Master

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s Thesis 2006 

FACHHOCHSCHULE

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LI Hui 

STUTTGART

TECHNIK

The implementation 

        STUTTGART UNIVERSITY OF APPLIED 

SCIENCES 

4.4 

J2ME Record Management Store (RMS) 

The Mobile Information Device Profile    the platform for mobile Java applications    

provides a mechanism for MIDP applications to persistently store data across multiple 

invocations.  This  persistent  storage  mechanism  can  be  viewed  as  a  simple 

record oriented database  model  and  is called the record management system (RMS), 

through  which  MIDlets  can  persistently  store  data  and  retrieve  it  later.  In  a 

record oriented approach, J2ME RMS comprises multiple record stores. An overview 

of J2ME RMS and MIDlet interfacing is given in Figure 21. 

Record Management System 

Record 

Store 

MIDLet 

MIDLet 

Fig. 21: 

Overview of J2ME RMS and MIDlet interfacing 

Each  record  store  can  be  visualized  as  a  collection  of  records,  which  will  remain 

persistent  across  multiple  invocations  of  the  MIDlet.  A  record  store  is  created  in 

platform dependent locations, like nonvolatile device memory, which are not directly 

exposed to the MIDlets.   

3.4.1  Managing the device database 

MDIP provides the set of classes and Interfaces in the package 

javax.micoredition.rms 

to  work  with  RecordStore  and  this  set  of  API

'

s  are  called  as  RMS.  The 

javax.microedition.rms.RecordStore

  class  represents  a  RMS  record  store.  It  provides 

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