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MIDP: Persistant Storage

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Jussi Pohjolainen
Jussi Pohjolainen

The document discusses persistent storage in MIDP programming using Record Stores. Record Stores allow data to be saved automatically on mobile devices without a "Save As" function. Record Stores can be opened, records can be added, retrieved, replaced, and deleted from them. Enumerations and filters can be used to retrieve filtered records from a Record Store.

Education
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MIDP Development: Persistent Storage Jussi Pohjolainen TAMK University of Applied Sciences
Persistent Storage ,[object Object],[object Object],[object Object],[object Object]
Record Store MIDlet MIDlet Suite MIDlet Suite Device Persistent Storage RAM, Flash ROM, etc MIDlet MIDlet MIDlet Record Store Record Store Record Store Record Store
Handling Record Store ,[object Object],[object Object],[object Object],[object Object]
Closing and Deleting ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Record Store's other methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RecordStore int id byte [] data RecordStore consists of Records RecordStore int id byte [] data int id byte [] data int id byte [] data
Handling Records ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Getting the Record ,[object Object],[object Object],[object Object],[object Object]
Deleting and Replacing a Record ,[object Object],[object Object],[object Object],[object Object]
Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What happens if addRecord fails? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Solution ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Record Store Events ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Retrieving results from the RecordStore: Enumeration ,[object Object],[object Object],[object Object],[object Object]
RecordFilter ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RecordComparator ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Enumeration ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Can be also null!
Enumeration example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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MIDP: Persistant Storage

  • 1. MIDP Development: Persistent Storage Jussi Pohjolainen TAMK University of Applied Sciences
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  • 3. Record Store MIDlet MIDlet Suite MIDlet Suite Device Persistent Storage RAM, Flash ROM, etc MIDlet MIDlet MIDlet Record Store Record Store Record Store Record Store
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  • 7. RecordStore int id byte [] data RecordStore consists of Records RecordStore int id byte [] data int id byte [] data int id byte [] data
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