2

模型类：

@Entity
@Table(name = "CSU_AUDIT")
@NamedQuery(name = "findAllEventsForObjectId", query = "from AuditEvent e where e.objectId = :objectId order by e.auditTimestamp desc")
public class AuditEvent implements Serializable {
    /**
     * 
     */
    private static final long serialVersionUID = 577051869176721340L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int auditId;

    @Column(name = "INSERT_TS")
    private Date auditTimestamp;

    @Column(name = "OBJECT_ID")
    private String objectId;

    @Column(name = "ACTION_CODE")
    private String actionCode;

    @Column(name = "USER_ID")
    private String userId;

    @Column(name = "FIELD_NAME")
    private String fieldName;

    @Column(name = "OLD_VALUE")
    private String oldValue;

    @Column(name = "NEW_VALUE")
    private String newValue;

简单的 DAO 方法：

public void insertEvent(AuditEvent event) {
        final Session session = sessionFactory.getCurrentSession();
        session.beginTransaction();
        log.info("Saving audit event...");
        log.debug(event);
        session.save(event);
        session.getTransaction().commit();
    }

会话工厂由 Spring 的AnnotationSessionFactoryBean.

相关异常信息（如有必要，可提供更多信息）：

2012-07-12 09:01:41,049 DEBUG org.hibernate.event.def.AbstractSaveEventListener - executing identity-insert immediately
2012-07-12 09:01:41,053 DEBUG org.hibernate.jdbc.AbstractBatcher - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
2012-07-12 09:01:41,066 DEBUG org.hibernate.SQL - insert into CSU_AUDIT (auditId, ACTION_CODE, INSERT_TS, FIELD_NAME, NEW_VALUE, OBJECT_ID, OLD_VALUE, USER_ID) values (default, ?, ?, ?, ?, ?, ?, ?)
2012-07-12 09:01:41,100 DEBUG org.hibernate.jdbc.AbstractBatcher - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
2012-07-12 09:01:41,117 DEBUG org.hibernate.util.JDBCExceptionReporter - could not insert: [com.cinfin.ecm.csudocmgr.audit.AuditEvent] [insert into CSU_AUDIT (auditId, ACTION_CODE, INSERT_TS, FIELD_NAME, NEW_VALUE, OBJECT_ID, OLD_VALUE, USER_ID) values (default, ?, ?, ?, ?, ?, ?, ?)]
com.ibm.db2.jcc.c.SqlException: DB2 SQL error: SQLCODE: -206, SQLSTATE: 42703, SQLERRMC: AUDITID

我不明白为什么该字段注释为@ID并@GeneratedValue(strategy = GenerationType.IDENTITY)包含在插入中。我读过的所有内容都表明hibernate应该完全省略这个字段。在数据库方面，该字段将作为身份生成，尽管我没有生成代码来确定它是如何声明的。

4

1 回答 1

2

正如您在日志中看到的，它default作为生成列的值传递，这意味着：使用该列的默认值。DB2 的文档说：

默认

指定使用默认值。指定 DEFAULT 的结果取决于列的定义方式，如下所示：

[...]

  • 如果使用 IDENTITY 子句，则该值由数据库管理器生成。
于 2012-07-12T14:02:39.327 回答