SpringBoot(五) SpringBoot整合mybatis
一:项目结构:

二:pom文件如下:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</version>
</parent> <dependencies>
<!-- Spring-Mybatis -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.0</version>
</dependency>
<!-- jdbcTemplate -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency> <!-- MySQL连接 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- Add typical dependencies for a web application -->
<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> </dependencies>
三:数据库配置:
spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://192.168.1.20:3306/test
username: root
password: root123
四:代码说明:
最开始使用mybati比较麻烦,各种配置文件、实体类、dao层映射关联、还有一大推其它配置。当然mybatis也发现了这种弊端,初期开发了generator可以根据表结果自动生产实体类、配置文件和dao层代码,可以减轻一部分开发量;后期也进行了大量的优化可以使用注解了。
于是两种使用方式都介绍一下,一、无配置注解版 二、配置文件版
1.无配置文件注解版
加入配置文件
————————————————
实体类User.class package cn.saytime.bean; import java.util.Date; /**
* @ClassName cn.saytime.bean.User
* @Description
* @date 2017-07-04 22:47:28
*/
public class User { private int id;
private String username;
private int age;
private Date ctm; public User() {
} public User(String username, int age) {
this.username = username;
this.age = age;
this.ctm = new Date();
} // Getter、Setter
package cn.saytime.mapper; import cn.saytime.bean.User;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update; import java.util.List; // @Mapper 这里可以使用@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
public interface UserMapper { @Select("SELECT * FROM tb_user WHERE id = #{id}")
User getUserById(Integer id); @Select("SELECT * FROM tb_user")
public List<User> getUserList(); @Insert("insert into tb_user(username, age, ctm) values(#{username}, #{age}, now())")
public int add(User user); @Update("UPDATE tb_user SET username = #{user.username} , age = #{user.age} WHERE id = #{id}")
public int update(@Param("id") Integer id, @Param("user") User user); @Delete("DELETE from tb_user where id = #{id} ")
public int delete(Integer id); ————————————————
UserService.class package cn.saytime.service; import cn.saytime.bean.User;
import org.springframework.stereotype.Service; import java.util.List; /**
* @ClassName cn.saytime.service.UserService
* @Description
*/
public interface UserService { User getUserById(Integer id); public List<User> getUserList(); public int add(User user); public int update(Integer id, User user); public int delete(Integer id);
UserServiceimpl.class package cn.saytime.service.impl; import cn.saytime.bean.User;
import cn.saytime.mapper.UserMapper;
import cn.saytime.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service; import java.util.List; /**
* @ClassName cn.saytime.service.impl.UserServiceImpl
* @Description
*/
@Service
public class UserServiceImpl implements UserService { @Autowired
private UserMapper userMapper; @Override
public User getUserById(Integer id) {
return userMapper.getUserById(id);
} @Override
public List<User> getUserList() {
return userMapper.getUserList();
} @Override
public int add(User user) {
return userMapper.add(user);
} @Override
public int update(Integer id, User user) {
return userMapper.update(id, user);
} @Override
public int delete(Integer id) {
return userMapper.delete(id);
}
}
JsonResult.class 通用json返回类:
package cn.saytime.bean;
public class JsonResult {
private String status = null;
private Object result = null;
public JsonResult status(String status) {
this.status = status;
return this;
}
// Getter Setter
UserController.class(Restful风格) package cn.saytime.web; import cn.saytime.bean.JsonResult;
import cn.saytime.bean.User;
import cn.saytime.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController; import java.util.List; /**
* @ClassName cn.saytime.web.UserController
* @Description
* @date 2017-07-04 22:46:14
*/
@RestController
public class UserController { @Autowired
private UserService userService; /**
* 根据ID查询用户
* @param id
* @return
*/
@RequestMapping(value = "user/{id}", method = RequestMethod.GET)
public ResponseEntity<JsonResult> getUserById (@PathVariable(value = "id") Integer id){
JsonResult r = new JsonResult();
try {
User user = userService.getUserById(id);
r.setResult(user);
r.setStatus("ok");
} catch (Exception e) {
r.setResult(e.getClass().getName() + ":" + e.getMessage());
r.setStatus("error");
e.printStackTrace();
}
return ResponseEntity.ok(r);
} /**
* 查询用户列表
* @return
*/
@RequestMapping(value = "users", method = RequestMethod.GET)
public ResponseEntity<JsonResult> getUserList (){
JsonResult r = new JsonResult();
try {
List<User> users = userService.getUserList();
r.setResult(users);
r.setStatus("ok");
} catch (Exception e) {
r.setResult(e.getClass().getName() + ":" + e.getMessage());
r.setStatus("error");
e.printStackTrace();
}
return ResponseEntity.ok(r);
} /**
* 添加用户
* @param user
* @return
*/
@RequestMapping(value = "user", method = RequestMethod.POST)
public ResponseEntity<JsonResult> add (@RequestBody User user){
JsonResult r = new JsonResult();
try {
int orderId = userService.add(user);
if (orderId < 0) {
r.setResult(orderId);
r.setStatus("fail");
} else {
r.setResult(orderId);
r.setStatus("ok");
}
} catch (Exception e) {
r.setResult(e.getClass().getName() + ":" + e.getMessage());
r.setStatus("error"); e.printStackTrace();
}
return ResponseEntity.ok(r);
} /**
* 根据id删除用户
* @param id
* @return
*/
@RequestMapping(value = "user/{id}", method = RequestMethod.DELETE)
public ResponseEntity<JsonResult> delete (@PathVariable(value = "id") Integer id){
JsonResult r = new JsonResult();
try {
int ret = userService.delete(id);
if (ret < 0) {
r.setResult(ret);
r.setStatus("fail");
} else {
r.setResult(ret);
r.setStatus("ok");
}
} catch (Exception e) {
r.setResult(e.getClass().getName() + ":" + e.getMessage());
r.setStatus("error"); e.printStackTrace();
}
return ResponseEntity.ok(r);
} /**
* 根据id修改用户信息
* @param user
* @return
*/
@RequestMapping(value = "user/{id}", method = RequestMethod.PUT)
public ResponseEntity<JsonResult> update (@PathVariable("id") Integer id, @RequestBody User user){
JsonResult r = new JsonResult();
try {
int ret = userService.update(id, user);
if (ret < 0) {
r.setResult(ret);
r.setStatus("fail");
} else {
r.setResult(ret);
r.setStatus("ok");
}
} catch (Exception e) {
r.setResult(e.getClass().getName() + ":" + e.getMessage());
r.setStatus("error"); e.printStackTrace();
}
return ResponseEntity.ok(r);
} }
Application.java package cn.saytime; import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication
@MapperScan("cn.saytime.mapper")
public class SpringbootMybaitsApplication { public static void main(String[] args) {
SpringApplication.run(SpringbootMybaitsApplication.class, args);
}
测试:
使用PostMan通过测试: http://localhost:8080/user/1
2.配置文件版
加入配置文件

代码部分,相比于上面那种方式,改变的只有配置文件以及下面几个部分UserMapper.class
package cn.saytime.mapper; import cn.saytime.bean.User;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.springframework.stereotype.Repository; import java.util.List; /**
* @ClassName cn.saytime.mapper.UesrMapper
* @Description
*/
@Repository
public interface UserMapper { User getUserById(Integer id); public List<User> getUserList(); public int add(User user); public int update(@Param("id") Integer id, @Param("user") User user); public int delete(Integer id); } UserServiceImpl类:
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.demo.dao.UserDao;
import com.demo.mapper.User;
import com.demo.mapper.UserMapper1;
import com.demo.service.UserService;
@Service
public class UserServiceImpl implements UserService{
@Autowired
private UserDao userDao;
@Autowired
private UserMapper1 userMapper;
@Override
public User getUserById(Integer id) {
return userMapper.getUserById(id);
}
@Override
public List<User> getUserList() {
return userMapper.getUserList();
}
}
mybatis-config.xml <?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>
userMapper.xml <?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="cn.saytime.mapper.UserMapper" >
<resultMap id="BaseResultMap" type="cn.saytime.bean.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="getUserList" resultMap="BaseResultMap" >
SELECT
<include refid="Base_Column_List" />
FROM tb_user
</select> <select id="getUserById" parameterType="java.lang.Integer" resultMap="BaseResultMap" >
SELECT
<include refid="Base_Column_List" />
FROM tb_user
WHERE id = #{id}
</select> <insert id="add" parameterType="cn.saytime.bean.User" >
INSERT INTO
tb_user
(username,age,ctm)
VALUES
(#{username}, #{age}, now())
</insert> <update id="update" parameterType="java.util.Map" >
UPDATE
tb_user
SET
username = #{user.username},age = #{user.age}
WHERE
id = #{id}
</update> <delete id="delete" parameterType="java.lang.Integer" >
DELETE FROM
tb_user
WHERE
id = #{id}
</delete>
</mapper>
测试方法同上:http://localhost:8080/user/1
五、简要说明:
不知道大家有没有注意到一点,就是引入Springboot-mybatis依赖的时候,并不是spring官方的starter,往常的springboot集成的依赖,比如web,redis等,groupId以及artifactId的地址如下:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
而这里是mybatis为spring提供的starter依赖,所以依赖地址是:
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.0</version>
</dependency>
而且值得注意的是,这里必须要指定版本号,往常我们使用springboot之所以不需要指定版本号,是因为我们引入的Maven Parent 中指定了SpringBoot的依赖,SpringBoot官方依赖Pom文件中已经指定了它自己集成的第三方依赖的版本号,对于Mybatis,Spring官方并没有提供自己的starter,所以必须跟正常的maven依赖一样,要加版本号。
————————————————
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