1 | /* |
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2 | Copyright 2009 Virginia Polytechnic Institute and State University |
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3 | |
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4 | Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | you may not use this file except in compliance with the License. |
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6 | You may obtain a copy of the License at |
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7 | |
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8 | http://www.apache.org/licenses/LICENSE-2.0 |
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9 | |
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10 | Unless required by applicable law or agreed to in writing, software |
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11 | distributed under the License is distributed on an "AS IS" BASIS, |
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12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | See the License for the specific language governing permissions and |
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14 | limitations under the License. |
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15 | */ |
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16 | |
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17 | /* This file contains the declaration *and* default implementation of a VTCROSS |
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18 | * case-based reasoner. |
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19 | * |
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20 | * This class can be used either as-is, or with re-implementations of some/all |
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21 | * of the functions. All functions are declared virtual, and so may be |
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22 | * overridden in the cognitive engine source file as necessary. In addition, |
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23 | * internal class members are declared 'protected', so that they may be |
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24 | * inherited by child implementations. |
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25 | */ |
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26 | |
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27 | |
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28 | #ifndef CBR_H |
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29 | #define CBR_H |
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30 | |
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31 | #include <cstdlib> |
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32 | #include <cstring> |
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33 | #include <cstdio> |
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34 | #include <stdint.h> |
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35 | #include <string> |
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36 | |
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37 | #include <sqlite3.h> |
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38 | |
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39 | #include "vtcross/common.h" |
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40 | #include "vtcross/debug.h" |
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41 | #include "vtcross/error.h" |
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42 | |
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43 | using namespace std; |
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44 | |
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45 | |
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46 | #define DATABASENAME "vtcross_cbr" |
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47 | |
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48 | |
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49 | class CBR |
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50 | { |
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51 | public: |
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52 | /* Constructors for the CBR class. */ |
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53 | CBR(); |
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54 | CBR(char *_filename, char *_tablename, char *_cols[], uint32_t _len); |
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55 | CBR(char *_filename, char *_tablename, char *_cols[], \ |
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56 | char *_primcols[], uint32_t _len, uint32_t _primlen); |
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57 | |
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58 | /* Destructor for the CBR class. Note that this destructor will be |
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59 | * called automatically by any derived classes, and so child classes |
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60 | * should not repeat the freeing actions performed in this function. */ |
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61 | virtual ~CBR(); |
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62 | |
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63 | virtual int32_t OpenDatabase(); |
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64 | |
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65 | virtual int32_t ExecuteCommand(); |
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66 | |
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67 | virtual int32_t ExecuteSearchCommand(float *_retvals); |
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68 | |
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69 | virtual void Print(); |
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70 | |
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71 | virtual int32_t Search(char *_names[], int32_t *_ops, float *_vals, \ |
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72 | uint32_t _n, float *_retvals); |
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73 | virtual int32_t SearchSum(char *_name, float *_retvals); |
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74 | virtual int32_t SearchRand(char *_names[], int * _ops, float *_vals, unsigned int _n, \ |
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75 | float *_retvals); |
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76 | |
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77 | virtual int32_t Update(char *_where[], char *_set[], float *_wherevals, \ |
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78 | float *_setvals, uint32_t _wherelen, uint32_t _setlen); |
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79 | |
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80 | virtual int32_t AddRow(char *_cols[], float *_vals, uint32_t _len); |
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81 | |
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82 | protected: |
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83 | char filename[64]; |
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84 | char tablename[64]; |
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85 | char command[2048]; |
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86 | sqlite3 *db; |
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87 | uint32_t numColumns; |
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88 | }; |
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89 | |
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90 | |
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91 | int32_t |
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92 | callback(void *notUsed, int argc, char **argv, char **azColName) |
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93 | { |
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94 | int i; |
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95 | for(i=0; i<argc; i++){ |
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96 | printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL"); |
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97 | } |
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98 | printf("\n"); |
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99 | return 0; |
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100 | } |
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101 | |
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102 | |
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103 | // open a database or create a database if it does not exist |
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104 | int32_t |
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105 | CBR::OpenDatabase() |
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106 | { |
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107 | int32_t rc; |
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108 | |
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109 | rc = sqlite3_open(filename, &db); |
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110 | if(rc) { |
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111 | WARNING("Can't open database: %s\n", sqlite3_errmsg(db)); |
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112 | sqlite3_close(db); |
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113 | exit(1); |
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114 | } |
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115 | |
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116 | return rc; |
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117 | } |
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118 | |
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119 | |
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120 | // execute command |
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121 | int32_t |
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122 | CBR::ExecuteCommand() |
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123 | { |
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124 | int rc; |
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125 | char *zErrMsg = 0; |
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126 | |
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127 | rc = sqlite3_exec(db, command, callback, 0, &zErrMsg); |
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128 | if( rc!=SQLITE_OK){ |
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129 | fprintf(stderr, "SQL error: %s: %s\n", zErrMsg, command); |
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130 | sqlite3_free(zErrMsg); |
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131 | } |
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132 | |
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133 | return rc; |
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134 | } |
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135 | |
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136 | |
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137 | // execute search command |
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138 | int32_t |
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139 | CBR::ExecuteSearchCommand(float *_retvals) |
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140 | { |
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141 | int rc; |
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142 | unsigned int i; |
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143 | |
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144 | sqlite3_stmt * pStatement; |
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145 | rc = sqlite3_prepare_v2(db, command, -1, &pStatement, NULL); |
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146 | if (rc == SQLITE_OK){ |
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147 | if (sqlite3_step(pStatement) == SQLITE_ROW){ |
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148 | for (i=0; i<numColumns; ++i) |
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149 | _retvals[i] = sqlite3_column_double(pStatement, i); |
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150 | } else { |
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151 | printf("CBR:: No matched results returning default.\n"); |
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152 | rc=31337; |
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153 | } |
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154 | } else { |
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155 | printf("CBR:: Error executing SQL statement. rc = %i\n%s\n",rc,command); |
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156 | } |
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157 | |
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158 | sqlite3_finalize(pStatement); |
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159 | |
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160 | return rc; |
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161 | } |
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162 | |
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163 | |
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164 | // create database |
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165 | CBR::CBR(char * _filename, char * _tablename, char * _cols[], unsigned int _len) |
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166 | { |
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167 | // create database |
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168 | |
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169 | // copy filename |
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170 | unsigned int i=0; |
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171 | strcpy(filename, _filename); |
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172 | |
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173 | // execute create database command |
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174 | // database handle |
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175 | //db = NULL; |
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176 | OpenDatabase(); |
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177 | |
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178 | // create table |
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179 | |
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180 | // copy tablename |
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181 | strcpy(tablename, _tablename); |
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182 | |
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183 | // number of columns in the table |
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184 | numColumns = _len; |
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185 | |
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186 | // generate command |
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187 | strcpy(command, "CREATE TABLE "); |
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188 | strcat(command, tablename); |
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189 | strcat(command, "("); |
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190 | for (i=0; i<numColumns; i++) { |
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191 | strcat(command, _cols[i]); |
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192 | strcat(command, " FLOAT"); |
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193 | if (i != numColumns-1) // not last entry |
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194 | strcat(command, ", "); |
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195 | } |
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196 | strcat(command, ");"); |
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197 | |
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198 | // execute create table command |
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199 | ExecuteCommand(); |
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200 | } |
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201 | |
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202 | // create database |
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203 | CBR::CBR(char * _filename, char * _tablename, |
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204 | char * _cols[], char * _primcols[], unsigned int _len, |
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205 | unsigned int _primlen) |
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206 | { |
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207 | // create database |
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208 | |
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209 | // copy filename |
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210 | unsigned int i=0; |
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211 | strcpy(filename, _filename); |
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212 | |
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213 | // execute create database command |
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214 | // database handle |
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215 | //db = NULL; |
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216 | OpenDatabase(); |
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217 | |
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218 | // create table |
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219 | |
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220 | // copy tablename |
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221 | strcpy(tablename, _tablename); |
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222 | |
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223 | // number of columns in the table |
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224 | numColumns = _len; |
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225 | |
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226 | // generate command |
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227 | strcpy(command, "CREATE TABLE "); |
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228 | strcat(command, tablename); |
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229 | strcat(command, "("); |
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230 | for (i=0; i<numColumns; i++) { |
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231 | strcat(command, _cols[i]); |
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232 | strcat(command, " FLOAT"); |
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233 | strcat(command, ", "); |
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234 | } |
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235 | strcat(command, "PRIMARY KEY ("); |
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236 | for (i=0; i<_primlen; i++) { |
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237 | strcat(command, _primcols[i]); |
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238 | if (i != _primlen-1) // not last entry |
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239 | strcat(command, ", "); |
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240 | } |
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241 | strcat(command, "));"); |
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242 | |
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243 | // execute create table command |
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244 | ExecuteCommand(); |
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245 | } |
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246 | |
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247 | |
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248 | |
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249 | // free space |
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250 | CBR::~CBR() |
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251 | { |
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252 | // generate command, remove a table with its content |
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253 | strcpy(command, "drop table "); |
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254 | strcat(command, tablename); |
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255 | |
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256 | // execute delete command |
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257 | ExecuteCommand(); |
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258 | |
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259 | // clean the database |
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260 | strcpy(command, "vacuum"); |
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261 | ExecuteCommand(); |
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262 | } |
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263 | |
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264 | |
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265 | // print |
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266 | void |
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267 | CBR::Print() |
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268 | { |
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269 | // generate commandi |
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270 | strcpy(command, "select "); |
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271 | strcat(command, tablename); |
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272 | strcat(command, ".* from "); |
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273 | strcat(command, tablename); |
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274 | strcat(command, ";"); |
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275 | |
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276 | // execute print (select all) command |
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277 | ExecuteCommand(); |
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278 | printf("database %s, table %s:\n", filename, tablename); |
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279 | } |
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280 | |
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281 | // |
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282 | // cbr search |
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283 | //int cbr_search(cbr _cbr, char *_names[], int * _ops, float *_vals, unsigned int _n, float *_retvals); |
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284 | int32_t |
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285 | CBR::Search( |
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286 | char *_names[], |
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287 | int * _ops, |
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288 | float *_vals, |
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289 | unsigned int _n, |
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290 | float *_retvals) |
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291 | { |
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292 | int rc; |
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293 | const char *ops_str[] = {"==", "!=", ">", ">=", "<", "<="}; |
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294 | // generate command |
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295 | strcpy(command, "select "); |
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296 | strcat(command, tablename); |
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297 | strcat(command, ".* from "); |
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298 | strcat(command, tablename); |
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299 | strcat(command, " where "); |
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300 | |
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301 | unsigned int i; |
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302 | char str_buffer[64]; |
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303 | printf("number of ops %d:\n", _n); |
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304 | for (i=0; i<_n; i++) { |
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305 | // ensure valid ops value |
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306 | if (_ops[i] < 0 || _ops[i] > 5) { |
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307 | printf("error: cbr_search(), invalid ops id : %d\n", _ops[i]); |
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308 | exit(1); |
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309 | } |
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310 | |
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311 | strcat(command, _names[i]); |
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312 | strcat(command, ops_str[_ops[i]]); |
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313 | printf("search command: %s\n", command); |
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314 | sprintf(str_buffer, "%E", _vals[i]); |
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315 | strcat(command, str_buffer); |
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316 | |
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317 | |
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318 | if (i<_n-1) |
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319 | strcat(command, " AND "); |
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320 | else |
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321 | strcat(command, " order by utility desc;"); |
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322 | } |
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323 | |
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324 | |
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325 | rc = ExecuteSearchCommand(_retvals); |
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326 | |
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327 | return rc; |
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328 | } |
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329 | |
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330 | // cbr search for a sum |
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331 | int32_t |
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332 | CBR::SearchSum( |
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333 | char *_name, |
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334 | float *_retvals) |
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335 | { |
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336 | int rc; |
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337 | // generate command |
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338 | strcpy(command, "select SUM( "); |
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339 | strcat(command, tablename); |
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340 | strcat(command, "."); |
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341 | strcat(command, _name); |
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342 | strcat(command, ") from "); |
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343 | strcat(command, tablename); |
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344 | strcat(command, ";"); |
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345 | |
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346 | //printf("search command: %s\n", command); |
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347 | |
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348 | rc = ExecuteSearchCommand(_retvals); |
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349 | /*printf("search result: "); |
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350 | for (int i=0; i<numColumns; i++) |
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351 | printf("%f, ",_retvals[i]); |
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352 | printf("\n"); |
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353 | */ |
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354 | return rc; |
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355 | } |
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356 | |
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357 | |
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358 | // cbr search |
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359 | int32_t |
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360 | CBR::SearchRand( |
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361 | char *_names[], |
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362 | int * _ops, |
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363 | float *_vals, |
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364 | unsigned int _n, |
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365 | float *_retvals) |
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366 | { |
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367 | const char *ops_str[] = {"==", "!=", ">", ">=", "<", "<="}; |
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368 | int rc; |
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369 | // generate command |
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370 | strcpy(command, "select "); |
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371 | strcat(command, tablename); |
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372 | strcat(command, ".* from "); |
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373 | strcat(command, tablename); |
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374 | strcat(command, " where "); |
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375 | |
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376 | unsigned int i; |
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377 | char str_buffer[64]; |
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378 | for (i=0; i<_n; i++) { |
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379 | // ensure valid ops value |
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380 | if (_ops[i] < 0 || _ops[i] > 5) { |
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381 | printf("error: cbr_search(), invalid ops id : %d\n", _ops[i]); |
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382 | exit(1); |
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383 | } |
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384 | |
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385 | strcat(command, _names[i]); |
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386 | strcat(command, ops_str[_ops[i]]); |
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387 | sprintf(str_buffer, "%E", _vals[i]); |
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388 | strcat(command, str_buffer); |
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389 | |
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390 | if (i<_n-1) |
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391 | strcat(command, " AND "); |
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392 | else |
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393 | strcat(command, " order by RAND();"); |
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394 | } |
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395 | |
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396 | //printf("search command: %s\n", command); |
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397 | |
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398 | rc = ExecuteSearchCommand(_retvals); |
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399 | |
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400 | /*printf("search result: "); |
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401 | for (i=0; i<numColumns; i++) |
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402 | printf("%f, ",_retvals[i]); |
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403 | printf("\n"); |
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404 | */ |
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405 | return rc; |
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406 | } |
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407 | |
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408 | |
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409 | |
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410 | |
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411 | // update a row |
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412 | int32_t |
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413 | CBR::Update(char *_where[], char*_set[], float *_wherevals, float *_setvals, |
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414 | unsigned int _wherelen, unsigned int _setlen) |
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415 | { |
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416 | unsigned int i; |
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417 | |
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418 | // generate command |
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419 | strcpy(command, "UPDATE "); |
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420 | strcat(command, tablename); |
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421 | |
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422 | strcat(command, " SET "); |
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423 | for (i=0; i<_setlen; i++) { |
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424 | strcat(command, _set[i]); |
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425 | strcat(command, " = "); |
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426 | sprintf(command, "%s%f", command, _setvals[i]); |
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427 | strcat(command, " "); |
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428 | if (i != _setlen-1) // not last entry |
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429 | strcat(command, ", "); |
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430 | } |
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431 | strcat(command, " WHERE "); |
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432 | |
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433 | for (i=0; i<_wherelen; i++) { |
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434 | strcat(command, _where[i]); |
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435 | strcat(command, " = "); |
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436 | sprintf(command, "%s%f", command, _wherevals[i]); |
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437 | strcat(command, " "); |
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438 | if (i != _wherelen-1) // not last entry |
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439 | strcat(command, "AND "); |
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440 | } |
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441 | strcat(command, ";"); |
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442 | |
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443 | // execute add command |
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444 | ExecuteCommand(); |
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445 | |
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446 | return 0; |
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447 | } |
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448 | |
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449 | // cbr add a row |
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450 | int32_t |
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451 | CBR::AddRow(char *_cols[], float *_vals, unsigned int _len) |
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452 | { |
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453 | unsigned int i; |
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454 | |
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455 | // generate command |
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456 | strcpy(command, "insert into "); |
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457 | strcat(command, tablename); |
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458 | |
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459 | strcat(command, " ("); |
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460 | for (i=0; i<_len; i++) { |
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461 | strcat(command, _cols[i]); |
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462 | if (i != numColumns-1) // not last entry |
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463 | strcat(command, ", "); |
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464 | } |
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465 | strcat(command, ") "); |
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466 | |
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467 | strcat(command, " values("); |
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468 | for (i=0; i<_len; i++) { |
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469 | // ???? how to fill the values if numColumns != _len |
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470 | // assume = in the following |
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471 | sprintf(command, "%s%f", command, _vals[i]); |
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472 | if (i != numColumns-1) // not last entry |
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473 | strcat(command, ", "); |
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474 | } |
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475 | strcat(command, ");"); |
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476 | |
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477 | // execute add command |
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478 | ExecuteCommand(); |
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479 | |
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480 | return 0; |
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481 | } |
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482 | |
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483 | #endif |
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