Deleting Entity Objects

The simplest way to remove an object from your entity store is to delete it by its primary index. For example, using the SimpleDA class that we created earlier in this document (see SimpleDA.class), you can delete the SimpleEntityClass object with a primary key of keyone as follows:


You can also delete objects by their secondary keys. When you do this, all objects related to the secondary key are deleted, unless the key is a foreign object.

For example, the following deletes all SimpleEntityClass with a secondary key of skeyone:


You can delete any single object by positioning a cursor to that object and then calling the cursor's delete() method.

PrimaryIndex<String,SimpleEntityClass> pi =
    store.getPrimaryIndex(String.class, SimpleEntityClass.class);

SecondaryIndex<String,String,SimpleEntityClass> si = 
    store.getSecondaryIndex(pi, String.class, "sKey");

EntityCursor<SimpleEntityClass> sec_cursor = 

try {
    SimpleEntityClass sec;
    Iterator<SimpleEntityClass> i = sec_cursor.iterator();
    while (sec = i.nextDup() != null) {
        if (sec.getSKey() == "some value") {
// Always make sure the cursor is closed when we are done with it.
} finally {
    sec_cursor.close(); } 

Finally, if you are indexing by foreign key, then the results of deleting the key is determined by the foreign key constraint that you have set for the index. See Foreign Key Constraints for more information.