public String getSql(String jdbcUrl) {
        if (jdbcUrl.contains(DbTypeEnum.ORACLE.getUrlWords())) {
            return oracle();
        }
        if (jdbcUrl.contains(DbTypeEnum.DM.getUrlWords())) {
            return oracle();
        }
        if (jdbcUrl.contains(DbTypeEnum.MS_SQL.getUrlWords())) {
            return sqlServer();
        }
        if (jdbcUrl.contains(DbTypeEnum.PG_SQL.getUrlWords())) {
            return pgSql();
        }
        return mysql();
    }

    /**
     * mysql
     */
    MYSQL("mysql", "mysql", "select 1"),

    /**
     * pgsql
     */
    PG_SQL("postgresql", "pgsql", "select version()"),

    /**
     * oracle
     */
    ORACLE("oracle", "oracle", "select 1 from dual"),

    /**
     * 达梦（使用oracle的mapping.xml）
     */
    DM("dm", "oracle", "select 1 from dual"),

    /**
     * mssql
     */
    MS_SQL("sqlserver", "mssql", "select 1");

    /**
     * spring.datasource.url中包含的关键字
     */
    private final String urlWords;