aboutsummaryrefslogtreecommitdiff
path: root/src/include/gnunet_mysql_lib.h
blob: 843d3ccb378bf1ee9634481cd5d76f8e1930c5c4 (plain) (blame)
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
/*
     This file is part of GNUnet
     Copyright (C) 2012 GNUnet e.V.

     GNUnet is free software: you can redistribute it and/or modify it
     under the terms of the GNU Affero General Public License as published
     by the Free Software Foundation, either version 3 of the License,
     or (at your option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Affero General Public License for more details.

     You should have received a copy of the GNU Affero General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.

     SPDX-License-Identifier: AGPL3.0-or-later
 */
/**
 * @author Christian Grothoff
 *
 * @file
 * Helper library to access a MySQL database
 *
 * @defgroup mysql  MySQL library
 * Helper library to access a MySQL database.
 * @{
 */
#ifndef GNUNET_MYSQL_LIB_H
#define GNUNET_MYSQL_LIB_H

#include "gnunet_util_lib.h"
#include <mysql/mysql.h>

#ifdef __cplusplus
extern "C"
{
#if 0                           /* keep Emacsens' auto-indent happy */
}
#endif
#endif

#ifdef HAVE_MYSQL8
  typedef bool MYSQL_BOOL;
#else
  typedef my_bool MYSQL_BOOL; //MySQL < 8 wants this
#endif


/**
 * Mysql context.
 */
struct GNUNET_MYSQL_Context;


/**
 * Handle for a prepared statement.
 */
struct GNUNET_MYSQL_StatementHandle;


/**
 * Type of a callback that will be called for each
 * data set returned from MySQL.
 *
 * @param cls user-defined argument
 * @param num_values number of elements in values
 * @param values values returned by MySQL
 * @return #GNUNET_OK to continue iterating, #GNUNET_SYSERR to abort
 */
typedef int
(*GNUNET_MYSQL_DataProcessor) (void *cls,
                               unsigned int num_values,
                               MYSQL_BIND *values);


/**
 * Create a mysql context.
 *
 * @param cfg configuration
 * @param section configuration section to use to get MySQL configuration options
 * @return the mysql context
 */
struct GNUNET_MYSQL_Context *
GNUNET_MYSQL_context_create (const struct GNUNET_CONFIGURATION_Handle *cfg,
                             const char *section);


/**
 * Destroy a mysql context.  Also frees all associated prepared statements.
 *
 * @param mc context to destroy
 */
void
GNUNET_MYSQL_context_destroy (struct GNUNET_MYSQL_Context *mc);


/**
 * Close database connection and all prepared statements (we got a DB
 * error).  The connection will automatically be re-opened and
 * statements will be re-prepared if they are needed again later.
 *
 * @param mc mysql context
 */
void
GNUNET_MYSQL_statements_invalidate (struct GNUNET_MYSQL_Context *mc);


/**
 * Get internal handle for a prepared statement.  This function should rarely
 * be used, and if, with caution!  On failures during the interaction with
 * the handle, you must call #GNUNET_MYSQL_statements_invalidate()!
 *
 * @param sh prepared statement to introspect
 * @return MySQL statement handle, NULL on error
 */
MYSQL_STMT *
GNUNET_MYSQL_statement_get_stmt (struct GNUNET_MYSQL_StatementHandle *sh);


/**
 * Prepare a statement.  Prepared statements are automatically discarded
 * when the MySQL context is destroyed.
 *
 * @param mc mysql context
 * @param query query text
 * @return prepared statement, NULL on error
 */
struct GNUNET_MYSQL_StatementHandle *
GNUNET_MYSQL_statement_prepare (struct GNUNET_MYSQL_Context *mc,
                                const char *query);


/**
 * Run a SQL statement.
 *
 * @param mc mysql context
 * @param sql SQL statement to run
 * @return #GNUNET_OK on success
 *         #GNUNET_SYSERR if there was a problem
 */
int
GNUNET_MYSQL_statement_run (struct GNUNET_MYSQL_Context *mc,
                            const char *sql);


#if 0                           /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif

#endif

/** @} */  /* end of group */