnType, Id>::value)
    {
      log_debug("EXTRACTING LAST ID");
      auto&& column = std::get<Id>(columns);
    }
  update_autoincrement_id<N+1>(columns, statement);
}

template <std::size_t N=0, typename... T>
typename std::enable_if<N == sizeof...(T), void>::type
update_autoincrement_id(std::tuple<T...>&, Statement& statement)
{}

struct InsertQuery: public Query
{
  template <typename... T>
  InsertQuery(const std::string& name, const std::tuple<T...>& columns):
      Query("INSERT INTO ")
  {
    this->body += name;
    this->insert_col_names(columns);
    this->insert_values(columns);
  }

  template <typename... T>
  void execute(DatabaseEngine& db, std::tuple<T...>& columns)
  {
    auto statement = db.prepare(this->body);
    this->bind_param(columns, *statement);

    if (statement->step() != StepResult::Error)
      db.extract_last_insert_rowid(*statement);
    else
      log_error("Failed to extract the rowid from the last INSERT");
  }

  template <int N=0, typename... T>
  typename std::enable_if<N < sizeof...(T), void>::type
  bind_param(const std::tuple<T...>& columns, Statement& statement, int index=1)
  {
    auto&& column = std::get<N>(columns);
    using ColumnType = std::decay_t<decltype(column)>;

    if (!std::is_same<ColumnType, Id>::value)
      actual_bind(statement, column.value, index++);

    this->bind_param<N+1>(columns, statement, index);
  }

  template <int N=0, typename... T>
  typename std::enable_if<N == sizeof...(T), void>::type
  bind_param(const std::tuple<T...>&, Statement&, int)
  {}

  template <typename... T>
  void insert_values(const std::tuple<T...>& columns)
  {
    this->body += "VALUES (";
    this->insert_value(columns);
    this->body += ")";
  }

  template <int N=0, typename... T>
  typename std::enable_if<N < sizeof...(T), void>::type
  insert_value(const std::tuple<T...>& columns, int index=1)
  {
    using ColumnType = std::decay_t<decltype(std::get<N>(columns))>;

    if (!std::is_same<ColumnType, Id>::value)
      {
        this->body += "$" + std::to_string(index++);
        if (N != sizeof...(T) - 1)
          this->body += ", ";
      }
    this->insert_value<N+1>(columns, index);
  }
  template <int N=0, typename... T>
  typename std::enable_if<N == sizeof...(T), void>::type
  insert_value(const std::tuple<T...>&, const int)
  { }

  template <typename... T>
  void insert_col_names(const std::tuple<T...>& columns)
  {
    this->body += " (";
    this->insert_col_name(columns);
    this->body += ")";
  }

  template <int N=0, typename... T>
  typename std::enable_if<N < sizeof...(T), void>::type
  insert_col_name(const std::tuple<T...>& columns)
  {
    using ColumnType = std::decay_t<decltype(std::get<N>(columns))>;

    if (!std::is_same<ColumnType, Id>::value)
      {
        this->body += ColumnType::name;

        if (N < (sizeof...(T) - 1))
          this->body += ", ";
      }

    this->insert_col_name<N+1>(columns);
  }

  template <int N=0, typename... T>
  typename std::enable_if<N == sizeof...(T), void>::type
  insert_col_name(const std::tuple<T...>&)
  {}
};