【Spring Boot】整合MyBatis

【Spring Boot】整合MyBatis

配置

server:
  port: 9915
# 数据库 相关设置
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://mysql.ycx:3306/ycxdemo?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf8&useSSL=false&autoReConnect=true
    username: root
    password: 123456
    # hikari连接池的参数 相关设置
    hikari:
      # 生效超时
      validationTimeout: 3000
      # 定义获取连接的超时时间。最小250ms,默认30s
      connectionTimeout: 60000
      # 定义连接空闲时间。最小10s,默认10m
      idleTimeout: 60000
      # 定义最小的空闲连接数。推荐不设置。或与最大连接数一致；保持固定的连接数目
      minimumIdle: 10
      # 定义最大的连接数。默认10
      maximumPoolSize: 10
      # 定义连接的最大生命周期。推荐设置该属性。最小30s，默认30m
      maxLifeTime: 60000
      # 从连接池获取到连接后，进行检查的查询语句。推荐设置该属性。默认值为none
      connectionTestQuery: select 1
# MyBatis配置
mybatis:
  # 搜索指定包别名
  type-aliases-package: ycx.mybatis.entity
  # 配置mapper的扫描，找到所有的mapper.xml映射文件
  mapper-locations: classpath*:mapper/*Mapper.xml

起始

package ycx.mybatis;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import ycx.mybatis.entity.Blog;

@MapperScan("ycx.mybatis.mapper")
@SpringBootApplication
public class MybatisDemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(MybatisDemoApplication.class, args);
    }
}

配置扫描映射 @MapperScan("ycx.mybatis.mapper")

实体

package ycx.mybatis.entity;

import lombok.Data;
import org.apache.ibatis.type.Alias;

@Alias("Blog")
@Data
public class Blog {
    private String id;
    private String title;
    private String content;
    public String toString() {
        return "[id=" + id + ",title=" + title + ",content=" + content + "]";
    }
}

映射

package ycx.mybatis.mapper;

import org.springframework.stereotype.Repository;
import ycx.mybatis.entity.Blog;

@Repository
public interface BlogMapper {
//    @Select("select * from Blog where id = #{id}")
    Blog selectBlog(String id);
}

<?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="ycx.mybatis.mapper.BlogMapper">
    <select id="selectBlog" resultType="ycx.mybatis.entity.Blog">
    select * from Blog where id = #{id}
  </select>
</mapper>

控制器

package ycx.mybatis.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import ycx.mybatis.entity.Blog;
import ycx.mybatis.service.BlogService;

@RestController
public class BlogController {
    @Autowired
    BlogService blogService;

    @RequestMapping("/getBlog")
    public Blog getBlog(String id) {
        return blogService.getBlog(id);
    }
}

服务

package ycx.mybatis.service;

import ycx.mybatis.entity.Blog;

public interface BlogService {
    Blog getBlog(String id);
}


package ycx.mybatis.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import ycx.mybatis.entity.Blog;
import ycx.mybatis.mapper.BlogMapper;
import ycx.mybatis.service.BlogService;
@Service
public class BlogServiceImpl implements BlogService {
    @Autowired
    BlogMapper blogMapper;
    @Override
    public Blog getBlog(String id) {
        return blogMapper.selectBlog(id);
    }
}