diff options
Diffstat (limited to 'hkutil/database.h')
-rw-r--r-- | hkutil/database.h | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/hkutil/database.h b/hkutil/database.h new file mode 100644 index 0000000..c15fa52 --- /dev/null +++ b/hkutil/database.h | |||
@@ -0,0 +1,213 @@ | |||
1 | #ifndef DATABASE_H_0B0A47D2 | ||
2 | #define DATABASE_H_0B0A47D2 | ||
3 | |||
4 | #include <sqlite3.h> | ||
5 | #include <fstream> | ||
6 | #include <sstream> | ||
7 | #include <string> | ||
8 | #include <stdexcept> | ||
9 | #include <list> | ||
10 | #include <memory> | ||
11 | #include "../vendor/variant.hpp" | ||
12 | #include "string.h" | ||
13 | |||
14 | namespace hatkirby { | ||
15 | |||
16 | class sqlite3_error : public std::runtime_error { | ||
17 | public: | ||
18 | |||
19 | sqlite3_error( | ||
20 | const std::string& what, | ||
21 | sqlite3* ppdb) | ||
22 | : std::runtime_error(generateWhat(what, ppdb)) | ||
23 | { | ||
24 | } | ||
25 | |||
26 | private: | ||
27 | |||
28 | static std::string generateWhat( | ||
29 | const std::string& what, | ||
30 | sqlite3* ppdb) | ||
31 | { | ||
32 | std::string errmsg(sqlite3_errmsg(ppdb)); | ||
33 | |||
34 | return what + " (" + errmsg + ")"; | ||
35 | } | ||
36 | |||
37 | }; | ||
38 | |||
39 | enum class dbmode { | ||
40 | read, | ||
41 | readwrite, | ||
42 | create | ||
43 | }; | ||
44 | |||
45 | using binding = | ||
46 | mpark::variant< | ||
47 | std::string, | ||
48 | int>; | ||
49 | |||
50 | using column = | ||
51 | std::tuple< | ||
52 | std::string, | ||
53 | binding>; | ||
54 | |||
55 | class database { | ||
56 | public: | ||
57 | |||
58 | // Constructor | ||
59 | |||
60 | explicit database( | ||
61 | std::string path, | ||
62 | dbmode mode) | ||
63 | { | ||
64 | if (mode == dbmode::create) | ||
65 | { | ||
66 | // If there is already a file at this path, overwrite it. | ||
67 | if (std::ifstream(path)) | ||
68 | { | ||
69 | if (std::remove(path.c_str())) | ||
70 | { | ||
71 | throw std::logic_error("Could not overwrite file at path"); | ||
72 | } | ||
73 | } | ||
74 | } | ||
75 | |||
76 | sqlite3* tempDb; | ||
77 | |||
78 | int flags; | ||
79 | |||
80 | if (mode == dbmode::read) | ||
81 | { | ||
82 | flags = SQLITE_OPEN_READONLY; | ||
83 | } else { | ||
84 | flags = SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE; | ||
85 | } | ||
86 | |||
87 | int ret = sqlite3_open_v2( | ||
88 | path.c_str(), | ||
89 | &tempDb, | ||
90 | flags, | ||
91 | NULL); | ||
92 | |||
93 | ppdb_ = ppdb_type(tempDb); | ||
94 | |||
95 | if (ret != SQLITE_OK) | ||
96 | { | ||
97 | throw sqlite3_error("Could not create output datafile", ppdb_.get()); | ||
98 | } | ||
99 | } | ||
100 | |||
101 | // Actions | ||
102 | |||
103 | void execute(std::string query) | ||
104 | { | ||
105 | sqlite3_stmt* ppstmt; | ||
106 | |||
107 | if (sqlite3_prepare_v2( | ||
108 | ppdb_.get(), | ||
109 | query.c_str(), | ||
110 | query.length(), | ||
111 | &ppstmt, | ||
112 | NULL) != SQLITE_OK) | ||
113 | { | ||
114 | throw sqlite3_error("Error writing to database", ppdb_.get()); | ||
115 | } | ||
116 | |||
117 | int result = sqlite3_step(ppstmt); | ||
118 | sqlite3_finalize(ppstmt); | ||
119 | |||
120 | if (result != SQLITE_DONE) | ||
121 | { | ||
122 | throw sqlite3_error("Error writing to database", ppdb_.get()); | ||
123 | } | ||
124 | } | ||
125 | |||
126 | void insertIntoTable( | ||
127 | std::string table, | ||
128 | std::list<column> columns) | ||
129 | { | ||
130 | std::list<std::string> fieldNames; | ||
131 | std::list<std::string> qs; | ||
132 | |||
133 | for (const column& c : columns) | ||
134 | { | ||
135 | fieldNames.push_back(std::get<0>(c)); | ||
136 | qs.push_back("?"); | ||
137 | } | ||
138 | |||
139 | std::ostringstream query; | ||
140 | query << "INSERT INTO "; | ||
141 | query << table; | ||
142 | query << " ("; | ||
143 | query << implode(std::begin(fieldNames), std::end(fieldNames), ", "); | ||
144 | query << ") VALUES ("; | ||
145 | query << implode(std::begin(qs), std::end(qs), ", "); | ||
146 | query << ")"; | ||
147 | |||
148 | std::string query_str = query.str(); | ||
149 | |||
150 | sqlite3_stmt* ppstmt; | ||
151 | |||
152 | if (sqlite3_prepare_v2( | ||
153 | ppdb_.get(), | ||
154 | query_str.c_str(), | ||
155 | query_str.length(), | ||
156 | &ppstmt, | ||
157 | NULL) != SQLITE_OK) | ||
158 | { | ||
159 | throw sqlite3_error("Error writing to database", ppdb_.get()); | ||
160 | } | ||
161 | |||
162 | int i = 1; | ||
163 | for (const column& c : columns) | ||
164 | { | ||
165 | const binding& b = std::get<1>(c); | ||
166 | |||
167 | if (mpark::holds_alternative<int>(b)) | ||
168 | { | ||
169 | sqlite3_bind_int(ppstmt, i, mpark::get<int>(b)); | ||
170 | } else if (mpark::holds_alternative<std::string>(b)) | ||
171 | { | ||
172 | const std::string& arg = mpark::get<std::string>(b); | ||
173 | |||
174 | sqlite3_bind_text( | ||
175 | ppstmt, | ||
176 | i, | ||
177 | arg.c_str(), | ||
178 | arg.length(), | ||
179 | SQLITE_TRANSIENT); | ||
180 | } | ||
181 | |||
182 | i++; | ||
183 | } | ||
184 | |||
185 | int result = sqlite3_step(ppstmt); | ||
186 | sqlite3_finalize(ppstmt); | ||
187 | |||
188 | if (result != SQLITE_DONE) | ||
189 | { | ||
190 | throw sqlite3_error("Error writing to database", ppdb_.get()); | ||
191 | } | ||
192 | } | ||
193 | |||
194 | private: | ||
195 | |||
196 | class sqlite3_deleter { | ||
197 | public: | ||
198 | |||
199 | void operator()(sqlite3* ptr) const | ||
200 | { | ||
201 | sqlite3_close_v2(ptr); | ||
202 | } | ||
203 | }; | ||
204 | |||
205 | using ppdb_type = std::unique_ptr<sqlite3, sqlite3_deleter>; | ||
206 | |||
207 | ppdb_type ppdb_; | ||
208 | |||
209 | }; | ||
210 | |||
211 | }; | ||
212 | |||
213 | #endif /* end of include guard: DATABASE_H_0B0A47D2 */ | ||