Spring 在JPA+THYMELEAF中按标题查找

我的数据库中有一个多行列表，但我的查询只返回一行，而不是更多行

我想按标题查找我的书籍，但例如，当我有多本书的标题中有相同的单词时，我想显示这两本书，但查询不会返回它

HTML页面

图书管理员

书库

图书服务

控制台日志

在控制台中，我看到3行搜索到的单词，但在我的网页上，我只看到1行。我想我的控制器model.addAttribute可能有问题

原因可能是什么

我已经修改了控制器：

@GetMapping({"/searchbook","/searchbook{title}"})
public String searchBookByTitle(@ModelAttribute("title") @RequestParam("title") Optional<String> title, Model model,Book book){
    System.out.println(title);

    if(title.isPresent()) {
        List<Book> bookList = bookService.findBookByTitle(title.get());
        model.addAttribute("book",book);
        model.addAttribute("book2", bookList);
        return "book/searchbook";
    }
    else
    {
        return "book/searchbook";}
}

还有百里香

2. Thymeleaf code

<form action="#" th:action="@{/searchbook(param=${book?.getBookTitle()})}" th:object="${book}" >

    <label for="title">Find Book by Title</label>
    <input type="text" id="title" name="title" th:value="${book?.getBookTitle()}" placeholder="Book Title"/>
    <input type="submit" value="Search"/>

    <table id="table1" th:object="${book2}">
        <tr>
            <th>ID</th>
            <th>Title</th>
            <th>Author</th>
            <th>Copies</th>
        </tr>
        <tr th:each="carte, state :${book2}" id="tr1"
                th:classappend="${state.odd}?'odd-row':'even-row'">
            <td th:text="${state.count}">id</td>
            <td th:text="${carte.bookTitle}">title</td>
            <td th:text="${carte.bookAuthor}">author</td>
            <td th:text="${carte.bookCopies}">copies</td>
        </tr>
    </table>
 <!--    <a th:href="@{/update(idNumber=${reader?.idNumber},firstname=${reader?.firstname})}" th:field="*{firstname}">Update</a>
     <a th:href="@{/delete(idNumber=${reader?.idNumber})}" th:value="${reader?.idNumber}">Delete</a>
-->
</form>

---

您在模型中只存储了一本书，或者更确切地说，您存储了所有的书，但最后一本书覆盖了前一本书。如果要显示书籍列表，则模型必须包含。。。书籍列表：model.addAttributebooks、bookList；非常感谢。我已经决定了。

@Repository
public interface BookRepository extends CrudRepository<Book,Long> {

    @Query(value = "SELECT * FROM BOOK where book_title like %:bookTitle%",nativeQuery = true)
    List<Book> findBooksByBookTitle(String bookTitle);
}

@Override
public List<Book> findBookByTitle(String title) {
    List<Book> books = new ArrayList<>();
    bookRepository.findBooksByBookTitle(title)
                  .forEach(books::add);
    for(Book book:books)
                System.out.println(book);
    return books;
}

2019-10-13 20:50:44.879 DEBUG 16322 --- [nio-8080-exec-6] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to public java.lang.String vleunti.springbootframework.libraryapp.controllers.BookController.searchBookByTitle(java.util.Optional<java.lang.String>,org.springframework.ui.Model)
    Optional[Amintiri]
    2019-10-13 20:50:44.880 DEBUG 16322 --- [nio-8080-exec-6] org.hibernate.SQL                        : SELECT * FROM BOOK where book_title like ?
    Book{id=1, bookTitle='Amintiri din Copilarie', bookAuthor='Ion Creanga', bookCopies=3}
    Book{id=2, bookTitle='Amintiri de Acasa', bookAuthor='Victor Leunti', bookCopies=1}
    Book{id=3, bookTitle='Amintiri de altadata', bookAuthor='Vasea Mure', bookCopies=1}

@GetMapping({"/searchbook","/searchbook{title}"})
public String searchBookByTitle(@ModelAttribute("title") @RequestParam("title") Optional<String> title, Model model,Book book){
    System.out.println(title);

    if(title.isPresent()) {
        List<Book> bookList = bookService.findBookByTitle(title.get());
        model.addAttribute("book",book);
        model.addAttribute("book2", bookList);
        return "book/searchbook";
    }
    else
    {
        return "book/searchbook";}
}

2. Thymeleaf code

<form action="#" th:action="@{/searchbook(param=${book?.getBookTitle()})}" th:object="${book}" >

    <label for="title">Find Book by Title</label>
    <input type="text" id="title" name="title" th:value="${book?.getBookTitle()}" placeholder="Book Title"/>
    <input type="submit" value="Search"/>

    <table id="table1" th:object="${book2}">
        <tr>
            <th>ID</th>
            <th>Title</th>
            <th>Author</th>
            <th>Copies</th>
        </tr>
        <tr th:each="carte, state :${book2}" id="tr1"
                th:classappend="${state.odd}?'odd-row':'even-row'">
            <td th:text="${state.count}">id</td>
            <td th:text="${carte.bookTitle}">title</td>
            <td th:text="${carte.bookAuthor}">author</td>
            <td th:text="${carte.bookCopies}">copies</td>
        </tr>
    </table>
 <!--    <a th:href="@{/update(idNumber=${reader?.idNumber},firstname=${reader?.firstname})}" th:field="*{firstname}">Update</a>
     <a th:href="@{/delete(idNumber=${reader?.idNumber})}" th:value="${reader?.idNumber}">Delete</a>
-->
</form>