ndbschemacon.cpp

mysql-5.0.22.tar.gz源码包

/* Copyright (C) 2003 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */



/*********************************************************************
Name:          NdbSchemaCon.cpp
Include:
Link:
Author:        UABMNST Mona Natterkvist UAB/B/SD
               EMIKRON Mikael Ronstrom                         
Date:          020826
Version:       3.0
Description:   Old Interface between application and NDB
Documentation:
Adjust:  980126  UABMNST   First version.
         020826  EMIKRON   New version adapted to new DICT version
         040524  Magnus Svensson - Adapted to not be included in public NdbApi
                                   unless the user wants to use it.

  NOTE: This file is only used as a compatibility layer for old test programs,
        New programs should use NdbDictionary.hpp
*********************************************************************/

#include <ndb_global.h>
#include <NdbApi.hpp>
#include <NdbSchemaCon.hpp>
#include <NdbSchemaOp.hpp>


/*********************************************************************
NdbSchemaCon(Ndb* aNdb);

Parameters:    aNdb: Pointers to the Ndb object 
Remark:        Creates a schemacon object. 
************************************************************************************************/
NdbSchemaCon::NdbSchemaCon( Ndb* aNdb ) :
  theNdb(aNdb),
  theFirstSchemaOpInList(NULL),
  theMagicNumber(0x75318642)
{ 
  theError.code = 0;
}//NdbSchemaCon::NdbSchemaCon()

/*********************************************************************
~NdbSchemaCon();

Remark:        Deletes the connection object. 
************************************************************************************************/
NdbSchemaCon::~NdbSchemaCon()
{
}//NdbSchemaCon::~NdbSchemaCon()

/*********************************************************************
NdbSchemaOp* getNdbSchemaOp();

Return Value    Return a pointer to a NdbSchemaOp object if getNdbSchemaOp was sussesful.
                Return NULL: In all other case. 	
Parameters:     tableId : Id of the database table beeing deleted.
************************************************************************************************/
NdbSchemaOp*
NdbSchemaCon::getNdbSchemaOp()
{ 
  NdbSchemaOp* tSchemaOp;
  if (theFirstSchemaOpInList != NULL) {
    theError.code = 4401;	// Only support one add table per transaction
    return NULL;
  }//if
  tSchemaOp = new NdbSchemaOp(theNdb);
  if ( tSchemaOp == NULL ) {
    theError.code = 4000;	// Could not allocate schema operation
    return NULL;
  }//if
  theFirstSchemaOpInList = tSchemaOp;
  int retValue = tSchemaOp->init(this);
  if (retValue == -1) {
    release();
    theError.code = 4000;	// Could not allocate buffer in schema operation
    return NULL;
  }//if
  return tSchemaOp;
}//NdbSchemaCon::getNdbSchemaOp()

/*********************************************************************
int execute();

Return Value:  Return 0 : execute was successful.
               Return -1: In all other case.  
Parameters :   aTypeOfExec: Type of execute.
Remark:        Initialise connection object for new transaction. 
************************************************************************************************/
int 
NdbSchemaCon::execute()
{
  if(theError.code != 0) {
    return -1;
  }//if

  NdbSchemaOp* tSchemaOp;

  tSchemaOp = theFirstSchemaOpInList;
  if (tSchemaOp == NULL) {
    theError.code = 4402;
    return -1;
  }//if

  if ((tSchemaOp->sendRec() == -1) || (theError.code != 0)) {
    // Error Code already set in other place
    return -1;
  }//if
  
  return 0;
}//NdbSchemaCon::execute()

/*********************************************************************
void release();

Remark:         Release all schemaop.
************************************************************************************************/
void 
NdbSchemaCon::release()
{
  NdbSchemaOp* tSchemaOp;
  tSchemaOp = theFirstSchemaOpInList;
  if (tSchemaOp != NULL) {
    tSchemaOp->release();
    delete tSchemaOp;
  }//if
  theFirstSchemaOpInList = NULL;
  return;
}//NdbSchemaCon::release()

#include <NdbError.hpp>

static void
update(const NdbError & _err){
  NdbError & error = (NdbError &) _err;
  ndberror_struct ndberror = (ndberror_struct)error;
  ndberror_update(&ndberror);
  error = NdbError(ndberror);
}

const 
NdbError & 
NdbSchemaCon::getNdbError() const {
  update(theError);
  return theError;
}