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