code: private static <T> String getTableName(Class<T> clazz) {
  		
  		Table tableAnno = clazz.getAnnotation(Table.class);
  		if(tableAnno != null){
  			if(tableAnno.catalog() != null){
  				return tableAnno.catalog() + "." + tableAnno.name();
  			}
  			return tableAnno.name();
  		}
  		//if Table annotation is null
  		String className = clazz.getName();
  		return IdUtils.toUnderscore(className.substring(className.lastIndexOf(".")+1));
  	}
docs: 从po类获取表名
  @return