需求背景
在Springboot2框架中,使用Mysql和Mybatis功能:
1. Mysql+Datasource集成
2. Mybatis+XML用法详解
技术点
主要使用了两个包组件
1. mysql-connector-java,Mysql数据库集成包
2. mybatis-spring-boot-starter,Mybatis集成包
3. 数据库初始化init.sql脚本内容(或Docker安装MySQL数据库)
drop table city;
CREATE TABLE `city` (
`id` int(11) NOT NULL primary key,
`name` varchar(32) DEFAULT NULL,
`state` varchar(32) DEFAULT NULL,
`country` varchar(32) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `city` (`id`, `name`, `state`, `country`)
VALUES
(1, '广州16', 'GZ16', 'CH16'),
(2, '北京17', 'BJ17', 'CH17'),
(3, '深圳18', 'SZ18', 'CH18');
代码演示
1. 引入包,配置pom.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.md</groupId>
<artifactId>spring-boot2-parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<artifactId>spring-boot2-mysql-mybatis-xml</artifactId>
<packaging>jar</packaging>
<name>spring-boot2-mysql-mybatis-xml</name>
<description>Spring Boot, MVC, Rest API for App</description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<!-- 构建成可运行的Web项目 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- Mysql数据库集成 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- Mybatis集成 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib-ext-spring</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
2. 配置application.yml
spring:
datasource:
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://192.168.1.101:3306/cfdb?useUnicode=true&autoReconnect=true&allowMultiQueries=true&useSSL=false
username: root
password: 123456
server:
port: 9090
mybatis:
config-location: classpath:mybatis-config.xml
3. 配置mybatis-config.xml
<?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>
<typeAliases>
<package name="com.md"/>
</typeAliases>
<mappers>
<mapper resource="mybatis/mapper/CityMapper.xml"/>
</mappers>
</configuration>
4. 编写VO类
package com.md.demo.bo;
import java.io.Serializable;
public class City implements Serializable {
private static final long serialVersionUID = 1L;
private Long id;
private String name;
private String state;
private String country;
public Long getId() {
return this.id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public String getState() {
return this.state;
}
public void setState(String state) {
this.state = state;
}
public String getCountry() {
return this.country;
}
public void setCountry(String country) {
this.country = country;
}
@Override
public String toString() {
return getId() + "," + getName() + "," + getState() + "," + getCountry();
}
}
5. 编写Dao层
接口
package com.md.demo.dao;
import java.util.List;
import com.md.demo.vo.CityVo;
public interface CityDao {
public List<CityVo> listCities();
public CityVo getCityById(Long id);
}
实现类
package com.md.demo.dao.impl;
import java.util.List;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import com.md.demo.dao.CityDao;
import com.md.demo.vo.CityVo;
@Component
public class CityDaoImpl implements CityDao {
@Autowired
public SqlSessionTemplate sqlSessionTemplate;
@Override
public List<CityVo> listCities() {
return this.sqlSessionTemplate.selectList("listCities");
}
@Override
public CityVo getCityById(Long id) {
return this.sqlSessionTemplate.selectOne("getCityById", id);
}
}
6. 编写Service层
接口
package com.md.demo.service;
import java.util.List;
import com.md.demo.vo.CityVo;
public interface CityService {
public List<CityVo> listCities();
public CityVo getCityById(Long id);
}
实现类
package com.md.demo.service.impl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.md.demo.dao.CityDao;
import com.md.demo.service.CityService;
import com.md.demo.vo.CityVo;
@Service
public class CityServiceImpl implements CityService {
@Autowired
private CityDao cityDao;
/**
* 获得城市列表
*/
@Override
public List<CityVo> listCities() {
return this.cityDao.listCities();
}
/**
* 根据id,获得某个城市
*/
@Override
public CityVo getCityById(Long id) {
return this.cityDao.getCityById(id);
}
}
7. 编写接口访问层
package com.md.demo.rest;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import com.md.demo.service.CityService;
import com.md.demo.util.JsonResult;
import com.md.demo.util.ResultCode;
import com.md.demo.vo.CityVo;
/**
* @author Minbo
*/
@RestController
public class InitRest {
protected static Logger logger = LoggerFactory.getLogger(InitRest.class);
@Autowired
private CityService cityService;
/**
* http://localhost:9090/hello
*
* @return
*/
@GetMapping("/hello")
public String hello() {
return "Hello greetings from spring-boot2-mysql-mybatis-xml";
}
/**
* http://localhost:9090/listCities
*
* @return
*/
@GetMapping("/listCities")
public JsonResult listCities() {
List<CityVo> list = this.cityService.listCities();
return new JsonResult(ResultCode.SUCCESS, list);
}
/**
* http://localhost:9090/getCityById?id=1
*
* @return
*/
@GetMapping("/getCityById")
public JsonResult listCities(Long id) {
CityVo obj = this.cityService.getCityById(id);
return new JsonResult(ResultCode.SUCCESS, obj);
}
}
完整源码下载
https://github.com/hemin1003/spring-boot-study/tree/master/spring-boot2-study/spring-boot2-parent
官方资料
附加说明
建议1:在实际项目中,建议使用Mybatis+XML文件方式,而不建议使用Annotation方式
Annotation使用方式如下:
XML使用方式如下:
原因:因为使用了XML方式,可以在xml文件直接复制sql,从而评估sql的性能等(如果有专门的dba的话),而不需要在代码中查找,便捷高效
该系列教程
至此,全部介绍就结束了
------------------------------------------------------
------------------------------------------------------
关于我(个人域名)
期望和大家一起学习,一起成长,共勉,O(∩_∩)O谢谢
欢迎交流问题,可加个人QQ 469580884,
或者,加我的群号 751925591,一起探讨交流问题
不讲虚的,只做实干家
Talk is cheap,show me the code
如果觉得内容赞,您可以请我喝杯咖啡: