Changes between Version 5 and Version 6 of rfc13_createfeatures

Timestamp:

May 16, 2007, 12:16:15 AM (17 years ago)

Author:

Kosta

Comment:

DeleteFeatures() added

rfc13_createfeatures

@@ -1 @@
-'''RFC 13: Improved Feature Insertion Performance'''
+'''RFC 13: Improved Feature Insertion/Update/Delete Performance in Batch Mode'''
 
     Author: Konstantin Baumann[[BR]]
@@ -7 +7 @@
 '''Summary'''
 
-Some OGR drivers can dramatically increase the speed of and optimize the insertion of a set of features, if the driver knows, that there is a whole set of features that should/could be inserted or updated at once (instead of just one by one).
+Some OGR drivers can dramatically increase the speed of and optimize the insertion, update, and deletion of a set of features, if the driver knows, that there is a whole set of features that should/could be inserted, updated, or deleted at once (instead of just one by one).
 
 '''!CreateFeatures()'''
@@ -59 +59 @@
 Individual drivers can override the default implementation and can implement an optimized algorithm for updating a set of features.
 
+'''!DeleteFeatures()'''
+
+The following new virtual method is added to the OGRLayer class, with an analogous C function:
+{{{
+virtual OGRErr DeleteFeatures( OGRFeature** papoFeatures, int iFeatureCount );
+}}}
+
+A default implementation is given as below:
+{{{
+OGRErr OGRLayer::DeleteFeatures(
+    OGRFeature **papoFeatures,
+    int iFeatureCount
+) {
+    for(int i = 0; i < iFeatureCount; ++i) {
+        OGRErr error = DeleteFeature( papoFeatures[i] );
+        if( error != OGRERR_NONE ) return error;
+    }
+    return OGRERR_NONE;
+}
+}}}
+
+This triggers the old behavior of an unoptimized deletion.
+
+Individual drivers can override the default implementation and can implement an optimized algorithm for deleting a set of features.
+
 '''Additional Notes'''
 
@@ -74 +99 @@
 
 14-May-2007: initial version created[[BR]]
-15-May-2007: !SetFeatures() added
+15-May-2007: !SetFeatures() added[[BR]]
+16-May-2007: !DeleteFeatures() added[[BR]]