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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