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Example: Reading Objects

#include <stdlib.h>      /* getenv */
#include "oo.h"          /* Objectivity/DB - specific */

int main(int argc, char* argv[])
{
      const char* bootFilePath = getenv("OO_FD_BOOT");
      if ( 0 == bootFilePath ) {
            return 1; // error
      }
      ooMode accessMode = oocRead;
      const char* dbName = "myDB";
      const char* contName = "X";

      // initialize Objectivity
      ooInit();

      // start transaction
      ooTrans trans;
      trans.start();

      // open federation for reading
      ooHandle(ooFDObj) fdH;
      if ( oocSuccess != fdH.open(bootFilePath, accessMode) ) {
            trans.abort();
            return 2; // error
      }

      // open database
      ooHandle(ooDBObj) dbH;
      if ( oocSuccess != dbH.open(fdH, dbName, accessMode) ) {
            trans.abort();
            return 3; // error
      }

      // open container
      ooHandle(ooContObj) contH;
      if ( oocSuccess != contH.open(dbH, contName, accessMode) ) {
            trans.abort();
            return 4; // error
      }

      // initialize iterator
      ooItr(ooObj) objItr;
      if ( oocSuccess != contH.contains(objItr, accessMode) ) {
            trans.abort();
            return 5;
      }
      // iterate over all objects in the container
      while ( objItr.next() ) {
            ooHandle(ooObj) objH = objItr;
            // do something with the object
      }
      // close federation and commit transaction
      fdH.close();
      trans.commit();

      return 0;
}
Page Owner: Jacek Becla
Last Update: June 13, 2002