SpringBoot------整合MyBatis

1.添加pom.xml需要的依赖

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>top.ytheng</groupId>
  <artifactId>springboot-demo</artifactId>
  <version>0.0.1</version>
  <packaging>jar</packaging>
  
  <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <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>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        
        <!-- 热部署 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
              <scope>true</scope>
        </dependency>
        
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
            <scope>runtime</scope>
        </dependency>
        
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.6</version>
        </dependency>
    </dependencies>

    <build>
        <!-- 打包的名称 -->
        <finalName>myspringboot</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

2.添加Entity

package top.ytheng.demo.entity;

import org.springframework.stereotype.Component;
import java.lang.String;
import java.util.Date;

public class UserInfo {
    private int id;
    private String username;
    private String password;
    private Date createTime;
    
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public Date getCreateTime() {
        return createTime;
    }
    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }
    public UserInfo() {
        super();
    }
    public UserInfo(String username, String password) {
        super();
        this.username = username;
        this.password = password;
    }
}

3.添加UserMapper.java

package top.ytheng.demo.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Options;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import top.ytheng.demo.entity.UserInfo;

public interface UserMapper {

    //#{}里面的名称要和UserInfo里面的一一对应
    //推荐使用#{},不要使用${},会存在注入风险
    @Insert("Insert INTO user_info(username,password) VALUES(#{username},#{password})")
    //保存对象，获取数据库自增id
    //keyProperty对应UserInfo对象中的id
    //keyColumn对应数据库user_info表中的id
    @Options(useGeneratedKeys=true, keyProperty="id", keyColumn="id")
    int insert(UserInfo user);
    
    //查找全部
    @Select("SELECT * FROM user_info")
    @Results({
        @Result(column="create_time", property="createTime"),
        //@Result(column="update_time", property="updateTime"),
    })
    List<UserInfo> getAll();
    
    //根据id找对象
    @Select("SELECT * FROM user_info WHERE id = #{id}")
    @Results({
        @Result(column="create_time", property="createTime"),
    })
    UserInfo findById(int id);
    
    //更新对象
    @Update("UPDATE user_info SET username= #{username} WHERE id = #{id}")
    void update(UserInfo user);
    
    //删除对象
    @Delete("DELETE FROM user_info WHERE id = #{userid}")
    void delete(int userid);
}

4.添加UserService.java

package top.ytheng.demo.service;

import java.util.List;

import top.ytheng.demo.entity.UserInfo;

public interface UserService {

    public int add(UserInfo user);
    
    public List<UserInfo> getAll();
    
    public UserInfo findById(int id);
    
    public void update(UserInfo user);
    
    public void delete(int id);
}

5.添加UserServiceImpl.java

package top.ytheng.demo.service.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import top.ytheng.demo.entity.UserInfo;
import top.ytheng.demo.mapper.UserMapper;
import top.ytheng.demo.service.UserService;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;
    
    @Override
    public int add(UserInfo user) {
        // TODO Auto-generated method stub
        userMapper.insert(user);
        int id = user.getId();
        return id;
    }

    @Override
    public List<UserInfo> getAll() {
        // TODO Auto-generated method stub
        List<UserInfo> users = userMapper.getAll();
        return users;
    }

    @Override
    public UserInfo findById(int id) {
        // TODO Auto-generated method stub
        UserInfo user = userMapper.findById(id);
        return user;
    }

    @Override
    public void update(UserInfo user) {
        // TODO Auto-generated method stub
        userMapper.update(user);
    }

    @Override
    public void delete(int id) {
        // TODO Auto-generated method stub
        userMapper.delete(id);
    }
}

6.添加Controller

package top.ytheng.demo.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import top.ytheng.demo.entity.UserInfo;
import top.ytheng.demo.service.UserService;

@RestController
@RequestMapping("/api/v1/user")
public class UserController {

    @Autowired
    private UserService userService;
    
    @GetMapping("/add")
    public Object add() {
        UserInfo user = new UserInfo();
        user.setUsername("theng");
        user.setPassword("123456");
        int id = userService.add(user);
        return id;
    }
    
    @GetMapping("/getall")
    public Object getAll() {
        List<UserInfo> users = userService.getAll();
        return users;
    }
    
    @GetMapping("/findbyid")
    public Object findById(@RequestParam(name="id")int id) {
        UserInfo user = userService.findById(id);
        return user;
    }
    
    @GetMapping("/update")
    public Object update() {
        UserInfo user = userService.findById(2);
        user.setUsername("朱竹清");
        userService.update(user);
        return "update success";
    }
    
    @GetMapping("/delete")
    public Object delete(@RequestParam(name="id")int id) {
        userService.delete(id);
        return "delete success";
    }
}

7.添加配置文件application.properties

#端口号
server.port=8080

#数据库的一些配置
#mybatis.type-aliases-package=top.ytheng.demo
#会自动识别
#spring.datasource.driver-class-name=com.mysql.jdbc.Driver
#数据库连接
spring.datasource.url=jdbc:mysql://localhost:3306/shop?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=123456
#使用阿里巴巴数据源，默认的数据源(com.zaxxer.hikari.KikariDataSource)
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
#开启控制台打印sql
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl

8.添加启动类

package top.ytheng.demo;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;

@SpringBootApplication //等于下面3个
//@SpringBootConfiguration
//@EnableAutoConfiguration
//@ComponentScan
//拦截器用到
@ServletComponentScan
//MyBatis用到
@MapperScan("top.ytheng.demo.mapper")
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

9.安装MySQL数据库，添加数据库shop，表user_info

10.右键项目Run As启动，访问url

http://localhost:8080/api/v1/user/getall
http://localhost:8080/api/v1/user/add
http://localhost:8080/api/v1/user/findbyid?id=1
http://localhost:8080/api/v1/user/update
http://localhost:8080/api/v1/user/delete?id=10

另附：