MPD 0.20.6

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Util.hxx
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1 /*
2 * Copyright 2003-2017 The Music Player Daemon Project
3 * http://www.musicpd.org
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #ifndef MPD_SQLITE_UTIL_HXX
21 #define MPD_SQLITE_UTIL_HXX
22
23 #include "Error.hxx"
24
25 #include <sqlite3.h>
26
27 #include <assert.h>
28
32 static void
33 Bind(sqlite3_stmt *stmt, unsigned i, const char *value)
34 {
35 int result = sqlite3_bind_text(stmt, i, value, -1, nullptr);
36 if (result != SQLITE_OK)
37 throw SqliteError(stmt, result, "sqlite3_bind_text() failed");
38 }
39
40 template<typename... Args>
41 static void
42 BindAll2(gcc_unused sqlite3_stmt *stmt, gcc_unused unsigned i)
43 {
44 assert(int(i - 1) == sqlite3_bind_parameter_count(stmt));
45 }
46
47 template<typename... Args>
48 static void
49 BindAll2(sqlite3_stmt *stmt, unsigned i,
50 const char *value, Args&&... args)
51 {
52 Bind(stmt, i, value);
53 BindAll2(stmt, i + 1, std::forward<Args>(args)...);
54 }
55
59 template<typename... Args>
60 static void
61 BindAll(sqlite3_stmt *stmt, Args&&... args)
62 {
63 assert(int(sizeof...(args)) == sqlite3_bind_parameter_count(stmt));
64
65 BindAll2(stmt, 1, std::forward<Args>(args)...);
66 }
67
72 static int
73 ExecuteBusy(sqlite3_stmt *stmt)
74 {
75 int result;
76 do {
77 result = sqlite3_step(stmt);
78 } while (result == SQLITE_BUSY);
79
80 return result;
81 }
82
88 static bool
89 ExecuteRow(sqlite3_stmt *stmt)
90 {
91 int result = ExecuteBusy(stmt);
92 if (result == SQLITE_ROW)
93 return true;
94
95 if (result != SQLITE_DONE)
96 throw SqliteError(stmt, result, "sqlite3_step() failed");
97
98 return false;
99 }
100
107 static void
108 ExecuteCommand(sqlite3_stmt *stmt)
109 {
110 int result = ExecuteBusy(stmt);
111 if (result != SQLITE_DONE)
112 throw SqliteError(stmt, result, "sqlite3_step() failed");
113 }
114
121 static inline unsigned
122 ExecuteChanges(sqlite3_stmt *stmt)
123 {
124 ExecuteCommand(stmt);
125
126 return sqlite3_changes(sqlite3_db_handle(stmt));
127 }
128
135 static inline bool
136 ExecuteModified(sqlite3_stmt *stmt)
137 {
138 return ExecuteChanges(stmt) > 0;
139 }
140
141 template<typename F>
142 static inline void
143 ExecuteForEach(sqlite3_stmt *stmt, F &&f)
144 {
145 while (true) {
146 int result = ExecuteBusy(stmt);
147 switch (result) {
148 case SQLITE_ROW:
149 f();
150 break;
151
152 case SQLITE_DONE:
153 return;
154
155 default:
156 throw SqliteError(stmt, result, "sqlite3_step() failed");
157 }
158 }
159 }
160
161 #endif
ExecuteChanges
static unsigned ExecuteChanges(sqlite3_stmt *stmt)
Wrapper for ExecuteCommand() that returns the number of rows modified via sqlite3_changes().
Definition: Util.hxx:122
ExecuteCommand
static void ExecuteCommand(sqlite3_stmt *stmt)
Wrapper for ExecuteBusy() that interprets everything other than SQLITE_DONE as error.
Definition: Util.hxx:108
Error.hxx
ExecuteBusy
static int ExecuteBusy(sqlite3_stmt *stmt)
Call sqlite3_stmt() repepatedly until something other than SQLITE_BUSY is returned.
Definition: Util.hxx:73
Bind
static void Bind(sqlite3_stmt *stmt, unsigned i, const char *value)
Throws SqliteError on error.
Definition: Util.hxx:33
ExecuteForEach
static void ExecuteForEach(sqlite3_stmt *stmt, F &&f)
Definition: Util.hxx:143
ExecuteModified
static bool ExecuteModified(sqlite3_stmt *stmt)
Wrapper for ExecuteChanges() that returns true if at least one row was modified.
Definition: Util.hxx:136
SqliteError
Definition: Error.hxx:28
ExecuteRow
static bool ExecuteRow(sqlite3_stmt *stmt)
Wrapper for ExecuteBusy() that returns true on SQLITE_ROW.
Definition: Util.hxx:89
gcc_unused
#define gcc_unused
Definition: Compiler.h:118
BindAll2
static void BindAll2(gcc_unused sqlite3_stmt *stmt, gcc_unused unsigned i)
Definition: Util.hxx:42
BindAll
static void BindAll(sqlite3_stmt *stmt, Args &&...args)
Throws SqliteError on error.
Definition: Util.hxx:61