小编The*_*hin的帖子

我的任务是使用BoneCP和jOOQ以及Spring建立一个项目,但是我遇到了一些困难.在我的MySQL数据库中单独插入可以很好地工作,但使用190,000个对象需要大约20分钟,所以为了加快速度,我想一次使用100个批量插入.但是,这会引发以下异常:

org.springframework.transaction.TransactionSystemException: Could not roll back JDBC transaction; nested exception is java.sql.SQLException: Connection is closed!
   at org.springframework.jdbc.datasource.DataSourceTransactionManager.doRollback(DataSourceTransactionManager.java:288)
   at org.springframework.transaction.support.AbstractPlatformTransactionManager.processRollback(AbstractPlatformTransactionManager.java:849)
   at org.springframework.transaction.support.AbstractPlatformTransactionManager.rollback(AbstractPlatformTransactionManager.java:826)
   at org.springframework.transaction.interceptor.TransactionAspectSupport.completeTransactionAfterThrowing(TransactionAspectSupport.java:496)
   at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:266)
   at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
   at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:644)
   at com.theshahin.service.YmsLinkDataService$$EnhancerBySpringCGLIB$$b9b6e447.create(<generated>)
   at com.theshahin.integration.YmsLinkDataServiceTest.foo(YmsLinkDataServiceTest.java:76)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:606)
   at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
   at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
   at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
   at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
   at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
   at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
   at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
   at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
   at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:232)
   at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:89)
   at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
   at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
   at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
   at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
   at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
   at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
   at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
   at org.junit.runners.ParentRunner.run(ParentRunner.java:309) …

我正在尝试从 MySQL 表中选择随机记录列表，但优先考虑某些 ENUM 类型。当我在终端中运行以下纯 SQL 查询时，它工作正常：

select * from table_name where expires <= UNIX_TIMESTAMP()*1000 
order by enum_type desc, rand() limit 500;

但在编写以下代码时，我的 IDE 出现编译错误：

private List<FooRecord> getNextRecordsWeighted(Condition condition, int recordLimit) {
    final long timeNow = System.currentTimeMillis();
    return context.selectFrom(TABLE_NAME).where(TABLE_NAME.EXPIRES.lessOrEqual(timeNow)).
        orderBy(TABLE_NAME.ENUM_TYPE.desc(), DSL.rand()).limit(recordLimit).fetch();
}

现在，我的 IDE 所说的是，显然没有可以调用的兼容方法来执行此操作。我该如何解决这个问题呢？有解决方法吗？