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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
module;
#include <sqlite3.h>
module routemon:sqlite3$impl;
import :sqlite3;
namespace routemon::sqlite3 {
mutex_guard::mutex_guard(::sqlite3_mutex* mut) noexcept : mut_{mut} {}
mutex_guard::~mutex_guard() { ::sqlite3_mutex_leave(mut_); }
auto do_guarded(::sqlite3_mutex* mut, std::invocable<mutex_guard const&> auto f)
-> decltype(f(std::declval<mutex_guard const&>()))
{
return f(mutex_guard{mut});
}
auto do_guarded(::sqlite3* dbc, std::invocable<mutex_guard const&> auto f)
-> decltype(f(std::declval<mutex_guard const&>()))
{
return do_guarded(::sqlite3_db_mutex(dbc), f);
}
error::error(mutex_guard const&, int code, ::sqlite3* dbc)
: code_{code}, message_{::sqlite3_errmsg(dbc)}
{
}
error::error(int code) : code_{code}, message_{::sqlite3_errstr(code)} {}
[[nodiscard]] auto error::what() const noexcept -> char const*
{
return message_.c_str();
}
[[nodiscard]] auto error::code() const noexcept -> int { return code_; }
statement::statement(::sqlite3_stmt* stmt) : stmt_{stmt} {}
statement::statement(statement&& s) noexcept
{
stmt_ = s.stmt_;
s.stmt_ = nullptr;
}
statement::~statement() { ::sqlite3_finalize(stmt_); }
auto statement::get() -> ::sqlite3_stmt* { return stmt_; }
row_reader::row_reader(statement stmt) : stmt_{std::move(stmt)} {}
auto row_reader::is_null(int col) -> bool
{
return ::sqlite3_column_type(stmt_.get(), col) == SQLITE_NULL;
}
auto row_reader::ncols() -> std::size_t
{
auto const mncols = util::size_from_int(::sqlite3_data_count(stmt_.get()));
if (!mncols.has_value())
throw std::logic_error{"got unexpected negative amount of columns"};
return *mncols;
}
auto row_reader::scan(int col, std::string& s) -> void
{
if (::sqlite3_column_type(stmt_.get(), col) != SQLITE_TEXT)
throw std::invalid_argument{"invalid type for scan"};
unsigned char const* chs = ::sqlite3_column_text(stmt_.get(), col);
auto size = util::size_from_int(::sqlite3_column_bytes(stmt_.get(), col));
if (!size.has_value())
throw std::logic_error{"unexpected negative amount of bytes in column"};
s = std::string{reinterpret_cast<char const*>(chs), *size};
}
auto row_reader::scan(int col, double& v) -> void
{
if (::sqlite3_column_type(stmt_.get(), col) != SQLITE_FLOAT)
throw std::invalid_argument{"invalid type for scan"};
v = ::sqlite3_column_double(stmt_.get(), col);
}
auto row_reader::scan(int col, std::int64_t& v) -> void
{
if (::sqlite3_column_type(stmt_.get(), col) != SQLITE_INTEGER)
throw std::invalid_argument{"invalid type for scan"};
v = ::sqlite3_column_int64(stmt_.get(), col);
}
auto row_reader::next() -> bool
{
::sqlite3* dbc = ::sqlite3_db_handle(stmt_.get());
return do_guarded(
dbc,
[&](auto const& guard) -> bool
{
auto const s = ::sqlite3_step(stmt_.get());
if (s == SQLITE_ROW)
return true;
if (s == SQLITE_DONE)
return false;
throw error{guard, s, dbc};
});
}
binder::binder(statement& stmt) : stmt_{stmt} {}
auto binder::text(std::string const& param_name, std::string_view str) -> void
{
int const i = ::sqlite3_bind_parameter_index(stmt_.get(), param_name.c_str());
if (i == 0)
throw std::invalid_argument{std::format(
"bind: no parameter with name {} found", param_name)};
auto str_size = util::int_from_size(str.size());
if (!str_size.has_value())
throw std::invalid_argument{"bind: provided text is too long"};
if (auto s = ::sqlite3_bind_text(
stmt_.get(), i, str.data(), *str_size, SQLITE_TRANSIENT);
s != SQLITE_OK)
{
throw error{s};
}
}
auto binder::noop(binder&) -> void {}
connection::connection(::sqlite3* dbc)
: dbc_{dbc}, mut_{::sqlite3_db_mutex(dbc)}
{
}
connection::connection(connection const&) = delete;
connection::connection(connection&& c) noexcept
{
dbc_ = c.dbc_;
mut_ = c.mut_;
c.dbc_ = nullptr;
c.mut_ = nullptr;
}
auto connection::query(
std::string const& sql, std::function<void(binder&)> const& bf)
-> row_reader
{
::sqlite3_stmt* pstmt = nullptr;
char const* sql_tail = nullptr;
auto sql_size = util::int_from_size(sql.size());
if (!sql_size.has_value() || *sql_size >= std::numeric_limits<int>::max() - 1)
throw std::invalid_argument{"provided input text too large"};
do_guarded(
mut_,
[&](auto const& guard) -> void
{
if (auto s = ::sqlite3_prepare_v2(
dbc_, sql.data(), *sql_size + 1, &pstmt, &sql_tail);
s != SQLITE_OK)
{
if (pstmt != nullptr)
{
// Use contract_assert when having a compiler with
// contracts available
::sqlite3_finalize(pstmt);
throw std::logic_error{
"expected stmt to be null after failed preparation"
};
}
throw error{guard, s, dbc_};
}
});
if (!pstmt)
throw std::invalid_argument{"provided input text contains no SQL"};
auto stmt = statement{pstmt};
if (sql_tail && std::strlen(sql_tail) > 0)
throw std::invalid_argument{
"provided input text contains more than one SQL statement"
};
auto b = binder{stmt};
bf(b);
return row_reader{std::move(stmt)};
}
auto connection::exec(
std::string const& sql, std::function<void(binder&)> const& bf) -> void
{
auto reader = query(sql, bf);
while (reader.next())
;
}
connection::~connection()
{
std::ignore = ::sqlite3_close(std::exchange(dbc_, nullptr));
}
auto open(std::string const& filename) -> connection
{
::sqlite3* dbc = nullptr;
auto s = ::sqlite3_open_v2(
filename.c_str(), &dbc,
SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | SQLITE_OPEN_FULLMUTEX
| SQLITE_OPEN_EXRESCODE,
nullptr);
if (s != SQLITE_OK)
{
if (dbc)
{
do_guarded(
dbc, [&](auto const& guard) -> void { throw error{guard, s, dbc}; });
}
else
{
throw error{s};
}
}
return connection{dbc};
}
} // namespace routemon::sqlite3
|
