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第五课 SpringBoot集成Mybatis（2）-配置文件版
文章目录
1. 引入依赖：pom.xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--SpringBoot集成Mybatis-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<!--mysql驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
2. 配置application.yml：添加Mapper自动扫描路径和配置文件路径
spring:
datasource:
driver-class-name : com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/ssm
username: root
password: root
mybatis:
mapper-locations: classpath:mybatis/mapper/*.xml #springboot集成mybatis 配置Mapper.xml映射文件路径
config-location: classpath:mybatis/config/mybatis-config.xml #springboot集成mybatis 配置mybatis配置文件路径
3. 编写Entity层：
- User.java
import java.util.Date;
public class User {
private Integer id;
private String username;
private Integer age;
private Date ctm;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public Date getCtm() {
return ctm;
}
public void setCtm(Date ctm) {
this.ctm = ctm;
}
}
- JsonResult.java
/**
* 描述: json格式数据返回对象，使用CustomJsonResultSerializer 来序列化
*/
public class JsonResult {
private String status = null;
private Object result = null;
public JsonResult status(String status) {
this.status = status;
return this;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public Object getResult() {
return result;
}
public void setResult(Object result) {
this.result = result;
}
}
4. 编写Dao层：
- UserMapper.java
/**
* @Description:
* @Author: zrblog
* @CreateTime: 2018-09-23 22:32
* @Version:v1.0
*/
@Repository
public interface UserMapper {
User queryUserById(Integer id);
List<User> queryAllUser();
}
5. 编写Service层
- UserService.java
/**
* @Description:
* @Author: zrblog
* @CreateTime: 2018-09-22 10:52
* @Version:v1.0
*/
public interface UserService {
User queryUserById(Integer id);
List<User> queryAllUser();
}
- UserServiceImpl.java
/**
* @Description:
* @Author: zrblog
* @CreateTime: 2018-09-22 10:57
* @Version:v1.0
*/
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public User queryUserById(Integer id) {
return userMapper.queryUserById(id);
}
@Override
public List<User> queryAllUser() {
return userMapper.queryAllUser();
}
}
6. 编写Controller层
- UserController.java
/**
* @Description:
* @Author: zrblog
* @CreateTime: 2018-09-22 11:10
* @Version:v1.0
*/
@RestController
@RequestMapping("/")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping(value = "user/{id}", method = RequestMethod.GET)
@ResponseBody
public ResponseEntity<JsonResult> queryUserById(@PathVariable(value = "id") Integer id) {
JsonResult jsonResult = new JsonResult();
try {
User user = userService.queryUserById(id);
jsonResult.setResult(user);
jsonResult.setStatus("success");
} catch (Exception e) {
jsonResult.setResult(e.getMessage());
jsonResult.setStatus("success");
}
return ResponseEntity.ok(jsonResult);
}
@RequestMapping(value = "users", method = RequestMethod.GET)
@ResponseBody
public ResponseEntity<JsonResult> queryUserById() {
JsonResult jsonResult = new JsonResult();
try {
List<User> users = userService.queryAllUser();
jsonResult.setResult(users);
jsonResult.setStatus("success");
} catch (Exception e) {
jsonResult.setResult(e.getMessage());
jsonResult.setStatus("success");
}
return ResponseEntity.ok(jsonResult);
}
}
7. 编写mybatis-config.xml文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<typeAliases>
</typeAliases>
</configuration>
8. 编写UserMapper.xml文件
<?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.springboot.mybatis2.mapper.UserMapper">
<resultMap id="BaseResultMap" type="com.springboot.mybatis2.domain.User">
<id column="id" property="id" jdbcType="INTEGER"/>
<result column="username" property="username" jdbcType="VARCHAR"/>
<result column="age" property="age" jdbcType="INTEGER"/>
<result column="ctm" property="ctm" jdbcType="TIMESTAMP"/>
</resultMap>
<sql id="Base_Column_List">
id,username,age,ctm
</sql>
<select id="queryUserById" resultMap="BaseResultMap">
SELECT
<include refid="Base_Column_List"/>
FROM tb_user
WHERE id = #{id,jdbcType=INTEGER}
</select>
<select id="queryAllUser" resultMap="BaseResultMap">
SELECT
<include refid="Base_Column_List"/>
FROM tb_user
</select>
</mapper>
9. 配置MapperScan注解
注意：
// xxxMapper接口可以使用@Mapper注解，但是每个mapper都加注解比较麻烦，所以统一配置@MapperScan在扫描路径在application类中
@SpringBootApplication
@MapperScan(value = "com.springboot.mybatis.mapper")
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
10. 测试
{
"status": "success",
"result": [
{
"id": 1,
"username": "张三",
"age": 18,
"ctm": 1537583657000
},
{
"id": 2,
"username": "Honey",
"age": 22,
"ctm": 1537583657000
},
{
"id": 3,
"username": "王五",
"age": 19,
"ctm": 1537583657000
},
{
"id": 5,
"username": "Tony",
"age": 66,
"ctm": null
},
{
"id": 6,
"username": "Jack",
"age": 23,
"ctm": null
}
]
}