[홈페이지 제작] 홈페이지 만들기 1 - 검색 기능 추가하기

1. View

<div class="container p-5">
			<!-- 검색 -->
    <div class="row justify-content-end mb-3">
        <div class="col-md-4">
            <form action="/" method="get" class="form-inline">
                <div class="input-group rounded">
                    <input class="form-control me-2 rounded-end" type="text" placeholder="Search..." name="keyword" required/>
                    <button class="btn btn-primary rounded-start" type="submit">검색</button>
                </div>
            </form>
        </div>
    </div>

2. 컨트롤러

@GetMapping("/")
public String index(
        HttpServletRequest request,
        @RequestParam(defaultValue = "0") Integer page,
        @RequestParam(defaultValue = "") String keyword) {

    // isEmpty -> null, 공백
    // isBlank -> null, 공백, 화이트 스페이스
    
    if(keyword.isBlank()){
        List<Board> boardList = boardRepository.findAll(page);
        // 전체 페이지 개수
        int count = boardRepository.count().intValue();
        // 5 -> 2page
        // 6 -> 2page
        // 7 -> 3page
        // 8 -> 3page
        int namerge = count % 3 == 0 ? 0 : 1;
        int allPageCount = count / 3 + namerge;

        request.setAttribute("boardList", boardList);
        request.setAttribute("first", page == 0);
        request.setAttribute("last", allPageCount == page + 1);
        request.setAttribute("prev", page - 1);
        request.setAttribute("next", page + 1);
    }else{
        List<Board> boardList = boardRepository.findAll(page, keyword);
        // 전체 페이지 개수
        int count = boardRepository.count(keyword).intValue();
        // 5 -> 2page
        // 6 -> 2page
        // 7 -> 3page
        // 8 -> 3page
        int namerge = count % 3 == 0 ? 0 : 1;
        int allPageCount = count / 3 + namerge;

        request.setAttribute("boardList", boardList);
        request.setAttribute("first", page == 0);
        request.setAttribute("last", allPageCount == page + 1);
        request.setAttribute("prev", page - 1);
        request.setAttribute("next", page + 1);
    }
    
    return "index";
}

3. 레파지토리

//like 절이 있으면 % 를 써야됨
    public Long count(String keyword) {
        Query query = em.createNativeQuery("select count(*) from board_tb where title like ?");
        query.setParameter(1, "%"+keyword+"%");
        return (Long) query.getSingleResult();
    }

public List<Board> findAll(Integer page, String keyword) {
        Query query = em.createNativeQuery("select * from board_tb where title like ? order by id desc limit ?, 3", Board.class);
        query.setParameter(1, "%"+keyword+"%");
        query.setParameter(2, page * 3);
        return query.getResultList();
    }

4. 결과 보기

<ul class="pagination d-flex justify-content-center">
    <li class="page-item {{#first}}disabled{{/first}}"><a class="page-link" href="?page={{prevPage}}&keyword={{keyword}}">Previous</a></li>
    <li class="page-item {{#last}}disabled{{/last}}"><a class="page-link" href="?page={{nextPage}}&keyword={{keyword}}">Next</a></li>
</ul>