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 default implementation of the CBR class, defined in |
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18 | * the cbr.h include file. This implementation is compiled into a static |
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19 | * library which can be used as as backend for any cognitive engine. */ |
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20 | |
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21 | |
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22 | #include "vtcross/cbr.h" |
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23 | #include <iostream> |
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24 | |
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25 | using namespace std; |
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26 | |
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27 | |
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28 | /* This is an internal debugging function used by some sqlite3 function calls. |
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29 | * It is not used otherwise in the CROSS codebase. */ |
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30 | int32_t |
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31 | callback(void *notUsed, int32_t argc, char **argv, char **azColName) |
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32 | { |
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33 | for(size_t i = 0; i < argc; i++) { |
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34 | LOG("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL"); |
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35 | } |
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36 | LOG("\n"); |
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37 | |
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38 | return 0; |
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39 | } |
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40 | |
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41 | |
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42 | CBR::CBR(string _filename, string _tablename, string _cols[], uint32_t _len) |
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43 | { |
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44 | /* Store database properties. */ |
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45 | filename = _filename; |
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46 | tablename = _tablename; |
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47 | numColumns = _len; |
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48 | |
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49 | /* Create the database (or open it if it already exists). */ |
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50 | OpenDatabase(); |
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51 | |
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52 | /* Generate the command that will create the initial table within the |
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53 | * CROSS database. */ |
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54 | command = "CREATE TABLE " + tablename + "("; |
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55 | for(size_t i = 0; i < numColumns; i++) { |
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56 | command += _cols[i] + " FLOAT"; |
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57 | |
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58 | /* If this column is not the last entry, add a comma to the command in |
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59 | * preperation for the next entry. */ |
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60 | if(i != numColumns - 1) |
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61 | command += ", "; |
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62 | } |
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63 | command += ");"; |
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64 | |
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65 | /* Execute the generated command. At this point, the database is ready for |
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66 | * use. */ |
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67 | ExecuteCommand(); |
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68 | |
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69 | std::cout << "Table Created" << std::endl; |
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70 | } |
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71 | |
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72 | |
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73 | CBR::CBR(string _filename, string _tablename, string _cols[], \ |
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74 | string _primcols[], uint32_t _len, uint32_t _primlen) |
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75 | { |
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76 | /* Store database properties. */ |
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77 | filename = _filename; |
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78 | tablename = _tablename; |
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79 | numColumns = _len; |
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80 | |
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81 | /* Create the database (or open it if it already exists). */ |
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82 | OpenDatabase(); |
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83 | |
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84 | /* Generate the command that will create the initial table within the |
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85 | * CROSS database with primary keys. */ |
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86 | command = "CREATE TABLE " + tablename + "("; |
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87 | for(size_t i = 0; i < numColumns; i++) { |
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88 | command += _cols[i] + " FLOAT, "; |
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89 | } |
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90 | |
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91 | command += "PRIMARY KEY ("; |
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92 | for(size_t j = 0; j < _primlen; j++) { |
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93 | command += _primcols[j]; |
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94 | |
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95 | /* If this column is not the last entry, add a comma to the command in |
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96 | * preperation for the next entry. */ |
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97 | if(j != _primlen - 1) |
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98 | command += ", "; |
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99 | } |
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100 | command += "));"; |
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101 | |
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102 | /* Execute the generated command. At this point, the database is ready for |
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103 | * use. */ |
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104 | ExecuteCommand(); |
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105 | } |
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106 | |
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107 | |
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108 | CBR::~CBR() |
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109 | { |
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110 | /* Generate the sqlite command to delete a table and all of its contents, |
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111 | * and then execute it. */ |
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112 | command = "drop table " + tablename; |
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113 | ExecuteCommand(); |
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114 | |
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115 | /* Tell sqlite to clean up the database. */ |
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116 | command = "vacuum"; |
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117 | ExecuteCommand(); |
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118 | } |
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119 | |
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120 | |
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121 | int32_t |
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122 | CBR::OpenDatabase() |
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123 | { |
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124 | int32_t rc = sqlite3_open(filename.c_str(), &db); |
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125 | if(rc) { |
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126 | WARNING("Can't open database: %s\n", sqlite3_errmsg(db)); |
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127 | sqlite3_close(db); |
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128 | exit(1); |
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129 | } |
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130 | |
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131 | return rc; |
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132 | } |
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133 | |
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134 | |
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135 | int32_t |
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136 | CBR::ExecuteCommand() |
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137 | { |
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138 | char *zErrMsg = 0; |
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139 | |
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140 | int32_t rc = sqlite3_exec(db, command.c_str(), callback, 0, &zErrMsg); |
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141 | if(rc != SQLITE_OK) { |
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142 | WARNING("SQL error: %s: %s\n", zErrMsg, command.c_str()); |
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143 | sqlite3_free(zErrMsg); |
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144 | } |
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145 | |
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146 | return rc; |
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147 | } |
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148 | |
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149 | |
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150 | int32_t |
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151 | CBR::ExecuteSearchCommand(float *_retvals) |
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152 | { |
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153 | sqlite3_stmt *pStatement; |
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154 | |
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155 | int32_t rc = sqlite3_prepare_v2(db, command.c_str(), -1, &pStatement, NULL); |
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156 | if(rc == SQLITE_OK) { |
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157 | if(sqlite3_step(pStatement) == SQLITE_ROW) { |
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158 | for(size_t i = 0; i < numColumns; ++i) { |
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159 | _retvals[i] = sqlite3_column_double(pStatement, i); |
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160 | } |
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161 | } else { |
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162 | LOG("CBR:: No matched results returning default.\n"); |
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163 | rc = 31337; |
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164 | } |
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165 | } else { |
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166 | WARNING("CBR:: Error executing SQL statement. rc = %i\n%s\n", rc, command.c_str()); |
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167 | } |
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168 | |
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169 | sqlite3_finalize(pStatement); |
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170 | |
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171 | return rc; |
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172 | } |
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173 | |
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174 | |
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175 | void |
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176 | CBR::Print() |
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177 | { |
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178 | /* Generate the sqlite command to print the database, which is effectively a |
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179 | * 'select all elements' command, and then execute it. */ |
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180 | command = "select " + tablename + ".* from " + tablename + ";"; |
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181 | |
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182 | ExecuteCommand(); |
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183 | LOG("database %s, table %s:\n", filename.c_str(), tablename.c_str()); |
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184 | } |
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185 | |
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186 | |
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187 | int32_t |
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188 | CBR::Search(string _names[], int32_t *_ops, float *_vals, uint32_t _n, \ |
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189 | float *_retvals) |
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190 | { |
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191 | char str_buffer[64]; |
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192 | const string ops_str[] = {"==", "!=", ">", ">=", "<", "<="}; |
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193 | |
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194 | command = "select " + tablename + ".* from " + tablename + " where "; |
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195 | |
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196 | for(size_t i = 0; i < _n; i++) { |
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197 | /* Make sure that the passed ops value is valid. */ |
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198 | if((_ops[i] < 0) || (_ops[i] > 5)) { |
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199 | ERROR(1, "Error: cbr_search(), invalid ops id : %d\n", _ops[i]); |
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200 | } |
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201 | |
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202 | command += _names[i] + ops_str[_ops[i]]; |
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203 | |
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204 | |
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205 | sprintf(str_buffer, "%E", _vals[i]); |
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206 | command += string(str_buffer); |
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207 | |
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208 | if(i < _n - 1) |
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209 | command += " AND "; |
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210 | else |
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211 | command += ";"; |
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212 | |
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213 | } |
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214 | //LOG("CBR::Search - command: %s\n", command.c_str()); |
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215 | |
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216 | return ExecuteSearchCommand(_retvals); |
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217 | } |
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218 | |
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219 | |
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220 | int32_t |
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221 | CBR::SearchSum(string _name, float *_retvals) |
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222 | { |
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223 | command = "select SUM(" + tablename + "." + _name + ") from " + tablename + ";"; |
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224 | |
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225 | return ExecuteSearchCommand(_retvals); |
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226 | } |
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227 | |
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228 | |
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229 | int32_t |
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230 | CBR::SearchRand(string _names[], int32_t *_ops, float *_vals, uint32_t _n, \ |
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231 | float *_retvals) |
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232 | { |
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233 | char str_buffer[64]; |
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234 | const char *ops_str[] = {"==", "!=", ">", ">=", "<", "<="}; |
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235 | |
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236 | command = "select " + tablename + ".* from " + tablename + " where "; |
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237 | |
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238 | for(size_t i = 0; i < _n; i++) { |
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239 | /* Make sure that the passed ops value is valid. */ |
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240 | if((_ops[i] < 0) || (_ops[i] > 5)) { |
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241 | ERROR(1, "Error: cbr_search(), invalid ops id : %d\n", _ops[i]); |
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242 | } |
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243 | |
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244 | command += _names[i] + ops_str[_ops[i]]; |
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245 | |
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246 | sprintf(str_buffer, "%E", _vals[i]); |
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247 | command += str_buffer; |
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248 | |
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249 | if(i < _n - 1) |
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250 | command += " AND "; |
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251 | else |
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252 | command += " order by RAND();"; |
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253 | } |
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254 | |
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255 | return ExecuteSearchCommand(_retvals); |
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256 | } |
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257 | |
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258 | |
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259 | int32_t |
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260 | CBR::Update(string _where[], string _set[], float *_wherevals, float *_setvals, |
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261 | uint32_t _wherelen, uint32_t _setlen) |
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262 | { |
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263 | char str_buffer[64]; |
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264 | |
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265 | /* Generate the command to update the table. */ |
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266 | command = "UPDATE " + tablename + " SET "; |
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267 | |
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268 | for(size_t i = 0; i < _setlen; i++) { |
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269 | command += _set[i] + " = "; |
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270 | sprintf(str_buffer, "%f", _setvals[i]); |
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271 | command += string(str_buffer) + " "; |
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272 | |
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273 | if(i != _setlen - 1) |
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274 | command += ", "; |
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275 | } |
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276 | command += " WHERE "; |
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277 | |
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278 | for(size_t j = 0; j < _wherelen; j++) { |
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279 | command += _where[j] + " = "; |
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280 | sprintf(str_buffer, "%f", _wherevals[j]); |
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281 | command += string(str_buffer) + " "; |
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282 | |
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283 | if(j != _wherelen - 1) |
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284 | command += "AND "; |
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285 | } |
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286 | command += ";"; |
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287 | |
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288 | return ExecuteCommand(); |
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289 | } |
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290 | |
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291 | |
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292 | int32_t |
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293 | CBR::AddRow(string _cols[], float *_vals, uint32_t _len) |
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294 | { |
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295 | char str_buffer[64]; |
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296 | |
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297 | command = "insert into " + tablename + " ("; |
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298 | |
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299 | for(size_t i = 0; i < _len; i++) { |
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300 | command += _cols[i]; |
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301 | |
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302 | if(i != numColumns - 1) |
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303 | command += ", "; |
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304 | } |
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305 | command += ") values("; |
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306 | |
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307 | for(size_t j = 0; j < _len; j++) { |
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308 | // TODO I have no idea what the below question is about. |
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309 | // ???? how to fill the values if numColumns != _len |
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310 | // assume = in the following |
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311 | sprintf(str_buffer, "%f", _vals[j]); |
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312 | command += str_buffer; |
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313 | |
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314 | if(j != numColumns - 1) |
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315 | command += ", "; |
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316 | } |
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317 | command += ");"; |
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318 | |
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319 | return ExecuteCommand(); |
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320 | } |
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321 | |
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