Note: Read the Code example disclaimer for important legal information.
///////////////////////////////////////////////////////////////////////////////
//
// Record-Level Access example. This program uses the record-level
// access classes to read records from a file on the system.
//
// Command syntax:
// java RLReadFile system
//
// This program reads the records from CA/400's sample database file
// (QCUSTCDT in library QIWS). If you change this example to update
// records you should make a copy of QCUSTCDT and update the copy.
//
// This source is an example of IBM Toolbox for Java "Record-level access".
//
///////////////////////////////////////////////////////////////////////////////
import java.io.*;
import java.util.*;
import java.math.*;
import com.ibm.as400.access.*;
public class RLReadFile extends Object
{
public static void main(String[] parameters)
{
String system = "";
// Continue only if a system name was specified.
if (parameters.length >= 1)
{
try
{
// Assume the first parameter is the system name.
system = parameters[0];
// Create an AS400 object for the system that has the file.
AS400 as400 = new AS400(system);
// Create a record description for the file. The file is QCUSTCDT
// in library QIWS.
ZonedDecimalFieldDescription customerNumber =
new ZonedDecimalFieldDescription(new AS400ZonedDecimal(6,0),
"CUSNUM");
CharacterFieldDescription lastName =
new CharacterFieldDescription(new AS400Text(8, as400), "LSTNAM");
CharacterFieldDescription initials =
new CharacterFieldDescription(new AS400Text(3, as400), "INIT");
CharacterFieldDescription street =
new CharacterFieldDescription(new AS400Text(13, as400), "STREET");
CharacterFieldDescription city =
new CharacterFieldDescription(new AS400Text(6, as400), "CITY");
CharacterFieldDescription state =
new CharacterFieldDescription(new AS400Text(2, as400), "STATE");
ZonedDecimalFieldDescription zipCode =
new ZonedDecimalFieldDescription(new AS400ZonedDecimal(5,0),
"ZIPCOD");
ZonedDecimalFieldDescription creditLimit =
new ZonedDecimalFieldDescription(new AS400ZonedDecimal(4,0),
"CDTLMT");
ZonedDecimalFieldDescription chargeCode =
new ZonedDecimalFieldDescription(new AS400ZonedDecimal(1,0),
"CHGCOD");
ZonedDecimalFieldDescription balanceDue =
new ZonedDecimalFieldDescription(new AS400ZonedDecimal(6,2),
"BALDUE");
ZonedDecimalFieldDescription creditDue =
new ZonedDecimalFieldDescription(new AS400ZonedDecimal(6,2),
"CDTDUE");
// The record format name should be specified for a DDM file.
// In the case of the QCUSTCDT file, its record format is called CUSREC.
RecordFormat qcustcdt = new RecordFormat("CUSREC");
qcustcdt.addFieldDescription(customerNumber);
qcustcdt.addFieldDescription(lastName);
qcustcdt.addFieldDescription(initials);
qcustcdt.addFieldDescription(street);
qcustcdt.addFieldDescription(city);
qcustcdt.addFieldDescription(state);
qcustcdt.addFieldDescription(zipCode);
qcustcdt.addFieldDescription(creditLimit);
qcustcdt.addFieldDescription(chargeCode);
qcustcdt.addFieldDescription(balanceDue);
qcustcdt.addFieldDescription(creditDue);
// Create the sequential file object that represents the
// file on the system. We use a QSYSObjectPathName object
// to get the name of the file into the correct format.
QSYSObjectPathName fileName = new QSYSObjectPathName("QIWS",
"QCUSTCDT",
"FILE");
SequentialFile file = new SequentialFile(as400, fileName.getPath());
// Let the file object know the format of the records.
file.setRecordFormat(qcustcdt);
// Open the file for read-only access. Specify a blocking
// factor of 10 (the file object will get 10 records when
// it accesses the system for data). Do not use commitment
// control.
file.open(SequentialFile.READ_ONLY,
10,
SequentialFile.COMMIT_LOCK_LEVEL_NONE);
// Read the first record of the file.
Record data = file.readNext();
// Loop while there are records in the file (while we have not
// reached end-of-file).
while (data != null)
{
// Display the record only if balance due is greater than
// zero. In that case display the customer name and
// the balance due. The following code pulls fields out
// of the record by field name. As the field is retrieved
// from the record it is converted from i5/OS format to
// Java format.
if (((BigDecimal)data.getField("BALDUE")).floatValue() > 0.0)
{
System.out.print((String) data.getField("INIT") + " ");
System.out.print((String) data.getField("LSTNAM") + " ");
System.out.println((BigDecimal) data.getField("BALDUE"));
}
// Read the next record in the file.
data = file.readNext();
}
// When there are no more records to read, disconnect from the system.
as400.disconnectAllServices();
}
catch (Exception e)
{
// If any of the above operations failed, print an error message
// and output the exception.
System.out.println("Could not read the file");
System.out.println(e);
}
}
// Display help text when parameters are incorrect.
else
{
System.out.println("");
System.out.println("");
System.out.println("");
System.out.println("Parameters are not correct. Command syntax is:");
System.out.println("");
System.out.println(" RLReadFile as400");
System.out.println("");
System.out.println("Where");
System.out.println("");
System.out.println(" as400 = system that contains the file");
System.out.println("");
System.out.println("For example:");
System.out.println("");
System.out.println(" RLReadFile mySystem");
System.out.println("");
System.out.println("");
System.out.println("Note, this program reads data base file QIWS/QCUSTCDT. ");
System.out.println("");
System.out.println("");
}
System.exit(0);
}
}