SpringBoot 中 jdbctemplate 的使用

Posted 2021-02-20 滴水穿石不是靠力，而是因为不舍昼夜。

 

 

Spring为传统的jdbc API进行封装,简化持久层操作,虽然jdbcTemplate很灵活，但和ORM框架相比jdbcTemplate功能就显得力不从心了,学习jdbcTemplate是为学习ORM框架做铺垫
ORM:对象关系映射 O:对象 R:关系 M:映射

下面简单介绍下 Springboot 应用中如何使用 JdbcTemplate 对数据库进行操作；

1、使用 IDEA 创建 SpringBoot 项目，引入数据库连接依赖：

      <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.15</version>
        </dependency>

 

2、MYSQL 数据库建测试表　

CREATE TABLE `book` (
  `book_id` INT(11) NOT NULL AUTO_INCREMENT,
  `book_name` VARCHAR(200) DEFAULT NULL,
  `price` INT(11) DEFAULT NULL,
  PRIMARY KEY (`book_id`)
) ENGINE=INNODB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8

3、创建 bean

/**
 * @author wdh01
 * @create 2020-04-29 23:59
 */
public class Book {
    private Integer id;
    private String book_name;
    private double price;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getBook_name() {
        return book_name;
    }

    public void setBook_name(String book_name) {
        this.book_name = book_name;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }
}

4、编写 service 

 

@Service
public class BookService {
    @Autowired
    JdbcTemplate jdbcTemplate;

    //insert
    public Integer addBook(Book book) {
        return jdbcTemplate.update("insert book (book_name,price) values (?,?)", book.getBook_name(), book.getPrice());
    }
    //update 操作
    public Integer updateBook(Book book) {
        return jdbcTemplate.update("update book set price = ? where book_id = ?", book.getPrice(),book.getId());
    }
    //delete
    public Integer deleteBook(Book book) {
        return jdbcTemplate.update("delete from  book where book_id = ?",book.getId());
    }
}

 

 5、编写测试类

@SpringBootTest
class JdbctemplateApplicationTests {

    @Autowired
    BookService bookService;

    @Test
    void contextLoads() {
        Book book = new Book();
        book.setBook_name("笑傲江湖");
        book.setPrice(120);

        bookService.addBook(book);
    }

    @Test
    public void testUpdate() {
        Book book = new Book();
        book.setPrice(10);
        book.setId(5);
        bookService.updateBook(book);
    }

    @Test
    public void testDelete() {
        Book book = new Book();
        book.setId(5);
        bookService.deleteBook(book);
    }

}