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GeezerVison is showing github.com — livecode/revdb/src/postgresql_cursor.cpp at develop · livecode/livecode
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Expand file tree/ Copy pathpostgresql_cursor.cppMore file actions 366 lines (328 loc) · 8.97 KB / Copy pathpostgresql_cursor.cppFile metadata and controls366 lines (328 loc) · 8.97 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 /* Copyright (C) 2003-2015 LiveCode Ltd. This file is part of LiveCode. LiveCode is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License v3 as published by the Free Software Foundation. LiveCode is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with LiveCode. If not see <http://www.gnu.org/licenses/>. */ /*DBCURSOR_POSTGRESQL - CUSROR OBJECT FOR POSTGRESQL DATABASES CHILD OF DBCURSOR Attributes: POSTGRESQL_res - result set structure for POSTGRESQL database isBOF - True if at beginning of resultset (inherited) isEOF - True if at end of resultset (inherited) recordNum - Number of current record -1 (inherited) recordCount - Number of records in resultset (inherited) fieldCount - Number of columns (inherited) fields - Array of fields (inherited) connection - Pointer to dbconnection_POSTGRESQL object that created cursor Methods: Open - opens cursor and retrieves resultset from connection Close - closes cursor and frees any resources used by cursor getFieldsInformation - get column names, types, and info getRowData - Retrieve the data from the current row. first - move to first row of resultset next - move to next row of resultset prev - move to previous row of resultset last - move to last row of resultset */ #include "dbpostgresql.h" /*Open - opens cursor and retrieves resultset from connection Output: False on error*/ Bool DBCursor_POSTGRESQL::open(DBConnection *newconnection, PGresult *querycursor) { if (!newconnection->getIsConnected()) return False; //store result set connection = newconnection; POSTGRESQL_res = querycursor; //if no result set (could be no records) and there is an error then exit if (POSTGRESQL_res == NULL) return False; //get number of columns and rows recordCount = (unsigned int)PQntuples(POSTGRESQL_res); fieldCount = PQnfields(POSTGRESQL_res); //get column info if (!getFieldsInformation()) return False; //fetch first row in result set if (recordCount != 0) first(); return True; } //Close - close cursor and free resources used by cursor void DBCursor_POSTGRESQL::close() { FreeFields(); if (POSTGRESQL_res != NULL) { PQclear(POSTGRESQL_res); POSTGRESQL_res = NULL; } isBOF = False; isEOF = True; recordNum = recordCount = fieldCount = 0; } /// Move to start of query, setting isBOF to true and recordNum to 0 Bool DBCursor_POSTGRESQL::first() { //exit if no more records if (recordCount == 0) return False; recordNum = 0; if (!getRowData()) return False; isBOF = True; isEOF = False; return True; } /// Move to end of query, setting isEOF to true and recordNum to recordCount - 1 (the last record) Bool DBCursor_POSTGRESQL::last() { if (recordCount == 0) return False; recordNum = recordCount - 1; if (!getRowData()) return False; isBOF = False; isEOF = True; return True; } /// Move to next record if one exists. If moving to the new record would take us beyond /// the last record then set isEOF to true, and remain on the last record. Bool DBCursor_POSTGRESQL::next() { if (recordCount == 0 || isEOF == True) return False; isBOF = False; recordNum++; if (recordNum == recordCount) { isEOF = true; recordNum = recordCount - 1; return False; } getRowData(); return True; } Bool DBCursor_POSTGRESQL::move(int p_record_index) { if (recordCount == 0) return False; if (p_record_index < 0) return False; else if (p_record_index > recordCount - 1) return False; // Not sure how these should behavior here, for now we just do the minimum // and make them false if we know they should be. isBOF = False; isEOF = False; recordNum = p_record_index; getRowData(); return True; } /// Move to previous record if one exists. If already at start of query, do nothing. /// If the new record would take us before the first record then set isBOF to true /// and set recordNum to 0 (the first record). Bool DBCursor_POSTGRESQL::prev() { if (recordCount == 0) return False; if (isBOF) return False; isEOF = false; recordNum--; if (recordNum == -1) { isBOF =True; recordNum = 0; return False; } getRowData(); return True; } /*getFieldsInformation - get column names, types, and info Output: False on error*/ Bool DBCursor_POSTGRESQL::getFieldsInformation() { fields = new (nothrow) DBField *[fieldCount]; for (unsigned int i=0; i< fieldCount; i++) { DBField *tfield = new (nothrow) DBField(); fields[i] = tfield; char* tmpStr; tmpStr = PQfname(POSTGRESQL_res, i); //get field name..truncate if necessary if (strlen(tmpStr) > F_NAMESIZE -6) strncpy(tfield->fieldName, tmpStr, F_NAMESIZE-6); else strcpy(tfield->fieldName, tmpStr); //get field number tfield->fieldNum = i+1; //get max length tfield->maxlength = PQftype(POSTGRESQL_res,i); //get field type..convert database specific type to generic switch (PQftype(POSTGRESQL_res, i)) { case PG_TYPE_BOOL: tfield->fieldType = FT_BOOLEAN; break; case PG_TYPE_CHAR: tfield->fieldType = FT_STRING; break; case PG_TYPE_NAME: tfield->fieldType = FT_STRING; break; case PG_TYPE_CHAR16: tfield->fieldType = FT_STRING; break; case PG_TYPE_INT2: tfield->fieldType = FT_INTEGER; break; case PG_TYPE_INT28: tfield->fieldType = FT_INTEGER; break; case PG_TYPE_INT4: tfield->fieldType = FT_INTEGER; break; case PG_TYPE_TEXT: tfield->fieldType = FT_STRING; break; case PG_TYPE_CHAR2: tfield->fieldType = FT_STRING; break; case PG_TYPE_CHAR4: tfield->fieldType = FT_STRING; break; case PG_TYPE_CHAR8: tfield->fieldType = FT_STRING; break; case PG_TYPE_PATH: tfield->fieldType = FT_STRING; break; case PG_TYPE_FILENAME: tfield->fieldType = FT_STRING; break; case PG_TYPE_FLOAT4: tfield->fieldType = FT_FLOAT; break; case PG_TYPE_FLOAT8: tfield->fieldType = FT_DOUBLE; break; case PG_TYPE_NUMERIC: tfield->fieldType = FT_DOUBLE; break; case PG_TYPE_MONEY: tfield->fieldType = FT_DOUBLE; break; case PG_TYPE_BPCHAR: tfield->fieldType = FT_STRING; break; case PG_TYPE_VARCHAR: tfield->fieldType = FT_STRING; break; case PG_TYPE_DATE: tfield->fieldType = FT_DATE; break; case PG_TYPE_TIME: tfield->fieldType = FT_TIME; break; case PG_TYPE_DATETIME: tfield->fieldType = FT_DATETIME; break; case PG_TYPE_TIMESTAMP: tfield->fieldType = FT_TIMESTAMP; break; case PG_TYPE_TIMESPAN: tfield->fieldType = FT_TIME; break; case PG_TYPE_RELTIME: tfield->fieldType = FT_TIME; break; case PG_TYPE_ABSTIME: tfield->fieldType = FT_DATETIME; break; //Array Types (Changes the type category to array) case PG_TYPE_ARR_BOOL: tfield->fieldType = FT_BOOLEAN; break; case PG_TYPE_ARR_CHAR: tfield->fieldType = FT_STRING; break; case PG_TYPE_ARR_NAME: tfield->fieldType = FT_STRING; break; case PG_TYPE_ARR_INT2: tfield->fieldType = FT_INTEGER; break; case PG_TYPE_ARR_INT4: tfield->fieldType = FT_INTEGER; break; case PG_TYPE_ARR_TEXT: tfield->fieldType = FT_STRING; break; case PG_TYPE_ARR_VARCHAR: tfield->fieldType = FT_STRING; break; case PG_TYPE_ARR_INT8: tfield->fieldType = FT_INTEGER; break; case PG_TYPE_ARR_PATH: tfield->fieldType = FT_STRING; break; case PG_TYPE_ARR_FLOAT4: tfield->fieldType = FT_FLOAT; break; case PG_TYPE_ARR_FLOAT8: tfield->fieldType = FT_DOUBLE; break; case PG_TYPE_ARR_RELTIME: tfield->fieldType = FT_TIME; break; case PG_TYPE_ARR_ABSTIME: tfield->fieldType = FT_DATETIME; break; case PG_TYPE_ARR_NUMERIC: tfield->fieldType = FT_DOUBLE; break; // OK-2007-06-19 case PG_TYPE_ARR_BYTEA: tfield->fieldType = FT_BLOB; break; case PG_TYPE_BYTEA: tfield->fieldType = FT_BLOB; break; default: tfield->fieldType = FT_STRING; } //get column characteristics tfield->isAutoIncrement = False; tfield->isPrimaryKey = False; tfield->isUnique = False; tfield->isNotNull = False; } return True; } /*getRowData - Retrieve the data from the current row. Output: False on error*/ Bool DBCursor_POSTGRESQL::getRowData() { for (unsigned int i=0; i<fieldCount; i++) { fields[i] -> dataSize = PQgetlength(POSTGRESQL_res, recordNum, i); fields[i] -> isNull = PQgetisnull(POSTGRESQL_res, recordNum, i); if (fields[i] -> isNull) fields[i] -> dataSize = 0; fields[i] -> freeBuffer = False; if (fields[i] -> dataSize == 0) continue; if (fields[i] -> fieldType == FT_BLOB) fields[i] -> data = (char *)PQunescapeBytea((unsigned char *)PQgetvalue(POSTGRESQL_res, recordNum, i), (size_t *)&fields[i] -> dataSize); else fields[i] -> data = PQgetvalue(POSTGRESQL_res, recordNum, i); } return True; } |
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