Statement returned more than one row, where no more than one was expected

简单翻译下这个报错：返回值(对象)数目超过了一个，预期值不应该超过一个

也就是说mybatis连表查询中如果用了associate，如

那么该类对象(projectPO)和它的对象属性(typePO)应该是一对多的关系，typePO属性应该被封装为List

@Data
@NoArgsConstructor
@AllArgsConstructor
public class ProjectPO {private List<TypePO> typePO;//....................
}

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