Month: March 2021

Controller

	@RequestMapping(value = "edit/{id}", method=RequestMethod.GET)
	public ModelAndView edit(@ModelAttribute MyData mydata,
			@PathVariable int id, ModelAndView mav) {
		mav.setViewName("edit");
		mav.addObject("title","edit mydata.");
		Optional<MyData> data = repository.findById((long)id);
		mav.addObject("formModel", data.get());
		return mav;
	}
	
	@RequestMapping(value = "edit", method=RequestMethod.POST)
	@Transactional(readOnly=false)
	public ModelAndView update(@ModelAttribute MyData mydata,
			ModelAndView mav) {
		repository.saveAndFlush(mydata);
		return new ModelAndView("redirect:/");
	}

IDの値があるので、saveAndFlushでupdateされる

うお、Javaでやるとビビるな。なんでだろ〜

データ初期化処理

import javax.annotation.PostConstruct;

@PostConstruct
public void init() {
	MyData d1 = new MyData();
	d1.setName("yamada");
	d1.setAge(20);
	d1.setMail("yamada@gmail.com");
	d1.setMemo("this is my data!");
	repository.saveAndFlush(d1);
	MyData d2 = new MyData();
	d2.setName("hanako");
	d2.setAge(18);
	d2.setMail("hanako@gmail.com");
	d2.setMemo("hi there!");
	repository.saveAndFlush(d2);
	MyData d3 = new MyData();
	d3.setName("sachiko");
	d3.setAge(35);
	d3.setMail("sachiko@gmail.com");
	d3.setMemo("work hard!");
	repository.saveAndFlush(d3);
}

template/edit.html

<h1>Edit page</h1>
	<table>
		<form method="post" action="/edit" th:object="${formModel}">
		<input type="hidden" name="id" th:value="*{id}">
		<tr>
			<td><label for="name">名前</label></td>
			<td><input type="text" name="name" th:value="*{name}"></td>
		</tr>
		<tr>
			<td><label for="age">年齢</label></td>
			<td><input type="text" name="age" th:value="*{age}"></td>
		</tr>
		<tr>
			<td><label for="mail">メール</label></td>
			<td><input type="text" name="mail" th:value="*{mail}"></td>
		</tr>
		<tr>
			<td><label for="memo">メモ</label></td>
			<td><textarea name="memo" th:text="*{memo}" cols="20" rows="5"></textarea></td>
		</tr>
		<tr>
			<td></td>
			<td><input type="submit"/></td>
		</tr>
		</form>
	</table>

### MyDataRepository

package com.example.demo.repositories;

import com.example.demo.MyData;

import java.util.Optional;

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

@Repository
public interface MyDataRepository extends JpaRepository<MyData, Long> {
	
	public Optional<MyData> findById(Long name);
}

なるほど、基礎的なことはわかってきた。