Vue.directive为啥要在实例初始化之前
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篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了Vue.directive为啥要在实例初始化之前相关的知识，希望对你有一定的参考价值。
参考技术A 这个接口用来实现自定义指令，实例初始化代码里面使用的指令一定是在前面已经定义好的指令，如果没有提前定义，后续组件模板中会找不到指令 参考技术B 不在实例初始化之前注册指令那runtime的时候模板中设定的指令如何绑定，绑定到哪里呢？ 参考技术C 适当利用好关键词的匹配方式Postgres 测试容器 - 如果存在级联，为啥要在删除表之前删除约束？
【中文标题】Postgres 测试容器 - 如果存在级联，为啥要在删除表之前删除约束？【英文标题】：Postgres Test Container - Why trying to drop constraint before drop table if exists cascade?Postgres 测试容器 - 如果存在级联，为什么要在删除表之前删除约束？ 【发布时间】：2021-04-29 09:19:00 【问题描述】：我正在使用 Postgres 测试容器。如果 table 有任何约束，例如外键或唯一 hibernate 尝试首先删除此约束，但在出现 realation 不存在的错误之后 - 在此之后，警告“Hibernate: drop table if exists public.USERS cascade”被执行成功创建表并添加了约束。最后约束和表被成功删除。
如何删除这些警告？为什么它首先尝试删除这些约束，或者为什么它不能这样做（尽管该表不存在）？
测试配置：
spring:
example:
url: $DB_URL
username: $DB_USERNAME
password: $DB_PASSWORD
vendor-overrides:
hibernate.hbm2ddl.auto: create-drop
example2:
url: $MYSQL_DB_URL
username: $MYSQL_DB_USERNAME
password: $MYSQL_DB_PASSWORD
jpa:
properties:
hibernate:
default_schema: public
show-sql: true
hibernate:
ddl-auto: create-drop
数据库配置类：
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef = DatabaseMainConfig.REPO_NAME + "EntityManagerFactory",
basePackages = DatabaseMainConfig.REPO_PACKAGE
)
@Primary
public class DatabaseMainConfig
public static final String REPO_NAME = "example";
public static final String REPO_PACKAGE = "com.example.repositories.main";
public static final String DATASOURCE_NAME = REPO_NAME + "Datasource";
@Primary
@Bean(name = REPO_NAME + "DatasourceProperties")
@ConfigurationProperties("spring." + REPO_NAME)
public DataSourceProperties basicDatasourceProperties()
return new DataSourceProperties();
@Primary
@Bean(name = DATASOURCE_NAME)
@ConfigurationProperties("spring." + REPO_NAME + ".configuration")
public HikariDataSource dataSource()
return basicDatasourceProperties()
.initializeDataSourceBuilder()
.type(HikariDataSource.class)
.build();
@Primary
@Bean(name = REPO_NAME + "vendorOverrides")
@ConfigurationProperties(prefix = "spring." + REPO_NAME + ".vendor-overrides")
public Map<String, String> hibernateOverrideConfig()
return new HashMap<>();
@Primary
@Bean(name = REPO_NAME + "EntityManagerFactory")
public LocalContainerEntityManagerFactoryBean entityManagerFactory(
EntityManagerFactoryBuilder entityManagerFactoryBuilder,
@Qualifier(REPO_NAME + "Datasource") DataSource dataSource,
@Qualifier(REPO_NAME + "vendorOverrides") Map<String, String> vendorProperties)
return entityManagerFactoryBuilder
.dataSource(dataSource)
.packages(REPO_PACKAGE, "org.springframework.data.jpa.convert.threeten")
.properties(vendorProperties)
.persistenceUnit(REPO_NAME)
.build();
@Primary
@Bean
public PlatformTransactionManager transactionManager(
@Qualifier(REPO_NAME + "EntityManagerFactory")
EntityManagerFactory entityManagerFactory)
return new JpaTransactionManager(entityManagerFactory);
测试容器：
public class PostgresTestContainer extends PostgreSQLContainer<PostgresTestContainer>
private static final String IMAGE_VERSION = "postgres:11.1";
private static final String DATABASE_NAME = "example";
private static PostgresTestContainer container;
public PostgresTestContainer()
super(IMAGE_VERSION);
public static PostgresTestContainer getInstance()
if (container == null)
container = new PostgresTestContainer().withDatabaseName(DATABASE_NAME);
return container;
@Override
public void start()
super.start();
System.setProperty("DB_URL", container.getJdbcUrl());
System.setProperty("DB_USERNAME", container.getUsername());
System.setProperty("DB_PASSWORD", container.getPassword());
@Override
public void stop()
//do nothing, JVM handles shut down
Hibernate: alter table public.USERS drop constraint FKls73pryys8w3n2h1ximbc390r
2021-01-25 15:33:11.426 WARN 79124 --- [ Test worker] o.h.t.s.i.ExceptionHandlerLoggedImpl : GenerationTarget encountered exception accepting command : Error executing DDL "alter table public.USERS drop constraint FKls73pryys8w3n2h1ximbc390r" via JDBC Statement
org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL "alter table public.USERS drop constraint FKls73pryys8w3n2h1ximbc390r" via JDBC Statement
at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:67) ~[hibernate-core-5.4.17.Final.jar:5.4.17.Final]
at org.hibernate.tool.schema.internal.SchemaDropperImpl.applySqlString(SchemaDropperImpl.java:375) [hibernate-core-5.4.17.Final.jar:5.4.17.Final]
at org.hibernate.tool.schema.internal.SchemaDropperImpl.applySqlStrings(SchemaDropperImpl.java:359) [hibernate-core-5.4.17.Final.jar:5.4.17.Final]
at org.hibernate.tool.schema.internal.SchemaDropperImpl.applyConstraintDropping(SchemaDropperImpl.java:331) [hibernate-core-5.4.17.Final.jar:5.4.17.Final]
at org.hibernate.tool.schema.internal.SchemaDropperImpl.dropFromMetadata(SchemaDropperImpl.java:230) [hibernate-core-5.4.17.Final.jar:5.4.17.Final]
at org.hibernate.tool.schema.internal.SchemaDropperImpl.performDrop(SchemaDropperImpl.java:154) [hibernate-core-5.4.17.Final.jar:5.4.17.Final]
at org.hibernate.tool.schema.internal.SchemaDropperImpl.doDrop(SchemaDropperImpl.java:126) [hibernate-core-5.4.17.Final.jar:5.4.17.Final]
at org.hibernate.tool.schema.internal.SchemaDropperImpl.doDrop(SchemaDropperImpl.java:112) [hibernate-core-5.4.17.Final.jar:5.4.17.Final]
at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:145) [hibernate-core-5.4.17.Final.jar:5.4.17.Final]
at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:73) [hibernate-core-5.4.17.Final.jar:5.4.17.Final]
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:316) [hibernate-core-5.4.17.Final.jar:5.4.17.Final]
at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:469) [hibernate-core-5.4.17.Final.jar:5.4.17.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1259) [hibernate-core-5.4.17.Final.jar:5.4.17.Final]
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:58) [spring-orm-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) [spring-orm-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:391) [spring-orm-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:378) [spring-orm-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) [spring-orm-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1855) [spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1792) [spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595) [spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) [spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) [spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) [spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) [spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1109) ~[spring-context-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869) ~[spring-context-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[spring-context-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) ~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:120) ~[spring-boot-test-2.3.1.RELEASE.jar:2.3.1.RELEASE]
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99) ~[spring-test-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124) ~[spring-test-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:123) ~[spring-test-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:118) ~[spring-test-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83) ~[spring-test-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:244) ~[spring-test-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java:98) ~[spring-test-5.2.7.RELEASE.jar:5.2.7.RELEASE]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$5(ClassBasedTestDescriptor.java:341) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.executeAndMaskThrowable(ClassBasedTestDescriptor.java:346) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeTestInstancePostProcessors$6(ClassBasedTestDescriptor.java:341) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[na:1.8.0_261]
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) ~[na:1.8.0_261]
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1384) ~[na:1.8.0_261]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) ~[na:1.8.0_261]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) ~[na:1.8.0_261]
at java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:312) ~[na:1.8.0_261]
at java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:743) ~[na:1.8.0_261]
at java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:742) ~[na:1.8.0_261]
at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580) ~[na:1.8.0_261]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeTestInstancePostProcessors(ClassBasedTestDescriptor.java:340) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.instantiateAndPostProcessTestInstance(ClassBasedTestDescriptor.java:263) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$2(ClassBasedTestDescriptor.java:256) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at java.util.Optional.orElseGet(Optional.java:267) ~[na:1.8.0_261]
at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$3(ClassBasedTestDescriptor.java:255) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.execution.TestInstancesProvider.getTestInstances(TestInstancesProvider.java:29) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$prepare$0(TestMethodTestDescriptor.java:108) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:107) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:71) ~[junit-jupiter-engine-5.6.2.jar:5.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$prepare$1(NodeTestTask.java:107) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.prepare(NodeTestTask.java:107) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:75) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at java.util.ArrayList.forEach(ArrayList.java:1259) ~[na:1.8.0_261]
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at java.util.ArrayList.forEach(ArrayList.java:1259) ~[na:1.8.0_261]
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51) ~[junit-platform-engine-1.6.2.jar:1.6.2]
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:248) ~[na:na]
at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$5(DefaultLauncher.java:211) ~[na:na]
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:226) ~[na:na]
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:199) ~[na:na]
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:132) ~[na:na]
at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.processAllTestClasses(JUnitPlatformTestClassProcessor.java:99) ~[na:na]
at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.access$000(JUnitPlatformTestClassProcessor.java:79) ~[na:na]
at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor.stop(JUnitPlatformTestClassProcessor.java:75) ~[na:na]
at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.stop(SuiteTestClassProcessor.java:61) ~[na:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_261]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_261]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_261]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_261]
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36) ~[na:na]
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24) ~[na:na]
at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33) ~[na:na]
at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94) ~[na:na]
at com.sun.proxy.$Proxy2.stop(Unknown Source) ~[na:na]
at org.gradle.api.internal.tasks.testing.worker.TestWorker.stop(TestWorker.java:133) ~[na:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_261]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_261]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_261]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_261]
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36) ~[na:na]
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24) ~[na:na]
at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:182) ~[na:na]
at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:164) ~[na:na]
at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:414) ~[na:na]
at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64) ~[na:na]
at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48) ~[na:na]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[na:1.8.0_261]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[na:1.8.0_261]
at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56) ~[na:na]
at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_261]
Caused by: org.postgresql.util.PSQLException: ERROR: relation "public.users" does not exist
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2532) ~[postgresql-42.2.14.jar:42.2.14]
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2267) ~[postgresql-42.2.14.jar:42.2.14]
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:312) ~[postgresql-42.2.14.jar:42.2.14]
at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:448) ~[postgresql-42.2.14.jar:42.2.14]
at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:369) ~[postgresql-42.2.14.jar:42.2.14]
at org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:310) ~[postgresql-42.2.14.jar:42.2.14]
at org.postgresql.jdbc.PgStatement.executeCachedSql(PgStatement.java:296) ~[postgresql-42.2.14.jar:42.2.14]
at org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:273) ~[postgresql-42.2.14.jar:42.2.14]
at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:268) ~[postgresql-42.2.14.jar:42.2.14]
at com.zaxxer.hikari.pool.ProxyStatement.execute(ProxyStatement.java:95) ~[HikariCP-3.4.5.jar:na]
at com.zaxxer.hikari.pool.HikariProxyStatement.execute(HikariProxyStatement.java) ~[HikariCP-3.4.5.jar:na]
at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:54) ~[hibernate-core-5.4.17.Final.jar:5.4.17.Final]
... 124 common frames omitted
...
Hibernate: drop table if exists public.USERS cascade
2021-01-25 15:33:11.435 WARN 79124 --- [ Test worker] o.h.engine.jdbc.spi.SqlExceptionHelper : SQL Warning Code: 0, SQLState: 00000
2021-01-25 15:33:11.435 WARN 79124 --- [ Test worker] o.h.engine.jdbc.spi.SqlExceptionHelper : table "users" does not exist, skipping
...
Hibernate: create table public.USERS (ID uuid not null,...
...
Hibernate: alter table public.USERS add constraint FK7fj7x1mh4r0mwjpcm9p126fh4 foreign key (CONTACT_ADDRESS_ID) references public.ADDRESSES
Hibernate: alter table public.USERS add constraint FKls73pryys8w3n2h1ximbc390r foreign key (ORGANIZATION_ID) references public.ORGANIZATIONS
...
Hibernate: alter table public.USERS drop constraint FK7fj7x1mh4r0mwjpcm9p126fh4
Hibernate: alter table public.USERS drop constraint FKls73pryys8w3n2h1ximbc390r
...
Hibernate: drop table if exists public.USERS cascade
``
【问题讨论】：
您必须配置正确的spring.jpa.database-platform。最有可能org.hibernate.dialect.PostgreSQL95Dialect
【参考方案1】：
Why is it trying to drop these constraints first or why it cannot do this (despite this that table doesn't exists)?
我认为这是因为您配置了以下内容：
hibernate:
ddl-auto: create-drop
据我所知，create 在创建新表之前已经删除了现有表和 FK，因此使用 create-drop 将导致双重删除（第一个在创建表之前，第二个在 spring 上下文关闭之后）。由于第一个 drop 在第二个之前已经发生，所以 FK 不再存在。
【讨论】：
我确实尝试了不同的选项：创建、删除、更新、创建删除和无，情况看起来一样 我投了反对票，因为答案没有帮助。 Beata 是对的，这并没有什么不同。社区不需要“我认为 [...]”的答案，而是需要经过测试的解决方案。以上是关于Vue.directive为啥要在实例初始化之前的主要内容，如果未能解决你的问题，请参考以下文章
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