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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
#pragma once
#include <string>
#include <vector>
#include <stdexcept>
#include <chrono>
#include <memory>
namespace mapbox {
namespace sqlite {
enum OpenFlag : int {
ReadOnly = 0x00000001,
ReadWrite = 0x00000002,
Create = 0x00000004,
NoMutex = 0x00008000,
FullMutex = 0x00010000,
SharedCache = 0x00020000,
PrivateCache = 0x00040000,
};
enum class ResultCode : int {
OK = 0,
Error = 1,
Internal = 2,
Perm = 3,
Abort = 4,
Busy = 5,
Locked = 6,
NoMem = 7,
ReadOnly = 8,
Interrupt = 9,
IOErr = 10,
Corrupt = 11,
NotFound = 12,
Full = 13,
CantOpen = 14,
Protocol = 15,
Schema = 17,
TooBig = 18,
Constraint = 19,
Mismatch = 20,
Misuse = 21,
NoLFS = 22,
Auth = 23,
Range = 25,
NotADB = 26
};
class Exception : public std::runtime_error {
public:
Exception(int err, const char* msg)
: std::runtime_error(msg), code(static_cast<ResultCode>(err)) {
}
Exception(ResultCode err, const char* msg)
: std::runtime_error(msg), code(err) {
}
Exception(int err, const std::string& msg)
: std::runtime_error(msg), code(static_cast<ResultCode>(err)) {
}
Exception(ResultCode err, const std::string& msg)
: std::runtime_error(msg), code(err) {
}
const ResultCode code = ResultCode::OK;
};
class DatabaseImpl;
class Statement;
class StatementImpl;
class Query;
class Database {
private:
Database(const Database &) = delete;
Database &operator=(const Database &) = delete;
public:
Database(const std::string &filename, int flags = 0);
Database(Database &&);
~Database();
Database &operator=(Database &&);
void setBusyTimeout(std::chrono::milliseconds);
void exec(const std::string &sql);
private:
std::unique_ptr<DatabaseImpl> impl;
friend class Statement;
};
// A Statement object represents a prepared statement that can be run repeatedly run with a Query object.
class Statement {
public:
Statement(Database& db, const char* sql);
Statement(const Statement&) = delete;
Statement(Statement&&) = delete;
Statement& operator=(const Statement&) = delete;
Statement& operator=(Statement&&) = delete;
~Statement();
friend class Query;
private:
std::unique_ptr<StatementImpl> impl;
#ifndef NDEBUG
// This flag stores whether there exists a Query object that uses this prepared statement.
// There may only be one Query object at a time. Statement objects must outlive Query objects.
// While a Query object exists, a Statement object may not be moved or deleted.
bool used = false;
#endif
};
// A Query object is used to run a database query with a prepared statement (stored in a Statement
// object). There may only exist one Query object per Statement object. Query objects are designed
// to be constructed and destroyed frequently.
class Query {
public:
Query(Statement&);
Query(const Query&) = delete;
Query(Query&&) = delete;
Query& operator=(const Query&) = delete;
Query& operator=(Query&&) = delete;
~Query();
template <typename T>
void bind(int offset, T value);
// Text
void bind(int offset, const char*, std::size_t length, bool retain = true);
void bind(int offset, const std::string&, bool retain = true);
// Blob
void bindBlob(int offset, const void*, std::size_t length, bool retain = true);
void bindBlob(int offset, const std::vector<uint8_t>&, bool retain = true);
template <typename T>
T get(int offset);
bool run();
void reset();
void clearBindings();
int64_t lastInsertRowId() const;
uint64_t changes() const;
private:
Statement& stmt;
};
class Transaction {
private:
Transaction(const Transaction&) = delete;
Transaction(Transaction&&) = delete;
Transaction& operator=(const Transaction&) = delete;
public:
enum Mode {
Deferred,
Immediate,
Exclusive
};
Transaction(Database&, Mode = Deferred);
~Transaction();
void commit();
void rollback();
private:
Database& db;
bool needRollback = true;
};
}
}
|
