springboot整合mybatis的超详细过程(配置模式+注解模式)

<dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.25</version>
        </dependency>
        <!--mybatis整合springboot起步依赖-->
        <!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.3</version>
        </dependency>

package com.xbfinal.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class ssmdb {
    private Integer id;
    private String name;
    private String type;
    private String description;
}

package com.xbfinal.mapper;

import com.xbfinal.pojo.ssmdb;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import java.util.List;
@Mapper
public interface ssmdbMapper {
    //更具id查对应的书用注解模式
    @Select("select * from tbl_book where id=#{id}")
    public ssmdb getById(int id);
    //查询所有的书 ，这里我们用配置模式
    //配置模式我个人喜欢用来写复制的sql语句（狗头）
    public List<ssmdb> getAll();
}

package com.xbfinal.service;
import com.xbfinal.mapper.ssmdbMapper;
import com.xbfinal.pojo.ssmdb;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class ser {
    @Autowired
    ssmdbMapper ssmdbMapper;
    public ssmdb getById(int id){
        return ssmdbMapper.getById(id);
    }
    public List<ssmdb> getAll(){
        return ssmdbMapper.getAll();
    }
}

package com.xbfinal.controller;
import com.xbfinal.pojo.ssmdb;
import com.xbfinal.service.ser;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
public class controller01 {
    @Autowired
    ser ser;
    @RequestMapping("/id")
    public String to01(){
        
     final ssmdb byId = ser.getById(1);
        return byId.toString();
    }
    @RequestMapping("/all")
    public String to02(){
        // final ssmdb byId = ser.getById(1);
        final List<ssmdb> all = ser.getAll();
        return all.toString();
    }
}

spring:
  datasource:
    password: 0615
    username: root
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/ssm_db?serverTimezone=UTC&characterEncoding=utf8&useUnicode=true&useSSL=false

<?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>
    <!--基本的东西都不用配置，因为springboot配好了-->
</configuration>

<?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.xbfinal.mapper.ssmdbMapper">
    
    <!--public List<ssmdb> getAll();-->
    <select id="getAll" resultType="com.xbfinal.pojo.ssmdb">
        select * from tbl_book
    </select>
</mapper>

mybatis:
  config-location: classpath:static/mybatis/mybatis-config.xml
  mapper-locations: classpath:static/mybatis/mapper/*.xml