我正在尝试使用可能包含Spring Data JPA注释的文章来设置一个简单的数据库。但是,一旦我在文章Hibernate上启用了注释关系,便抛出异常:
o.h.t.s.i.ExceptionHandlerLoggedImpl : GenerationTarget encountered exception accepting command : Error executing DDL via JDBC Statement
org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL via JDBC Statement at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:67) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
[...]
Caused by: java.sql.SQLSyntaxErrorException: user lacks privilege or object not found: PUBLIC.ARTICLE_COMMENTS
at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source) ~[hsqldb-2.4.1.jar:2.4.1]
at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source) ~[hsqldb-2.4.1.jar:2.4.1]
at org.hsqldb.jdbc.JDBCStatement.fetchResult(Unknown Source) ~[hsqldb-2.4.1.jar:2.4.1]
at org.hsqldb.jdbc.JDBCStatement.execute(Unknown Source) ~[hsqldb-2.4.1.jar:2.4.1]
at com.zaxxer.hikari.pool.ProxyStatement.execute(ProxyStatement.java:95) ~[HikariCP-2.7.9.jar:na]
at com.zaxxer.hikari.pool.HikariProxyStatement.execute(HikariProxyStatement.java) ~[HikariCP-2.7.9.jar:na]
at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:54) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
... 157 common frames omitted
我的文章类如下:
@Entity
public class Article {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
private String name;
private String abstractText;
private String author;
private Date createdAt;
private int visibility;
private int likes;
private int views;
private int commentCount;
@OneToMany(cascade=CascadeType.ALL)
private List<Comment> comments;
// getters and setters omitted
}
评论:
@Entity
public class Comment {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
private String commentText;
private Date createdAt;
}
pom包含对HSQLDB,PostgreSQL,Spring Boot Starter Data JPA和Spring Boot Starter Web的依赖关系:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
当我删除与注释列表的关系时,它将起作用。有什么建议吗?
答案 0 :(得分:3)
似乎是spring.jpa.hibernate.ddl-auto
属性所致。对于内存数据库,Spring默认将其设置为create-drop
。但是,在当前的Spring Boot或HSQLDB或Hibernate版本(或者可能是组合?)中,这似乎会引起问题。将值更改为update
后,它就可以正常工作。
答案 1 :(得分:0)
您看到的异常只是一个警告,它实际上并不意味着有任何损坏。如果使用show-sql: true
选项,您将看到此警告实际上是由alter table comment DROP CONSTRAINT XXXXX
引起的,ddl-auto: update
是Hibernate创建DDL的一部分,并且执行此查询时hsqldb没有任何表。
更改为import.sql
有其副作用。 application.yaml
不适用于此选项。
为避免此警告,您可以将以下几行添加到logging:
level:
org.hibernate.tool.schema.internal.ExceptionHandlerLoggedImpl: ERROR
:
<h1>This is a long headline</h1>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.</p>
<blockquote>This is a nice quote</blockquote>
答案 2 :(得分:0)
对我来说,问题在于我提供的依赖项。
我有一列 @Column(nullable = false, columnDefinition = "text")
并且旧的依赖项不支持此列定义。这就是我必须改变的原因
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<scope>test</scope>
</dependency>
到这里
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>test</scope>
</dependency>