从url判断华为gaussdb类别，判断条件从华为官方代码获得，也在实际使用中用过

src/main/java/com/alibaba/druid/util/JdbcUtils.java

@@ -637,6 +637,8 @@ public final class JdbcUtils implements JdbcConstants {
             return DbType.highgo;
         } else if (rawUrl.startsWith("jdbc:pivotal:greenplum:") || rawUrl.startsWith("jdbc:datadirect:greenplum:")) {
             return DbType.greenplum;
+        } else if (rawUrl.startsWith("jdbc:gaussdb:") || rawUrl.startsWith("jdbc:dws:iam:")) {
+            return DbType.gaussdb;
         } else {
             return null;
         }