Hi all,
I'm using postgis as my spatial data store. I need to change some field in
the database, and the new value to set depends on the old value. But I
found that, the Feature I got using FeatureWriter.next() method with all
null value, so I can't get the old value of some fields. Here is some code
of mine:
DataStore dataStore = DataStoreFinder.getDataStore(params);
Transaction transaction = new DefaultTransaction("Modify");
FeatureWriter<SimpleFeatureType, SimpleFeature> writer =
dataStore.getFeatureWriter("map", transaction);
while (writer.hasNext()) {
SimpleFeature feature = writer.next(); // The feature get here with
null values, I hope it contain the old values.
// Something to modify the feautre
writer.write();
}
transaction.commit();
transaction.close();
writer.close();
How can I get the old values before I want to write to data store?
Thanks in advance.
--
Zheng Xudong
State Key Laboratory of Software Development Environment
School of Computer Science and Engineer, BeiHang University
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