src/sql/AlterTblStatement.cxx

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Prabakaran Thirumalai   *
   3  *   praba_tuty@yahoo.com   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15   ***************************************************************************/
  16 #include <os.h>
  17 #include <Statement.h>
  18 #include <TableImpl.h>
  19
  20 AlterTblStatement::AlterTblStatement()
  21 {
  22     bindFieldValues = NULL;
  23     table = NULL;
  24     totalFields = 0 ;
  25 }
  26
  27 AlterTblStatement::~AlterTblStatement()
  28 {
  29     if (table) { table->close(); table = NULL; }
  30     if(totalFields){
  31        for(int i=0;i<totalFields;i++)
  32        {
  33            free(bindFieldValues[i]);
  34        }
  35        free(bindFieldValues); bindFieldValues = NULL;
  36     }
  37 }
  38
  39 DbRetVal AlterTblStatement::resolve()
  40 {
  41     DbRetVal rv = OK;
  42     altType = parsedData->getAlterType();
  43     if(altType == ALTERMODIFY)
  44     {
  45       printError(ErrUnknown, " NOT Done \n");
  46       return ErrUnknown;
  47     }
  48     rv = resolveForAddDropColumn();
  49     return rv;
  50 }
  51
  52 DbRetVal AlterTblStatement::execute(int &rowsAffected)
  53 {
  54     DbRetVal rv = OK;
  55     DatabaseManagerImpl *dmgr = (DatabaseManagerImpl *)dbMgr;
  56     IsolationLevel iso = dmgr->txnMgr()->getIsoLevel();
  57     rv = dmgr->txnMgr()->rollback(dmgr->lockMgr());
  58     rv = dmgr->txnMgr()->startTransaction(dmgr->lockMgr(),iso);
  59
  60     if( altType == ALTERTABLERENAME)
  61     {
  62        rv = dbMgr->renameTable(parsedData->getTableName(), parsedData->getIndexName());
  63        return rv;
  64     }else if( altType == ALTERFIELDRENAME)
  65     {
  66         if (strcmp(parsedData->getIndexName(),parsedData->getPKTableName())==0)
  67             return OK;
  68        rv = dbMgr->renameField(parsedData->getTableName(), parsedData->getIndexName(),parsedData->getPKTableName());
  69        return rv;
  70     }else if(ALTERINDEXRENAME == altType){
  71         rv = dbMgr->renameIndex(parsedData->getTableName(), parsedData->getIndexName());
  72         return rv;
  73     }
  74     rv = executeForAddDropColumn(rowsAffected);
  75     return rv;
  76 }
  77
  78 DbRetVal AlterTblStatement::resolveForAddDropColumn()
  79 {
  80     DbRetVal rv = OK;
  81     if( altType == ALTERTABLERENAME || altType == ALTERFIELDRENAME || altType == ALTERINDEXRENAME) return OK;
  82     table = dbMgr->openTable(parsedData->getTableName());
  83     if (table == NULL)
  84     {
  85         printError(ErrNotExists, "Unable to open the table:Table not exists");
  86         return ErrNotExists;
  87     }
  88     List fNameList = table->getFieldNameList();
  89     FieldList extraFldList = parsedData->getCreFldList() ;
  90     ListIterator fNameIter = fNameList.getIterator();
  91     FieldInfo *info = new FieldInfo();
  92     int fcount = 1; void *valBuf; int ret=0;
  93     Identifier *elem = NULL;
  94     noOfOldTabFld = fNameList.size();
  95     totalFields = noOfOldTabFld + extraFldList.size();
  96     bindFieldValues = (void**) malloc( totalFields * sizeof(char*));
  97     memset(bindFieldValues, 0, totalFields * sizeof(char*));
  98     char fldName[IDENTIFIER_LENGTH];
  99     int i = 1;
 100     while (fNameIter.hasElement())
 101     {
 102         elem = (Identifier*) fNameIter.nextElement();
 103         table->getFieldInfo((const char*)elem->name, info);
 104         Table::getFieldNameAlone(elem->name,fldName);
 105         //TODO :: Should free
 106         valBuf = AllDataType::alloc(info->type, info->length);
 107         table->bindFld(elem->name, valBuf);
 108         if(altType == ALTERDROP && 0 == strcmp(parsedData->getIndexName(),fldName)){
 109             bindFieldValues[totalFields-i] = valBuf; //Store Last
 110             i--;
 111         }
 112         else {
 113             bindFieldValues[fcount-1] = valBuf;
 114             ret = tblDef.addField(fldName,info->type, info->length, info->defaultValueBuf, info->isNull, info->isAutoIncrement);
 115             if( 0 != ret )
 116             {
 117                 printError(ErrUnknown, "Error while adding field");
 118                 rv = ErrUnknown;
 119                 break;
 120             }
 121             fcount++;
 122         }
 123     }
 124     fNameIter.reset();
 125     while (fNameIter.hasElement())
 126     {
 127         delete (Identifier*) fNameIter.nextElement();
 128     }
 129     fNameList.reset();
 130     if(altType == ALTERDROP)
 131     {
 132         delete info;
 133         return rv;
 134     }
 135     FieldIterator iter = extraFldList.getIterator();
 136     FieldName *name = NULL;
 137     ListIterator nIter = parsedData->getFieldNameList().getIterator();
 138     while (iter.hasElement())
 139     {
 140         FieldDef *fDef = iter.nextElement();
 141         nIter.reset();
 142         while (nIter.hasElement())
 143         {
 144             name = (FieldName*)nIter.nextElement();
 145             if (strcmp(name->fldName, fDef->fldName_) == 0) fDef->isNull_ = true;
 146         }
 147         if (!fDef->isDefault_ || fDef->isDefault_ && fDef->defaultValueBuf_[0] == '\0')  {
 148            ret = tblDef.addField(fDef->fldName_, fDef->type_, fDef->length_,
 149                         NULL,fDef->isNull_,fDef->isAutoIncrement_);
 150          } else {
 151             ret = tblDef.addField(fDef->fldName_, fDef->type_, fDef->length_,
 152                         fDef->defaultValueBuf_,fDef->isNull_,fDef->isAutoIncrement_);
 153          }
 154          if( 0 != ret )
 155          {
 156              printError(ErrUnknown, "Error while adding field");
 157              rv = ErrUnknown;
 158              break;
 159        }
 160        valBuf = AllDataType::alloc(fDef->type_, fDef->length_);
 161        bindFieldValues[fcount-1] = valBuf;
 162     }
 163     delete info;
 164     return rv;
 165 }
 166
 167 DbRetVal AlterTblStatement::executeForAddDropColumn(int &rowsAffected)
 168 {
 169     DbRetVal rv = OK;
 170     char tblName[IDENTIFIER_LENGTH];
 171     sprintf(tblName,"%s_temp",parsedData->getTableName());
 172     rv = dbMgr->createTable(tblName, tblDef);
 173     if (rv != OK) return rv;
 174     rv = createIndex(parsedData->getTableName(),tblName);
 175     if (rv != OK){
 176         dbMgr->dropTable(tblName);
 177         return rv;
 178     }
 179     //TODO:Create Foreign Key Info
 180     Table *tempTable = dbMgr->openTable(tblName);
 181     List fNameList = tempTable->getFieldNameList();
 182     ListIterator fNameIter = fNameList.getIterator();
 183     FieldInfo *info = new FieldInfo();
 184     int fcount = 1; void *valBuf;
 185     Identifier *elem = NULL;
 186     while (fNameIter.hasElement())
 187     {
 188         elem = (Identifier*) fNameIter.nextElement();
 189         tempTable->getFieldInfo((const char*)elem->name, info);
 190         valBuf = bindFieldValues[fcount-1];
 191         tempTable->bindFld(elem->name, valBuf);
 192         fcount++;
 193     }
 194     table->setCondition(NULL);
 195     rv = table->execute();
 196     if (rv != OK)
 197     {
 198        dbMgr->closeTable(tempTable);
 199        dbMgr->dropTable(tblName);
 200        return rv;
 201     }
 202     void *tuple = NULL;
 203     while(true)
 204     {
 205         int extraField = totalFields - noOfOldTabFld;
 206         tuple = (char*)table->fetch();
 207         if (tuple == NULL) {break;}
 208         int i=1;
 209         while(extraField--)
 210         {
 211             tempTable->markFldNull(noOfOldTabFld+i);
 212             i++;
 213         }
 214         rv = tempTable->insertTuple();
 215         if (rv != OK) break;
 216     }
 217     if (rv != OK){
 218        dbMgr->closeTable(tempTable);
 219        dbMgr->dropTable(tblName);
 220        return rv;
 221     }
 222     char tblName1[IDENTIFIER_LENGTH];
 223     sprintf(tblName1,"%s_temp2",parsedData->getTableName());
 224     rv = dbMgr->renameTable(parsedData->getTableName(),tblName1);
 225     if (rv != OK){
 226        dbMgr->closeTable(tempTable);
 227        dbMgr->dropTable(tblName);
 228        return rv;
 229     }
 230     rv = dbMgr->renameTable(tblName,parsedData->getTableName());
 231     if (rv != OK){
 232        dbMgr->renameTable(tblName1,parsedData->getTableName());
 233        dbMgr->closeTable(tempTable);
 234        dbMgr->dropTable(tblName);
 235        return rv;
 236     }
 237     rv = dbMgr->dropTable(tblName1);
 238     if (rv != OK){
 239        dbMgr->renameTable(tblName1,parsedData->getTableName());
 240        dbMgr->closeTable(tempTable);
 241        dbMgr->dropTable(tblName);
 242        return rv;
 243     }
 244     return rv;
 245 }
 246 DbRetVal AlterTblStatement::createIndex(const char *oldName,const char *newName)
 247 {
 248     DbRetVal rv=OK;
 249     CatalogTableINDEXFIELD cIndexField(((DatabaseManagerImpl *)dbMgr)->sysDb());
 250     ListIterator iter = cIndexField.getIndexListIterater((char*)oldName);
 251     IndexInfoForDriver *info=NULL;
 252     char name[IDENTIFIER_LENGTH]="";
 253     char indName[IDENTIFIER_LENGTH]="";
 254     char tempIndexName[IDENTIFIER_LENGTH] ="";
 255     sprintf(tempIndexName, "%s_idx1_Primary", oldName);
 256     bool shouldCreateIndex = false;
 257     bool isFirstEntry=true;
 258     HashIndexInitInfo *idxInfo = NULL, *indexInfo2 = NULL;
 259     while(iter.hasElement())
 260     {
 261         if(shouldCreateIndex)
 262         {
 263             if(idxInfo->isPrimary && 0 == strcmp(info->indexName,tempIndexName))
 264                 sprintf(indName, "%s_idx1_Primary", newName);
 265             rv = dbMgr->createIndex(indName, idxInfo);
 266             if (rv != OK)
 267             {
 268                 delete idxInfo;
 269                 return rv;
 270             }
 271             delete idxInfo;
 272             shouldCreateIndex = false;
 273             idxInfo = NULL;
 274         }
 275         info = (IndexInfoForDriver *) iter.nextElement();
 276         if((0 == strcmp(info->indexName,indName)))
 277         {
 278            if(idxInfo) idxInfo->list.append(info->fieldName);
 279            else printf("should not happen\n");
 280         }else{
 281             idxInfo = new HashIndexInitInfo();
 282             strcpy(idxInfo->tableName, newName);
 283             strcpy(indName,info->indexName);
 284             if(!isFirstEntry)shouldCreateIndex =true;
 285             isFirstEntry = false;
 286             idxInfo->indType =(IndexType) info->type;
 287             idxInfo->isPrimary = info->isPrimary ;
 288             idxInfo->isUnique = info->isUnique;
 289             idxInfo->list.append(info->fieldName);
 290         }
 291     }
 292     if (idxInfo == NULL) return OK;
 293     if(idxInfo->isPrimary && 0 == strcmp(info->indexName,tempIndexName))
 294          sprintf(indName, "%s_idx1_Primary", newName);
 295     rv = dbMgr->createIndex(indName, idxInfo);
 296     if (rv != OK)
 297     {
 298          delete idxInfo;
 299          return rv;
 300     }
 301     delete idxInfo;
 302     return OK;
 303 }
 304
 305
 306 DbRetVal AlterTblStatement::resolveForModifyColumn()
 307 {
 308     DbRetVal rv = OK;
 309     return rv;
 310 }