SpringBoot整合Mybatis（注解版）+Druid

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/a549654065/article/details/86764422

环境：
操作系统：Window10企业版
IDE：IntelliJ IDEA 2018.2.4
数据库：MySQL

话不多说，直接实战。

新建项目，在新建的时候选择以下依赖

IDEA则会自动帮我们导入以下依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
            <version>2.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

添加Druid数据源依赖，在pom.xml文件下添加如下依赖

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.13</version>
        </dependency>

创建数据库，在Navicat里面创建一个名为book的数据库，并创建数据表tbl_book，并插入数据，创建的数据表如下：

配置Druid数据源，在application.yml文件下添加如下代码。（默认是application.properties文件，个人比较喜欢在resource文件下创建application.yml文件来进行配置）

spring:
  datasource:
      # 数据库访问配置, 使用druid数据源
      type: com.alibaba.druid.pool.DruidDataSource
      driver-class-name: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://localhost:3306/book?characterEncoding=utf8&useSSL=false&serverTimezone=UTC&rewriteBatchedStatements=true
      username: root
      password: 123456

如果application.yml配置文件的driver-class-name标红的话

那直接到pom.xml

创建实体类和Mapper接口。

实体类：

public class BookEntity {
        private int book_id;
        private String book_name;
        private String isbn;
        private String author;
        public int getBook_id() {
            return book_id;
        }
        public void setBook_id(int book_id) {
            this.book_id = book_id;
        }
        public String getBook_name() {
            return book_name;
        }
        public void setBook_name(String book_name) {
            this.book_name = book_name;
        }
        public String getIsbn() {
            return isbn;
        }
        public void setIsbn(String isbn) {
            this.isbn = isbn;
        }
        public String getAuthor() {
            return author;
        }
        public void setAuthor(String author) {
            this.author = author;
        }
}

Mapper接口

@Mapper
public interface BookMapper {

    @Select("SELECT * FROM tbl_book")
    List<BookEntity> selAllBooks();

    @Select("SELECT * FROM tbl_book WHERE book_name LIKE #{keyword}")
    List<BookEntity> selBooks(String keyword);

    @Insert("INSERT INTO tbl_book(book_name,isbn,author) VALUES(#{book_name},#{isbn},#{author})")
    int addBooks(BookEntity book);

    @Delete("DELETE FROM tbl_book WHERE book_id = #{book_id}")
    int delBooks(int book_id);

    @Select("SELECT COUNT(*) FROM tbl_book")
    int booksCount();
}

注意：Mapper接口要加上@Mapper注解或者在启动类加上@MapperScan(“xxx.xxx.xxx”)包扫描的注解

编写Service层接口以及其实现类

public interface BookService {
    List<BookEntity> selAllBooks();

    List<BookEntity> selBooks(String keyword);

    int addBooks(BookEntity book);

    int delBooks(int book_id);

}

@Service
public class BookServiceImpl implements BookService {

    @Autowired
    private BookMapper bookMapper;

    @Override
    public List<BookEntity> selAllBooks() {
        return bookMapper.selAllBooks();
    }

    @Override
    public List<BookEntity> selBooks(String keyword) {
        return bookMapper.selBooks(keyword);
    }

    @Override
    public int addBooks(BookEntity book) {
        return bookMapper.addBooks(book);
    }

    @Override
    public int delBooks(int book_id) {
        return bookMapper.delBooks(book_id);
    }
    
}

在resource目录下创建templates文件夹，在templates文件夹下编写四个html页面，index索引页面，addBook添加书籍页面，selBooks查询书籍页面，selResult返回结果页面

index.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>首页</title>
</head>
<body>
<a th:href="@{/book/add}">添加</a>
<a th:href="@{/book/toSel}">查询</a>
</body>
</html>

addBook.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form th:action="@{/book}" method="post">
    <table border="1" cellspacing="0" cellpadding="0" style="align:center;">
        <tr><td>图书名称:</td><td><input type="text" name="book_name"></td></tr>
        <tr><td>国际标准书号:</td><td><input type="text" name="isbn"></td></tr>
        <tr><td>作者:</td><td><input type="text" name="author"></td></tr>
        <tr><td><input type="submit" value="提交"></td><td><input type="button" value="返回"></td>
        </tr>
    </table>
</form>
</body>
</html>

selBooks.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form method="post" th:action="@{/book/sel}">
    <input type="text" name="keyword"><input type="submit" value="查询">
</form>
</body>
</html>

selResult.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<a th:href="@{/book/add}">新增</a>
<br>
<table border="1" cellspacing="0" cellpadding="0" style="align:center;">
    <tr bgcolor="ff9900" style="font-weight:bold;">
        <th>图书编号</th>
        <th>图书名称</th>
        <th>国际标准号</th>
        <th>作者</th>
    </tr>
    <tr th:each="book:${books}">
        <td>[[${book.book_id }]]</td>
        <td>[[${book.book_name }]]</td>
        <td>[[${book.isbn }]]</td>
        <td>[[${book.author }]]</td>
        <form method="post" id="deleteForm" th:action="@{/book/}+${book.book_id}">
            <input type="hidden" name="_method" value="delete">
            <td>|<button type="submit" onclick='return confirm("确定要删除吗?")'
            >删除</button></td>
        </form>
    </tr>
</table>
</body>
</html>

编写BookController控制器

@Controller
public class BookController {

    @Autowired
    private BookService bookService;

    @RequestMapping("/book/add")
    public String toAddBook(){
        return "book/addBook";
    }

    @RequestMapping("/book/toSel")
    public String toSelBook(){
        return "book/selBooks";
    }

    @PostMapping("/book")
    public String addBook(BookEntity bookEntity){
        bookService.addBooks(bookEntity);
        return "redirect:/book/selAll";
    }

    @DeleteMapping("/book/{id}")
    public String delBook(@PathVariable Integer id){
        bookService.delBooks(id);
        return "redirect:/book/selAll";
    }

    @RequestMapping("/book/selAll")
    public String selAllBook(Model model){
        List<BookEntity> bookEntityList = bookService.selAllBooks();
        model.addAttribute("books",bookEntityList);
        return "book/selResult";
    }

    @PostMapping("/book/sel")
    public String selBook(String keyword, Model model){
        if (keyword != null && keyword.length() > 0 ){
            List<BookEntity> bookEntityList = bookService.selBooks(keyword);
            model.addAttribute("books",bookEntityList);
            return "book/selResult";
        }else
            return "redirect:/book/selAll";
    }
}

运行界面如下：