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/**************** tdbvir H Declares Source Code File (.H) **************/
/* Name: TDBVIR.H Version 1.1 */
/* */
/* (C) Copyright to the author Olivier BERTRAND 2006-2014 */
/* */
/* This file contains the VIR classes declare code. */
/***********************************************************************/
typedef class VIRDEF *PVIRDEF;
typedef class TDBVIR *PTDBVIR;
/***********************************************************************/
/* Return the unique column definition to MariaDB. */
/***********************************************************************/
PQRYRES VirColumns(PGLOBAL g, bool info);
/* --------------------------- VIR classes --------------------------- */
/***********************************************************************/
/* VIR: Virtual table used to select constant values. */
/***********************************************************************/
class DllExport VIRDEF : public TABDEF { /* Logical table description */
public:
// Constructor
VIRDEF(void) = default;
// Implementation
const char *GetType(void) override {return "VIRTUAL";}
// Methods
bool DefineAM(PGLOBAL, LPCSTR, int) override {Pseudo = 3; return false;}
int Indexable(void) override {return 3;}
PTDB GetTable(PGLOBAL g, MODE m) override;
protected:
// Members
}; // end of VIRDEF
/***********************************************************************/
/* This is the class declaration for the Virtual table. */
/***********************************************************************/
class DllExport TDBVIR : public TDBASE {
public:
// Constructors
TDBVIR(PVIRDEF tdp);
// Implementation
AMT GetAmType(void) override {return TYPE_AM_VIR;}
// Methods
int GetRecpos(void) override {return N;}
bool SetRecpos(PGLOBAL g, int recpos) override
{N = recpos - 2; return false;}
int RowNumber(PGLOBAL g, bool b = false) override {return N + 1;}
int TestFilter(PFIL filp, bool nop);
// Database routines
PCOL MakeCol(PGLOBAL g, PCOLDEF cdp, PCOL cprec, int n) override;
int Cardinality(PGLOBAL g) override {return (g) ? Size : 1;}
int GetMaxSize(PGLOBAL g) override {return Size;}
bool OpenDB(PGLOBAL g) override;
int ReadDB(PGLOBAL g) override;
int WriteDB(PGLOBAL g) override;
int DeleteDB(PGLOBAL g, int irc) override;
void CloseDB(PGLOBAL g) override {}
protected:
// Members
int Size; // Table size
int N; // The VIR table current position
}; // end of class TDBVIR
/***********************************************************************/
/* Class VIRCOL: VIRTUAL access method column descriptor. */
/***********************************************************************/
class VIRCOL : public COLBLK {
friend class TDBVIR;
public:
// Constructors
VIRCOL(PCOLDEF cdp, PTDB tdbp, PCOL cprec, int i, PCSZ am = "VIRTUAL");
// Implementation
int GetAmType(void) override {return TYPE_AM_VIR;}
// Methods
void ReadColumn(PGLOBAL g) override;
protected:
// Default constructor not to be used
VIRCOL(void) = default;
// No additional members
}; // end of class VIRCOL
/***********************************************************************/
/* This is the class declaration for the VIR column catalog table. */
/***********************************************************************/
class TDBVICL : public TDBCAT {
public:
// Constructor
TDBVICL(PVIRDEF tdp) : TDBCAT(tdp) {}
// Methods
int Cardinality(PGLOBAL g) override {return 2;} // Avoid DBUG_ASSERT
protected:
// Specific routines
PQRYRES GetResult(PGLOBAL g) override;
// Members
}; // end of class TDBVICL
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