Implement Debug for DB

src/rocksdb.rs

@@ -22,6 +22,7 @@ use std::ops::Deref;
 use std::path::Path;
 use std::slice;
 use std::str::from_utf8;
+use std::fmt;
 
 use self::libc::size_t;
 
@@ -784,6 +785,12 @@ impl Drop for DB {
     }
 }
 
+impl fmt::Debug for DB {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "RocksDB {{ path: {:?} }}", self.path())
+    }
+}
+
 impl Writable for WriteBatch {
     /// Insert a value into the database under the given key
     fn put(&self, key: &[u8], value: &[u8]) -> Result<(), String> {