Question

我有一个映射到数据库视图的实体，例如

@Entity
@Immutable
@Table(name = "my_view")
public class MyView {
 // some properties and getters
}

我的SQL吊坠就像create view my_view as select * from thisAndThat and stupid logic;

在我的生产环境中，它就像一个烟囱。现在，在集成测试中，我使用Hibernate属性hibernate.hbm2ddl.auto = update在HSQL中即时使用DbUnit创建数据库设置。因为我没有将实体表直接标记为视图，所以hibernate尝试创建数据库。

我可以使用flyway修复此问题并添加迁移脚本

drop table if exists my_view;
create view my_view AS ....;

首先：有效

但是：在构建项目时，我会遇到很多异常

2019-11-29 14:03:43,023  WARN  ExceptionHandlerLoggedImpl:handleException:27 GenerationTarget encountered exception accepting command : Error executing DDL "alter table my_view add constraint FKj50dxtl46l99jfi90uf4df7vo foreign key (other_table_id) references fonds" via JDBC Statement
org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL "alter table my_view add constraint FKj50dxtl46l99jfi90uf4df7vo foreign key (other_table_id) references other_table" via JDBC Statement
    at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:67)
    at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.applySqlString(AbstractSchemaMigrator.java:559)
    at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.applySqlStrings(AbstractSchemaMigrator.java:504)
    at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.applyForeignKeys(AbstractSchemaMigrator.java:433)
    at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.performMigration(AbstractSchemaMigrator.java:249)
    at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.doMigration(AbstractSchemaMigrator.java:114)
    at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:184)
    at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:73)
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:315)
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:462)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:708)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:724)
    at org.springframework.orm.hibernate5.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:615)
....

这是a）有点令人不安和b）让我感到紧张，这可能会在（不久的将来）发生。

您知道如何跳过使用hibernate.hbm2ddl.auto创建的特定表吗？

谢谢！

Answer 1

在这种情况下，我将使用@Subselect而不是@Table（https://docs.jboss.org/hibernate/orm/5.2/javadocs/org/hibernate/annotations/Subselect.html）

关于文档@Subselect

将不可变且只读的实体映射到给定的SQL选择表达。

休眠hbm2ddl.auto创建/更新跳过视图

1 个答案: