static DbTypeParser getDbTypeParser() {
        if (dbTypeParser == null) {
            synchronized (JdbcUtils.class) {
                if (dbTypeParser == null) {
                    dbTypeParser = EnhancedServiceLoader.load(DbTypeParser.class, SqlParserType.SQL_PARSER_TYPE_DRUID);
                }
            }
        }
        return dbTypeParser;
    }
@Test
    public void testDbTypeParserLoading() {
        DbTypeParser dbTypeParser = JdbcUtils.getDbTypeParser();
        Assertions.assertNotNull(dbTypeParser);
    }