springboot postgresql create data without sequence - spring

Question

jdk1.8.0_202.jdk
psql -V 12.1
There is a problem creating and saving a postgresql object. When trying to create the object's id value is empty. I don't know why. Please tell me what to check.
package com.interpark.lab.tour.geolocation.model;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.vladmihalcea.hibernate.type.json.JsonBinaryType;
import lombok.Data;
import org.hibernate.annotations.GenericGenerator;
import org.hibernate.annotations.Type;
import org.hibernate.annotations.TypeDef;
import org.hibernate.annotations.TypeDefs;
import org.locationtech.jts.geom.Geometry;
import javax.persistence.*;
import java.io.Serializable;
import java.util.HashMap;
import java.util.List;
#Data
#Entity
#Table(name = "expedia_region_union")
#JsonInclude(JsonInclude.Include.NON_NULL)
#TypeDefs({
#TypeDef(name = "jsonb", typeClass = JsonBinaryType.class)
})
public class ExpediaRegionUnion {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column( columnDefinition = "uuid", updatable = false )
private String regionId;
#Column(columnDefinition = "region_type")
private String regionType;
#Column(columnDefinition = "region_name")
private String regionName;
#Column(columnDefinition = "region_name_full")
private String regionNameFull;
#Transient
private String regionDescriptor;
#Column(columnDefinition = "country_code")
private String countryCode;
#Column(columnDefinition = "coordinates")
private String coordinates;
#Column(columnDefinition = "center_longitude")
private String centerLongitude;
#Column(columnDefinition = "center_latitude")
private String centerLatitude;
#Type(type = "jsonb")
#Column(columnDefinition = "continent")
private HashMap continent;
#Type(type = "jsonb")
#Column(columnDefinition = "add_continent")
private List addContinent;
#Column(columnDefinition = "ancestors")
private String ancestors;
#Column(columnDefinition = "descendants")
private String descendants;
#Column(columnDefinition = "region_name_kr")
private String regionNameKr;
#Column(columnDefinition = "region_name_full_kr")
private String regionNameFullKr;
#Transient
#Column(columnDefinition = "parent_city_flag")
private String parentCityFlag;
#Transient
#Column(columnDefinition = "parent_city")
private String parentCity;
#Transient
#Column(columnDefinition = "boundaries")
private Geometry boundaries;
#Type(type = "jsonb")
#Column(name = "country")
private HashMap country;
#Column(columnDefinition = "city_ancestors")
private String cityAncestors;
#Type(type = "jsonb")
#Column(columnDefinition = "ancestors_info")
private List ancestorsInfo;
#Column(columnDefinition = "synonym")
private String synonym;
#Column(columnDefinition = "coordinates_nearby")
private String coordinatesNearby;
#Column(columnDefinition = "coordinates_nearby_auto")
private String coordinatesNearbyAuto;
#Type(type = "jsonb")
#Column(columnDefinition = "nearest_airport")
private HashMap nearestAirport;
#Type(type = "jsonb")
#Column(columnDefinition = "nearest_airport_in_country")
private HashMap nearestAirportInCountry;
#Type(type = "jsonb")
#Column(columnDefinition = "codes")
private HashMap codes;
#Type(type = "jsonb")
#Column(columnDefinition = "airport")
private List airport;
#Transient
private String countryCodeLower;
#Transient
#Type(type = "boolean")
#Column(columnDefinition = "display")
private Boolean display;
#Type(type = "jsonb")
#Column(columnDefinition = "jsonn")
private HashMap jsonn;
#Column(name = "jsonn_updated", columnDefinition = "BOOLEAN")
private Boolean jsonnUpdated;
#Column(name = "in_use", columnDefinition = "BOOLEAN")
private Boolean inUse;
#Column(name = "source_time")
private String sourceTime;
#Column(name = "city_home_flag")
private String cityHomeFlag;
#Column(columnDefinition = "source_from")
private String sourceFrom;
#Column(columnDefinition = "region_code")
private String regionCode;
#Column(columnDefinition = "sub_class")
private String subClass;
#Transient
private boolean selected;
}
I don't know why but, like this, When inserting, the region_id value is empty.
Hibernate: insert into expedia_region_union (add_continent, airport, ancestors, ancestors_info, center_latitude, center_longitude, city_ancestors, city_home_flag, codes, continent, coordinates, coordinates_nearby, coordinates_nearby_auto, country, country_code, descendants, in_use, jsonn, jsonn_updated, nearest_airport, nearest_airport_in_country, region_code, region_name, region_name_full, region_name_full_kr, region_name_kr, region_type, source_from, source_time, sub_class, synonym) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
What I don't understand is, as you can see below, it's made and put in like other things.
public void save(Map paramBean) throws JsonProcessingException {
ExpediaRegionUnion insert = new ExpediaRegionUnion();
insert.setRegionId("INTERPARK" + System.currentTimeMillis());
insert.setRegionType(paramBean.get("regionType") + "");
insert.setRegionName(paramBean.get("regionName") + "");
Can't I create an object without using auto increment? Because I thought I didn't need a sequence. Please let me know if I am wrong.
Hibernate: select currval('expedia_region_union_region_id_seq')
SQL Error: 0, SQLState: 42P01
오류: "expedia_region_union_region_id_seq" 이름의 릴레이션(relation)이 없습니다
Why hibernate wants sequences that I don't even need?

Answer 1

I delegated primary key generation to the database using GenerationType.IDENTITY. But I shouldn't have done that. Because the data in my table already created were not auto-incremented numeric ids. They were based on the Openstreetmap's local id. I write answers for such people.
as #Olivier Depriester says, using GenerationType.AUTO works well. I followed this article.
https://vladmihalcea.com/uuid-identifier-jpa-hibernate/
This is how I create uuid directly through a class in springboot without leaving pk creation in the database.
in psql, you type this.
CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
that extension makes you uuid-generator.
you just copy this. Place the files in the appropriate directory.
public class PostgreSQLUUIDGenerationStrategy
implements UUIDGenerationStrategy {
#Override
public int getGeneratedVersion() {
return 4;
}
#Override
public UUID generateUUID(
SharedSessionContractImplementor session) {
return ((Session) session).doReturningWork(connection -> {
try(
Statement statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery(
"select uuid_generate_v4()"
)
) {
while (resultSet.next()) {
return (UUID) resultSet.getObject(1);
}
}
throw new IllegalArgumentException("Can't fetch a new UUID");
});
}
}
in your entity class, you change configuration.
#Id
#GeneratedValue(
strategy = GenerationType.AUTO,
generator = "pg-uuid"
)
#GenericGenerator(
name = "pg-uuid",
strategy = "uuid2",
parameters = #org.hibernate.annotations.Parameter(
name = "uuid_gen_strategy_class",
value = "whatever.your.package.PostgresQLUUIDGenerationUtils"
)
)
private String regionId;
and this is mine.