feat(#2) : 게시판 기본 CRUD 기능 구현

EnjoyTripBackend/src/main/java/com/example/EnjoyTripBackend/controller/BoardController.java

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+package com.example.EnjoyTripBackend.controller;
+
+import com.example.EnjoyTripBackend.dto.Board.BoardDto;
+import com.example.EnjoyTripBackend.service.BoardService;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import static org.springframework.http.HttpStatus.CREATED;
+
+@RestController
+@RequestMapping("/api/boards")
+@RequiredArgsConstructor
+public class BoardController {
+
+    private final BoardService boardService;
+
+    @PostMapping("/")
+    public ResponseEntity<String> save(@Valid @RequestBody BoardDto boardDto){
+        Long id = boardService.save(boardDto);
+        return ResponseEntity.status(CREATED).body("게시글 등록 완료");
+    }
+
+    @GetMapping("/{id}")
+    public ResponseEntity<board> findById(@PathVariable("id") Long id) {
+        Board board = boardService.findById(id);
+        return ResponseEntity.status(OK).body(board);
+    }
+
+    @GetMapping
+    public ResponseEntity<List<board>> findAll() {
+        List<board> boardList = boardService.findAll();
+        return ResponseEntity.status(OK).body(boardList);
+    }
+
+    @PutMapping("/{id}")
+    public ResponseEntity<Long> update(@Valid @RequestBody BoardDto boardDto) {
+        Long boardId = boardService.update(boardDto);
+        return ResponseEntity.status(OK).body(boardId);
+    }
+
+    @DeleteMapping("/{id}")
+    public ResponseEntity<Void> delete(@PathVariable("id") Long id) {
+        boardService.delete(id);
+        return ResponseEntity.status(NO_CONTENT).build();
+    }
+
+}

EnjoyTripBackend/src/main/java/com/example/EnjoyTripBackend/dto/board/BoardDto.java

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+package com.example.EnjoyTripBackend.dto.Board;
+
+import jakarta.validation.constraints.NotEmpty;
+import jakarta.validation.constraints.NotNull;
+import lombok.NoArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@NoArgsConstructor
+public class BoardDto {
+
+    @NotNull
+    private Long memberId;
+
+    @NotEmpty
+    private String title;
+
+    @NotEmpty
+    private String content;
+
+}

EnjoyTripBackend/src/main/java/com/example/EnjoyTripBackend/repository/BoardRepository.java

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+package com.example.EnjoyTripBackend.repository;
+
+
+import com.example.EnjoyTripBackend.domain.Member;
+import org.apache.ibatis.annotations.Mapper;
+
+import java.util.Optional;
+
+@Mapper
+public interface BoardRepository {
+    Long save(Board board);
+    Board findById(Long id)
+    List<Board> findAll();
+    Long update(BoardDto boardDto);
+    void delete(Long id);
+}
+

EnjoyTripBackend/src/main/java/com/example/EnjoyTripBackend/service/BoardService.java

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+package com.example.EnjoyTripBackend.service;
+
+import com.example.EnjoyTripBackend.domain.Board;
+import com.example.EnjoyTripBackend.dto.Board.BoardDto;
+import com.example.EnjoyTripBackend.repository.BoardRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+
+@Service
+@RequiredArgsConstructor
+@Transactional(readOnly = true)
+public class BoardService {
+
+    private final BoardRepository boardRepository;
+
+    @Transactional
+    public Long save(BoardDto boardDto) {
+        Board board = Board.builder()
+                .memberId(boardDto.getMemberId())
+                .title(boardDto.getTitle())
+                .content(boardDto.getContent())
+                .build();
+        return boardRepository.save(board);
+    }
+
+    public Board findById(Long id) {
+        return boardRepository.findById(id)
+                .orElseThrow(() -> new EnjoyTripException(ErrorCode.BOARD_NOT_FOUND));
+    }
+
+    public List<Board> findAll(){
+        return boardRepository.findAll();
+//        return boardRepository.findAll().stream().map(this::Board).collect(Collector.toList());
+    }
+
+    @Transactional
+    public Long update(BoardDto boardDto){
+        Optional<Board> optionalBoard = boardRepository.findById(boardDto.getId());
+        if (!optionalBoard.isPresent()) {
+            throw new EnjoyTripException(
+                    "Board is not present in the database");
+        }
+        return boardRepository.update(boardDto);
+    }
+
+    public void delete(Long id){
+        Optional<Board> optionalBoard = boardRepository.findById(id);
+        if (!optionalBoard.isPresent()) {
+            throw new EnjoyTripException(
+                    "Board is not present in the database");
+        }
+        boardRepository.delete(id);
+    }
+}

EnjoyTripBackend/src/main/resources/mapper/board-query.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="com.example.EnjoyTripBackend.repository.BoardRepository">
+    <insert id="save" parameterType="com.example.EnjoyTripBackend.domain.Board">
+        insert
+        into board
+        values (#{id}, #{memberId}, #{title}, #{content}, now(), now())
+    </insert>
+
+    <select id="findById" parameterType="long" resultType="com.example.EnjoyTripBackend.domain.Board">
+        select *
+        from board
+        where board_id = #{id}
+    </select>
+
+    <select id="findAll" resultType="com.example.EnjoyTripBackend.domain.Board">
+        select *
+        from board
+    </select>
+
+    <update id="update"  parameterType="com.example.EnjoyTripBackend.dto.BoardDto" resultType="long">
+        update board
+        set member_id = #{memberId},
+            title = #{title},
+            content = #{content},
+            modifiedDate = #{modifiedDate}
+        where id = #{id}
+    </update>
+
+    <delete id="delete">
+        delete from board where id = #{id}
+    </delete>
+</mapper>