[JAVA] Until data acquisition with Spring Boot + MyBatis + PostgreSQL

I didn't bother so much a while ago, I had a hard time doing it recently, so I used it as a memo for myself.


  1. Java 8 installation
  2. eclipse installation
  3. Install PostgreSQL 11

Install Spring Tool 3 Add-On (STS) in eclipse

Search for sts in the eclipse marketplace and press the install button. スクリーンショット 2019-04-07 18.50.53.png

You can use a dedicated development tool (STS), This time we will use a plugin.

Spring Boot project creation

Select New → Project → Spring Starter Project and

スクリーンショット 2019-04-07 18.55.47.png

The dependency is like this.

スクリーンショット 2019-04-07 18.56.28.png

Project creation is OK by pressing Done.

Folder structure

スクリーンショット 2019-04-07 19.43.43.png I will go like this.

Creating a class

1-1 Controller creation


public class HelloController {

	private HelloService helloService;

	public String init(Model model) {

		List<HelloBean> list = helloService.selectName();

		return "hello";

Service creation


public class HelloService {

	private HelloMapper helloMapper;

	public List<HelloBean> selectName(){
		return helloMapper.selectEmpAll();

Created by Dao.


CREATE TABLE emp_name(
id int,
name varchar(20)

Create a table with the above contents. Since it is for testing, neither PRIMARY nor UNIQUE is set for the time being.


public interface HelloMapper {

	List<HelloBean> selectEmpAll();


<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
<mapper namespace="com.demo.mapper.HelloMapper">
	<select id="selectEmpAll" resultType="com.demo.bean.HelloBean">
		select * from

html creation


<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<meta charset="UTF-8">
<title>Insert title here</title>
	<table border="1">
			<th>employee number</th>
			<th>Employee name</th>
		<tr th:each="emp : ${list}">
			<td th:text="${emp.id}"></td>
			<td th:text="${emp.name}"></td>

Environmental setting

Create mybatis config. If the column name of the table is snake case, convert it to camel case and Added a setting that associates with the bean variable name. I won't use it this time, but I want to remember it.


<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
		<setting name="mapUnderscoreToCamelCase" value="true"/>

Load the created mybatis-config


package com.demo;

import javax.sql.DataSource;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.core.io.ClassPathResource;

public class SampleApplication {

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

    public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        //Read config file
        sessionFactory.setConfigLocation(new ClassPathResource("/mybatis-config.xml"));

        return sessionFactory.getObject();

Added connection settings with DB.


spring.datasource.username=postgres    #According to your own environment
spring.datasource.password=postgres    #According to your own environment

That's it.


Right click on the project and run → maven install When BUILD SUCCESS appears, right-click again and execute → Spring boot application selection Open http: // localhost: 8080 / hello from your browser.

スクリーンショット 2019-04-07 20.07.13.png

If it looks like this, it's OK.


Is the setting reduced compared to Spring MVC? I think it will be easier to understand once you get used to it.

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