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Writing and Reading Mixed Data Type Records
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Here are the steps required to write and read mixed data type records: 1 Declare references to classes
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2 Create instances of classes and assign those instances to references 3 Open a record store and create a new record store if the record store doesn t exist 4 Display any errors that occur when opening/creating a record store 5 Create data in the appropriate data type 6 Convert data to a byte array output stream 7 Create a data output stream using the byte array output stream 8 Write each column of the record to the data output stream 9 Convert the data output stream to a byte array 10 Write the record to the record store 11 Close the output byte array output stream and the data output stream 12 Display any errors that might occur while writing to the record store 13 Create a buffer of bytes sufficient to hold a record 14 Create a byte array input stream and a data input stream 15 Loop through the record store, copying each column from the record store to a variable 16 Display the data in a dialog box 17 Display any errors that occur when reading records from the record store 18 Close and remove the record store
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stream and input data stream are closed, and the contents of the variables are displayed within an alert dialog box Errors that occur while records are read from the record store are displayed in an alert dialog box The record store is then closed and deleted from the device
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Listing 8-5 Write and read records of mixed data types import import import import public javaxmicroeditionrms*; javaxmicroeditionmidlet*; javaxmicroeditionlcdui*; javaio*; class WriteReadMixedDataTypesExample extends MIDlet implements CommandListener
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{ private Display display; private Alert alert; private Form form; private Command exit; private Command start; private RecordStore recordstore = null; public WriteReadMixedDataTypesExample () { display = DisplaygetDisplay(this); exit = new Command("Exit", CommandSCREEN, 1); start = new Command("Start", CommandSCREEN, 1); form = new Form("Mixed Record"); formaddCommand(exit); formaddCommand(start); formsetCommandListener(this); } public void startApp() { displaysetCurrent(form); } public void pauseApp() { } public void destroyApp( boolean unconditional ) { } public void commandAction(Command command, Displayable displayable) { if (command == exit) { destroyApp(true); notifyDestroyed(); } else if (command == start) { try { recordstore = RecordStoreopenRecordStore( "myRecordStore", true ); } catch (Exception error) { alert = new Alert("Error Creating", errortoString(), null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert);
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} try { byte[] outputRecord; String outputString = "First Record"; int outputInteger = 15; boolean outputBoolean = true; ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); DataOutputStream outputDataStream = new DataOutputStream(outputStream); outputDataStreamwriteUTF(outputString); outputDataStreamwriteBoolean(outputBoolean); outputDataStreamwriteInt(outputInteger); outputDataStreamflush(); outputRecord = outputStreamtoByteArray(); recordstoreaddRecord(outputRecord, 0, outputRecordlength); outputStreamreset(); outputStreamclose(); outputDataStreamclose(); } catch ( Exception error) { alert = new Alert("Error Writing", errortoString(), null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert); } try { String inputString = null; int inputInteger = 0; boolean inputBoolean = false; byte[] byteInputData = new byte[100]; ByteArrayInputStream inputStream = new ByteArrayInputStream(byteInputData); DataInputStream inputDataStream = new DataInputStream(inputStream); for (int x = 1; x <= recordstoregetNumRecords(); x++) { recordstoregetRecord(x, byteInputData, 0); inputString = inputDataStreamreadUTF(); inputBoolean = inputDataStreamreadBoolean(); inputInteger = inputDataStreamreadInt(); inputStreamreset(); } inputStreamclose(); inputDataStreamclose(); alert = new Alert("Reading", inputString + " " +
8:
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inputInteger + " " + inputBoolean, null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert); } catch (Exception error) { alert = new Alert("Error Reading", errortoString(), null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert); } try { recordstorecloseRecordStore(); } catch (Exception error) { alert = new Alert("Error Closing", errortoString(), null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert); } if (RecordStorelistRecordStores() != null) { try { RecordStoredeleteRecordStore("myRecordStore"); } catch (Exception error) { alert = new Alert("Error Removing", errortoString(), null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert); } } } } }
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Listing 8-6 The JAD file for Listing 8-5
MIDlet-Name: WriteReadMixedDataTypesExample MIDlet-Version: 10 MIDlet-Vendor: MyCompany MIDlet-Jar-URL: WriteReadMixedDataTypesExamplejar MIDlet-1: WriteReadMixedDataTypesExample, ,
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