[JAVA] Spring Boot + Heroku Postgres

I struggled with the details, so I will write it down as a memo for myself.

It is assumed that Heroku Postgres has been added to the Heroku app. 2018-08-05_11h48_15.png

Spring Boot is 2.0.4.

Install the psql command on your local machine

Looking at the Heroku Potgres Settings (above), it says "** Heroku CLI **" and the following command is written.

heroku pg:psql datastore name--app app name

I got an error when I tried it in my environment. You need to put ** psql ** on your local machine. It's natural w

-->Connecting to datastore name
 !    The local psql command could not be located. For help installing psql, see
 !    https://devcenter.heroku.com/articles/heroku-postgresql#local-setup

Refer to URL above and go to your Windows 10 environment Windows Setup I installed it with articles / heroku-postgresql # set-up-postgres-on-windows). Then, I set the environment variable to "C: \ Program Files \ PostgreSQL \ \ bin".

heroku pg:psql datastore name--app app name
-->Connecting to datastore name
psql (10.4)
SSL connection(protocol: TLSv1.2, encryption method: ECDHE-RSA-AES256-GCM-SHA384, bit length:256, compression:off)
"help"Get help with.

app name::DATABASE=>

You have successfully connected.


This is a part that has nothing to do with Spring Boot or Heroku, but I made a note because I didn't know the Postgres command too much.

Database list display


When I did this, a lot of databases came out, but I can see the DBs of other owners ...? Is it multi-tenant?

Database selection

\c database name
SSL connection(protocol: TLSv1.2, encryption method: ECDHE-RSA-AES256-GCM-SHA384, bit length:256, compression:off)
Database"xxxx"To the user"xxxx"Connected as.

Table list display

After creating a table with create table, display the table.

Relationship list
 public   | nogizaka |table| xxxxxxxxxxxxx

Detailed display of table

See details such as columns.

\d nogizaka

The schema is super omission.

Column|Mold|Collation|Null value allowed|Default
 id   | integer               |          |               |
 name | character varying(64) |          |               |

Spring Boot

Spring Initializr

Create a project template with Spring Initializr. I chose the following three dependencies. You don't have to have a web, but I've included it to make the runtime endpoint a REST API.



The contents of the connection to the database were defined and operated as follows based on the Database Credentials in the Settings of Heroku Postgres.

spring.datasource.url=jdbc:postgresql://hostname:port number/Database name?sslmode=require
spring.datasource.username=User name

When I first got hooked, the following two points were leaked.

--The URL "postgresql" was changed to "postgres" (I copied the URL written in the Heroku CLI) --I didn't add the sslmode parameter


All you have to do is write.



package tech.kikutaro.herokupostgres;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

public class Nogizaka {
    private long id;

    private String name;

    public long getId() {
        return id;

    public void setId(long id) {
        this.id = id;

    public String getName() {
        return name;

    public void setName(String name) {
        this.name = name;

It may be better to use Lombok for setter and getter.



package tech.kikutaro.herokupostgres;

import org.springframework.data.jpa.repository.JpaRepository;

public interface NogizakaRepository extends JpaRepository<Nogizaka, Long> {




package tech.kikutaro.herokupostgres;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

public class NogizakaService {
    NogizakaRepository nogirepo;

    public long count() {
        return nogirepo.count();

    public Nogizaka getMember(long id) {
        return nogirepo.getOne(id);

For the time being, just count and get.



package tech.kikutaro.herokupostgres;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

public class HerokupostgresApplication {

	private NogizakaService nogiService;

	public static void main(String[] args) {
		SpringApplication.run(HerokupostgresApplication.class, args);

	public String count() {
		return Long.toString(nogiService.count());

	public String getName(@PathVariable("id") long id) {
		return nogiService.getMember(id).getName();

Execution result

It worked safely.





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