休眠列表

Question

當我試圖獲得對象的列表我得到以下異常：

Hibernate: select this_.newsId as newsId2_0_, this_.newsBrief as newsBrief2_0_, this_.newsContent as newsCont3_2_0_, this_.newsDate as newsDate2_0_, this_.newsTitle as newsTitle2_0_, this_.selected as selected2_0_ from NEWS this_ 
    Nov 15, 2013 11:04:58 AM org.apache.catalina.core.StandardWrapperValve invoke 
    SEVERE: Servlet.service() for servlet [action] in context with path [/strts-spring-hbnt-nomaven] threw exception [org.hibernate.exception.SQLGrammarException: could not execute query] with root cause 
    java.sql.SQLSyntaxErrorException: ORA-00904: "THIS_"."SELECTED": invalid identifier 

DDL

-------------------------------------------------------- 
-- DDL for Table NEWS 
-------------------------------------------------------- 

    CREATE TABLE "SYSTEM"."NEWS" 
    ( "NEWSID" NUMBER, 
    "NEWSTITLE" VARCHAR2(100 BYTE), 
    "NEWSBRIEF" VARCHAR2(500 BYTE), 
    "NEWSCONTENT" VARCHAR2(2048 BYTE), 
    "NEWSDATE" DATE 
    ) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING 
    STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 
    PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) 
    TABLESPACE "SYSTEM" ; 

-------------------------------------------------------- 
-- DDL for Index NEWS_PK 
-------------------------------------------------------- 

    CREATE UNIQUE INDEX "SYSTEM"."NEWS_PK" ON "SYSTEM"."NEWS" ("NEWSID") 
    PCTFREE 10 INITRANS 2 MAXTRANS 255 
    STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 
    PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) 
    TABLESPACE "SYSTEM" ; 
-------------------------------------------------------- 
-- Constraints for Table NEWS 
-------------------------------------------------------- 

    ALTER TABLE "SYSTEM"."NEWS" ADD CONSTRAINT "NEWS_PK" PRIMARY KEY ("NEWSID") 
    USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 
    STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 
    PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) 
    TABLESPACE "SYSTEM" ENABLE; 
    ALTER TABLE "SYSTEM"."NEWS" MODIFY ("NEWSDATE" NOT NULL ENABLE); 
    ALTER TABLE "SYSTEM"."NEWS" MODIFY ("NEWSCONTENT" NOT NULL ENABLE); 
    ALTER TABLE "SYSTEM"."NEWS" MODIFY ("NEWSBRIEF" NOT NULL ENABLE); 
    ALTER TABLE "SYSTEM"."NEWS" MODIFY ("NEWSTITLE" NOT NULL ENABLE); 
    ALTER TABLE "SYSTEM"."NEWS" MODIFY ("NEWSID" NOT NULL ENABLE); 

新聞類：

@Entity 
@Table(name="NEWS") 
public class News { 

    private boolean selected=false; 
    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO, generator = "news_seq_gen") 
    @SequenceGenerator(name = "news_seq_gen", sequenceName = "news_seq") 
    private int newsId; 

    @Column(name="newsTitle", nullable = false, length = 100) 
    private String newsTitle; 
    @Column(name="newsDate", nullable = false) 
    private Date newsDate; 
    @Column(name="newsBrief", nullable = false, length = 500) 
    private String newsBrief; 
    @Column(name="newsContent", nullable = false, length = 2048) 
    private String newsContent; 
     //getters and setters 
} 

查詢：

return sessionFactory.getCurrentSession().createQuery("from News as News").list(); 

爲什麼hibernate將數字添加到列名稱中？問題在哪裏？ 任何建議將升值。

Answer 1

您正在使用字段訪問模式，將@Id放置在類屬性上。這會導致hibernate將所有字段視爲表列。據我瞭解你的DDL，News.selected是一個短暫的財產。

嘗試將@Transient註釋放在selected上。