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<TITLE>Writing Advanced Applications, Chapter 3: Data and Transaction Management</TITLE>
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<H2>Writing Advanced Applications<BR>
<FONT SIZE="3">Chapter 3: Data and Transaction Management</FONT></H2>
<FONT SIZE="-1">[<A HREF="code5.html"><<BACK</A>] [<A HREF="index.html#contents">CONTENTS</A>] [<A HREF="bmp3.html">NEXT>></A>]</FONT></DIV>
<P>
When you use the Enterprise JavaBeans<FONT SIZE="-2"><SUP>TM</SUP></FONT> architecture,
data is written to and read from the database without
your writing any SQL code to do it. But what if you do not
want to store the data in a database, or want to
write your own SQL commands, or manage transactions? You can
override the built-in container-managed persistence and
implement Bean-managed persistence using your own data
storage and transaction management code.
<P>
Bean-managed persistence comes in useful when you want more
control than the container-managed persistence provides.
For example you might want to override the default of most containers
to map the data in one Bean to one row in a table, implement your own
<CODE>finder</CODE> methods, or customize caching.
<P>
This chapter presents two versions of the <CODE>RegistrationBean</CODE>
class from Chapter 2. One version reads user data from and writes it to
a file using serialized input and output streams. The other version
provides its own SQL commands for reading from and writing to the database.
It also explains how you can write your own transaction management
code.
<UL>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="bmp3.html">Bean-Managed Persistence and the
JDBC<FONT SIZE="-2"><SUP>TM</SUP></FONT> Platform</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="bmp4.html">Managing Transactions</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="bmp5.html">Bean-Managed finder Methods</A></FONT>
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<TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Bean-Managed Persistence and the
JDBC Platform</FONT></TD>
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<A HREF="bmp3.html#connect">Connect to Database</A></FONT>
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<A HREF="bmp3.html#find">Find Method</A></FONT>
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<FONT FACE="Verdana, Arial, Helvetica, sans-serif">Transaction Management</FONT></TD>
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<A HREF="bmp4.html#why">Why Manage Transactions?</A></FONT>
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<FONT FACE="Verdana, Arial, Helvetica, sans-serif">Bean-Managed finder Methods</FONT></TD>
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