支持Oracle CURSOR表达式

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@948 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/sql/parser/Token.java

@@ -106,6 +106,7 @@ public enum Token {
     EXTRACT("EXTRACT"),
     TIMESTAMP("TIMESTAMP"),
     DATE("DATE"),
+    CURSOR("CURSOR"),
 
     EOF, 
     ERROR,