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errortoString(), null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert); } try { byte[] byteInputData = new byte[1]; int length = 0; for (int x = 1; x <= recordstoregetNumRecords(); x++) { if (recordstoregetRecordSize(x) > byteInputDatalength) { byteInputData = new byte[recordstoregetRecordSize(x)]; } length = recordstoregetRecord(x, byteInputData, 0); } alert = new Alert("Reading", new String(byteInputData, 0, length), null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert);
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} 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)
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{ try { RecordStoredeleteRecordStore("myRecordStore"); } catch (Exception error) { alert = new Alert("Error Removing", errortoString(), null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert); } } } } } J2ME DATA MANAGEMENT
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Listing 8-4 The JAD file for Listing 8-3
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MIDlet-Name: WriteReadExample MIDlet-Version: 10 MIDlet-Vendor: MyCompany MIDlet-Jar-URL: WriteReadExamplejar MIDlet-1: WriteReadExample, , WriteReadExample MicroEdition-Configuration: CLDC-10 MicroEdition-Profile: MIDP-10 MIDlet-JAR-SIZE: 100
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It is common for records to consist of mixed data types such as string, boolean, and integer (see Figure 8-3) Let s say that you are saving information You might store the customer name, customer number, and gender A string is used to store a customer name, an integer to store the customer number, and a boolean to indicate gender
Figure 8-3
A record store typically stores data of multiple data types such as a string, integer, and boolean
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The routine that you ll need to write to save a record of mixed data types is slightly different from the routine in Listing 8-3 that saves string information to the record store Listing 8-5 shows how to write and read mixed data types Listing 8-6 contains the JAD file for this listing Figure 8-4 shows the output of Listing 8-5 You ll notice that Listing 8-5 has basically the same structure as Listing 8-3 This MIDlet writes a string, an integer, and a boolean value to a record store that is created by the MIDlet Once the record is written, the MIDlet reads the context of the record, which is displayed in an alert dialog box The MIDlet begins by declaring references to objects that are used within the MIDlet Instances of these objects are created within the class constructor The MIDlet creates a record store called myRecordStore after retrieving reference to the display Any errors occurring while the record store is being created are caught by the catch {} block and displayed in an alert dialog box Next, the MIDlet creates an array of bytes called outputRecord followed by the creation of the string, integer, and boolean values of the first record Two streams are used to write the record to the record store The first stream is a byte array output
Figure 8-4
Displaying mixed data types read from a record store
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stream created by calling the ByteArrayOutputStream() constructor The other stream a data output stream used to output the byte array output stream is created by calling the DataOutputStream() constructor and passing it reference to the byte array output stream The objective is to write data to a buffer, then write the buffered data to the stream The data stream is then converted to a byte array The byte array is then written to the record store The DataOutputStream class has methods that write specific data types to a buffer Three of these methods are used in this example These are writeUTF() method, writeBoolean() method, and writeInt() method Each is passed the appropriate data The buffered data is placed in the data stream by calling the flush() method The stream is converted to a byte array by calling the toByteArray() method, which returns a reference to the byte array of the stream This reference is passed to the addRecord() method, as described in the previous section, which saves the byte array as a new record in the record store The ByteArrayOutputStream object's internal store is cleared by calling the reset() method Next, the output stream and the data output stream are both closed Any errors occurring while the data is being written to the record store are trapped by the catch {} block and displayed in an alert dialog box The MIDlet then focuses on retrieving the record from the record store This process begins by declaring appropriate references and an array The array size is set to 100 bytes You must be sure that the size of the array is sufficient to hold all the bytes of the record Reading a mixed data type record from a record store is similar to the routine that writes mixed data types First, you create an instance of the ByteArrayInputStream class The constructor of this class is passed the byte array that was just created You also create an instance of the DataInputStream class and pass reference to the ByteArrayInputStream class to the DataInputStream class constructor The routine used to read records from a record store must assume that more than one record exists, and therefore you need to include a for loop so the MIDlet continues to read records from a record store until the last record is read You ll notice that the construction of the for loop is very similar to the for loop in Listing 8-3 to read string data from a record store The getRecord() method is called for each iteration Remember that the value of x is the record ID number of the record you want to retrieve The contents of the record are copied from the record store and into the byte array that is passed to the getRecord() method This places bytes of the record into the input data stream The appropriate method is called to extract the string, integer, and boolean values from the copy of the record in the input data stream and to store those values in the appropriate variable A word of caution: you must read data from the data stream in the order in which the data appears in the record The reset() method is called to enable reuse of the ByteArrayInputStream's buffer The MIDlet then returns to the top of the for loop and evaluates whether or not to read another record from the record store If so, the process begins again If not, the input
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