SpringBoot整合Mybatis快速开发项目
1.创建springboot项目，file->project->
之后确定groupid等一路next即可，选择自己需要添加的依赖!
pom文件如下
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!--jdbc -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!-- mysql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- mysql-connector -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--loombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</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-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
2.创建项目结构
controller：自己要在浏览器里面输入路径，要访问的url
pojo:实体类
mapper:要对实体类进行操作的接口文件
service:对接口里面内容的具体实现，业务逻辑层在该层实现
注意：所有的内容都必须在主类外面，项目启动之后会扫面该包下的内容
resources下面创建mapper,里面存放对数据库操作的sql内容
推荐使用官方推荐使用的yaml文件配置数据源和mybatis存放位置等内容
2 编写代码步骤
实体类：
person：
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.util.Date;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Person {
Integer id;
String name;
int age;
Date birth;
}
使用lombok可以省略手动配置getter和setter方法，以及有参和无参构造方法
PersonMapper：接口
import com.yzj.pojo.Person;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface PersonMapper {
//根据id进行查询
Person findById(Integer id);
//查询所有
List<Person> findAll();
//添加
void addPerson(Person person);
//删除
void delById(Integer id);
//修改
void updatePerson(Person person);
}
PersonService:接口实现类，业务层逻辑内容
@Service
@Repository
public class PersonService {
@Autowired
PersonMapper personMapper;
//查询根据id
public Person findById(Integer id){
return personMapper.findById(id);
}
//查询所有
public List<Person> findAll(){
return personMapper.findAll();
}
//添加
public void addPerson(Person person){
personMapper.addPerson(person);
}
//删除根据id
public void delById(Integer id){
personMapper.delById(id);
}
//修改
public void updateperson(Person person){
personMapper.updatePerson(person);
}
}
PersonController:逻辑视图层
import com.yzj.pojo.Person;
import com.yzj.service.PersonService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.Date;
import java.util.List;
@RestController
@RequestMapping("/test")
public class PersonController {
@Autowired
public PersonService personService;
@GetMapping("person/{id}")
public String findBy(@PathVariable Integer id){
System.out.println(personService.findById(id));
return personService.findById(id).toString();
}
@GetMapping("person")
public List<Person> findAll(){
return personService.findAll();
}
@GetMapping("person/add")
public List<Person> addPerson(){
Person person = new Person();
person.setAge(30);
person.setBirth(new Date());
person.setName("Demo");
person.setId(3);
personService.addPerson(person);
return personService.findAll();
}
@GetMapping("person/del/{id}")
public List<Person> delPerson(@PathVariable Integer id){
personService.delById(id);
return personService.findAll();
}
@GetMapping("person/update")
public List<Person> updatePer(){
Person person = new Person(3,"Demo",18,new Date());
personService.updateperson(person);
System.out.println(personService.findAll());
return personService.findAll();
}
}
3.mapper.xml：该文件下写crud sql语句
<?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.yzj.mapper.PersonMapper">
<resultMap id="BaseResultMap" type="com.yzj.pojo.Person">
<result column="id" jdbcType="INTEGER" property="id" />
<result column="name" jdbcType="VARCHAR" property="name" />
<result column="age" jdbcType="INTEGER" property="age" />
<result column="birth" jdbcType="TIMESTAMP" property="birth" />
</resultMap>
<select id="findById" resultType="com.yzj.pojo.Person">
select * from person where id = #{id}
</select>
<select id="findAll" resultType="com.yzj.pojo.Person">
select * from person
</select>
<insert id="addPerson" >
insert into person values (#{id},#{name},#{age},#{birth})
</insert>
<delete id="delById" >
delete from person
where id = #{id}
</delete>
<update id="updatePerson" >
update person
set name = #{name},age=#{age},birth=#{birth}
where id = #{id}
</update>
</mapper>
4.yaml文件
server:
port: 8080
spring:
datasource:
username: root
password: root
url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
driver-class-name: com.mysql.jdbc.Driver
mybatis:
mapper-locations: classpath:mapper/*Mapping.xml
# type-aliases-package: com.yzj.pojo
5项目整体框架
