当我对表格做任何事情时,它总是显示错误:
Hibernate: select nextval ('hibernate_sequence')
2019-07-20 16:15:44.877 WARN 58376 --- [nio-9000-exec-1] o.h.engine.jdbc.spi.SqlExceptionHelper : SQL Error: 0, SQLState: 42P01
2019-07-20 16:15:44.877 ERROR 58376 --- [nio-9000-exec-1] o.h.engine.jdbc.spi.SqlExceptionHelper : ERROR: relation "hibernate_sequence" does not exist
我不想使用 hibernate_sequence 在表之间共享 id sequence,而是想为每个表定义 id seq 并分别使用它们。
我使用Spring Boot 2.1.6.RELEASE、Spring Data JPA(Hibernate 5.3.10.Final)、Postgres 11.2,定义id字段为BigSerial类型,希望在各自实体中使用各表的id序列类。
演示仓库在这里:https://github.com/Redogame/share_hibernate_sequence
创建用户表(使用 identity 作为表名,因为 user 是 Postgres 保留关键字)。 通过定义bigserial类型的id,Postgres会自动创建一个identity_id_seq,我验证identity_id_seq已经创建成功。
create table identity
(
id bigserial not null
constraint identity_pkey
primary key,
name varchar(255) not null
constraint identity_name_key
unique
constraint identity_name_check
check ((name)::text <> ''::text),
created_date timestamp not null,
created_by_id bigint not null
constraint identity_identity_id_fk
references identity,
last_modified_date timestamp not null,
last_modified_by_id bigint not null
constraint identity_identity_id_fk_2
references identity,
version bigint not null
);
指定一个序列生成器来使用这个id序列:
@Table(name = "identity")
public class UserEntity extends Auditable<Long> {
@Id
@SequenceGenerator(name="identity_id_seq", sequenceName = "identity_id_seq", initialValue=1, allocationSize=1)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="identity_id_seq")
private Long id;
但它不起作用。我还尝试配置 spring.jpa.hibernate.use-new-id-generator-mappings
和 spring.jpa.properties.hibernate.id.new_generator_mappings
,但还是不行工作。
spring:
jpa:
hibernate:
use-new-id-generator-mappings: false
properties:
hibernate:
id:
new_generator_mappings: false
我希望不使用 hibernate_sequence,即:不要在任何 SQL 语句之前/之后执行 select nextval ('hibernate_sequence')。
最佳答案
尝试以下步骤
如果不存在则创建序列 manual_seq;
修改建表脚本
create table identity
(
id integer NOT NULL DEFAULT nextval('manual_seq'::regclass),
name varchar(255) not null
constraint identity_name_key
unique
constraint identity_name_check
check ((name)::text <> ''::text),
created_date timestamp not null,
created_by_id bigint not null,
last_modified_date timestamp not null,
last_modified_by_id bigint not null,
version bigint not null,
CONSTRAINT manual_seq_pkey PRIMARY KEY (id)
);
出于测试目的,我删除了外键约束。
- 更新实体映射
@Entity
@Table(name = "identity")
@JsonIgnoreProperties(ignoreUnknown = true)
public class UserEntity extends Auditable<Long> {
@Id
@SequenceGenerator(name="manual-seq", sequenceName = "manual_seq",allocationSize = 1)
@GeneratedValue(generator="manual-seq")
private Long id;
@Basic
@Column(name = "name", nullable = false)
private String name;
@MappedSuperclass
@JsonIgnoreProperties({"new", "createdDate", "createdById", "lastModifiedDate", "lastModifiedById", "version"})
abstract class Auditable<PK extends Serializable>{
@NotAudited
@CreatedDate
@Temporal(TemporalType.TIMESTAMP)
private Date createdDate;
@NotAudited
@CreatedBy
private Long createdById;
@LastModifiedDate
@Temporal(TemporalType.TIMESTAMP)
private Date lastModifiedDate;
@LastModifiedBy
private Long lastModifiedById;
@NotAudited
@Version
private Long version;
还原 spring.jpa.hibernate.use-new-id-generator-mappings
问题是扩展 AbstractPersistable 因为没有使用数据库序列。另请注意,出于测试目的,我已删除审核。
关于postgresql - 使用 postgres 表序列而不是共享 hibernate_sequence,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/57123067/