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
|
#include <asm-generic/errno-base.h>
#include <stdio.h>
#include <stdlib.h>
#include <sqlite3.h>
#include <sys/stat.h>
#include <unistd.h>
#include "config.h"
#include "db.h"
/* return values:
0 -> success
1 -> failure
*/
int create_tables(const char *path);
// callback function prototypes
int count_callback(void *first_arg, int argc, char **argv, char **azColName);
int load_groups_callback(void *first_arg, int argc, char **argv, char **azColName);
// globals
static int callback_index; // keep track of index when filling arrays using callback functions
int db_init() {
int res;
char db_path[BUF_LEN];
// create USER_DATA_DIR if not exists
res = mkdir(USER_DATA_DIR, S_IRWXU);
//if(res != 0 && res != EEXIST) return 1; // TODO write a better check incase mkdir fails
// return if db already exists
res = access(USER_DATA_PATH, F_OK);
if(res == 0) return 0;
// create database with tables
res = create_tables(USER_DATA_PATH);
if(res != 0) return 2;
return 0;
}
Group *db_load_groups() {
Group *output;
sqlite3 *db;
const char *count_query = "SELECT COUNT(*) FROM 'Group'";
const char *query = "SELECT ROWID, * FROM 'Group'";
char *zErrMsg = NULL; // hold error from sqlite3_exec
int res;
res = sqlite3_open(USER_DATA_PATH, &db);
if(res) {
fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);
return NULL;
}
// count rows in table
res = sqlite3_exec(db, count_query, count_callback, &output, &zErrMsg);
if(res != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
return NULL;
}
// do select query
callback_index = 0;
res = sqlite3_exec(db, query, load_groups_callback, &output, &zErrMsg);
if(res != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
return NULL;
}
sqlite3_close(db);
return output;
}
Entry *db_load_entries() {
// TODO
return NULL;
}
int create_tables(const char *path) {
sqlite3 *db;
char queries[2][BUF_LEN];
int num_queries = 2;
char *zErrMsg = NULL; // hold error from sqlite3_exec
int res;
int i;
// Group table - stores groups of entries
// note: in sqlite, use rowid, don't create id column
sprintf(queries[0],
"CREATE TABLE IF NOT EXISTS 'Group' ("
"'Name' varchar(%d) NOT NULL, "
"'Desc' varchar(%d) DEFAULT NULL, "
"'Url' varchar(%d) DEFAULT NULL);",
BUF_LEN, BUF_LEN, BUF_LEN);
// Entry table - stores individual entries
sprintf(queries[1],
"CREATE TABLE IF NOT EXISTS 'Entry' ("
"'Group_ID' int NOT NULL, " // FIXME might want foreign key constraint
"'Due_date' date DEFAULT NULL, "
"'Alt_due_date' varchar(%d) DEFAULT NULL, "
"'Title' varchar(%d) NOT NULL, "
"'Color' varchar(%d) DEFAULT NULL, "
"'Highlight' varchar(%d) DEFAULT NULL, "
"'Done' boolean DEFAULT NULL, "
"'Url' varchar(%d) DEFAULT NULL);",
BUF_LEN, BUF_LEN, BUF_LEN, BUF_LEN, BUF_LEN);
// open the database and run each query
res = sqlite3_open(path, &db);
if(res) {
fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);
return 1;
}
for(i = 0; i < num_queries; ++i) {
res = sqlite3_exec(db, queries[i], NULL, NULL, &zErrMsg);
if(res != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
}
}
// wrap-up
sqlite3_close(db);
return 0;
}
// callback functions
int count_callback(void *first_arg, int argc, char **argv, char **azColName) {
printf("count: %d\n", argc);
Group **groups = (Group **) first_arg;
*groups = malloc(sizeof(Group) * argc);
return 0;
}
int load_groups_callback(void *first_arg, int argc, char **argv, char **azColName) {
Group **groups = (Group **) first_arg;
// check that enough arguments were passed
if(argc < 4) {
fprintf(stderr, "Error: not enough rows returned in 'Group' table\n");
return 1;
}
group_set_id(&((*groups)[callback_index]), (argv[0] ? atoi(argv[0]) : 0));
group_set_name(&((*groups)[callback_index]), (argv[1] ? argv[1] : ""));
group_set_desc(&((*groups)[callback_index]), (argv[2] ? argv[2] : ""));
group_set_url(&((*groups)[callback_index]), (argv[3] ? argv[3] : ""));
printf("%d\n", argc);
++callback_index;
return 0;
}
|
