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