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     table = dbMgr->openTable(parsedData->getTableName());
  43     if (table == NULL)
  44     {
  45         printError(ErrNotExists, "Unable to open the table:Table not exists");
  46         return ErrNotExists;
  47     }
  48     altType = parsedData->getAlterType();
  49     if(altType == ALTERMODIFY)
  50     {
  51       printError(ErrUnknown, " NOT Done \n");
  52       return ErrUnknown;
  53     }
  54     rv = resolveForAddDropColumn();
  55     return rv;
  56 }
  57
  58 DbRetVal AlterTblStatement::execute(int &rowsAffected)
  59 {
  60     DbRetVal rv = OK;
  61     if( altType == ALTERTABLERENAME)
  62     {
  63        rv = dbMgr->renameTable(parsedData->getTableName(), parsedData->getIndexName());
  64        return rv;
  65     }else if( altType == ALTERFIELDRENAME)
  66     {
  67        rv = dbMgr->renameField(parsedData->getTableName(), parsedData->getIndexName(),parsedData->getPKTableName());
  68        return rv;
  69     }
  70     rv = executeForAddDropColumn(rowsAffected);
  71     return rv;
  72 }
  73
  74 DbRetVal AlterTblStatement::resolveForAddDropColumn()
  75 {
  76     DbRetVal rv = OK;
  77     if( altType == ALTERTABLERENAME || altType == ALTERFIELDRENAME) return OK;
  78     List fNameList = table->getFieldNameList();
  79     FieldList extraFldList = parsedData->getCreFldList() ;
  80     ListIterator fNameIter = fNameList.getIterator();
  81     FieldInfo *info = new FieldInfo();
  82     int fcount = 1; void *valBuf; int ret=0;
  83     Identifier *elem = NULL;
  84     noOfOldTabFld = fNameList.size();
  85     totalFields = noOfOldTabFld + extraFldList.size();
  86     bindFieldValues = (void**) malloc( totalFields * sizeof(char*));
  87     memset(bindFieldValues, 0, totalFields * sizeof(char*));
  88     char fldName[IDENTIFIER_LENGTH];
  89     int i = 1;
  90     while (fNameIter.hasElement())
  91     {
  92         elem = (Identifier*) fNameIter.nextElement();
  93         table->getFieldInfo((const char*)elem->name, info);
  94         Table::getFieldNameAlone(elem->name,fldName);
  95         //TODO :: Should free
  96         valBuf = AllDataType::alloc(info->type, info->length);
  97         table->bindFld(elem->name, valBuf);
  98         if(altType == ALTERDROP && 0 == strcmp(parsedData->getIndexName(),fldName)){
  99             bindFieldValues[totalFields-i] = valBuf; //Store Last
 100             i--;
 101         }
 102         else {
 103             bindFieldValues[fcount-1] = valBuf;
 104             ret = tblDef.addField(fldName,info->type, info->length, info->defaultValueBuf, info->isNull, info->isAutoIncrement);
 105             if( 0 != ret )
 106             {
 107                 printError(ErrUnknown, "Error while adding field");
 108                 rv = ErrUnknown;
 109                 break;
 110             }
 111             fcount++;
 112         }
 113     }
 114     fNameIter.reset();
 115     while (fNameIter.hasElement())
 116     {
 117         delete (Identifier*) fNameIter.nextElement();
 118     }
 119     fNameList.reset();
 120     if(altType == ALTERDROP)
 121     {
 122         delete info;
 123         return rv;
 124     }
 125     FieldIterator iter = extraFldList.getIterator();
 126     FieldName *name = NULL;
 127     ListIterator nIter = parsedData->getFieldNameList().getIterator();
 128     while (iter.hasElement())
 129     {
 130         FieldDef *fDef = iter.nextElement();
 131         nIter.reset();
 132         while (nIter.hasElement())
 133         {
 134             name = (FieldName*)nIter.nextElement();
 135             if (strcmp(name->fldName, fDef->fldName_) == 0) fDef->isNull_ = true;
 136         }
 137         if (!fDef->isDefault_ || fDef->isDefault_ && fDef->defaultValueBuf_[0] == '\0')  {
 138            ret = tblDef.addField(fDef->fldName_, fDef->type_, fDef->length_,
 139                         NULL,fDef->isNull_,fDef->isAutoIncrement_);
 140          } else {
 141             ret = tblDef.addField(fDef->fldName_, fDef->type_, fDef->length_,
 142                         fDef->defaultValueBuf_,fDef->isNull_,fDef->isAutoIncrement_);
 143          }
 144          if( 0 != ret )
 145          {
 146              printError(ErrUnknown, "Error while adding field");
 147              rv = ErrUnknown;
 148              break;
 149        }
 150        valBuf = AllDataType::alloc(fDef->type_, fDef->length_);
 151        bindFieldValues[fcount-1] = valBuf;
 152     }
 153     delete info;
 154     return rv;
 155 }
 156
 157 DbRetVal AlterTblStatement::executeForAddDropColumn(int &rowsAffected)
 158 {
 159     DbRetVal rv = OK;
 160     char tblName[IDENTIFIER_LENGTH];
 161     sprintf(tblName,"%s_temp",parsedData->getTableName());
 162     rv = dbMgr->createTable(tblName, tblDef);
 163     if (rv != OK) return rv;
 164     rv = createIndex(parsedData->getTableName(),tblName);
 165     if (rv != OK){
 166         dbMgr->dropTable(tblName);
 167         return rv;
 168     }
 169     //TODO:Create Foreign Key Info
 170     Table *tempTable = dbMgr->openTable(tblName);
 171     List fNameList = tempTable->getFieldNameList();
 172     ListIterator fNameIter = fNameList.getIterator();
 173     FieldInfo *info = new FieldInfo();
 174     int fcount = 1; void *valBuf;
 175     Identifier *elem = NULL;
 176     while (fNameIter.hasElement())
 177     {
 178         elem = (Identifier*) fNameIter.nextElement();
 179         tempTable->getFieldInfo((const char*)elem->name, info);
 180         valBuf = bindFieldValues[fcount-1];
 181         tempTable->bindFld(elem->name, valBuf);
 182         fcount++;
 183     }
 184     table->setCondition(NULL);
 185     rv = table->execute();
 186     if (rv != OK)
 187     {
 188        dbMgr->closeTable(tempTable);
 189        dbMgr->dropTable(tblName);
 190        return rv;
 191     }
 192     void *tuple = NULL;
 193     while(true)
 194     {
 195         int extraField = totalFields - noOfOldTabFld;
 196         tuple = (char*)table->fetch();
 197         if (tuple == NULL) {break;}
 198         int i=1;
 199         while(extraField--)
 200         {
 201             tempTable->markFldNull(noOfOldTabFld+i);
 202             i++;
 203         }
 204         rv = tempTable->insertTuple();
 205         if (rv != OK) break;
 206     }
 207     if (rv != OK){
 208        dbMgr->closeTable(tempTable);
 209        dbMgr->dropTable(tblName);
 210        return rv;
 211     }
 212     char tblName1[IDENTIFIER_LENGTH];
 213     sprintf(tblName1,"%s_temp2",parsedData->getTableName());
 214     rv = dbMgr->renameTable(parsedData->getTableName(),tblName1);
 215     if (rv != OK){
 216        dbMgr->closeTable(tempTable);
 217        dbMgr->dropTable(tblName);
 218        return rv;
 219     }
 220     rv = dbMgr->renameTable(tblName,parsedData->getTableName());
 221     if (rv != OK){
 222        dbMgr->renameTable(tblName1,parsedData->getTableName());
 223        dbMgr->closeTable(tempTable);
 224        dbMgr->dropTable(tblName);
 225        return rv;
 226     }
 227     rv = dbMgr->dropTable(tblName1);
 228     if (rv != OK){
 229        dbMgr->renameTable(tblName1,parsedData->getTableName());
 230        dbMgr->closeTable(tempTable);
 231        dbMgr->dropTable(tblName);
 232        return rv;
 233     }
 234     return rv;
 235 }
 236 DbRetVal AlterTblStatement::createIndex(const char *oldName,const char *newName)
 237 {
 238     DbRetVal rv=OK;
 239     CatalogTableINDEXFIELD cIndexField(((DatabaseManagerImpl *)dbMgr)->sysDb());
 240     ListIterator iter = cIndexField.getIndexListIterater((char*)oldName);
 241     IndexInfoForDriver *info=NULL;
 242     char name[IDENTIFIER_LENGTH]="";
 243     char indName[IDENTIFIER_LENGTH]="";
 244     char tempIndexName[IDENTIFIER_LENGTH] ="";
 245     sprintf(tempIndexName, "%s_idx1_Primary", oldName);
 246     bool shouldCreateIndex = false;
 247     bool isFirstEntry=true;
 248     HashIndexInitInfo *idxInfo = NULL, *indexInfo2 = NULL;
 249     while(iter.hasElement())
 250     {
 251         if(shouldCreateIndex)
 252         {
 253             if(idxInfo->isPrimary && 0 == strcmp(info->indexName,tempIndexName))
 254                 sprintf(indName, "%s_idx1_Primary", newName);
 255             rv = dbMgr->createIndex(indName, idxInfo);
 256             if (rv != OK)
 257             {
 258                 delete idxInfo;
 259                 return rv;
 260             }
 261             delete idxInfo;
 262             shouldCreateIndex = false;
 263             idxInfo = NULL;
 264         }
 265         info = (IndexInfoForDriver *) iter.nextElement();
 266         if((0 == strcmp(info->indexName,indName)))
 267         {
 268            if(idxInfo) idxInfo->list.append(info->fieldName);
 269            else printf("should not happen\n");
 270         }else{
 271             idxInfo = new HashIndexInitInfo();
 272             strcpy(idxInfo->tableName, newName);
 273             strcpy(indName,info->indexName);
 274             if(!isFirstEntry)shouldCreateIndex =true;
 275             isFirstEntry = false;
 276             idxInfo->indType =(IndexType) info->type;
 277             idxInfo->isPrimary = info->isPrimary ;
 278             idxInfo->isUnique = info->isUnique;
 279             idxInfo->list.append(info->fieldName);
 280         }
 281     }
 282     if(idxInfo->isPrimary && 0 == strcmp(info->indexName,tempIndexName))
 283          sprintf(indName, "%s_idx1_Primary", newName);
 284     rv = dbMgr->createIndex(indName, idxInfo);
 285     if (rv != OK)
 286     {
 287          delete idxInfo;
 288          return rv;
 289     }
 290     delete idxInfo;
 291     return OK;
 292 }
 293
 294
 295 DbRetVal AlterTblStatement::resolveForModifyColumn()
 296 {
 297     DbRetVal rv = OK;
 298     return rv;
 299 }