Download Object oriented databases

Object oriented
databases
By Claudia Buder
21.05.2003
Programming
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Content
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About OODB
Transparent persistence
 Lack
of impedance mismatch
 How to access data
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Database application
Navigation with an object database
ODB using architectures
When an ODBMS should be used
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About object oriented databases
Integration of database capabilities with
object programming language capabilities
 makes database objects appear as
programming language objects
 Most used query language OQL
 Uses also OOA and OOD
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Transparent persistence
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Lack of impedance mismatch
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Data access: e.g. Java
import org.odmg.*;
import java.util.Collection;
Implementation impl = new com.vendor.odmg.Implementation();
Database db = impl.newDatabase();
Transaction txn = impl.newTransaction();
try {
db.open("addressDB", Database.OPEN_READ_WRITE);
txn.begin();
// perform query
OQLQuery query = new OQLQuery(
"select x from Person x where x.name = \"Doug Barry\"");
Collection result = (Collection) query.execute();
Iterator iter = result.iterator();
// iterate over the results
while ( iter.hasNext() )
{
Person person = (Person) iter.next();
// do some addition processing on the person (now shown)
// now traverse to the address object and update its value
person.address.street = "13504 4th Avenue South";
}
txn.commit();
db.close();
}
//exception handling would go here ...
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Database application
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Data collection applications
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Information analysis applications
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Applications handling BLOBs
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Navigation with an object database
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ODB using architectures
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Stand-alone architecture
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Architecture with existing data sources
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When an ODBMS should be used
Business need
 High performance
 Complex data
 Reduction of development and
maintenance costs
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Resources
http://www.servicearchitecture.com/object-orienteddatabases/
 http://www.sei.cmu.edu/str/descriptions/oo
database.html
 http://www.cisco.com/univercd/cc/td/doc/pr
oduct/rtrmgmt/cw2k4mw/mwfm201/mwfmt
op/33oql.html
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Thanks for your attention !
Questions ???
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