public void Snapshot()
{
// modify db
var writeOptions = Native.leveldb_writeoptions_create();
Native.leveldb_put(Database, writeOptions, "key1", "value1");
Native.leveldb_writeoptions_destroy(writeOptions);
// create snapshot
var snapshot = Native.leveldb_create_snapshot(Database);
// modify db again
writeOptions = Native.leveldb_writeoptions_create();
Native.leveldb_put(Database, writeOptions, "key2", "value2");
Native.leveldb_writeoptions_destroy(writeOptions);
// read from snapshot
var readOptions = Native.leveldb_readoptions_create();
Native.leveldb_readoptions_set_snapshot(readOptions, snapshot);
var val1 = Native.leveldb_get(Database, readOptions, "key1");
Assert.AreEqual("value1", val1);
var val2 = Native.leveldb_get(Database, readOptions, "key2");
Assert.IsNull(val2);
Native.leveldb_readoptions_destroy(readOptions);
// release snapshot
Native.leveldb_release_snapshot(Database, snapshot);
snapshot = IntPtr.Zero;
}
public Snapshot(DB db)
{
if (db == null)
{
throw new ArgumentNullException("db");
}
DB = db;
Handle = Native.leveldb_create_snapshot(db.Handle);
}