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 enum ScanType
  29 {
  30     fullTableScan = 0,
  31     hashIndexScan,
  32     treeIndexScan,
  33     unknownScan
  34 };
  35
  36 static char ScanTypeNames[][10] =
  37 {
  38     "TableScan", "HashScan", "TreeScan", "Invalid"
  39 };
  40
  41 class Predicate;
  42
  43 class TupleIterator
  44 {
  45     Predicate *pred_;
  46     ScanType scanType_;
  47     ChunkIterator *cIter;
  48     BucketIter *bIter;
  49     TreeIter *tIter;
  50     IndexInfo *info;
  51     void *chunkPtr_;
  52     int procSlot;
  53     bool isBetween;
  54     bool isPointLook;
  55
  56     TupleIterator(){}
  57     public:
  58     TupleIterator(Predicate *p, ScanType t, IndexInfo *i, void *cptr, int pslot,bool between , bool isPtLook)
  59     { bIter = NULL; pred_ = p ; scanType_ = t; info = i; chunkPtr_ = cptr; procSlot =pslot; isBetween=between; isPointLook=isPtLook; }
  60
  61     ~TupleIterator()
  62         {
  63         if (bIter) delete bIter;
  64         bIter = NULL;
  65     }
  66     bool isBetInvolved(){ return isBetween;}
  67     void setBetInvolved(bool between){ isBetween=between;}
  68     bool isPointLookInvolved(){return isPointLook;}
  69     DbRetVal open();
  70     void* next();
  71     void* prev();//used only for tree iter during deleteTuple
  72     DbRetVal close();
  73
  74 };
  75 class TableImpl:public Table
  76 {
  77     private:
  78
  79
  80     LockManager *lMgr_;
  81     Transaction **trans;
  82     //This is pointer to the pointer stored in the
  83     //Transaction manager.
  84     //If the transaction commits/aborts this pointer changes
  85     //and this will get that newly allocated transaction
  86
  87     char tblName_[IDENTIFIER_LENGTH];
  88     int tblID_;
  89     size_t length_; //length of the tuple
  90     int numFlds_;
  91     void* chunkPtr_;
  92     void *curTuple_; //holds the current tuple ptr. moved during fetch() calls
  93
  94     Predicate *pred_;
  95     ScanType scanType_;
  96     //ChunkIterator *iter;
  97     //BucketIter *bIter;
  98
  99     TupleIterator *iter;
 100
 101     bool undoFlag;
 102
 103     public:
 104     FieldList fldList_;
 105     int numIndexes_;
 106     char** indexPtr_; // array of index ptrs to the catalog table for the indexes of this table.
 107     IndexInfo **idxInfo;
 108     int useIndex_;//offet in the above array indexPtr_ for scan
 109     bool isPlanCreated;
 110     bool isPointLook;
 111     bool isBetween;
 112     Database *db_;
 113     Database *sysDB_;
 114
 115     //Either one of the below is populated based on the no of fields and
 116     //is used for tuple insertions
 117     bool isIntUsedForNULL;
 118     int iNullInfo;
 119     char *cNullInfo;
 120     int iNotNullInfo;
 121     char *cNotNullInfo;
 122
 123     private:
 124
 125     //copy Values from binded buffer to tuple pointed by arg
 126     DbRetVal copyValuesFromBindBuffer(void *tuple, bool isInsert=true);
 127     DbRetVal copyValuesToBindBuffer(void *tuple);
 128     void setNullBit(int fldpos);
 129     void clearNullBit(int fldpos);
 130     DbRetVal insertIndexNode(Transaction *trans, void *indexPtr, IndexInfo *info, void *tuple);
 131     DbRetVal updateIndexNode(Transaction *trans, void *indexPtr, IndexInfo *info, void *tuple);
 132     DbRetVal deleteIndexNode(Transaction *trans, void *indexPtr, IndexInfo *info, void *tuple);
 133
 134     DbRetVal createPlan();
 135     Chunk* getSystemTableChunk(CatalogTableID id)
 136     {
 137         return sysDB_->getSystemDatabaseChunk(id);
 138     }
 139
 140     public:
 141     TableImpl() { db_ = NULL; chunkPtr_ = NULL; iter = NULL;
 142         idxInfo = NULL; indexPtr_ = NULL; scanType_ = unknownScan;
 143         pred_ = NULL; useIndex_ = -1; numFlds_ = 0;
 144         iNullInfo = 0; cNullInfo = NULL; isIntUsedForNULL = true;
 145         iNotNullInfo = 0; cNotNullInfo = NULL; curTuple_ = NULL;
 146         isPlanCreated = false; undoFlag = true;}
 147     ~TableImpl();
 148
 149     void setDB(Database *db) { db_ = db; }
 150     Database* getDB() { return db_;}
 151     void setSystemDB(Database *db) { sysDB_ = db; }
 152     void setLockManager(LockManager *lmgr) { lMgr_ = lmgr; }
 153     void setTrans(Transaction **t) { trans = t; }
 154     void setCurTuple(void *tuple){ curTuple_=tuple; }
 155     DataType getFieldType(const char *name)
 156         { return fldList_.getFieldType(name);   }
 157     int getFieldOffset(const char *name)
 158         { return fldList_.getFieldOffset(name); }
 159     size_t getFieldLength(const char *name)
 160         { return fldList_.getFieldLength(name); }
 161
 162     DbRetVal getFieldInfo(const char *fieldName,  FieldInfo *&info)
 163     {
 164         char tblName[IDENTIFIER_LENGTH];
 165         char fldName[IDENTIFIER_LENGTH];
 166         getTableNameAlone((char*)fieldName, tblName);
 167         getFieldNameAlone((char*)fieldName, fldName);
 168         if (0 == strcmp(tblName, "") || 0 ==strcmp(tblName, getName()))
 169             return fldList_.getFieldInfo(fldName, info);
 170         else
 171             return ErrNotExists;
 172     }
 173
 174     List getFieldNameList();
 175
 176     // search predicate
 177      void setCondition(Condition *p)
 178      { isPlanCreated = false; if (p) pred_ = p->getPredicate(); else pred_ = NULL;}
 179
 180     //binding
 181     DbRetVal bindFld(const char *name, void *val);
 182     void *getBindFldAddr(const char *name);
 183     int getFldPos(char *name);
 184     DbRetVal markFldNull(const char *name);
 185     DbRetVal markFldNull(int colpos);
 186     bool isFldNull(const char *name);
 187     bool isFldNull(int colpos);
 188
 189     void clearFldNull(const char *name);
 190     void clearFldNull(int colpos);
 191     void resetNullinfo();
 192     DbRetVal insertTuple();
 193     DbRetVal updateTuple();
 194
 195     DbRetVal deleteTuple();
 196     int deleteWhere();
 197     int truncate();
 198
 199     DbRetVal execute();
 200
 201     void* fetch();
 202     void* fetch(DbRetVal &rv);
 203     void* fetchNoBind();
 204     void* fetchNoBind(DbRetVal &rv);
 205
 206     DbRetVal close();
 207     DbRetVal closeScan();
 208
 209
 210     long spaceUsed();
 211     long numTuples();
 212     int pagesUsed();
 213     void printInfo();
 214     void printPlan(int space);
 215
 216     DbRetVal lock(bool shared);
 217     DbRetVal unlock();
 218
 219     DbRetVal setUndoLogging(bool flag) { undoFlag = flag; }
 220
 221     void printSQLIndexString();
 222     bool isTableInvolved(char *tblName);
 223     bool pushPredicate(Predicate *pred);
 224     void setPredicate(Predicate *pred);
 225     char* getName() { return tblName_; }
 226     void setTableInfo(char *name, int tblid, size_t  length,
 227                        int numFld, int numIdx, void *chunk);
 228     friend class DatabaseManagerImpl;
 229 };
 230
 231
 232 #endif