1 | // |
---|
2 | // Case-based reasoner |
---|
3 | // |
---|
4 | |
---|
5 | #include <stdlib.h> |
---|
6 | #include <string.h> |
---|
7 | #include <stdio.h> |
---|
8 | |
---|
9 | #include "cbr.h" |
---|
10 | |
---|
11 | struct cbr_s { |
---|
12 | char filename[64]; |
---|
13 | char tablename[64]; |
---|
14 | char command[2048]; |
---|
15 | sqlite3 *db; |
---|
16 | unsigned int num_columns; |
---|
17 | }; |
---|
18 | |
---|
19 | |
---|
20 | // open database or create database is it does not exist |
---|
21 | int OpenDatabase(cbr _cbr){ |
---|
22 | int rc; |
---|
23 | //sqlite3 **db; |
---|
24 | |
---|
25 | printf("database name: %s\n", _cbr->filename); |
---|
26 | //rc = sqlite3_open(_cbr->filename, db); |
---|
27 | rc = sqlite3_open(_cbr->filename, &(_cbr->db)); |
---|
28 | if (rc) { |
---|
29 | //fprintf(stderr, "can't open database: %s\n", sqlite3_errmsg(*db)); |
---|
30 | fprintf(stderr, "can't open database: %s\n", sqlite3_errmsg(_cbr->db)); |
---|
31 | sqlite3_close(_cbr->db); |
---|
32 | exit(1); |
---|
33 | } else{ |
---|
34 | printf("database opened.\n"); |
---|
35 | } |
---|
36 | //_cbr->db = *db; |
---|
37 | return rc; |
---|
38 | } |
---|
39 | |
---|
40 | |
---|
41 | //int cbr_callback(void *notUsed, int argc, char **argv, char **azColName) |
---|
42 | int callback(void *notUsed, int argc, char **argv, char **azColName){ |
---|
43 | int i; |
---|
44 | for(i=0; i<argc; i++){ |
---|
45 | printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL"); |
---|
46 | } |
---|
47 | printf("\n"); |
---|
48 | return 0; |
---|
49 | } |
---|
50 | |
---|
51 | |
---|
52 | int ExecuteCommand(cbr _cbr){ |
---|
53 | int rc; |
---|
54 | char *zErrMsg = 0; |
---|
55 | |
---|
56 | printf("command: %s\n", _cbr->command); |
---|
57 | rc = sqlite3_exec(_cbr->db, _cbr->command, callback, 0, &zErrMsg); |
---|
58 | if( rc!=SQLITE_OK){ |
---|
59 | fprintf(stderr, "SQL error: %s\n", zErrMsg); |
---|
60 | sqlite3_free(zErrMsg); |
---|
61 | } else{ |
---|
62 | printf("command executed.\n"); |
---|
63 | } |
---|
64 | return rc; |
---|
65 | } |
---|
66 | |
---|
67 | |
---|
68 | cbr cbr_create(char * _filename, char * _tablename, char * _cols[], unsigned int _len) |
---|
69 | { |
---|
70 | // cbr is a pointer to struct cbr_s |
---|
71 | cbr _cbr = (cbr) malloc(sizeof(struct cbr_s)); |
---|
72 | |
---|
73 | // create database |
---|
74 | |
---|
75 | // copy filename |
---|
76 | unsigned int i=0; |
---|
77 | strcpy(_cbr->filename, _filename); |
---|
78 | |
---|
79 | // execute create database command |
---|
80 | // database handle |
---|
81 | //_cbr->db = NULL; |
---|
82 | OpenDatabase(_cbr); |
---|
83 | |
---|
84 | // create table |
---|
85 | |
---|
86 | // copy tablename |
---|
87 | strcpy(_cbr->tablename, _tablename); |
---|
88 | |
---|
89 | // number of columns in the table |
---|
90 | _cbr->num_columns = _len; |
---|
91 | |
---|
92 | // generate command |
---|
93 | strcpy(_cbr->command, "CREATE TABLE "); |
---|
94 | strcat(_cbr->command, _cbr->tablename); |
---|
95 | strcat(_cbr->command, "("); |
---|
96 | for (i=0; i<_cbr->num_columns; i++) { |
---|
97 | strcat(_cbr->command, _cols[i]); |
---|
98 | strcat(_cbr->command, " FLOAT"); |
---|
99 | if (i != _cbr->num_columns-1) // not last entry |
---|
100 | strcat(_cbr->command, ", "); |
---|
101 | } |
---|
102 | strcat(_cbr->command, ");"); |
---|
103 | |
---|
104 | // execute create table command |
---|
105 | ExecuteCommand(_cbr); |
---|
106 | |
---|
107 | return _cbr; |
---|
108 | } |
---|
109 | |
---|
110 | void cbr_free(cbr _cbr) |
---|
111 | { |
---|
112 | // delete table here |
---|
113 | // delete table |
---|
114 | |
---|
115 | /*// generate command, delete all entries of a table |
---|
116 | strcpy(_cbr->command, "delete from "); |
---|
117 | strcat(_cbr->command, _cbr->tablename);*/ |
---|
118 | |
---|
119 | // generate command, remove a table with its content |
---|
120 | strcpy(_cbr->command, "drop table "); |
---|
121 | strcat(_cbr->command, _cbr->tablename); |
---|
122 | |
---|
123 | // execute delete command |
---|
124 | ExecuteCommand(_cbr); |
---|
125 | |
---|
126 | free(_cbr); |
---|
127 | } |
---|
128 | |
---|
129 | void cbr_print(cbr _cbr) |
---|
130 | { |
---|
131 | // generate command |
---|
132 | strcpy(_cbr->command, "select * from "); |
---|
133 | strcat(_cbr->command, _cbr->tablename); |
---|
134 | strcat(_cbr->command, ";"); |
---|
135 | |
---|
136 | // execute print (select all) command |
---|
137 | ExecuteCommand(_cbr); |
---|
138 | //printf("database %s, table %s:\n", _cbr->filename, _cbr->tablename); |
---|
139 | } |
---|
140 | |
---|
141 | //static |
---|
142 | int cbr_callback(void *notUsed, int argc, char **argv, char **azColName) |
---|
143 | { |
---|
144 | return 0; |
---|
145 | } |
---|
146 | |
---|
147 | int cbr_search(cbr _cbr, char *_names[], int * _ops, float *_vals, unsigned int _n, float *_retvals) |
---|
148 | { |
---|
149 | // set up statement |
---|
150 | |
---|
151 | char* zErrMsg = NULL; |
---|
152 | //sqlite3_exec(_cbr->db, argv[2], callback, NULL, &zErrMsg); |
---|
153 | sqlite3_exec(_cbr->db, _cbr->command, cbr_callback, NULL, &zErrMsg); |
---|
154 | |
---|
155 | return 0; |
---|
156 | } |
---|
157 | |
---|
158 | int cbr_add_row(cbr _cbr, char *_cols[], float *_vals, unsigned int _len) |
---|
159 | { |
---|
160 | unsigned int i; |
---|
161 | |
---|
162 | // generate command |
---|
163 | printf("%s\n", _cbr->command); |
---|
164 | strcpy(_cbr->command, "insert into "); |
---|
165 | strcat(_cbr->command, _cbr->tablename); |
---|
166 | |
---|
167 | strcat(_cbr->command, " ("); |
---|
168 | for (i=0; i<_len; i++) { |
---|
169 | strcat(_cbr->command, _cols[i]); |
---|
170 | if (i != _cbr->num_columns-1) // not last entry |
---|
171 | strcat(_cbr->command, ", "); |
---|
172 | } |
---|
173 | strcat(_cbr->command, ") "); |
---|
174 | |
---|
175 | strcat(_cbr->command, " values("); |
---|
176 | for (i=0; i<_len; i++) { |
---|
177 | // ???? how to fill the values if _cbr->num_columns != _len |
---|
178 | // assume = in the following |
---|
179 | sprintf(_cbr->command, "%s%f", _cbr->command, _vals[i]); |
---|
180 | if (i != _cbr->num_columns-1) // not last entry |
---|
181 | strcat(_cbr->command, ", "); |
---|
182 | } |
---|
183 | strcat(_cbr->command, ");"); |
---|
184 | |
---|
185 | // execute add command |
---|
186 | ExecuteCommand(_cbr); |
---|
187 | |
---|
188 | return 0; |
---|
189 | } |
---|
190 | |
---|