Use postgres table sequence instead of sharing hibernate_sequence - postgresql

Question

When I do anything with a table, it always show the error:
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
I DON'T want to use hibernate_sequence to share id sequence between tables, but want to define id seq for each table and use them respectively.
I use Spring Boot 2.1.6.RELEASE, Spring Data JPA (Hibernate 5.3.10.Final), and Postgres 11.2, and define the id field with BigSerial type and hope to use the id sequence of each table in respective entity class.
The demo repo is here: https://github.com/Redogame/share_hibernate_sequence
Create user table (use identity as table name because user is a Postgres reserved keyword).
By defining id with bigserial type, Postgres will create a identity_id_seq automatically, and I verified that identity_id_seq has been created successfully.
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
);
Specify a sequence generator to use this id sequence:
#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;
But it doesn't work. I also tried to config spring.jpa.hibernate.use-new-id-generator-mappings and spring.jpa.properties.hibernate.id.new_generator_mappings, but still not work.
spring:
jpa:
hibernate:
use-new-id-generator-mappings: false
properties:
hibernate:
id:
new_generator_mappings: false
I expect not to use hibernate_sequence, that is: don't execute select nextval ('hibernate_sequence') before/after any SQL statement.

Answer 1

Try the below steps
CREATE SEQUENCE IF NOT EXISTS manual_seq;
Change create table script
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)
);
I removed the foreign key constraint for testing purposes.
Update the entity mapping
#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;
Revert the spring.jpa.hibernate.use-new-id-generator-mappings
The issue was extending AbstractPersistable because of which database sequence was not getting used. Also, note I have removed the audit for testing purposes.

Answer 2

The same problem was happening to me. I explicitly set spring.jpa.properties.hibernate.id.new_generator_mappings=false but select nextval ('hibernate_sequence') was still run by Hibernate.
I found that when we use the #GeneratedValue annotation without setting a strategy, it defaults to AUTO, which means, Hibernate will try to generate the ID value using hibernate_sequence and then it wil fail because it doesn't exist in the database.
So, I made #GeneratedValue (strategy = GenerationType.IDENTITY) and tried again. In this case, the ID value was generated by my identity column in the database (the primary key that is automatically incremented) and not by hibernate_sequence.
create table users (id serial not null, name varchar(250), primary key (id));