Question

我有以下设置。

类，比方说，有CarPart的汽车（belongsTo = [car：Car]）。

当我创建汽车时，我也想创建som默认的CarParts，所以我做

def car = new Car(bla bla bla)
def part = new CarPart(car:car)

现在，当我执行car.validate（）或part.validate（）时，它看起来很好。但是当我这样做时（car.save＆amp;＆amp; part.save（）我得到了这个例外：

    2012-03-24 14:02:21,943 [http-8080-4] ERROR util.JDBCExceptionReporter  - Batch entry 0 insert into car_part (version, car_id, id) values ('0', '297', '298') was aborted.  Call getNextException to see the cause.
2012-03-24 14:02:21,943 [http-8080-4] ERROR util.JDBCExceptionReporter  - ERROR: value too long for type character varying(6)
2012-03-24 14:02:21,943 [http-8080-4] ERROR events.PatchedDefaultFlushEventListener  - Could not synchronize database state with session
org.hibernate.exception.DataException: Could not execute JDBC batch update

Stacktrace follows:
java.sql.BatchUpdateException: Batch entry 0 insert into car_part (version, deal_id, id) values ('0', '297', '298') was aborted.  Call getNextException to see the cause.
    at org.postgresql.jdbc2.AbstractJdbc2Statement$BatchResultHandler.handleError(AbstractJdbc2Statement.java:2621)
    at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1837)
    at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:407)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeBatch(AbstractJdbc2Statement.java:2754)
    at $Proxy20.flush(Unknown Source)
    at ristretto.DealController$_closure5.doCall(DealController.groovy:109)
    at ristretto.DealController$_closure5.doCall(DealController.groovy)
    at java.lang.Thread.run(Thread.java:722)

有什么想法吗？

Answer 1

调用validate实际上只是检查约束。保存失败的是数据库的实际持久性（验证无法真正检查）。

通常，在Grails中，您可能希望通过以下两种方式之一执行此操作：

def car = new Car(bla bla)
car.save()
def carPart = new CarPart(car:car)
carPart.save()

或

def car = new Car(bla bla)
def carPart = new CarPart(bla bla)
car.addToCarParts(carPart)
car.save()

域验证但不会保存

1 个答案: