SpringBoot  jdbctemplate使用方法解析

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：

      com.alibaba
      druid-spring-boot-starter
      1.1.10
    

    
      mysql
      mysql-connector-java
      5.1.15
    

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

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);
  }
}

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