这篇文章主要讲解Springboot整合Mybatis实现一个最基本的增删改查功能，整合的方式有两种一种是注解形式的。
第一步：数据库新建Person表
SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for person
-- ----------------------------
DROP TABLE IF EXISTS `person`;
CREATE TABLE `person` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
`age` int(11) DEFAULT NULL,
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
SET FOREIGN_KEY_CHECKS = 1;这个表结构三个字段id、name、age，以id为主键且递增。
第二步：新建Springboot项目（版本供参考）
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.12.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>最终的目录结构：
第三步：导入相关依赖
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.1</version>
</dependency>第四步：更改application配置文件（配置自己的地址和密码，扫描的包）
#服务启动端口配置
server.port=80
#数据库连接信息配置
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2b8&useSSL=false
#用户名
spring.datasource.username=root
#密码
spring.datasource.password=123456
#驱动
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
mybatis.type-aliases-package=com.minos.onestepdemo01.dao;第五步：新建dao包，在dao包下新建Person类
package com.minos.onestepdemo01.dao;
public class Person {
private Integer id;
private String name;
private Integer age;
public Person() {
}
public Person(Integer id, String name, Integer age) {
this.id = id;
this.name = name;
this.age = age;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "Person{" +
"id=" + id +
", name='" + name + '\'' +
", age=" + age +
'}';
}
}
这个类和数据库中的Person类一一对应的。
第六步：新建mapper包，在mapper新建PersonMapper类
package com.minos.onestepdemo01.mapper;
import com.minos.onestepdemo01.dao.Person;
import org.apache.ibatis.annotations.*;
import java.util.List;
@Mapper
public interface PersonMapper {
// 增加一个Person
@Insert("insert into person(id,name,age)values(#{id},#{name},#{age})")
int insert(Person person);
// 删除一个Person
@Delete("delete from person where id=#{id}")
int deleteByPrimaryKey(Integer id);
// 更改一个Person
@Update("update person set name=#{name},age=#{age} where id=#{id}")
int updateByPrimaryKey(Person person);
// 查询一个Person
@Select("select id,name,age from person where id=#{id}")
Person selectByPrimaryKey(Integer id);
// 查询所有Person
@Select("select id,name,age from person")
List<Person> selectAllPerson();
}
第七步：新建service包，在service包创建PersonService接口
package com.minos.onestepdemo01.service;
import com.minos.onestepdemo01.dao.Person;
import java.util.List;
public interface PersonService {
// 增加一个Person
int insertPerson(Person person);
// 删除一个Person
int deleteByPersonId(Integer id);
// 更改一个Person
int updateByPersonId(Person person);
// 查询一个Person
Person selectByPersonId(Integer id);
// 查询所有的Person
List<Person> selectAllPerson();
}
第八步：在service包下创建PersonServiceImpl接口实现类
package com.minos.onestepdemo01.service;
import com.minos.onestepdemo01.dao.Person;
import com.minos.onestepdemo01.mapper.PersonMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class PersonServiceImpl implements PersonService{
@Autowired
private PersonMapper personMapper;
@Override
public int insertPerson(Person person) {
return personMapper.insert(person);
}
@Override
public int deleteByPersonId(Integer id) {
return personMapper.deleteByPrimaryKey(id);
}
@Override
public int updateByPersonId(Person person) {
return personMapper.updateByPrimaryKey(person);
}
@Override
public Person selectByPersonId(Integer id) {
return personMapper.selectByPrimaryKey(id);
}
@Override
public List<Person> selectAllPerson() {
return personMapper.selectAllPerson();
}
}
第九步：编写controller层
package com.minos.onestepdemo01.controller;
import com.minos.onestepdemo01.dao.Person;
import com.minos.onestepdemo01.service.PersonService;
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.RestController;
import java.util.List;
@RestController
public class PersonController {
@Autowired
private PersonService personService;
@RequestMapping(value = "/add")
public String students(){
Person person=new Person();
person.setId(1);
person.setName("java");
person.setAge(18);
int result=personService.insertPerson(person);
System.out.println("插入的结果是"+result);
return result+"";
}
@GetMapping("/findAll")
public String findall(){
return personService.selectAllPerson().toString()+"";
}
}
第十步：在启动类添加扫描器
package com.minos.onestepdemo01;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.minos.onestepdemo01.mapper")
public class Onestepdemo01Application {
public static void main(String[] args) {
SpringApplication.run(Onestepdemo01Application.class, args);
}
}第十一步：测试
在浏览器输入相应的路径即可。
1
不要重复加载add（如果修改了PersonController内person.setId(数字);内的数字可以），数据表中的id是主键，第二次加载
Whitelabel Error Page
[Person{id=1, name='java', age=18}]