• Hibernate

  在實體類與資料庫表建立對映關係時新增 @Table 註解, 當表中不存在實體類中的某個屬性的時候, 就需要用到 @Transient 註解

• 用法: 新增在需要忽略的實體類屬性上

  @Transient
  private String columeName;

• 實體類

@lombok.Data
@Entity
public class UserMonitorStationMapping {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private
 
 Integer id;

    private Integer monitorStationId;

    @Transient
    private String shortName;        // TODO 資料庫表中無此欄位

    @ManyToOne
    @JsonIgnore
    private User user;
}

• 資料庫表結構
  

org.hibernate.exception.SQLGrammarException: could not extract ResultSet
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:82)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter
.java:49)at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:124)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:109)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:88)
at org.hibernate.loader.Loader.getResultSet(Loader.java:2062)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1859)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1838)
at org.hibernate.loader.Loader.doQuery(Loader.java:906)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:348)
at org.hibernate.loader.Loader.doList(Loader.java:2550)
at org.hibernate.loader.Loader.doList(Loader.java:2536)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2366)
at org.hibernate.loader.Loader.list(Loader.java:2361)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:495)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:357)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:198)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1230)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
at com.bbs.dao.BaseDao.list(BaseDao.java:82)
at com.bbs.dao.BaseDao.list(BaseDao.java:92)
at com.bbs.service.impl.OrderServiceImpl.selectOrdersByOne(OrderServiceImpl.java:35)
at com.bbs.service.impl.OrderServiceImpl

• 解決方法
  

在實體類上新增 @Transient 註解