1 /**
2  * collectd - src/utils_db_query.h
3  * Copyright (C) 2008,2009  Florian octo Forster
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a
6  * copy of this software and associated documentation files (the "Software"),
7  * to deal in the Software without restriction, including without limitation
8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9  * and/or sell copies of the Software, and to permit persons to whom the
10  * Software is furnished to do so, subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice shall be included in
13  * all copies or substantial portions of the Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21  * DEALINGS IN THE SOFTWARE.
22  *
23  * Authors:
24  *   Florian octo Forster <octo at collectd.org>
25  **/
26 
27 #ifndef UTILS_DB_QUERY_H
28 #define UTILS_DB_QUERY_H 1
29 
30 /*
31  * Data types
32  */
33 struct udb_query_s;
34 typedef struct udb_query_s udb_query_t;
35 
36 struct udb_query_preparation_area_s;
37 typedef struct udb_query_preparation_area_s udb_query_preparation_area_t;
38 
39 typedef int (*udb_query_create_callback_t)(udb_query_t *q, oconfig_item_t *ci);
40 
41 /*
42  * Public functions
43  */
44 int udb_query_create(udb_query_t ***ret_query_list, size_t *ret_query_list_len,
45                      oconfig_item_t *ci, udb_query_create_callback_t cb);
46 void udb_query_free(udb_query_t **query_list, size_t query_list_len);
47 
48 int udb_query_pick_from_list_by_name(const char *name, udb_query_t **src_list,
49                                      size_t src_list_len,
50                                      udb_query_t ***dst_list,
51                                      size_t *dst_list_len);
52 int udb_query_pick_from_list(oconfig_item_t *ci, udb_query_t **src_list,
53                              size_t src_list_len, udb_query_t ***dst_list,
54                              size_t *dst_list_len);
55 
56 const char *udb_query_get_name(udb_query_t *q);
57 const char *udb_query_get_statement(udb_query_t *q);
58 
59 void udb_query_set_user_data(udb_query_t *q, void *user_data);
60 void *udb_query_get_user_data(udb_query_t *q);
61 
62 /*
63  * udb_query_check_version
64  *
65  * Returns 0 if the query is NOT suitable for `version' and >0 if the
66  * query IS suitable.
67  */
68 int udb_query_check_version(udb_query_t *q, unsigned int version);
69 
70 int udb_query_prepare_result(udb_query_t const *q,
71                              udb_query_preparation_area_t *prep_area,
72                              const char *host, const char *plugin,
73                              const char *db_name, char **column_names,
74                              size_t column_num);
75 int udb_query_handle_result(udb_query_t const *q,
76                             udb_query_preparation_area_t *prep_area,
77                             char **column_values);
78 void udb_query_finish_result(udb_query_t const *q,
79                              udb_query_preparation_area_t *prep_area);
80 
81 udb_query_preparation_area_t *
82 udb_query_allocate_preparation_area(udb_query_t *q);
83 void udb_query_delete_preparation_area(udb_query_preparation_area_t *q_area);
84 
85 #endif /* UTILS_DB_QUERY_H */
86