storage/connect/colblk.cpp

/************* Colblk C++ Functions Source Code File (.CPP) ************/
/*  Name: COLBLK.CPP  Version 2.2                                      */
/*                                                                     */
/*  (C) Copyright to the author Olivier BERTRAND          1998-2017    */
/*                                                                     */
/*  This file contains the COLBLK class functions.                     */
/***********************************************************************/

/***********************************************************************/
/*  Include relevant MariaDB header file.                  */
/***********************************************************************/
#include "my_global.h"

/***********************************************************************/
/*  Include required application header files                          */
/*  global.h    is header containing all global Plug declarations.     */
/*  plgdbsem.h  is header containing the DB applic. declarations.      */
/***********************************************************************/
#include "global.h"
#include "plgdbsem.h"
#include "tabcol.h"
#include "colblk.h"
#include "xindex.h"
#include "xtable.h"

/***********************************************************************/
/*  COLBLK protected constructor.                                      */
/***********************************************************************/
COLBLK::COLBLK(PCOLDEF cdp, PTDB tdbp, int i)
  {
  Next = NULL;
  Index = i;
//Number = 0;
  ColUse = 0;

  if ((Cdp = cdp)) {
    Name = cdp->Name;
    Format = cdp->F;
    Opt = cdp->Opt;
    Long = cdp->Long;
    Precision = cdp->Precision;
    Freq = cdp->Freq;
    Buf_Type = cdp->Buf_Type;
    ColUse |= cdp->Flags;       // Used by CONNECT
    Nullable = !!(cdp->Flags & U_NULLS);
    Unsigned = !!(cdp->Flags & U_UNSIGNED);
  } else {
    Name = NULL;
    memset(&Format, 0, sizeof(FORMAT));
    Opt = 0;
    Long = 0;
    Precision = 0;
    Freq = 0;
    Buf_Type = TYPE_ERROR;
    Nullable = false;
    Unsigned = false;
  } // endif cdp

  To_Tdb = tdbp;
  Status = BUF_NO;
//Value = NULL;                  done in XOBJECT constructor
  To_Kcol = NULL;
  } // end of COLBLK constructor

/***********************************************************************/
/*  COLBLK constructor used for copying columns.                       */
/*  tdbp is the pointer to the new table descriptor.                   */
/***********************************************************************/
COLBLK::COLBLK(PCOL col1, PTDB tdbp)
  {
  PCOL colp;

  // Copy the old column block to the new one
  *this = *col1;
  Next = NULL;
//To_Orig = col1;
  To_Tdb = tdbp;

  if (trace(2))
    htrc(" copying COLBLK %s from %p to %p\n", Name, col1, this);

  if (tdbp) {
    // Attach the new column to the table block
    if (!tdbp->GetColumns()) {
      tdbp->SetColumns(this);
    } else {
      for (colp = tdbp->GetColumns(); colp->Next; colp = colp->Next) ;
      colp->Next = this;
    } // endelse
  }

  } // end of COLBLK copy constructor

/***********************************************************************/
/*  Reset the column descriptor to non evaluated yet.                  */
/***********************************************************************/
void COLBLK::Reset(void)
  {
  Status &= ~BUF_READ;
  } // end of Reset

/***********************************************************************/
/*  Compare: compares itself to an (expression) object and returns     */
/*  true if it is equivalent.                                          */
/***********************************************************************/
bool COLBLK::Compare(PXOB xp)
  {
  return (this == xp);
  } // end of Compare

/***********************************************************************/
/*  SetFormat: function used to set SELECT output format.              */
/***********************************************************************/
bool COLBLK::SetFormat(PGLOBAL, FORMAT& fmt)
  {
  fmt = Format;

  if (trace(2))
    htrc("COLBLK: %p format=%c(%d,%d)\n",
         this, *fmt.Type, fmt.Length, fmt.Prec);

  return false;
  } // end of SetFormat

/***********************************************************************/
/*  Eval:  get the column value from the last read record or from a    */
/*  matching Index column if there is one.                             */
/***********************************************************************/
bool COLBLK::Eval(PGLOBAL g)
  {
  if (trace(2))
    htrc("Col Eval: %s status=%.4X\n", Name, Status);

  if (!GetStatus(BUF_READ)) {
//  if (To_Tdb->IsNull())
//    Value->Reset();
    if (To_Kcol)
      To_Kcol->FillValue(Value);
    else
      ReadColumn(g);

    AddStatus(BUF_READ);
    } // endif

  return false;
  } // end of Eval

/***********************************************************************/
/*  InitValue: prepare a column block for read operation.              */
/*  Now we use Format.Length for the len parameter to avoid strings    */
/*  to be truncated when converting from string to coded string.       */
/*  Added in version 1.5 is the arguments GetScale() and Domain        */
/*  in calling AllocateValue. Domain is used for TYPE_DATE only.       */
/***********************************************************************/
bool COLBLK::InitValue(PGLOBAL g)
  {
  if (Value)
    return false;                       // Already done

  // Allocate a Value object
  if (!(Value = AllocateValue(g, Buf_Type, Precision,
                              GetScale(), Unsigned, GetDomain())))
    return true;

  AddStatus(BUF_READY);
  Value->SetNullable(Nullable);

  if (trace(2))
    htrc(" colp=%p type=%d value=%p coluse=%.4X status=%.4X\n",
         this, Buf_Type, Value, ColUse, Status);

  return false;
  } // end of InitValue

/***********************************************************************/
/*  SetBuffer: prepare a column block for write operation.             */
/***********************************************************************/
bool COLBLK::SetBuffer(PGLOBAL g, PVAL, bool, bool)
  {
  sprintf(g->Message, MSG(UNDEFINED_AM), "SetBuffer");
  return true;
  } // end of SetBuffer

/***********************************************************************/
/*  GetLength: returns an evaluation of the column string length.      */
/***********************************************************************/
int COLBLK::GetLengthEx(void)
  {
  return Long;
  } // end of GetLengthEx

/***********************************************************************/
/*  ReadColumn: what this routine does is to access the last line      */
/*  read from the corresponding table, extract from it the field       */
/*  corresponding to this column and convert it to buffer type.        */
/***********************************************************************/
void COLBLK::ReadColumn(PGLOBAL g)
{
  sprintf(g->Message, MSG(UNDEFINED_AM), "ReadColumn");
	throw (int)TYPE_COLBLK;
} // end of ReadColumn

/***********************************************************************/
/*  WriteColumn: what this routine does is to access the last line     */
/*  read from the corresponding table, and rewrite the field           */
/*  corresponding to this column from the column buffer and type.      */
/***********************************************************************/
void COLBLK::WriteColumn(PGLOBAL g)
{
  sprintf(g->Message, MSG(UNDEFINED_AM), "WriteColumn");
	throw (int)TYPE_COLBLK;
} // end of WriteColumn

/***********************************************************************/
/*  Make file output of a column descriptor block.                     */
/***********************************************************************/
void COLBLK::Printf(PGLOBAL, FILE *f, uint n)
  {
  char m[64];
  int  i;
  PCOL colp;

  memset(m, ' ', n);        // Make margin string
  m[n] = '\0';

  for (colp = To_Tdb->GetColumns(), i = 1; colp; colp = colp->Next, i++)
    if (colp == this)
      break;

  fprintf(f, "%sR%dC%d type=%d F=%.2s(%d,%d)", m, To_Tdb->GetTdb_No(),
          i, GetAmType(), Format.Type, Format.Length, Format.Prec);
  fprintf(f,
    " coluse=%04X status=%04X buftyp=%d value=%p name=%s\n",
          ColUse, Status, Buf_Type, Value, Name);
  } // end of Printf

/***********************************************************************/
/*  Make string output of a column descriptor block.                   */
/***********************************************************************/
void COLBLK::Prints(PGLOBAL, char *ps, uint)
  {
  sprintf(ps, "R%d.%s", To_Tdb->GetTdb_No(), Name);
  } // end of Prints


/***********************************************************************/
/*  SPCBLK constructor.                                                */
/***********************************************************************/
SPCBLK::SPCBLK(PCOLUMN cp)
       : COLBLK((PCOLDEF)NULL, cp->GetTo_Table()->GetTo_Tdb(), 0)
  {
  Name = (char*)cp->GetName();
  Precision = Long = 0;
  Buf_Type = TYPE_ERROR;
  } // end of SPCBLK constructor

/***********************************************************************/
/*  WriteColumn: what this routine does is to access the last line     */
/*  read from the corresponding table, and rewrite the field           */
/*  corresponding to this column from the column buffer and type.      */
/***********************************************************************/
void SPCBLK::WriteColumn(PGLOBAL g)
{
  sprintf(g->Message, MSG(SPCOL_READONLY), Name);
	throw (int)TYPE_COLBLK;
} // end of WriteColumn

/***********************************************************************/
/*  RIDBLK constructor for the ROWID special column.                   */
/***********************************************************************/
RIDBLK::RIDBLK(PCOLUMN cp, bool rnm) : SPCBLK(cp)
  {
  Precision = Long = 10;
  Buf_Type = TYPE_INT;
  Rnm = rnm;
  *Format.Type = 'N';
  Format.Length = 10;
  } // end of RIDBLK constructor

/***********************************************************************/
/*  ReadColumn: what this routine does is to return the ordinal        */
/*  number of the current row in the table (if Rnm is true) or in the  */
/*  current file (if Rnm is false) the same except for multiple tables.*/
/***********************************************************************/
void RIDBLK::ReadColumn(PGLOBAL g)
  {
  Value->SetValue(To_Tdb->RowNumber(g, Rnm));
  } // end of ReadColumn

/***********************************************************************/
/*  FIDBLK constructor for the FILEID special column.                  */
/***********************************************************************/
FIDBLK::FIDBLK(PCOLUMN cp, OPVAL op) : SPCBLK(cp), Op(op)
  {
//Is_Key = 2; for when the MUL table indexed reading will be implemented.
  Precision = Long = _MAX_PATH;
  Buf_Type = TYPE_STRING;
  *Format.Type = 'C';
  Format.Length = Long;
#if defined(_WIN32)
  Format.Prec = 1;          // Case insensitive
#endif   // _WIN32
  Constant = (!To_Tdb->GetDef()->GetMultiple() &&
              To_Tdb->GetAmType() != TYPE_AM_PLG &&
              To_Tdb->GetAmType() != TYPE_AM_PLM);
  Fn = NULL;
  } // end of FIDBLK constructor

/***********************************************************************/
/*  ReadColumn: what this routine does is to return the current        */
/*  file ID of the table (can change for Multiple tables).             */
/***********************************************************************/
void FIDBLK::ReadColumn(PGLOBAL g)
  {
  if (Fn != To_Tdb->GetFile(g)) {
    char filename[_MAX_PATH];

    Fn = To_Tdb->GetFile(g);
    PlugSetPath(filename, Fn, To_Tdb->GetPath());

    if (Op != OP_XX) {
      char buff[_MAX_PATH];

      Value->SetValue_psz(ExtractFromPath(g, buff, filename, Op));
    } else
      Value->SetValue_psz(filename);

    } // endif Fn

  } // end of ReadColumn

/***********************************************************************/
/*  TIDBLK constructor for the TABID special column.                   */
/***********************************************************************/
TIDBLK::TIDBLK(PCOLUMN cp) : SPCBLK(cp)
  {
//Is_Key = 2; for when the MUL table indexed reading will be implemented.
  Precision = Long = 64;
  Buf_Type = TYPE_STRING;
  *Format.Type = 'C';
  Format.Length = Long;
  Format.Prec = 1;          // Case insensitive
  Constant = (To_Tdb->GetAmType() != TYPE_AM_TBL);
  Tname = NULL;
  } // end of TIDBLK constructor

/***********************************************************************/
/*  ReadColumn: what this routine does is to return the table ID.      */
/***********************************************************************/
void TIDBLK::ReadColumn(PGLOBAL)
  {
  if (Tname == NULL) {
    Tname = (char*)To_Tdb->GetName();
    Value->SetValue_psz(Tname);
    } // endif Tname

  } // end of ReadColumn

/***********************************************************************/
/*  PRTBLK constructor for the PARTID special column.                  */
/***********************************************************************/
PRTBLK::PRTBLK(PCOLUMN cp) : SPCBLK(cp)
  {
//Is_Key = 2; for when the MUL table indexed reading will be implemented.
  Precision = Long = 64;
  Buf_Type = TYPE_STRING;
  *Format.Type = 'C';
  Format.Length = Long;
  Format.Prec = 1;          // Case insensitive
  Constant = true;          // TODO: check whether this is true indeed
  Pname = NULL;
  } // end of PRTBLK constructor

/***********************************************************************/
/*  ReadColumn: what this routine does is to return the partition ID.  */
/***********************************************************************/
void PRTBLK::ReadColumn(PGLOBAL g)
  {
  if (Pname == NULL) {
    const char *p;

    Pname = To_Tdb->GetDef()->GetStringCatInfo(g, "partname", "?");
    p = strrchr(Pname, '#');
    Value->SetValue_psz((p) ? p + 1 : Pname);
    } // endif Pname

  } // end of ReadColumn

/***********************************************************************/
/*  SIDBLK constructor for the SERVID special column.                  */
/***********************************************************************/
SIDBLK::SIDBLK(PCOLUMN cp) : SPCBLK(cp)
  {
//Is_Key = 2; for when the MUL table indexed reading will be implemented.
  Precision = Long = 64;
  Buf_Type = TYPE_STRING;
  *Format.Type = 'C';
  Format.Length = Long;
  Format.Prec = 1;          // Case insensitive
  Constant = (To_Tdb->GetAmType() != TYPE_AM_TBL);
  Sname = NULL;
  } // end of TIDBLK constructor

/***********************************************************************/
/*  ReadColumn: what this routine does is to return the server ID.     */
/***********************************************************************/
void SIDBLK::ReadColumn(PGLOBAL)
  {
//if (Sname == NULL) {
    Sname = To_Tdb->GetServer();
    Value->SetValue_psz(Sname);
//  } // endif Sname

  } // end of ReadColumn