当应用Spring Boot和MyBatis来实现对数据库的操作时,能够依照以下步骤进行配置和开发:
- 确保曾经在我的项目的
pom.xml
文件中增加了Spring Boot和MyBatis的依赖。
<!-- Spring Boot 依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- MyBatis 依赖 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
<!-- MySQL 数据库驱动依赖 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
- 配置数据库连贯信息。在
application.properties
文件中增加以下配置:
# 数据库连贯信息
spring.datasource.url=jdbc:mysql://localhost:3306/db_example
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
# MyBatis 配置
mybatis.mapper-locations=classpath:mapper/*.xml
请依据理论状况批改数据库连贯URL、用户名和明码。
- 创立实体类(Entity)。例如,创立一个名为
User
的实体类,与数据库表的字段一一对应。
public class User {
private Long id;
private String name;
private String email;
// ... 其余字段的 getter 和 setter 办法
}
- 创立Mapper接口和XML映射文件。
在UserMapper.java
中定义数据库操作的办法。
@Mapper
public interface UserMapper {
List<User> getAllUsers();
User getUserById(Long id);
void createUser(User user);
void updateUser(User user);
void deleteUser(Long id);
}
在UserMapper.xml
中编写SQL语句的映射配置。
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.repository.UserMapper">
<resultMap id="userResultMap" type="com.example.entity.User">
<id property="id" column="id"/>
<result property="name" column="name"/>
<result property="email" column="email"/>
<!-- 其余字段映射 -->
</resultMap>
<select id="getAllUsers" resultMap="userResultMap">
SELECT * FROM users
</select>
<select id="getUserById" resultMap="userResultMap">
SELECT * FROM users WHERE id = #{id}
</select>
<insert id="createUser">
INSERT INTO users (name, email) VALUES (#{name}, #{email})
</insert>
<update id="updateUser">
UPDATE users SET name = #{name}, email = #{email} WHERE id =
#{id}
</update>
<delete id="deleteUser">
DELETE FROM users WHERE id = #{id}
</delete>
</mapper>
- 创立服务层(Service)。在
UserService.java
和UserServiceImpl.java
中定义对数据库操作的业务逻辑。
public interface UserService {
List<User> getAllUsers();
User getUserById(Long id);
void createUser(User user);
void updateUser(User user);
void deleteUser(Long id);
}
@Service
public class UserServiceImpl implements UserService {
private final UserMapper userMapper;
public UserServiceImpl(UserMapper userMapper) {
this.userMapper = userMapper;
}
@Override
public List<User> getAllUsers() {
return userMapper.getAllUsers();
}
@Override
public User getUserById(Long id) {
return userMapper.getUserById(id);
}
@Override
public void createUser(User user) {
userMapper.createUser(user);
}
@Override
public void updateUser(User user) {
userMapper.updateUser(user);
}
@Override
public void deleteUser(Long id) {
userMapper.deleteUser(id);
}
}
- 创立管制层(Controller)。在
UserController.java
中定义接口办法,并解决HTTP申请。
@RestController
@RequestMapping("/users")
public class UserController {
private final UserService userService;
public UserController(UserService userService) {
this.userService = userService;
}
@GetMapping
public List<User> getAllUsers() {
return userService.getAllUsers();
}
@GetMapping("/{id}")
public User getUserById(@PathVariable("id") Long id) {
return userService.getUserById(id);
}
@PostMapping
public void createUser(@RequestBody User user) {
userService.createUser(user);
}
@PutMapping("/{id}")
public void updateUser(@PathVariable("id") Long id, @RequestBody User user) {
user.setId(id);
userService.updateUser(user);
}
@DeleteMapping("/{id}")
public void deleteUser(@PathVariable("id") Long id) {
userService.deleteUser(id);
}
}
当初,能够应用Apifox或其余API测试工具来测试这些接口。例如,发送GET申请到/users
能够获取所有用户列表,发送POST申请到/users
能够创立新用户,发送PUT申请到/users/{id}
能够更新用户信息,发送DELETE申请到/users/{id}
能够删除用户。
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