public static Field getSoftDeleteColumn(Class<?> clazz) {
		List<Field> fields = getColumns(clazz);
		
		for(Field field : fields) {
			Column column = field.getAnnotation(Column.class);
			if(column.softDelete() != null && column.softDelete().length == 2
					&& !column.softDelete()[0].trim().isEmpty()
					&& !column.softDelete()[1].trim().isEmpty()) {
				return field;
			}
		}
		return null;
	}
public static Field getSoftDeleteColumn ( Class < ? > clazz ) { List < Field > fields = getColumns ( clazz ) ; for ( Field field : fields ) { Column column = field . getAnnotation ( Column . class ) ; if ( column . softDelete ( ) != null && column . softDelete ( ) . length == 2 && ! column . softDelete ( ) [ 0 ] . trim ( ) . isEmpty ( ) && ! column . softDelete ( ) [ 1 ] . trim ( ) . isEmpty ( ) ) { return field ; } } return null ; }
获得软删除标记字段，最多只能返回1个。
@param clazz
@return 如果没有则返回null