diff --git a/lib/src/occi_extension.dart b/lib/src/occi_extension.dart
index e48481f..143316a 100644
--- a/lib/src/occi_extension.dart
+++ b/lib/src/occi_extension.dart
@@ -224,7 +224,7 @@ class Blob {
   }
   void append(Blob b) native 'OracleBlob_append';
 
-  void copy(Blob b) native 'OracleBlob_copy';
+  void copy(Blob b, int length) native 'OracleBlob_copy';
 
   int length() native 'OracleBlob_length';
 
@@ -252,7 +252,7 @@ class Clob {
   }
   void append(Clob b) native 'OracleClob_append';
 
-  void copy(Clob b) native 'OracleClob_copy';
+  void copy(Clob b, int length) native 'OracleClob_copy';
 
   int length() native 'OracleClob_length';
 
diff --git a/test/.complete_test.dart.swp b/test/.complete_test.dart.swp
new file mode 100644
index 0000000..37ad620
Binary files /dev/null and b/test/.complete_test.dart.swp differ
diff --git a/test/complete_test.dart b/test/complete_test.dart
index 6ab2bcf..60cb5f5 100644
--- a/test/complete_test.dart
+++ b/test/complete_test.dart
@@ -20,10 +20,10 @@ main() {
     var stmt = con.createStatement("BEGIN EXECUTE IMMEDIATE 'DROP TABLE test_table'; EXCEPTION WHEN OTHERS THEN NULL; END;");
     stmt.execute();
     con.commit();
-    stmt = con.createStatement("CREATE TABLE test_table ( test_int int, test_string varchar(255), test_date DATE, test_blob BLOB, test_clob CLOB)");
+    stmt = con.createStatement("CREATE TABLE test_table ( test_int int, test_string varchar(255), test_date DATE, test_blob BLOB, test_clob CLOB, test_clob2 CLOB)");
     stmt.execute();
     con.commit();
-    stmt = con.createStatement("INSERT INTO test_table (test_int,test_string,test_date,test_blob, test_clob) VALUES (:b1, :b2, :b3, EMPTY_BLOB(), EMPTY_CLOB())");
+    stmt = con.createStatement("INSERT INTO test_table (test_int,test_string,test_date,test_blob, test_clob,test_clob2) VALUES (:b1, :b2, :b3, EMPTY_BLOB(), EMPTY_CLOB(), EMPTY_CLOB())");
     stmt.setInt(1,34);
     stmt.setString(2,"hello world");
     stmt.setDate(3,new DateTime(2012, 12, 19, 34, 35, 36));
@@ -107,6 +107,29 @@ main() {
     expect(dbblob.length(), equals(10));
     var rlist = dbblob.read(10,1);
     expect(rlist, equals("teststring"));
+  });
+  
+  test('test clob copy', (){
+    var stmt = con.createStatement("SELECT test_clob FROM test_table FOR UPDATE");
+    var results = stmt.executeQuery();
+    results.next(1);
+    oracle.Clob cl = results.getClob(1);
+    cl.write(10,"teststring",1);
+    con.commit();
+    stmt = con.createStatement("SELECT test_clob, test_clob2 FROM test_table FOR UPDATE");
+    results = stmt.executeQuery();
+    results.next(1);
+    cl = results.getClob(1);
+    oracle.Clob cl2 = results.getClob(2);
+    cl2.copy(cl, 4);
+    con.commit();
+    stmt = con.createStatement("SELECT test_clob2 FROM test_table");
+    results = stmt.executeQuery();
+    results.next(1);
+    var dbblob = results.getClob(1);
+    expect(dbblob.length(), equals(4));
+    var rlist = dbblob.read(4,1);
+    expect(rlist, equals("test"));
   }); 
   test('test clob trim', (){
     var stmt = con.createStatement("SELECT test_clob FROM test_table FOR UPDATE");