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