[98] | 1 | // |
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| 2 | // Case-based reasoner |
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| 3 | // |
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| 4 | |
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| 5 | #include <stdlib.h> |
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| 6 | #include <string.h> |
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| 7 | #include <stdio.h> |
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| 8 | |
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[161] | 9 | #include "vtcross/cbr.h" |
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| 10 | #include "vtcross/common.h" |
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[98] | 11 | |
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| 12 | |
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| 13 | struct cbr_s { |
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| 14 | char filename[64]; |
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| 15 | char tablename[64]; |
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| 16 | char command[2048]; |
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| 17 | sqlite3 *db; |
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| 18 | unsigned int num_columns; |
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| 19 | }; |
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| 20 | |
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| 21 | |
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| 22 | // open a database or create a database if it does not exist |
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| 23 | int OpenDatabase(cbr _cbr){ |
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| 24 | int rc; |
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| 25 | //sqlite3 **db; |
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| 26 | |
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| 27 | //printf("database name: %s\n", _cbr->filename); |
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| 28 | //rc = sqlite3_open(_cbr->filename, db); |
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| 29 | rc = sqlite3_open(_cbr->filename, &(_cbr->db)); |
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| 30 | if (rc) { |
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| 31 | //fprintf(stderr, "can't open database: %s\n", sqlite3_errmsg(*db)); |
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| 32 | fprintf(stderr, "can't open database: %s\n", sqlite3_errmsg(_cbr->db)); |
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| 33 | sqlite3_close(_cbr->db); |
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| 34 | exit(1); |
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| 35 | } else{ |
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| 36 | //printf("database opened.\n"); |
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| 37 | } |
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| 38 | //_cbr->db = *db; |
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| 39 | return rc; |
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| 40 | } |
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| 41 | |
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| 42 | |
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| 43 | // simple callback function, display result |
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| 44 | int callback(void *notUsed, int argc, char **argv, char **azColName){ |
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| 45 | int i; |
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| 46 | for(i=0; i<argc; i++){ |
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| 47 | printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL"); |
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| 48 | } |
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| 49 | printf("\n"); |
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| 50 | return 0; |
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| 51 | } |
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| 52 | |
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| 53 | |
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| 54 | // execute command |
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| 55 | int ExecuteCommand(cbr _cbr){ |
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| 56 | int rc; |
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| 57 | char *zErrMsg = 0; |
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| 58 | |
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| 59 | //printf("command: %s\n", _cbr->command); |
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| 60 | rc = sqlite3_exec(_cbr->db, _cbr->command, callback, 0, &zErrMsg); |
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| 61 | if( rc!=SQLITE_OK){ |
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[228] | 62 | fprintf(stderr, "SQL error: %s: %s\n", zErrMsg,_cbr->command); |
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[98] | 63 | sqlite3_free(zErrMsg); |
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| 64 | } else{ |
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| 65 | //printf("command executed.\n"); |
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| 66 | } |
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| 67 | return rc; |
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| 68 | } |
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| 69 | |
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| 70 | |
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| 71 | // execute search command |
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| 72 | int ExecuteSearchCommand(cbr _cbr, float *_retvals){ |
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| 73 | int rc; |
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| 74 | unsigned int i; |
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| 75 | |
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| 76 | sqlite3_stmt * pStatement; |
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| 77 | rc = sqlite3_prepare_v2(_cbr->db, _cbr->command, -1, &pStatement, NULL); |
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| 78 | if (rc == SQLITE_OK){ |
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| 79 | if (sqlite3_step(pStatement) == SQLITE_ROW){ |
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[228] | 80 | for (i=0; i<_cbr->num_columns; ++i) |
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| 81 | _retvals[i] = sqlite3_column_double(pStatement, i); |
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[98] | 82 | } else { |
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[228] | 83 | printf("CBR:: No matched results returning default.\n"); |
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| 84 | rc=31337; |
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| 85 | } |
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| 86 | } else { |
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| 87 | printf("CBR:: Error executing SQL statement. rc = %i\n%s\n",rc,_cbr->command); |
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[98] | 88 | } |
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| 89 | |
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| 90 | sqlite3_finalize(pStatement); |
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[228] | 91 | |
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[98] | 92 | return rc; |
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| 93 | } |
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| 94 | |
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| 95 | |
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| 96 | // create database |
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| 97 | cbr cbr_create(char * _filename, char * _tablename, char * _cols[], unsigned int _len) |
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| 98 | { |
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| 99 | // cbr is a pointer to struct cbr_s |
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| 100 | cbr _cbr = (cbr) malloc(sizeof(struct cbr_s)); |
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| 101 | |
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| 102 | // create database |
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| 103 | |
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| 104 | // copy filename |
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| 105 | unsigned int i=0; |
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| 106 | strcpy(_cbr->filename, _filename); |
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| 107 | |
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| 108 | // execute create database command |
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| 109 | // database handle |
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| 110 | //_cbr->db = NULL; |
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| 111 | OpenDatabase(_cbr); |
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| 112 | |
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| 113 | // create table |
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| 114 | |
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| 115 | // copy tablename |
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| 116 | strcpy(_cbr->tablename, _tablename); |
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| 117 | |
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| 118 | // number of columns in the table |
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| 119 | _cbr->num_columns = _len; |
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| 120 | |
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| 121 | // generate command |
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| 122 | strcpy(_cbr->command, "CREATE TABLE "); |
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| 123 | strcat(_cbr->command, _cbr->tablename); |
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| 124 | strcat(_cbr->command, "("); |
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| 125 | for (i=0; i<_cbr->num_columns; i++) { |
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| 126 | strcat(_cbr->command, _cols[i]); |
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| 127 | strcat(_cbr->command, " FLOAT"); |
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| 128 | if (i != _cbr->num_columns-1) // not last entry |
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| 129 | strcat(_cbr->command, ", "); |
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| 130 | } |
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| 131 | strcat(_cbr->command, ");"); |
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| 132 | |
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| 133 | // execute create table command |
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| 134 | ExecuteCommand(_cbr); |
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| 135 | |
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| 136 | return _cbr; |
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| 137 | } |
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| 138 | |
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| 139 | |
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| 140 | // free space |
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| 141 | void cbr_free(cbr _cbr) |
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| 142 | { |
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| 143 | // generate command, remove a table with its content |
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| 144 | strcpy(_cbr->command, "drop table "); |
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| 145 | strcat(_cbr->command, _cbr->tablename); |
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| 146 | |
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| 147 | // execute delete command |
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| 148 | ExecuteCommand(_cbr); |
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| 149 | |
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| 150 | // clean the database |
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| 151 | strcpy(_cbr->command, "vacuum"); |
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| 152 | ExecuteCommand(_cbr); |
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| 153 | |
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| 154 | free(_cbr); |
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| 155 | } |
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| 156 | |
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| 157 | |
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| 158 | // print |
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| 159 | void cbr_print(cbr _cbr) |
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| 160 | { |
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| 161 | // generate commandi |
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| 162 | strcpy(_cbr->command, "select "); |
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| 163 | strcat(_cbr->command, _cbr->tablename); |
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| 164 | strcat(_cbr->command, ".* from "); |
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| 165 | strcat(_cbr->command, _cbr->tablename); |
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| 166 | strcat(_cbr->command, ";"); |
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| 167 | |
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| 168 | // execute print (select all) command |
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| 169 | ExecuteCommand(_cbr); |
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[228] | 170 | printf("database %s, table %s:\n", _cbr->filename, _cbr->tablename); |
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[98] | 171 | } |
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| 172 | |
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| 173 | |
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| 174 | /*//static |
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| 175 | int cbr_callback(void *notUsed, int argc, char **argv, char **azColName) |
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| 176 | { |
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| 177 | return 0; |
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| 178 | }*/ |
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| 179 | |
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| 180 | |
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| 181 | const char * ops_str[] = { |
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| 182 | "==", "!=", ">", ">=", "<", "<="}; |
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| 183 | |
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| 184 | |
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| 185 | // cbr search |
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| 186 | int cbr_search( |
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| 187 | cbr _cbr, |
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| 188 | char *_names[], |
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| 189 | int * _ops, |
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| 190 | float *_vals, |
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| 191 | unsigned int _n, |
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| 192 | float *_retvals) |
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| 193 | { |
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[228] | 194 | int rc; |
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[98] | 195 | // generate command |
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| 196 | strcpy(_cbr->command, "select "); |
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| 197 | strcat(_cbr->command, _cbr->tablename); |
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| 198 | strcat(_cbr->command, ".* from "); |
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| 199 | strcat(_cbr->command, _cbr->tablename); |
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| 200 | strcat(_cbr->command, " where "); |
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| 201 | |
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| 202 | unsigned int i; |
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| 203 | char str_buffer[64]; |
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| 204 | //printf("number of ops %d:\n", _n); |
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| 205 | for (i=0; i<_n; i++) { |
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| 206 | // ensure valid ops value |
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| 207 | if (_ops[i] < 0 || _ops[i] > 5) { |
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| 208 | printf("error: cbr_search(), invalid ops id : %d\n", _ops[i]); |
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| 209 | exit(1); |
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| 210 | } |
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| 211 | |
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| 212 | strcat(_cbr->command, _names[i]); |
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| 213 | strcat(_cbr->command, ops_str[_ops[i]]); |
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| 214 | sprintf(str_buffer, "%E", _vals[i]); |
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| 215 | strcat(_cbr->command, str_buffer); |
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| 216 | |
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[228] | 217 | |
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[98] | 218 | if (i<_n-1) |
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| 219 | strcat(_cbr->command, " AND "); |
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| 220 | else |
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| 221 | strcat(_cbr->command, " order by utility desc;"); |
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| 222 | } |
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| 223 | |
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[230] | 224 | //printf("search command: %s\n", _cbr->command); |
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[98] | 225 | |
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| 226 | //ExecuteCommand(_cbr); |
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[228] | 227 | rc = ExecuteSearchCommand(_cbr, _retvals); |
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[98] | 228 | |
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| 229 | /*printf("search result: "); |
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| 230 | for (i=0; i<_cbr->num_columns; i++) |
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| 231 | printf("%f, ",_retvals[i]); |
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| 232 | printf("\n");*/ |
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| 233 | |
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[228] | 234 | return rc; |
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[98] | 235 | } |
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| 236 | |
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| 237 | |
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[230] | 238 | // update a row |
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| 239 | int cbr_update(cbr _cbr, char *_where[], char*_set[], float *_wherevals, float *_setvals, |
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| 240 | unsigned int _wherelen, unsigned int _setlen) |
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| 241 | { |
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| 242 | unsigned int i; |
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| 243 | |
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| 244 | // generate command |
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| 245 | //printf("%s\n", _cbr->command); |
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| 246 | strcpy(_cbr->command, "UPDATE "); |
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| 247 | strcat(_cbr->command, _cbr->tablename); |
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| 248 | |
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| 249 | strcat(_cbr->command, " SET "); |
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| 250 | for (i=0; i<_setlen; i++) { |
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| 251 | strcat(_cbr->command, _set[i]); |
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| 252 | strcat(_cbr->command, " = "); |
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| 253 | sprintf(_cbr->command, "%s%f", _cbr->command, _setvals[i]); |
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| 254 | strcat(_cbr->command, " "); |
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| 255 | if (i != _setlen-1) // not last entry |
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| 256 | strcat(_cbr->command, ", "); |
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| 257 | } |
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| 258 | strcat(_cbr->command, " WHERE "); |
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| 259 | |
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| 260 | for (i=0; i<_wherelen; i++) { |
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| 261 | strcat(_cbr->command, _where[i]); |
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| 262 | strcat(_cbr->command, " = "); |
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| 263 | sprintf(_cbr->command, "%s%f", _cbr->command, _wherevals[i]); |
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| 264 | strcat(_cbr->command, " "); |
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| 265 | if (i != _wherelen-1) // not last entry |
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| 266 | strcat(_cbr->command, "AND "); |
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| 267 | } |
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| 268 | strcat(_cbr->command, ";"); |
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| 269 | |
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| 270 | //printf("search command: %s\n", _cbr->command); |
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| 271 | // execute add command |
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| 272 | ExecuteCommand(_cbr); |
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| 273 | |
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| 274 | return 0; |
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| 275 | } |
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| 276 | |
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[98] | 277 | // cbr add a row |
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| 278 | int cbr_add_row(cbr _cbr, char *_cols[], float *_vals, unsigned int _len) |
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| 279 | { |
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| 280 | unsigned int i; |
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| 281 | |
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| 282 | // generate command |
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| 283 | //printf("%s\n", _cbr->command); |
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| 284 | strcpy(_cbr->command, "insert into "); |
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| 285 | strcat(_cbr->command, _cbr->tablename); |
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| 286 | |
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| 287 | strcat(_cbr->command, " ("); |
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| 288 | for (i=0; i<_len; i++) { |
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| 289 | strcat(_cbr->command, _cols[i]); |
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| 290 | if (i != _cbr->num_columns-1) // not last entry |
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| 291 | strcat(_cbr->command, ", "); |
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| 292 | } |
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| 293 | strcat(_cbr->command, ") "); |
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| 294 | |
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| 295 | strcat(_cbr->command, " values("); |
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| 296 | for (i=0; i<_len; i++) { |
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| 297 | // ???? how to fill the values if _cbr->num_columns != _len |
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| 298 | // assume = in the following |
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| 299 | sprintf(_cbr->command, "%s%f", _cbr->command, _vals[i]); |
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| 300 | if (i != _cbr->num_columns-1) // not last entry |
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| 301 | strcat(_cbr->command, ", "); |
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| 302 | } |
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| 303 | strcat(_cbr->command, ");"); |
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| 304 | |
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[230] | 305 | //printf("search command: %s\n", _cbr->command); |
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[98] | 306 | // execute add command |
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| 307 | ExecuteCommand(_cbr); |
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| 308 | |
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| 309 | return 0; |
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| 310 | } |
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| 311 | |
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