include/JoinTableImpl.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 JOINTABLE_IMPL_H
  17 #define JOINTABLE_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
  29 #ifndef JOINTYPE
  30 #define JOINTYPE
  31 enum JoinType
  32 {
  33     INNER_JOIN = 1,
  34     LEFT_JOIN,
  35     RIGHT_JOIN,
  36     FULL_JOIN,
  37     UNKNOWN_JOIN
  38 };
  39 #endif
  40
  41 class JoinProjFieldInfo
  42 {
  43     public:
  44     char tabFieldName[IDENTIFIER_LENGTH*2];
  45     char tableName[IDENTIFIER_LENGTH];
  46     char fieldName[IDENTIFIER_LENGTH];
  47     DataType type;
  48     int length;
  49     void *appBuf;
  50     void *bindBuf;
  51     JoinProjFieldInfo()
  52     {
  53         strcpy(tableName,""); strcpy(fieldName, "");
  54         type= typeUnknown; length =0; appBuf= NULL; bindBuf=NULL;
  55     }
  56 };
  57 class JoinCondition
  58 {
  59     public:
  60     char tableName1[IDENTIFIER_LENGTH];
  61     char tableName2[IDENTIFIER_LENGTH];
  62     char fieldName1[IDENTIFIER_LENGTH];
  63     char fieldName2[IDENTIFIER_LENGTH];
  64     DataType type1;
  65     DataType type2;
  66     int length1;
  67     int length2;
  68     void *bindBuf1;
  69     void *bindBuf2;
  70     bool alreadyBinded1;
  71     bool alreadyBinded2;
  72     ComparisionOp op;
  73     JoinCondition()
  74     {
  75         strcpy(tableName1,""); strcpy(fieldName1, "");
  76         strcpy(tableName2,""); strcpy(fieldName2, "");
  77         type1= typeUnknown; length1 =0; bindBuf1=NULL;
  78         type2= typeUnknown; length2 =0; bindBuf2=NULL;
  79         alreadyBinded1=false; alreadyBinded2=false;
  80     }
  81
  82 };
  83 class JoinTableImpl:public Table
  84 {
  85     private:
  86     void *curTuple; //holds the current tuple ptr. moved during fetch() calls
  87     List projList;
  88     Table *leftTableHdl;
  89     Table *rightTableHdl;
  90     bool availableLeft;
  91     bool isFirstFetch;
  92     bool isReturnNull;
  93     bool isOuterJoin;
  94     bool isLeftRecOver;
  95     bool isFirstCall;
  96     bool leftSideFail;
  97
  98     JoinType jType;
  99     ListIterator rsIter;
 100     bool isNestedLoop;
 101     bool rightExhausted;
 102     DbRetVal copyValuesToBindBuffer(void *tuple);
 103     JoinCondition jCondition;
 104     Predicate *pred;
 105     List predList;
 106
 107     public:
 108     JoinTableImpl();
 109     virtual ~JoinTableImpl();
 110
 111     DbRetVal getFieldInfo(const char *fieldName,  FieldInfo *&info);
 112
 113     void setTable(Table *left, Table *right)
 114     { leftTableHdl = left; rightTableHdl = right; }
 115     int getFldPos(char *name){ return 0;}
 116     DbRetVal closeScan();
 117     void setJoinType(JoinType type) { jType = type; }
 118     //binding
 119     DbRetVal bindFld(const char *name, void *val);
 120     //DbRetVal setJoinCondition(const char *fldname1, ComparisionOp op,
 121     //                          const char *fldname2);
 122
 123      void setCondition(Condition *p)
 124      { if (p) pred = p->getPredicate(); else pred = NULL;}
 125
 126     DbRetVal markFldNull(const char *name){ return ErrBadCall;}
 127     DbRetVal markFldNull(int colpos){ return ErrBadCall;}
 128     bool isFldNull(const char *name);
 129     bool isFldNullInt(const char *name);
 130     bool isFldNull(int colpos){return false;}
 131     void clearFldNull(const char *name){}
 132     void clearFldNull(int colpos){}
 133     void resetNullinfo(){ }
 134     DbRetVal insertTuple() { return ErrBadCall; }
 135     DbRetVal updateTuple() { return ErrBadCall; }
 136     DbRetVal deleteTuple() { return ErrBadCall; }
 137     int deleteWhere() { return ErrBadCall; }
 138     int truncate() { return ErrBadCall; }
 139     long spaceUsed() { return 0; }
 140     int pagesUsed() { return 0; }
 141     DbRetVal lock(bool shared) { return ErrBadCall; }
 142     DbRetVal unlock(){ return ErrBadCall; }
 143     DbRetVal setUndoLogging(bool flag) { return ErrBadCall; }
 144     void printSQLIndexString(FILE *fp, int fd){ };
 145     void printSQLForeignString(){}
 146     List getFieldNameList();
 147     char* getName() { return NULL; }
 148     char* getAliasName(){ return NULL; }
 149     void *fetchRightFail();
 150     DbRetVal compact(){ return OK;}
 151     //bool evaluate();
 152     DbRetVal execute();
 153     void* fetch();
 154     void* fetchInt();
 155     void* fetch(DbRetVal &rv);
 156     void* fetchNoBind();
 157     void* fetchNoBind(DbRetVal &rv);
 158     DbRetVal close();
 159
 160     long numTuples();
 161     void printInfo();
 162     void *getBindFldAddr(const char *name);
 163     bool isFKTable(){return false;}
 164     bool isTableInvolved(char *tblName);
 165     bool pushPredicate(Predicate *pred);
 166     void setPredicate(Predicate *pred);
 167     void printPlan(int space);
 168     DbRetVal optimize();
 169     void optimizeRestrict();
 170     ScanType getScanType();
 171     bool hasIndex(char *fname){ return false; }
 172     void* getBindedBuf(char* tName, char*fName);
 173 };
 174
 175
 176 #endif