通过 SpringBoot 项目启动，Hibernate 尝试删除不存在的表

问题描述 投票：0回答：2

我有一个 spring boot 项目，并使用 spring data jpa / hibernate 来管理我的数据层。 该数据库是由 hibernate 基于我的实体创建的。下面是我的设置：

spring.jpa.hibernate.ddl-auto = create-drop
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQL82Dialect
spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true
spring.datasource.initialization-mode=always

一切正常，但在 Spring 启动后，我在日志中收到很多错误。下面是我运行一些集成测试时得到的示例：

 .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.2.1.RELEASE)

2020-02-28 11:00:41.965  INFO 7325 --- [           main] c.b.p12.api.business.MemberManagerIT     : Starting MemberManagerIT on Admins-MBP with PID 7325 (started by admin in /Users/admin/Documents/PROGRAMMING/OPENCLASSROOMS/P12/ZebraInLove/P12-REPO/p12-api/p12-api-business)
2020-02-28 11:00:41.967  INFO 7325 --- [           main] c.b.p12.api.business.MemberManagerIT     : No active profile set, falling back to default profiles: default
2020-02-28 11:00:42.656  INFO 7325 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2020-02-28 11:00:42.747  INFO 7325 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 82ms. Found 7 repository interfaces.
2020-02-28 11:00:43.234  INFO 7325 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-02-28 11:00:43.509  INFO 7325 --- [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [name: default]
2020-02-28 11:00:43.591  INFO 7325 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate Core {5.4.8.Final}
2020-02-28 11:00:43.840  INFO 7325 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.1.0.Final}
2020-02-28 11:00:43.997  INFO 7325 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2020-02-28 11:00:44.129  INFO 7325 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
2020-02-28 11:00:44.155  INFO 7325 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.PostgreSQL82Dialect
Hibernate: alter table declared_location drop constraint FKdwbc02mn6m4s7bp0tdcc4i29n
2020-02-28 11:00:45.118  WARN 7325 --- [           main] o.h.t.s.i.ExceptionHandlerLoggedImpl     : GenerationTarget encountered exception accepting command : Error executing DDL "alter table declared_location drop constraint FKdwbc02mn6m4s7bp0tdcc4i29n" via JDBC Statement

org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL "alter table declared_location drop constraint FKdwbc02mn6m4s7bp0tdcc4i29n" via JDBC Statement
    at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:67) ~[hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.tool.schema.internal.SchemaDropperImpl.applySqlString(SchemaDropperImpl.java:375) [hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.tool.schema.internal.SchemaDropperImpl.applySqlStrings(SchemaDropperImpl.java:359) [hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.tool.schema.internal.SchemaDropperImpl.applyConstraintDropping(SchemaDropperImpl.java:331) [hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.tool.schema.internal.SchemaDropperImpl.dropFromMetadata(SchemaDropperImpl.java:230) [hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.tool.schema.internal.SchemaDropperImpl.performDrop(SchemaDropperImpl.java:154) [hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.tool.schema.internal.SchemaDropperImpl.doDrop(SchemaDropperImpl.java:126) [hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.tool.schema.internal.SchemaDropperImpl.doDrop(SchemaDropperImpl.java:112) [hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:145) [hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:73) [hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:320) [hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:462) [hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1249) [hibernate-core-5.4.8.Final.jar:5.4.8.Final]
(...)

Caused by: org.postgresql.util.PSQLException: ERROR: relation "declared_location" does not exist

看起来，问题在于 Hibernate 在启动时就尝试删除尚未创建的表上的约束。这当然会产生错误。

进一步在日志中显示：

  • Hibernate 将尝试删除该表
Hibernate: drop table if exists declared_location cascade
2020-02-28 11:00:45.141  WARN 7325 --- [           main] o.h.engine.jdbc.spi.SqlExceptionHelper   : SQL Warning Code: 0, SQLState: 00000
2020-02-28 11:00:45.141  WARN 7325 --- [           main] o.h.engine.jdbc.spi.SqlExceptionHelper   : table "declared_location" does not exist, skipping

然后创建它：

Hibernate: create table declared_location (id varchar(255) not null, address varchar(255), latitude float8 not null, longitude float8 not null, member_id varchar(255), primary key (id))

然后修改它

Hibernate: alter table declared_location add constraint FKdwbc02mn6m4s7bp0tdcc4i29n foreign key (member_id) references member

最后，我的测试通过了，但我只是对这些充满伪错误的很长的日志感到恼火。我可以做什么来避免这种情况？

hibernate spring-boot ddl
2个回答
0
投票

我认为 spring.jpa.hibernate.ddl-auto = create-drop 正在执行 drop-create-drop 。如果您使用模拟数据，则可以确保数据库干净，但代价是在创建之前尝试删除。

spring.jpa.hibernate.ddl-auto属性在Spring中到底是如何工作的？

0
投票

我也有类似的问题。对我来说，这是通过放置解决的 spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect 进入我的configuration.properties 文件。 我认为错误仍然发生在引擎盖下的某个地方，但至少 Hibernate 不再记录它。

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