首先创建项目一个maven项目引入如下依赖

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0

http://maven.apache.org/xsd/maven-4.0.0.xsd">

4.0.0

cn.itchao

itchao-mybatis

0.0.1-SNAPSHOT

jar

org.springframework.boot

spring-boot-starter-parent

2.0.0.RELEASE

org.springframework.boot

spring-boot-starter-web

mysql

mysql-connector-java

org.projectlombok

lombok

org.mybatis.spring.boot

mybatis-spring-boot-starter

1.1.1

tk.mybatis

mapper-spring-boot-starter

1.1.0

com.alibaba

fastjson

1.2.47

项目结构如下图

首先需要定义一个基类接口MyBaseMapper

package cn.itcaho.base;

import tk.mybatis.mapper.common.Mapper;

import tk.mybatis.mapper.common.MySqlMapper;

public interface MyBaseMapper extends Mapper,MySqlMapper{

}

创建表

CREATE TABLE `tb_brand` (

`id` bigint(20) NOT NULL AUTO_INCREMENT,

`name` varchar(255) DEFAULT NULL COMMENT '品牌名称',

`first_char` varchar(1) DEFAULT NULL COMMENT '品牌首字母',

PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=30 DEFAULT CHARSET=utf8;

创建实体对象

package cn.itcaho.pojo;

import lombok.Data;

@Data

public class TbBrand {

private Long id;

private String name;

private String firstChar;

}

创建业务mapper接口

package cn.itcaho.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Mapper;

import org.apache.ibatis.annotations.Select;

import org.springframework.stereotype.Component;

import cn.itcaho.base.MyBaseMapper;

import cn.itcaho.pojo.TbBrand;

@Mapper

@Component

public interface BrandMapper extends MyBaseMapper{

//自己写xml

List getBrandByName(TbBrand brand);

@Select("select id,name,first_char as firstChar from tb_brand")

List getBrandAll();

}

书写业务Service

package cn.itcaho.service;

import java.util.List;

import org.apache.ibatis.annotations.Select;

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

import org.springframework.stereotype.Service;

import cn.itcaho.mapper.BrandMapper;

import cn.itcaho.pojo.TbBrand;

import tk.mybatis.mapper.entity.Example;

import tk.mybatis.mapper.entity.Example.Criteria;

@Service

public class BrandService {

@Autowired

private BrandMapper brandMapper;

//内置通用mapper全量查询

public List findAll(){

return brandMapper.selectAll();

}

//内置通用mapper按条件查询

public List findName(TbBrand brand){

Example example = new Example(TbBrand.class);

Criteria createCriteria = example.createCriteria();

createCriteria.andEqualTo(brand);

return brandMapper.selectByExample(example);

}

//自己书写xml查询

public List getBrandByName(TbBrand brand){

return brandMapper.getBrandByName(brand);

}

//注解查询

public List getBrandAll(){

return brandMapper.getBrandAll();

}

}

在src/main/resouces目录下创建mapper目录用于存放通过xml书写sql的文件

select

id as id,

name as name,

first_char as firstChar

from

tb_brand

where name = #{name}

书写Controller

package cn.itcaho.controller;

import java.util.List;

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

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

import cn.itcaho.pojo.TbBrand;

import cn.itcaho.service.BrandService;

@RestController

@RequestMapping("/brand")

public class BrandController {

@Autowired

private BrandService brandService;

@RequestMapping("/all")

public List findAll(){

return brandService.findAll();

}

@RequestMapping("/getBrandByName")

public List getBrandByName(TbBrand brand){

return brandService.getBrandByName(brand);

}

@RequestMapping("/getBrandAll")

public List getBrandAll(){

return brandService.getBrandAll();

}

}

核心来了，重点application.yml的配置

server:

port: 9000

spring:

datasource:

url: jdbc:mysql://192.168.100.131:3306/itchao-store

username: root

password: root

driver-class-name: com.mysql.jdbc.Driver

mybatis:

type-aliases-package: cn.itchao.pojo

mapper-locations: classpath:mapper/*.xml

configuration:

map-underscore-to-camel-case: true ##开启驼峰

mapper:

mappers: cn.itcaho.base.MyBaseMapper ##扫描基类接口

identity: mysql

logging:

level:

cn:

itchao:

mapper: debug

书写启动类

package cn.itcaho;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public class Application {

public static void main(String[] args) throws Exception {

SpringApplication.run(Application.class, args);

}

}

启动测试

xml方式的接口测试