Get Record Number of a Datasource

How can I get the record number of a view object
<jbo:DataSourceRef id="dsBrowse" reference='<%=request.getParameter("datasource")%>' />
<jbo:RowsetIterate datasource="dsBrowse" changecurrentrow="true">
<jbo:RenderValue datasource="dsBrowse" dataitem="Item" />
</jbo:RowsetIterate>
I want to display the records when the recordcount is >0. In other case I want to display a message about "No Records Found"
So I Wnat somehow the record number of datasource.

Kostas -
Use the getRowCount() method as such:
<% int rowcount = dsBrowse.getRowSet().getRowCount();
if rowcount > 0 { %>
<jbo:RowsetIterate datasource="dsBrowse" changecurrentrow="true">
<jbo:RenderValue datasource="dsBrowse" dataitem="Item" />
</jbo:RowsetIterate>
<% }else{ %>
No records found
<% } %>
Hope this helps,
Lynn
Java Tools Team
How can I get the record number of a view object
<jbo:DataSourceRef id="dsBrowse" reference='<%=request.getParameter("datasource")%>' />
<jbo:RowsetIterate datasource="dsBrowse" changecurrentrow="true">
<jbo:RenderValue datasource="dsBrowse" dataitem="Item" />
</jbo:RowsetIterate>
I want to display the records when the recordcount is >0. In other case I want to display a message about "No Records Found"
So I Wnat somehow the record number of datasource.

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    Hi Does anyone know if I can modify the record number in the random access file hardware.dat for each hardware record each time and update it in hardware.dat to display it? Also why does it say "Record does not exist" if I modify the record number for a hardware and try to update it but could not find that record?
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    // Exercise 14.11: HardwareRecord.java
    package org.egan; // packaged for reuse
    public class HardwareRecord
      private int recordNumber;
      private String toolName;
      private int quantity;
      private double cost;
      // no-argument constructor calls other constructor with default values
      public HardwareRecord()
        this(0,"",0,0.0); // call four-argument constructor
      } // end no-argument HardwareRecord constructor
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        setToolName(tool);
        setQuantity(amount);
        setCost(price);
      } // end four-argument HardwareRecord constructor
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      public void setRecordNumber(int number)
        recordNumber = number;
      } // end method setRecordNumber
      // get record number
      public int getRecordNumber()
        return recordNumber;
      } // end method getRecordNumber
      // set tool name
      public void setToolName(String tool)
        toolName = tool;
      } // end method setToolName
      // get tool name
      public String getToolName()
        return toolName;
      } // end method getToolName
      // set quantity
      public void setQuantity(int amount)
        quantity = amount;
      } // end method setQuantity
      // get quantity
      public int getQuantity()
        return quantity;
      } // end method getQuantity
      // set cost
      public void setCost(double price)
        cost = price;
      } // end method setCost
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      public double getCost()
        return cost;
      } // end method getCost
    } // end class HardwareRecord-------------------------------------------------------------------------------------------------
    // Exercise 14.11: RandomAccessHardwareRecord.java
    // Subclass of HardwareRecord for random-access file programs.
    package org.egan; // package for reuse
    import java.io.RandomAccessFile;
    import java.io.IOException;
    public class RandomAccessHardwareRecord extends HardwareRecord
      public static final int SIZE = 46;
      // no-argument constructor calls other constructor with default values
      public RandomAccessHardwareRecord()
        this(0,"",0,0.0);
      } // end no-argument RandomAccessHardwareRecord constructor
      // initialize a RandomAccessHardwareRecord
      public RandomAccessHardwareRecord(int number, String tool, int amount, double price)
        super(number,tool,amount,price);
      } // end four-argument RandomAccessHardwareRecord constructor
      // read a record from a specified RandomAccessFile
      public void read(RandomAccessFile file) throws IOException
        setRecordNumber(file.readInt());
        setToolName(readName(file));
        setQuantity(file.readInt());
        setCost(file.readDouble());
      } // end method read
      // ensure that name is proper length
      private String readName(RandomAccessFile file) throws IOException
        char name[] = new char[15], temp;
        for(int count = 0; count < name.length; count++)
          temp = file.readChar();
          name[count] = temp;
        } // end for
        return new String(name).replace('\0',' ');
      } // end method readName
      // write a record to specified RandomAccessFile
      public void write(RandomAccessFile file) throws IOException
        file.writeInt(getRecordNumber());
        writeName(file, getToolName());
        file.writeInt(getQuantity());
        file.writeDouble(getCost());
      } // end method write
      // write a name to file; maximum of 15 characters
      private void writeName(RandomAccessFile file, String name) throws IOException
        StringBuffer buffer = null;
        if (name != null)
          buffer = new StringBuffer(name);
        else
          buffer = new StringBuffer(15);
        buffer.setLength(15);
        file.writeChars(buffer.toString());
      } // end method writeName
    } // end RandomAccessHardwareRecord-------------------------------------------------------------------------------------------------
    // Exercise 14.11: CreateRandomFile.java
    // creates random-access file by writing 100 empty records to disk.
    import java.io.IOException;
    import java.io.RandomAccessFile;
    import org.egan.RandomAccessHardwareRecord;
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      private static final int NUMBER_RECORDS = 100;
      // enable user to select file to open
      public void createFile()
        RandomAccessFile file = null;
        try  // open file for reading and writing
          file = new RandomAccessFile("hardware.dat","rw");
          RandomAccessHardwareRecord blankRecord = new RandomAccessHardwareRecord();
          // write 100 blank records
          for (int count = 0; count < NUMBER_RECORDS; count++)
            blankRecord.write(file);
          // display message that file was created
          System.out.println("Created file hardware.dat.");
          System.exit(0);  // terminate program
        } // end try
        catch (IOException ioException)
          System.err.println("Error processing file.");
          System.exit(1);
        } // end catch
        finally
          try
            if (file != null)
              file.close();  // close file
          } // end try
          catch (IOException ioException)
            System.err.println("Error closing file.");
            System.exit(1);
          } // end catch
        } // end finally
      } // end method createFile
    } // end class CreateRandomFile-------------------------------------------------------------------------------------------------
    // Exercise 14.11: CreateRandomFileTest.java
    // Testing class CreateRandomFile
    public class CreateRandomFileTest
       // main method begins program execution
       public static void main( String args[] )
         CreateRandomFile application = new CreateRandomFile();
         application.createFile();
       } // end main
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    // Exercise 14.11: MenuOption.java
    // Defines an enum type for the hardware credit inquiry program's options.
    public enum MenuOption
      // declare contents of enum type
      PRINT(1),
      UPDATE(2),
      NEW(3),
      DELETE(4),
      END(5);
      private final int value; // current menu option
      MenuOption(int valueOption)
        value = valueOption;
      } // end MenuOptions enum constructor
      public int getValue()
        return value;
      } // end method getValue
    } // end enum MenuOption-------------------------------------------------------------------------------------------------
    // Exercise 14.11: FileEditor.java
    // This class declares methods that manipulate hardware account records
    // in a random access file.
    import java.io.EOFException;
    import java.io.File;
    import java.io.IOException;
    import java.io.RandomAccessFile;
    import java.util.Scanner;
    import org.egan.RandomAccessHardwareRecord;
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      RandomAccessFile file; // reference to the file
      Scanner input = new Scanner(System.in);
      // open the file
      public FileEditor(String fileName) throws IOException
        file = new RandomAccessFile(fileName, "rw");
      } // end FileEditor constructor
      // close the file
      public void closeFile() throws IOException
        if (file != null)
          file.close();
      } // end method closeFile
      // get a record from the file
      public RandomAccessHardwareRecord getRecord(int recordNumber)
         throws IllegalArgumentException, NumberFormatException, IOException
        RandomAccessHardwareRecord record = new RandomAccessHardwareRecord();
        if (recordNumber < 1 || recordNumber > 100)
          throw new IllegalArgumentException("Out of range");
        // seek appropriate record in a file
        file.seek((recordNumber - 1) * RandomAccessHardwareRecord.SIZE);
        record.read(file);
        return record;
      } // end method getRecord
      // update record tool name in file
      public void updateRecordToolName(int recordNumber, String newToolName)
         throws IllegalArgumentException, IOException
        RandomAccessHardwareRecord record = getRecord(recordNumber);
        if (record.getRecordNumber() == 0)
          throw new IllegalArgumentException("Record does not exist");
        // seek appropriate record in file
        file.seek((recordNumber - 1) * RandomAccessHardwareRecord.SIZE);
        record.setToolName(newToolName);
        record = new RandomAccessHardwareRecord(
           record.getRecordNumber(), record.getToolName(), record.getQuantity(), record.getCost());
        record.write(file); // write updated record to file
      } // end method updateRecordToolName
      // update record in file
      public void updateRecordQuantity(int recordNumber, int newQuantity)
         throws IllegalArgumentException, IOException
        RandomAccessHardwareRecord record = getRecord(recordNumber);
        if (record.getRecordNumber() == 0)
          throw new IllegalArgumentException("Record does not exist");
        // seek appropriate record in file
        file.seek((recordNumber - 1) * RandomAccessHardwareRecord.SIZE);
        record.setQuantity(newQuantity);
        record = new RandomAccessHardwareRecord(
           record.getRecordNumber(), record.getToolName(), record.getQuantity(), record.getCost());
        record.write(file); // write updated record to file
      } // end method updateRecordQuantity
      // update record in file
      public void updateRecordCost(int recordNumber, double newCost)
         throws IllegalArgumentException, IOException
        RandomAccessHardwareRecord record = getRecord(recordNumber);
        if (record.getRecordNumber() == 0)
          throw new IllegalArgumentException("Record does not exist");
        // seek appropriate record in file
        file.seek((recordNumber - 1) * RandomAccessHardwareRecord.SIZE);
        record.setCost(newCost);
        record = new RandomAccessHardwareRecord(
           record.getRecordNumber(), record.getToolName(), record.getQuantity(), record.getCost());
        record.write(file); // write updated record to file
      } // end method updateRecordCost
      // add record to file
      public void newRecord(int recordNumber, String toolName, int quantity, double cost)
         throws IllegalArgumentException, IOException
        RandomAccessHardwareRecord record = getRecord(recordNumber);
        if (record.getRecordNumber() != 0)
          throw new IllegalArgumentException("Record already exists");
        // seek appropriate record in file
        file.seek((recordNumber - 1) * RandomAccessHardwareRecord.SIZE);
        record = new RandomAccessHardwareRecord(recordNumber, toolName, quantity, cost);
        record.write(file); // write record to file
      } // end method newRecord
      // delete record from file
      public void deleteRecord(int recordNumber) throws IllegalArgumentException, IOException
        RandomAccessHardwareRecord record = getRecord(recordNumber);
        if (record.getRecordNumber() == 0)
          throw new IllegalArgumentException("Account does not exist");
        // seek appropriate record in file
        file.seek((recordNumber - 1) * RandomAccessHardwareRecord.SIZE);
        // create a blank record to write to the file
        record = new RandomAccessHardwareRecord();
        record.write(file);
      } // end method deleteRecord
      // read and display records
      public void readRecords()
        RandomAccessHardwareRecord record = new RandomAccessHardwareRecord();
        System.out.printf("%-10s%-15s%-15s%10s\n","Record","Tool Name","Quantity","Cost");
        try  // read a record and display
          file.seek(0);
          while (true)
            do
              record.read(file);
            while (record.getRecordNumber() == 0);
            // display record contents
            System.out.printf("%-10d%-15s%-15d%10.2f\n",record.getRecordNumber(),
               record.getToolName(), record.getQuantity(), record.getCost());
          } // end while
        } // end try
        catch (EOFException eofException)  // close file
          return;  // end of file was reached
        } // end catch
        catch (IOException ioException)
          System.err.println("Error reading file.");
          System.exit(1);
        } // end catch
      } // end method readRecords
    } // end class FileEditor-------------------------------------------------------------------------------------------------
    // Exercise 14.11: TransactionProcessor.java
    // A transaction processing program using random-access files.
    import java.io.IOException;
    import java.util.NoSuchElementException;
    import java.util.Scanner;
    import org.egan.RandomAccessHardwareRecord;
    public class TransactionProcessor
      private FileEditor dataFile;
      private RandomAccessHardwareRecord record;
      private MenuOption choices[] = {MenuOption.PRINT, MenuOption.UPDATE, MenuOption.NEW,
              MenuOption.DELETE, MenuOption.END};
      private Scanner input = new Scanner(System.in);
      // get the file name and open the file
      private boolean openFile()
        try // attempt to open file
          // call the helper method to open the file
          dataFile = new FileEditor("hardware.dat");
        } // end try
        catch (IOException ioException)
          System.err.println("Error opening file.");
          return false;
        } // end catch
        return true;
      } // end method openFile
      // close file and terminate application
      private void closeFile()
        try // close file
          dataFile.closeFile();
        } // end try
        catch (IOException ioException)
          System.err.println("Error closing file.");
          System.exit(1);
        } // end catch
      } // end method closeFile
      // create, update or delete the record
      private void performAction(MenuOption action)
        int recordNumber = 0;  // record number of record
        String toolName;       // tool name of the hardware instrument
        int quantity;          // total amount of items
        double cost;           // hareware tool price
        int choice;            // choose an update option   
        int newRecordNumber;   // the updated record number
        String newToolName;    // the updated tool name
        int newQuantity;       // the updated quantity
        double newCost;        // the updated cost
        try // attempt to manipulate files based on option selected
          switch(action) // switch based on option selected
            case PRINT:
              System.out.println();
              dataFile.readRecords();
              break;
            case NEW:
              System.out.printf("\n%s%s\n%s\n%s","Enter record number,",
                "tool name, quantity, and cost.","(Record number must be 1 - 100)","? ");
              recordNumber = input.nextInt();  // read record number       
              toolName = input.next();         // read tool name
              quantity = input.nextInt();      // read quantity
              cost = input.nextDouble();       // read cost
              dataFile.newRecord(recordNumber, toolName, quantity, cost); // create new record
              break;
            case UPDATE:
              System.out.print("\nEnter record number to update (1 - 100): ");
              recordNumber = input.nextInt();
              record = dataFile.getRecord(recordNumber);
              if (record.getRecordNumber() == 0)
                System.out.println("Record does not exist.");
              else
                // display record contents
                System.out.printf("%-10d%-12s%-12d%10.2f\n\n", record.getRecordNumber(),
                   record.getToolName(), record.getQuantity(), record.getCost());
                System.out.printf("%s%s","\nEnter 1 to update tool name, ",
                  "2 to update quantity, or 3 to update cost : ");
                choice = input.nextInt();
                if (choice == 1)
                  System.out.print("Enter new record tool name : ");
                  newToolName = input.next();
                  dataFile.updateRecordToolName(recordNumber,newToolName); // update record
                                                                           // tool name            
                  // retrieve updated record
                  record = dataFile.getRecord(recordNumber);
                  // display updated record
                  System.out.printf("%-10d%-12s%-12d%10.2f\n", record.getRecordNumber(),
                     record.getToolName(), record.getQuantity(), record.getCost());
                else if (choice == 2)
                  System.out.print("Enter new record quantity : ");
                  newQuantity = input.nextInt();
                  dataFile.updateRecordQuantity(recordNumber,newQuantity); // update record
                                                                           // quantity             
                  // retrieve updated record
                  record = dataFile.getRecord(recordNumber);
                  // display updated record
                  System.out.printf("%-10d%-12s%-12d%10.2f\n", record.getRecordNumber(),
                     record.getToolName(), record.getQuantity(), record.getCost());
                else if (choice == 3)
                  System.out.print("Enter new record cost : ");
                  newCost = input.nextDouble();
                  dataFile.updateRecordCost(recordNumber,newCost); // update record cost            
                  // retrieve updated record
                  record = dataFile.getRecord(recordNumber);
                  // display updated record
                  System.out.printf("%-10d%-12s%-12d%10.2f\n", record.getRecordNumber(),
                     record.getToolName(), record.getQuantity(), record.getCost());
              } // end else     
              break;
            case DELETE:
              System.out.print("\nEnter an account to delete ( 1 - 100): ");
              recordNumber = input.nextInt();
              dataFile.deleteRecord(recordNumber);  // delete record
              break;
            default:
              System.out.println("Invalid action.");
              break;
          } // end switch
        } // end try
        catch (NumberFormatException format)
          System.err.println("Bad input.");
        } // end catch
        catch (IllegalArgumentException badRecord)
          System.err.println(badRecord.getMessage());
        } // end catch
        catch (IOException ioException)
          System.err.println("Error writing to the file.");
        } // end catch
        catch (NoSuchElementException elementException)
          System.err.println("Invalid input. Please try again.");
          input.nextLine();
        } // end catch
      } // end method performAction
      // enable user to input menu choice
      private MenuOption enterChoice()
        int menuChoice = 1;
        // display available options
        System.out.printf("\n%s\n%s\n%s\n%s\n%s\n%s","Enter your choice",
         "1 - List hardware records", "2 - Update a hardware record",
         "3 - Add a new hardware record", "4 - Delete a hardware record", "5 - End program\n?");
        try
          menuChoice = input.nextInt();
        catch (NoSuchElementException elementException)
          System.err.println("Invalid input.");
          System.exit(1);
        } // end catch
        return choices[menuChoice - 1];  // return choice from user
      } // end enterChoice
      public void processRequests()
        openFile();
        // get user's request
        MenuOption choice = enterChoice();
        while (choice != MenuOption.END)
          performAction(choice);
          choice = enterChoice();
        } // end while
        closeFile();
      } // end method processRequests
    } // end class TransactionProcessor-------------------------------------------------------------------------------------------------
    // Exercise 14.11: TransactionProcessorTest.java
    // Testing the transaction processor.
    public class TransactionProcessorTest
      public static void main(String args[])
         TransactionProcessor application = new TransactionProcessor();
         application.processRequests();
      } // end main
    } // end class TransactionProcessorTest-------------------------------------------------------------------------------------------------
    Below is the sample data to be entered into the random input file hardware.dat :
    Record                     Tool                        Quantity                Cost
    Number                   Name                
       3                      Sander                    18                         35.99
      19                      Hammer                128                      10.00
      26                      Jigsaw                   16                        14.25
      39                      Mower                    10                        79.50
      56                      Saw                        8                          89.99
      76                      Screwdriver            236                      4.99
      81                      Sledgehammer       32                        19.75
      88                      Wrench                      65                        6.48Message was edited by:
    egan128
    Message was edited by:
    egan128
    Message was edited by:
    egan128

    Hi Does anyone know if I can modify the record number
    in the random access file hardware.dat for each
    hardware record each time and update it in
    hardware.dat to display it?If the "record number" is data that is stored in the file, then you can modify it. More precisely: it is possible to modify it.
    The rest of the question had too many incompatible verbs for me to understand it.
    Also why does it say
    "Record does not exist" if I modify the record number
    for a hardware and try to update it but could not
    find that record?"Record does not exist" is a fairly reasonable error message for the situation where a program looks for a record but cannot find it. Are you asking why that particular lump of code actually does that?
    (One thousand lines of code removed)

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