include/TableImpl.h

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by www.databasecache.com                           *
   3  *   Contact: praba_tuty@databasecache.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 #ifndef TABLE_IMPL_H
  17 #define TABLE_IMPL_H
  18 #include<os.h>
  19 #include<DataType.h>
  20 #include<Transaction.h>
  21 #include<Database.h>
  22 #include<Index.h>
  23 #include<CatalogTables.h>
  24 #include<Info.h>
  25 #include<Debug.h>
  26 #include<DatabaseManagerImpl.h>
  27 #include<Predicate.h>
  28 #include<AggTableImpl.h>//for AggType
  29 #ifndef SCANTYPE
  30 enum ScanType
  31 {
  32     fullTableScan = 0,
  33     hashIndexScan,
  34     treeIndexScan,
  35     unknownScan
  36 };
  37 #define SCANTYPE
  38 #endif
  39
  40 static char ScanTypeNames[][10] =
  41 {
  42     "TableScan", "HashScan", "TreeScan", "Invalid"
  43 };
  44
  45 class Predicate;
  46
  47 class TupleIterator
  48 {
  49     Predicate *pred_;
  50     ScanType scanType_;
  51     ChunkIterator *cIter;
  52     BucketIter *bIter;
  53     TreeIter *tIter;
  54     IndexInfo *info;
  55     char *keyBuffer;
  56     char *keyPtr;
  57     ComparisionOp op;
  58     void *chunkPtr_;
  59     int procSlot;
  60     bool isBetween;
  61     bool isPointLook;
  62     bool shouldNullCheck;
  63     bool isClosed;
  64     TupleIterator() { }
  65     public:
  66     TupleIterator(Predicate *p, ScanType t, IndexInfo *i, void *cptr, int pslot,bool between , bool isPtLook,bool nullflag)
  67     { bIter = new BucketIter();
  68       cIter = new ChunkIterator();;
  69       tIter = new TreeIter();
  70       keyBuffer = NULL;
  71       pred_ = p ; scanType_ = t; info = i; chunkPtr_ = cptr;
  72       isClosed =true;
  73       procSlot =pslot; isBetween=between; isPointLook=isPtLook; shouldNullCheck=nullflag;
  74     }
  75     DbRetVal setPlan();
  76
  77     ~TupleIterator()
  78         {
  79         if (bIter) { delete bIter; bIter = NULL; }
  80         if (cIter) { delete cIter; cIter = NULL; }
  81         if (tIter) { delete tIter; tIter = NULL; }
  82         if (keyBuffer) { ::free(keyBuffer); keyBuffer = NULL; }
  83     }
  84     bool isIterClosed() { return isClosed; }
  85     bool isBetInvolved(){ return isBetween;}
  86     void setBetInvolved(bool between){ isBetween=between;}
  87     bool isPointLookInvolved(){return isPointLook;}
  88     DbRetVal open();
  89     void* next();
  90     void* prev();//used only for tree iter during deleteTuple
  91     void reset();
  92     DbRetVal close();
  93 };
  94 class TableImpl:public Table
  95 {
  96     private:
  97     LockManager *lMgr_;
  98     Transaction **trans;
  99     //This is pointer to the pointer stored in the
 100     //Transaction manager.
 101     //If the transaction commits/aborts this pointer changes
 102     //and this will get that newly allocated transaction
 103
 104     char tblName_[IDENTIFIER_LENGTH];
 105     int tblID_;
 106     size_t length_; //length of the tuple
 107     int numFlds_;
 108     void* chunkPtr_;
 109     void* vcChunkPtr_;
 110     void *curTuple_; //holds the current tuple ptr. moved during fetch() calls
 111
 112     Predicate *pred_;
 113     List predList;
 114     ScanType scanType_;
 115     //ChunkIterator *iter;
 116     //BucketIter *bIter;
 117
 118     TupleIterator *iter;
 119
 120     bool loadFlag;
 121     char aliasName[IDENTIFIER_LENGTH];
 122
 123     public:
 124     FieldList fldList_;
 125     List bindList_;
 126     void **bindListArray_;
 127     int numBindFlds_;
 128     int numIndexes_;
 129     int numFkRelation_;
 130     char** indexPtr_; // array of index ptrs to the catalog table for the indexes of this table.
 131     IndexInfo **idxInfo;
 132     int useIndex_;//offet in the above array indexPtr_ for scan
 133     bool isPlanCreated;
 134     bool isPointLook;
 135     bool isBetween;
 136     Database *db_;
 137     Database *sysDB_;
 138     void *ptrToAuto;
 139     //Either one of the below is populated based on the no of fields and
 140     //is used for tuple insertions
 141     bool isIntUsedForNULL;
 142     int iNullInfo;
 143     char *cNullInfo;
 144     int iNotNullInfo;
 145     char *cNotNullInfo;
 146     //Table *fkTbl;
 147     List tblList;
 148     List tblFkList;
 149     bool isFkTbl;
 150     bool isPkTbl;
 151     bool shouldNullSearch;
 152     private:
 153
 154     //copy Values from binded buffer to tuple pointed by arg
 155     DbRetVal copyValuesFromBindBuffer(void *tuple, bool isInsert=true);
 156     DbRetVal copyValuesToBindBuffer(void *tuple);
 157     void setNullBit(int fldpos);
 158     void clearNullBit(int fldpos);
 159     DbRetVal insertIndexNode(Transaction *trans, void *indexPtr, IndexInfo *info, void *tuple);
 160     DbRetVal updateIndexNode(Transaction *trans, void *indexPtr, IndexInfo *info, void *tuple);
 161     DbRetVal deleteIndexNode(Transaction *trans, void *indexPtr, IndexInfo *info, void *tuple);
 162     bool isFKTable(){return isFkTbl;};
 163     DbRetVal createPlan();
 164     Chunk* getSystemTableChunk(CatalogTableID id)
 165     {
 166         return sysDB_->getSystemDatabaseChunk(id);
 167     }
 168     DbRetVal trySharedLock(void *curTuple, Transaction **trans);
 169     DbRetVal tryExclusiveLock(void *curTuple, Transaction **trans);
 170
 171
 172     public:
 173     TableImpl() { db_ = NULL; chunkPtr_ = NULL; vcChunkPtr_=NULL; iter = NULL;
 174         idxInfo = NULL; indexPtr_ = NULL; scanType_ = unknownScan;
 175         pred_ = NULL; useIndex_ = -1; numFlds_ = 0; bindListArray_ = NULL;
 176         iNullInfo = 0; cNullInfo = NULL; isIntUsedForNULL = true;
 177         iNotNullInfo = 0; cNotNullInfo = NULL; curTuple_ = NULL;
 178         isPlanCreated = false; loadFlag = false;isFkTbl=false;isPkTbl=false;numFkRelation_=0; shouldNullSearch = false;}
 179     ~TableImpl();
 180
 181     void setDB(Database *db) { db_ = db; }
 182     Database* getDB() { return db_;}
 183     void setSystemDB(Database *db) { sysDB_ = db; }
 184     void setLockManager(LockManager *lmgr) { lMgr_ = lmgr; }
 185     void setTrans(Transaction **t) { trans = t; }
 186     inline void setCurTuple(void *tuple){ curTuple_=tuple; }
 187     DataType getFieldType(const char *name)
 188         { return fldList_.getFieldType(name);   }
 189     int getFieldOffset(const char *name)
 190         { return fldList_.getFieldOffset(name); }
 191     size_t getFieldLength(const char *name)
 192         { return fldList_.getFieldLength(name); }
 193     int getNumFields() { return numFlds_; }
 194     void fillFieldInfo(int pos, void* val)
 195         { return fldList_.fillFieldInfo(pos,val); }
 196
 197     DbRetVal getFieldInfo(const char *fieldName,  FieldInfo *&info)
 198     {
 199         char tblName[IDENTIFIER_LENGTH];
 200         char fldName[IDENTIFIER_LENGTH];
 201         getTableNameAlone((char*)fieldName, tblName);
 202         getFieldNameAlone((char*)fieldName, fldName);
 203         if (0 == strcmp(tblName, "") || 0 ==strcmp(tblName, getName()) ||
 204             0 == strcmp(tblName, getAliasName()))
 205             return fldList_.getFieldInfo(fldName, info);
 206         else
 207             return ErrNotExists;
 208     }
 209
 210     List getFieldNameList();
 211
 212     // search predicate
 213      void setCondition(Condition *p);
 214      //{ isPlanCreated = false; if (p) pred_ = p->getPredicate(); else pred_ = NULL;}
 215
 216     //binding
 217     DbRetVal bindFld(const char *name, void *val);
 218     void *getBindFldAddr(const char *name);
 219     int getFldPos(char *name);
 220     DbRetVal markFldNull(const char *name);
 221     DbRetVal markFldNull(int colpos);
 222     bool isFldNull(const char *name);
 223     bool isFldNull(int colpos);
 224
 225     void clearFldNull(const char *name);
 226     void clearFldNull(int colpos);
 227     void resetNullinfo();
 228     DbRetVal insertTuple();
 229     DbRetVal updateTuple();
 230
 231     DbRetVal deleteTuple();
 232     int deleteWhere();
 233     int truncate();
 234
 235     DbRetVal execute();
 236     bool isPkTableHasRecord(char *name,TableImpl *fkTbl,bool isInsert);
 237     bool isFkTableHasRecord(char *name,TableImpl *fkTbl);
 238     void* fetch();
 239     void* fetch(DbRetVal &rv);
 240     void* fetchNoBind();
 241     void* fetchNoBind(DbRetVal &rv);
 242     DbRetVal fetchAgg(const char *fldName, AggType aType, void *buf, bool &noRec);
 243
 244     DbRetVal close();
 245     DbRetVal closeScan();
 246
 247
 248     long spaceUsed();
 249     long numTuples();
 250     int pagesUsed();
 251     void printInfo();
 252     void printPlan(int space);
 253
 254     DbRetVal lock(bool shared);
 255     DbRetVal unlock();
 256
 257     DbRetVal setUndoLogging(bool flag) { loadFlag = flag; return OK;}
 258
 259     void printSQLIndexString(FILE *fp, int fd);
 260     void printSQLForeignString();
 261     DbRetVal optimize();
 262     bool isTableInvolved(char *tblName);
 263     bool pushPredicate(Predicate *pred);
 264     void setPredicate(Predicate *pred);
 265     ScanType getScanType() { return scanType_; }
 266     bool hasIndex(char *fldName);
 267     IndexType getIndexType(char *fldName, int* pos);
 268     void addPredicate(char *fName, ComparisionOp op, void *buf);
 269     DbRetVal compact();
 270     DbRetVal compactIndexNode( void *indexPtr);
 271     char* getName() { return tblName_; }
 272     char* getAliasName() { return aliasName; }
 273     void setAliasName(char *name);
 274     void setTableInfo(char *name, int tblid, size_t  length,
 275                        int numFld, int numIdx, void *chunk, void *vcchunk);
 276     void setLoading(bool flag) { loadFlag = flag; }
 277     friend class DatabaseManagerImpl;
 278 };
 279
 280
 281 #endif