从 maven 执行测试时失败,但从 Intellij 执行时不失败
我正在使用JUnit,PowerMock,Spring Test和内存中的H2数据库编写单元测试。当我从Intellij运行测试时,一切都可以正常运行。但是当我从maven(从Intellij或命令行)运行测试时,它们会失败。
这是我的配置:
@EnableTransactionManagement
@EnableJpaRepositories("my.app.repository")
public class ApplicationTestConfiguration {
@Bean
public SimpleDriverDataSource dataSource() {
SimpleDriverDataSource simpleDriverDataSource = new SimpleDriverDataSource();
simpleDriverDataSource.setDriverClass(org.h2.Driver.class);
simpleDriverDataSource.setUrl("jdbc:h2:mem:./ScenarioService;DATABASE_TO_UPPER=false;DB_CLOSE_DELAY=-1");
simpleDriverDataSource.setUsername("sa");
simpleDriverDataSource.setPassword("sa");
return simpleDriverDataSource;
}
(...)
private Properties hibernateProperties() {
Properties props = new Properties();
props.setProperty("hibernate.dialect","org.hibernate.dialect.H2Dialect");
props.setProperty("hibernate.hbm2ddl.auto", "create-drop");
props.setProperty("hibernate.show_sql","true");
return props;
}
}
这是一个示例测试:
@RunWith(PowerMockRunner.class)
@PowerMockRunnerDelegate(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = {WebAppInitializer.class,ApplicationTestConfiguration.class, DirtiesContextTestExecutionListener.class})
@FixMethodOrder(MethodSorters.NAME_ASCENDING)
@DirtiesContext(classMode = DirtiesContext.ClassMode.AFTER_EACH_TEST_METHOD)
public final class ReadTicketsTest {
@Autowired //this is a spring JPARepository
protected TestRepository testRepository;
@Before
public void init() {
testRepository.save(engineConfig);
}
@Test
public void ticketShouldBeRead() {
//assertion code
}
}
当我从 intelliJ 运行测试并且它们成功时,在休眠日志中,我看到如下所示的内容:
Hibernate: drop table EngineConfigs if exists
Hibernate: create table EngineConfigs (id binary(16) not null, created datetime(6) DEFAULT NULL, customData MEDIUMTEXT, customerId binary(16) not null, signature varchar(255), signatureVersion integer, updated datetime(6) DEFAULT NULL, advancedConfiguration TEXT, engineConfigName varchar(255) not null, engineServiceName varchar(255) not null, locked boolean, probabilityMaximum integer not null, primary key (id))
Hibernate: select engineconf0_.id as id1_1_1_, engineconf0_.created as created2_1_1_, engineconf0_.customData as customDa3_1_1_, engineconf0_.customerId as customer4_1_1_, engineconf0_.signature as signatur5_1_1_, engineconf0_.signatureVersion as signatur6_1_1_, engineconf0_.updated as updated7_1_1_, engineconf0_.advancedConfiguration as advanced8_1_1_, engineconf0_.engineConfigName as engineCo9_1_1_, engineconf0_.engineServiceName as engineS10_1_1_, engineconf0_.locked as locked11_1_1_, engineconf0_.probabilityMaximum as probabi12_1_1_, accumulato1_.EngineConfigs_id as EngineCo1_1_3_, accumulato2_.id as accumula2_2_3_, accumulato2_.id as id1_0_0_, accumulato2_.created as created2_0_0_, accumulato2_.customData as customDa3_0_0_, accumulato2_.customerId as customer4_0_0_, accumulato2_.signature as signatur5_0_0_, accumulato2_.signatureVersion as signatur6_0_0_, accumulato2_.updated as updated7_0_0_, accumulato2_.accumulatorNumber as accumula8_0_0_, accumulato2_.description as descript9_0_0_, accumulato2_.engineConfig_id as engineC12_0_0_, accumulato2_.numberOfHits as numberO10_0_0_, accumulato2_.prize as prize11_0_0_ from EngineConfigs engineconf0_ left outer join EngineConfigs_Accumulators accumulato1_ on engineconf0_.id=accumulato1_.EngineConfigs_id left outer join Accumulators accumulato2_ on accumulato1_.accumulators_id=accumulato2_.id where engineconf0_.id=?
Hibernate: insert into EngineConfigs (created, customData, customerId, signature, signatureVersion, updated, advancedConfiguration, engineConfigName, engineServiceName, locked, probabilityMaximum, id) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
Hibernate: drop table EngineConfigs if exists
这是有道理的,因为预计它将创建数据库,执行测试(因此插入),然后由于@DirtiesContextAnnotation而删除所有表。但是当我从 maven 运行测试时,在休眠日志中,我看到了类似下面的内容:
Hibernate: drop table EngineConfigs if exists
Hibernate: create table EngineConfigs (id binary(16) not null, created datetime(6) DEFAULT NULL, customData MEDIUMTEXT, customerId binary(16) not null, signature varchar(255), signatureVersion integer, updated datetime(6) DEFAULT NULL, advancedConfiguration TEXT, engineConfigName varchar(255) not null, engineServiceName varchar(255) not null, locked boolean, probabilityMaximum integer not null, primary key (id))
Hibernate: select engineconf0_.id as id1_1_1_, engineconf0_.created as created2_1_1_, engineconf0_.customData as customDa3_1_1_, engineconf0_.customerId as customer4_1_1_, engineconf0_.signature as signatur5_1_1_, engineconf0_.signatureVersion as signatur6_1_1_, engineconf0_.updated as updated7_1_1_, engineconf0_.advancedConfiguration as advanced8_1_1_, engineconf0_.engineConfigName as engineCo9_1_1_, engineconf0_.engineServiceName as engineS10_1_1_, engineconf0_.locked as locked11_1_1_, engineconf0_.probabilityMaximum as probabi12_1_1_, accumulato1_.EngineConfigs_id as EngineCo1_1_3_, accumulato2_.id as accumula2_2_3_, accumulato2_.id as id1_0_0_, accumulato2_.created as created2_0_0_, accumulato2_.customData as customDa3_0_0_, accumulato2_.customerId as customer4_0_0_, accumulato2_.signature as signatur5_0_0_, accumulato2_.signatureVersion as signatur6_0_0_, accumulato2_.updated as updated7_0_0_, accumulato2_.accumulatorNumber as accumula8_0_0_, accumulato2_.description as descript9_0_0_, accumulato2_.engineConfig_id as engineC12_0_0_, accumulato2_.numberOfHits as numberO10_0_0_, accumulato2_.prize as prize11_0_0_ from EngineConfigs engineconf0_ left outer join EngineConfigs_Accumulators accumulato1_ on engineconf0_.id=accumulato1_.EngineConfigs_id left outer join Accumulators accumulato2_ on accumulato1_.accumulators_id=accumulato2_.id where engineconf0_.id=?
Hibernate: drop table EngineConfigs if exists
后跟实际错误:
org.springframework.dao.InvalidDataAccessResourceUsageException: could not prepare statement; SQL [select engineconf0_.id as id1_1_1_, engineconf0_.created as created2_1_1_, engineconf0_.customData as customDa3_1_1_, engineconf0_.customerId as customer4_1_1_, engineconf0_.signature as signatur5_1_1_, engineconf0_.signatureVersion as signatur6_1_1_, engineconf0_.updated as updated7_1_1_, engineconf0_.advancedConfiguration as advanced8_1_1_, engineconf0_.engineConfigName as engineCo9_1_1_, engineconf0_.engineServiceName as engineS10_1_1_, engineconf0_.locked as locked11_1_1_, engineconf0_.probabilityMaximum as probabi12_1_1_, accumulato1_.EngineConfigs_id as EngineCo1_1_3_, accumulato2_.id as accumula2_2_3_, accumulato2_.id as id1_0_0_, accumulato2_.created as created2_0_0_, accumulato2_.customData as customDa3_0_0_, accumulato2_.customerId as customer4_0_0_, accumulato2_.signature as signatur5_0_0_, accumulato2_.signatureVersion as signatur6_0_0_, accumulato2_.updated as updated7_0_0_, accumulato2_.accumulatorNumber as accumula8_0_0_, accumulato2_.description as descript9_0_0_, accumulato2_.engineConfig_id as engineC12_0_0_, accumulato2_.numberOfHits as numberO10_0_0_, accumulato2_.prize as prize11_0_0_ from EngineConfigs engineconf0_ left outer join EngineConfigs_Accumulators accumulato1_ on engineconf0_.id=accumulato1_.EngineConfigs_id left outer join Accumulators accumulato2_ on accumulato1_.accumulators_id=accumulato2_.id where engineconf0_.id=?]; nested exception is org.hibernate.exception.SQLGrammarException: could not prepare statement
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:172)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:155)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:417)
at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59)
at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodIntercceptor.invoke(CrudMethodMetadataPostProcessor.java:122)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy64.save(Unknown Source)
at com.twelve40.gameengine.scenario.ScenarioServiceTest.init(ScenarioServiceTest.java:138)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:73)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:73)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:224)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:83)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:68)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:163)
at org.powermock.modules.junit4.internal.impl.DelegatingPowerMockRunner$2.call(DelegatingPowerMockRunner.java:148)
at org.powermock.modules.junit4.internal.impl.DelegatingPowerMockRunner$2.call(DelegatingPowerMockRunner.java:140)
at org.powermock.modules.junit4.internal.impl.DelegatingPowerMockRunner.withContextClassLoader(DelegatingPowerMockRunner.java:131)
at org.powermock.modules.junit4.internal.impl.DelegatingPowerMockRunner.run(DelegatingPowerMockRunner.java:140)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:121)
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59)
at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
Caused by: org.hibernate.exception.SQLGrammarException: could not prepare statement
at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:123)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:196)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:160)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1885)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1862)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1839)
at org.hibernate.loader.Loader.doQuery(Loader.java:910)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:355)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:325)
at org.hibernate.loader.Loader.loadEntity(Loader.java:2149)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:78)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:68)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:4126)
at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:503)
at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:468)
at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:213)
at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:275)
at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:151)
at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1070)
at org.hibernate.internal.SessionImpl.access$2000(SessionImpl.java:176)
at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.load(SessionImpl.java:2551)
at org.hibernate.internal.SessionImpl.get(SessionImpl.java:960)
at org.hibernate.event.internal.DefaultMergeEventListener.entityIsDetached(DefaultMergeEventListener.java:306)
at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:186)
at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:85)
at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:876)
at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:858)
at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:863)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:1196)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:291)
at com.sun.proxy.$Proxy58.merge(Unknown Source)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.save(SimpleJpaRepository.java:434)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:414)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:399)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:371)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
... 50 more
Caused by: org.h2.jdbc.JdbcSQLException: Table "EngineConfigs" not found; SQL statement:
select engineconf0_.id as id1_1_1_, engineconf0_.created as created2_1_1_, engineconf0_.customData as customDa3_1_1_, engineconf0_.customerId as customer4_1_1_, engineconf0_.signature as signatur5_1_1_, engineconf0_.signatureVersion as signatur6_1_1_, engineconf0_.updated as updated7_1_1_, engineconf0_.advancedConfiguration as advanced8_1_1_, engineconf0_.engineConfigName as engineCo9_1_1_, engineconf0_.engineServiceName as engineS10_1_1_, engineconf0_.locked as locked11_1_1_, engineconf0_.probabilityMaximum as probabi12_1_1_, accumulato1_.EngineConfigs_id as EngineCo1_1_3_, accumulato2_.id as accumula2_2_3_, accumulato2_.id as id1_0_0_, accumulato2_.created as created2_0_0_, accumulato2_.customData as customDa3_0_0_, accumulato2_.customerId as customer4_0_0_, accumulato2_.signature as signatur5_0_0_, accumulato2_.signatureVersion as signatur6_0_0_, accumulato2_.updated as updated7_0_0_, accumulato2_.accumulatorNumber as accumula8_0_0_, accumulato2_.description as descript9_0_0_, accumulato2_.engineConfig_id as engineC12_0_0_, accumulato2_.numberOfHits as numberO10_0_0_, accumulato2_.prize as prize11_0_0_ from EngineConfigs engineconf0_ left outer join EngineConfigs_Accumulators accumulato1_ on engineconf0_.id=accumulato1_.EngineConfigs_id left outer join Accumulators accumulato2_ on accumulato1_.accumulators_id=accumulato2_.id where engineconf0_.id=? [42102-193]
at org.h2.message.DbException.getJdbcSQLException(DbException.java:345)
at org.h2.message.DbException.get(DbException.java:179)
at org.h2.message.DbException.get(DbException.java:155)
at org.h2.command.Parser.readTableOrView(Parser.java:5389)
at org.h2.command.Parser.readTableFilter(Parser.java:1257)
at org.h2.command.Parser.parseSelectSimpleFromPart(Parser.java:1897)
at org.h2.command.Parser.parseSelectSimple(Parser.java:2045)
at org.h2.command.Parser.parseSelectSub(Parser.java:1891)
at org.h2.command.Parser.parseSelectUnion(Parser.java:1709)
at org.h2.command.Parser.parseSelect(Parser.java:1697)
at org.h2.command.Parser.parsePrepared(Parser.java:445)
at org.h2.command.Parser.parse(Parser.java:317)
at org.h2.command.Parser.parse(Parser.java:289)
at org.h2.command.Parser.prepareCommand(Parser.java:254)
at org.h2.engine.Session.prepareLocal(Session.java:561)
at org.h2.engine.Session.prepareCommand(Session.java:502)
at org.h2.jdbc.JdbcConnection.prepareCommand(JdbcConnection.java:1203)
at org.h2.jdbc.JdbcPreparedStatement.<init>(JdbcPreparedStatement.java:73)
at org.h2.jdbc.JdbcConnection.prepareStatement(JdbcConnection.java:287)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:162)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:186)
... 99 more
如果我从连接 URL 中删除参数 ;D B_CLOSE_DELAY=-1,并且我从 IntelliJ 运行测试,则会发生此错误。但是使用该参数,测试从IntelliJ开始工作,但不能从maven开始工作!我不知道是什么原因造成的,AFAIK专家不应该影响测试的执行。在执行测试之前,似乎正在关闭与数据库的连接。帮助!