docs: public String deleteByIds(MappedStatement ms) {
          final Class<?> entityClass = getEntityClass(ms);
          StringBuilder sql = new StringBuilder();
          sql.append(SqlHelper.deleteFromTable(entityClass, tableName(entityClass)));
          Set<EntityColumn> columnList = EntityHelper.getPKColumns(entityClass);
          if (columnList.size() == 1) {
              EntityColumn column = columnList.iterator().next();
              sql.append(" where ");
              sql.append(column.getColumn());
              sql.append(" in (${_parameter})");
          } else {
              throw new MapperException("继承 deleteByIds 方法的实体类[" + entityClass.getCanonicalName() + "]中必须只有一个带有 @Id 注解的字段");
          }
          return sql.toString();
      }