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 *curTuple_; //holds the current tuple ptr. moved during fetch() calls
 110
 111     Predicate *pred_;
 112     List predList;
 113     ScanType scanType_;
 114     //ChunkIterator *iter;
 115     //BucketIter *bIter;
 116
 117     TupleIterator *iter;
 118
 119     bool loadFlag;
 120     char aliasName[IDENTIFIER_LENGTH];
 121
 122     public:
 123     FieldList fldList_;
 124     List bindList_;
 125     void **bindListArray_;
 126     int numBindFlds_;
 127     int numIndexes_;
 128     int numFkRelation_;
 129     char** indexPtr_; // array of index ptrs to the catalog table for the indexes of this table.
 130     IndexInfo **idxInfo;
 131     int useIndex_;//offet in the above array indexPtr_ for scan
 132     bool isPlanCreated;
 133     bool isPointLook;
 134     bool isBetween;
 135     Database *db_;
 136     Database *sysDB_;
 137     void *ptrToAuto;
 138     //Either one of the below is populated based on the no of fields and
 139     //is used for tuple insertions
 140     bool isIntUsedForNULL;
 141     int iNullInfo;
 142     char *cNullInfo;
 143     int iNotNullInfo;
 144     char *cNotNullInfo;
 145     //Table *fkTbl;
 146     List tblList;
 147     List tblFkList;
 148     bool isFkTbl;
 149     bool isPkTbl;
 150     bool shouldNullSearch;
 151     private:
 152
 153     //copy Values from binded buffer to tuple pointed by arg
 154     DbRetVal copyValuesFromBindBuffer(void *tuple, bool isInsert=true);
 155     DbRetVal copyValuesToBindBuffer(void *tuple);
 156     void setNullBit(int fldpos);
 157     void clearNullBit(int fldpos);
 158     DbRetVal insertIndexNode(Transaction *trans, void *indexPtr, IndexInfo *info, void *tuple);
 159     DbRetVal updateIndexNode(Transaction *trans, void *indexPtr, IndexInfo *info, void *tuple);
 160     DbRetVal deleteIndexNode(Transaction *trans, void *indexPtr, IndexInfo *info, void *tuple);
 161     bool isFKTable(){return isFkTbl;};
 162     DbRetVal createPlan();
 163     Chunk* getSystemTableChunk(CatalogTableID id)
 164     {
 165         return sysDB_->getSystemDatabaseChunk(id);
 166     }
 167     DbRetVal trySharedLock(void *curTuple, Transaction **trans);
 168     DbRetVal tryExclusiveLock(void *curTuple, Transaction **trans);
 169
 170
 171     public:
 172     TableImpl() { db_ = NULL; chunkPtr_ = NULL; iter = NULL;
 173         idxInfo = NULL; indexPtr_ = NULL; scanType_ = unknownScan;
 174         pred_ = NULL; useIndex_ = -1; numFlds_ = 0; bindListArray_ = NULL;
 175         iNullInfo = 0; cNullInfo = NULL; isIntUsedForNULL = true;
 176         iNotNullInfo = 0; cNotNullInfo = NULL; curTuple_ = NULL;
 177         isPlanCreated = false; loadFlag = false;isFkTbl=false;isPkTbl=false;numFkRelation_=0; shouldNullSearch = false;}
 178     ~TableImpl();
 179
 180     void setDB(Database *db) { db_ = db; }
 181     Database* getDB() { return db_;}
 182     void setSystemDB(Database *db) { sysDB_ = db; }
 183     void setLockManager(LockManager *lmgr) { lMgr_ = lmgr; }
 184     void setTrans(Transaction **t) { trans = t; }
 185     inline void setCurTuple(void *tuple){ curTuple_=tuple; }
 186     DataType getFieldType(const char *name)
 187         { return fldList_.getFieldType(name);   }
 188     int getFieldOffset(const char *name)
 189         { return fldList_.getFieldOffset(name); }
 190     size_t getFieldLength(const char *name)
 191         { return fldList_.getFieldLength(name); }
 192     int getNumFields() { return numFlds_; }
 193     void fillFieldInfo(int pos, void* val)
 194         { return fldList_.fillFieldInfo(pos,val); }
 195
 196     DbRetVal getFieldInfo(const char *fieldName,  FieldInfo *&info)
 197     {
 198         char tblName[IDENTIFIER_LENGTH];
 199         char fldName[IDENTIFIER_LENGTH];
 200         getTableNameAlone((char*)fieldName, tblName);
 201         getFieldNameAlone((char*)fieldName, fldName);
 202         if (0 == strcmp(tblName, "") || 0 ==strcmp(tblName, getName()) ||
 203             0 == strcmp(tblName, getAliasName()))
 204             return fldList_.getFieldInfo(fldName, info);
 205         else
 206             return ErrNotExists;
 207     }
 208
 209     List getFieldNameList();
 210
 211     // search predicate
 212      void setCondition(Condition *p);
 213      //{ isPlanCreated = false; if (p) pred_ = p->getPredicate(); else pred_ = NULL;}
 214
 215     //binding
 216     DbRetVal bindFld(const char *name, void *val);
 217     void *getBindFldAddr(const char *name);
 218     int getFldPos(char *name);
 219     DbRetVal markFldNull(const char *name);
 220     DbRetVal markFldNull(int colpos);
 221     bool isFldNull(const char *name);
 222     bool isFldNull(int colpos);
 223
 224     void clearFldNull(const char *name);
 225     void clearFldNull(int colpos);
 226     void resetNullinfo();
 227     DbRetVal insertTuple();
 228     DbRetVal updateTuple();
 229
 230     DbRetVal deleteTuple();
 231     int deleteWhere();
 232     int truncate();
 233
 234     DbRetVal execute();
 235     bool isPkTableHasRecord(char *name,TableImpl *fkTbl,bool isInsert);
 236     bool isFkTableHasRecord(char *name,TableImpl *fkTbl);
 237     void* fetch();
 238     void* fetch(DbRetVal &rv);
 239     void* fetchNoBind();
 240     void* fetchNoBind(DbRetVal &rv);
 241     DbRetVal fetchAgg(const char *fldName, AggType aType, void *buf, bool &noRec);
 242
 243     DbRetVal close();
 244     DbRetVal closeScan();
 245
 246
 247     long spaceUsed();
 248     long numTuples();
 249     int pagesUsed();
 250     void printInfo();
 251     void printPlan(int space);
 252
 253     DbRetVal lock(bool shared);
 254     DbRetVal unlock();
 255
 256     DbRetVal setUndoLogging(bool flag) { loadFlag = flag; return OK;}
 257
 258     void printSQLIndexString(FILE *fp, int fd);
 259     void printSQLForeignString();
 260     DbRetVal optimize();
 261     bool isTableInvolved(char *tblName);
 262     bool pushPredicate(Predicate *pred);
 263     void setPredicate(Predicate *pred);
 264     ScanType getScanType() { return scanType_; }
 265     bool hasIndex(char *fldName);
 266     IndexType getIndexType(char *fldName, int* pos);
 267     void addPredicate(char *fName, ComparisionOp op, void *buf);
 268     DbRetVal compact();
 269     DbRetVal compactIndexNode( void *indexPtr);
 270     char* getName() { return tblName_; }
 271     char* getAliasName() { return aliasName; }
 272     void setAliasName(char *name);
 273     void setTableInfo(char *name, int tblid, size_t  length,
 274                        int numFld, int numIdx, void *chunk);
 275     void setLoading(bool flag) { loadFlag = flag; }
 276     friend class DatabaseManagerImpl;
 277 };
 278
 279
 280 #endif