code: public void init(String url, String user, String pass, String driver) {
  		this.driver = StrUtil.isNotBlank(driver) ? driver : DriverUtil.identifyDriver(url);
  		try {
  			Class.forName(this.driver);
  		} catch (ClassNotFoundException e) {
  			throw new DbRuntimeException(e, "Get jdbc driver [{}] error!", driver);
  		}
  		this.url = url;
  		this.user = user;
  		this.pass = pass;
  	}
docs: 初始化
  
  @param url jdbc url
  @param user 用户名
  @param pass 密码
  @param driver JDBC驱动类，传入空则自动识别驱动类
  @since 3.1.2