SpringBoot通过MyBatis连接数据库有2种方法:
- 1.注解
- 2.XML文件
1.注解
1.构建项目
2.添加依赖:
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- 引入starter-->
<!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<!-- MySQL的JDBC驱动包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- 引入第三方数据源 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.6</version>
</dependency>
</dependencies>
3.配置属性文件:
#mybatis.type-aliases-package=net.xdclass.base_project.domain
#可以自动识别
#spring.datasource.driver-class-name =com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/movie?useUnicode=true&characterEncoding=utf-8
spring.datasource.username =root
spring.datasource.password =password
#如果不使用默认的数据源 (com.zaxxer.hikari.HikariDataSource)
spring.datasource.type =com.alibaba.druid.pool.DruidDataSource
#控制台打印sql
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl
4.启动类(SpringApplication)添加mapper扫描
@MapperScan("net.xdclass.base_project.mapper")
5.开发Mapper,Mapper类是访问数据库的接口
public interface UserMapper{
@Insert("Insert into user(name,phone,create_time,age) values(#{name},#{phone},#{createTime},#{age})")
int insert(User user);
}
添加@Options(userGeneratedKeys=true,keyProperty="id",keyColumn="id") //key Property java对象的属性,key Column表示数据库的字段
6.添加User用户(domain)
public class User {
private int id;
private String name;
private String phone;
private int age;
private Date createTime;
xxx(相应的get/set方法)
}
7.添加service层
UserService:
public interface UserService {
public int add(User user);
}
UserServiceImpl:
@Service
public class UserServiceImpl implements UserService{
@Autowired
private UserMapper userMapper;
@Override
public int add(User user) {
userMapper.insert(user);
int id = user.getId();
return id;
}
}
8.添加Controller层
@RestController
@RequestMapping("/api/v1/user")
public class UserController {
@Autowired
private UserService userService;
@GetMapping("add")
public Object add(){
User user = new User();
user.setAge(11);
user.setCreateTime(new Date());
user.setName("xdclass");
user.setPhone("10010000");
int id = userService.add(user);
return JsonData.buildSuccess(id);
}
}
9.select,update, delete的使用
1.从数据转成对象
public interface userMapper{
@Select("select * from user")
@Results({
@Result(column="数据库字段1",property="对象的字段1"),
@Result(column="数据库字段2",property="对象的字段2")
})
List<User> getAll();
}
调用的时候(直接在controller给调用了):
@GetMapping("findAll")
public Object findAll(){
return JsonData.buildSuccess(userMapper.getAll());
}
JsonData类在同层目录下
2.根据id找对象(id怎么传进去-》findById调用的时候传入id)
public interface userMapper{
@Select("Select * from user where id=#{id}")
@Results({
@Result(column="数据库字段1",property="对象的字段1"),
@Result(column="数据库字段2",property="对象的字段2")
})
User findById(Long id);
}
3.更新数据库对象
public interface userMapper{
@Update("UPDATE user SET name=#{name} WHERE id =#{id}")
void update(User user);
}
4.删除数据库对象
public interface userMapper{
@Delete("DELETE FROM user WHERE id =#{userId}")
void delete(Long userId);
}
2.XML文件
https://blog.csdn.net/lr131425/article/details/76269236(这里的model类文件写错了)
主要区别在于怎么样实现Mapper层
XML的代码在https://github.com/Winster-cheng/SpringBoot-JDBC
原文地址:https://www.cnblogs.com/WinseterCheng/p/9982204.html
时间: 2024-11-12 10:51:06