Java 由于外键损坏,Hibernate无法重建表
好的,我有一个使用Hibernate(5.0.12.Final)的Spring启动应用程序(1.5.2.RELEASE),我遇到了一些问题,Hibernate无法在启动时正确地重新创建数据库 我将Hibernate配置为在启动时再次创建表:Java 由于外键损坏,Hibernate无法重建表,java,mysql,spring,hibernate,jpa,Java,Mysql,Spring,Hibernate,Jpa,好的,我有一个使用Hibernate(5.0.12.Final)的Spring启动应用程序(1.5.2.RELEASE),我遇到了一些问题,Hibernate无法在启动时正确地重新创建数据库 我将Hibernate配置为在启动时再次创建表: spring.jpa.hibernate.ddl-auto=create 这是我的第一个实体(客户): 以下是所创建数据库的概述: 这是控制台输出,为了简单起见,我尝试将其缩写为: INFO : HCANN000001: Hibernate Common
spring.jpa.hibernate.ddl-auto=create
这是我的第一个实体(客户):
以下是所创建数据库的概述:
这是控制台输出,为了简单起见,我尝试将其缩写为:
INFO : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
INFO : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
INFO : HHH000227: Running hbm2ddl schema export
Hibernate: alter table reservation drop foreign key FKoewar6f18rkn4iptr6da4oysv
ERROR : HHH000389: Unsuccessful: alter table reservation drop foreign key FKoewar6f18rkn4iptr6da4oysv
ERROR : Can't DROP 'FKoewar6f18rkn4iptr6da4oysv'; check that column/key exists
Hibernate: drop table if exists client
ERROR : HHH000389: Unsuccessful: drop table if exists client
ERROR : Cannot delete or update a parent row: a foreign key constraint fails
Hibernate: drop table if exists reservation
Hibernate: drop table if exists restaurant
Hibernate: create table client (id bigint not null auto_increment, created_on datetime, credentials_version integer not null, hash varchar(255), username varchar(255), email varchar(255) not null, first_name varchar(255) not null, name varchar(255) not null, primary key (id))
ERROR : HHH000389: Unsuccessful: create table client (id bigint not null auto_increment, created_on datetime, credentials_version integer not null, hash varchar(255), username varchar(255), email varchar(255) not null, first_name varchar(255) not null, name varchar(255) not null, primary key (id))
ERROR : Table 'client' already exists
Hibernate: create table reservation (id bigint not null auto_increment, state varchar(255), client_id bigint, primary key (id))
Hibernate: create table restaurant (id bigint not null auto_increment, primary key (id))
Hibernate: alter table reservation add constraint FKoewar6f18rkn4iptr6da4oysv foreign key (client_id) references client (id)
INFO : HHH000230: Schema export complete
INFO : Initialized JPA EntityManagerFactory for persistence unit 'default'
INFO : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
INFO : HHH000227: Running hbm2ddl schema export
ERROR : HHH000389: Unsuccessful: alter table `Reservation` drop foreign key `FK8gjvlt7rp8i9kp7rdmn107ni7`
ERROR : Can't DROP 'FK8gjvlt7rp8i9kp7rdmn107ni7'; check that column/key exists
ERROR : HHH000389: Unsuccessful: drop table if exists `Client`
ERROR : Cannot delete or update a parent row: a foreign key constraint fails
ERROR : HHH000389: Unsuccessful: create table `Client` (`id` bigint not null auto_increment, `createdOn` datetime, `credentialsVersion` integer not null, `hash` varchar(255), `username` varchar(255), `email` varchar(255) not null, `firstName` varchar(255) not null, `name` varchar(255) not null, primary key (`id`))
ERROR : Table 'client' already exists
INFO : HHH000230: Schema export complete
我不知道这是否重要,但MySQL数据库版本是在Windows上运行的5.7.13。此外,我没有包括餐厅实体和凭证
我觉得很奇怪,Hibernate试图先删除一个不存在的外键,然后删除正确的外键,但都失败了(如果我读对了的话)
这背后的原因是什么?如何预防这些问题
我看过其他相关的SO问题,它们通常是由无效的名称或类似的名称引起的,但我没有发现我的命名有任何问题。我也尝试过在我所有的表前面加上“tbl_”前缀,并用前缀重命名一些列,以防发生冲突,但运气不好
这让我很烦恼,因为数据库没有正确更新,在活动开发期间,我不想每次都手动删除/创建模式。也许值得一提的是,即使模式为空,在启动时,hibernate也会给出一些不存在的错误。试试看。我认为这是一个保留问题
@ManyToOne
@JoinColumn(name = "client_id")
private Client client;
首先,您应该了解外键约束名称是如何生成的: 因此,如果更改表或外键列名,则会有不同的外键约束名称,并且Hibernate将无法删除旧的外键约束 您可以做什么:
@javax.persistence.ForeignKey
注释(不要将其与
@org.hibernate.annotations.ForeignKey
,尽管可以使用
至)spring.jpa.hibernate.ddl-auto=update
只更新模式,
不是每次都要重现它您好,我相信client_id已经是默认的名称了。谢谢您的回答,但是即使我在几代人和初创公司之间没有更改任何内容,它仍然无法删除外键。
INFO : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
INFO : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
INFO : HHH000227: Running hbm2ddl schema export
Hibernate: alter table reservation drop foreign key FKoewar6f18rkn4iptr6da4oysv
ERROR : HHH000389: Unsuccessful: alter table reservation drop foreign key FKoewar6f18rkn4iptr6da4oysv
ERROR : Can't DROP 'FKoewar6f18rkn4iptr6da4oysv'; check that column/key exists
Hibernate: drop table if exists client
ERROR : HHH000389: Unsuccessful: drop table if exists client
ERROR : Cannot delete or update a parent row: a foreign key constraint fails
Hibernate: drop table if exists reservation
Hibernate: drop table if exists restaurant
Hibernate: create table client (id bigint not null auto_increment, created_on datetime, credentials_version integer not null, hash varchar(255), username varchar(255), email varchar(255) not null, first_name varchar(255) not null, name varchar(255) not null, primary key (id))
ERROR : HHH000389: Unsuccessful: create table client (id bigint not null auto_increment, created_on datetime, credentials_version integer not null, hash varchar(255), username varchar(255), email varchar(255) not null, first_name varchar(255) not null, name varchar(255) not null, primary key (id))
ERROR : Table 'client' already exists
Hibernate: create table reservation (id bigint not null auto_increment, state varchar(255), client_id bigint, primary key (id))
Hibernate: create table restaurant (id bigint not null auto_increment, primary key (id))
Hibernate: alter table reservation add constraint FKoewar6f18rkn4iptr6da4oysv foreign key (client_id) references client (id)
INFO : HHH000230: Schema export complete
INFO : Initialized JPA EntityManagerFactory for persistence unit 'default'
INFO : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
INFO : HHH000227: Running hbm2ddl schema export
ERROR : HHH000389: Unsuccessful: alter table `Reservation` drop foreign key `FK8gjvlt7rp8i9kp7rdmn107ni7`
ERROR : Can't DROP 'FK8gjvlt7rp8i9kp7rdmn107ni7'; check that column/key exists
ERROR : HHH000389: Unsuccessful: drop table if exists `Client`
ERROR : Cannot delete or update a parent row: a foreign key constraint fails
ERROR : HHH000389: Unsuccessful: create table `Client` (`id` bigint not null auto_increment, `createdOn` datetime, `credentialsVersion` integer not null, `hash` varchar(255), `username` varchar(255), `email` varchar(255) not null, `firstName` varchar(255) not null, `name` varchar(255) not null, primary key (`id`))
ERROR : Table 'client' already exists
INFO : HHH000230: Schema export complete
@ManyToOne
@JoinColumn(name = "client_id")
private Client client;