Sleepycat -> BerkeleyDBname change; incomplete code update

1 files changed, 60 insertions, 0 deletions

diff --git a/examples/berkeleydb_example.py b/examples/berkeleydb_example.py
new file mode 100644
index 00000000..eec5464e
--- /dev/null
+++ b/examples/berkeleydb_example.py
@@ -0,0 +1,60 @@
+"""
+A simple example showing how to use a BerkeleyDB store to do on-disk
+persistence.
+"""
+
+from rdflib import ConjunctiveGraph, Namespace, Literal
+from rdflib.store import NO_STORE, VALID_STORE
+
+from tempfile import mktemp
+
+if __name__ == "__main__":
+    path = mktemp()
+
+    # Open previously created store, or create it if it doesn't exist yet
+    graph = ConjunctiveGraph("BerkeleyDB")
+
+    rt = graph.open(path, create=False)
+
+    if rt == NO_STORE:
+        # There is no underlying BerkeleyDB infrastructure, so create it
+        graph.open(path, create=True)
+    else:
+        assert rt == VALID_STORE, "The underlying store is corrupt"
+
+    print("Triples in graph before add:", len(graph))
+
+    # Now we'll add some triples to the graph & commit the changes
+    EG = Namespace("http://example.net/test/")
+    graph.bind("eg", EG)
+
+    graph.add((EG["pic:1"], EG.name, Literal("Jane & Bob")))
+    graph.add((EG["pic:2"], EG.name, Literal("Squirrel in Tree")))
+
+    graph.commit()
+
+    print("Triples in graph after add:", len(graph))
+
+    # display the graph in Turtle
+    print(graph.serialize())
+
+    # close when done, otherwise BerkeleyDB will leak lock entries.
+    graph.close()
+
+    graph = None
+
+    # reopen the graph
+    graph = ConjunctiveGraph("BerkeleyDB")
+
+    graph.open(path, create=False)
+
+    print("Triples still in graph:", len(graph))
+
+    graph.close()
+
+    # Clean up the temp folder to remove the BerkeleyDB database files...
+    import os
+
+    for f in os.listdir(path):
+        os.unlink(path + "/" + f)
+    os.rmdir(path)