我有一个表,它使用两列来表示它的主键,一个事务 id,然后是序列号。
我尝试了第 2.2.3.2.2 节中推荐的http://docs.jboss.org/hibernate/stable/annotations/reference/en/html_single/#entity-mapping,但是当我使用 Hibernate 会话提交此实体时对象,它在插入语句中省略了 TXN_ID 字段,只包括 BA_SEQ 字段!
怎么了?这是相关的代码摘录:
@Id
@Column(name="TXN_ID")
private long txn_id; public long getTxnId(){return txn_id;} public void setTxnId(long t){this.txn_id=t;}
@Id
@Column(name="BA_SEQ")
private int seq; public int getSeq(){return seq;} public void setSeq(int s){this.seq=s;}
这里有一些日志语句来显示失败的具体情况:
In createKeepTxnId of DAO base class: about to commit Transaction :: txn_id->90625
seq->0 ...<Snip>...
Hibernate: insert into TBL (BA_ACCT_TXN_ID, BA_AUTH_SRVC_TXN_ID, BILL_SRVC_ID,
BA_BILL_SRVC_TXN_ID, BA_CAUSE_TXN_ID, BA_CHANNEL, CUSTOMER_ID, BA_MERCHANT_FREETEXT,
MERCHANT_ID, MERCHANT_PARENT_ID, MERCHANT_ROOT_ID, BA_MERCHANT_TXN_ID, BA_PRICE,
BA_PRICE_CRNCY, BA_PROP_REQS, BA_PROP_VALS, BA_REFERENCE, RESERVED_1, RESERVED_2,
RESERVED_3, SRVC_PROD_ID, BA_STATUS, BA_TAX_NAME, BA_TAX_RATE, BA_TIMESTAMP, BA_SEQ)
values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
[WARN] util.JDBCExceptionReporter SQL Error: 1400, SQLState: 23000
[ERROR] util.JDBCExceptionReporter ORA-01400: cannot insert NULL into
("SCHEMA"."TBL"."TXN_ID")
需要注意的重要一点是我打印出设置了 txn_id 的实体对象,然后下面的 insert into 语句在列表中不包括 TXN_ID,因此 NOT NULL 表约束拒绝查询。