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SpringBoot示例教程（一）MySQL与Mybatis基础用法

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09/25
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示例需求

在Springboot2框架中，使用Mysql和Mybatis功能：
1. Mysql+Datasource集成
2. Mybatis+XML用法详解

数据库准备

采用了Oracle中的scott用户下的四张表，迁移至MySQL下，详见MySQL中建立Oracle中SCOTT数据示例

创建示例工程

本工程代码采用idea进行构建

1、新建工程

2、 创建工程时，直接勾选所需依赖

3、工程创建完毕后，删除无用文件

4、手动添加额外依赖，配置pom.xml

<?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>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.lock</groupId>
<artifactId>smartmis-scott</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>smartmis-scott</name>
<description>SmartMIS for Scott</description> <properties>
<java.version>1.8</java.version>
</properties> <dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.0.1</version>
</dependency> <dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
<version>5.1.46</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.42</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies> <build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build></project>

注意：手动修改一下mysql驱动的版本，默认版本比较高，应用时可能会有错误；我这里手动指定为5.1.46版本。

5、修改原application.properties为application.yml，并做如下配置

spring:
datasource:
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/scott?useUnicode=true&autoReconnect=true&allowMultiQueries=true&useSSL=false
username: root
password: ****
server:
port: 8686
mybatis:
config-location: classpath:mybatis-config.xml

6、resources目录下新增mybatis-config.xml配置文件

<?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.lock"/>
</typeAliases>
<mappers>
<mapper resource="mybatis/mapper/DeptMapper.xml"/>
<mapper resource="mybatis/mapper/EmpMapper.xml"/>
<mapper resource="mybatis/mapper/SalgradeMapper.xml"/>
<mapper resource="mybatis/mapper/BonusMapper.xml"/>
</mappers>
</configuration>

对应DeptMapper.xml

<?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.lock.smartmis.business.dao.DeptDao"> <select id="getAllDepts" resultType="com.lock.smartmis.business.vo.DeptVo">
select * from dept
</select> <select id="getDeptByNo" resultType="com.lock.smartmis.business.vo.DeptVo">
select * from dept where deptno = #{deptNo}
</select></mapper>

7、建立bo类（以Dept类为例），并以此为基础建立vo类

package com.lock.smartmis.business.bean;import java.io.Serializable;public class Dept implements Serializable { private static final long serialVersionUID = 1L; private long deptNo; private String dName; private String loc; public long getDeptNo() {
return deptNo;
} public void setDeptNo(long deptNo) {
this.deptNo = deptNo;
} public String getdName() {
return dName;
} public void setdName(String dName) {
this.dName = dName;
} public String getLoc() {
return loc;
} public void setLoc(String loc) {
this.loc = loc;
} @Override
public String toString(){
return getDeptNo() + "," + getdName() + "," + getLoc();
}
}

package com.lock.smartmis.business.vo;import com.lock.smartmis.business.bean.Dept;public class DeptVo extends Dept{ private static final long serialVersionUID = 1L;}

8、Dao层接口及其实现

package com.lock.smartmis.business.dao;import com.lock.smartmis.business.vo.DeptVo;import java.util.List;public interface DeptDao { public List<DeptVo> getAllDepts(); public DeptVo getDeptByNo(Long id);
}

package com.lock.smartmis.business.dao.impl;import com.lock.smartmis.business.dao.DeptDao;
import com.lock.smartmis.business.vo.DeptVo;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;import java.util.List;@Component
public class DeptDaoimpl implements DeptDao { @Autowired
public SqlSessionTemplate sqlSessionTemplate; @Override
public List<DeptVo> getAllDepts() {
return this.sqlSessionTemplate.selectList("getAllDepts");
} @Override
public DeptVo getDeptByNo(Long deptNo) {
return this.sqlSessionTemplate.selectOne("getDeptByNo", deptNo);
}
}

9、Service层

package com.lock.smartmis.business.service;import com.lock.smartmis.business.vo.DeptVo;import java.util.List;public interface DeptService { public List<DeptVo> getAllDepts(); public DeptVo getDeptByNo(Long deptNo);
}

package com.lock.smartmis.business.service.impl;import com.lock.smartmis.business.dao.DeptDao;
import com.lock.smartmis.business.service.DeptService;
import com.lock.smartmis.business.vo.DeptVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.util.List;@Service
public class DeptServiceImpl implements DeptService { @Autowired
private DeptDao deptDao; @Override
public List<DeptVo> getAllDepts() {
return this.deptDao.getAllDepts();
} @Override
public DeptVo getDeptByNo(Long deptNo) {
return this.deptDao.getDeptByNo(deptNo);
}
}

10、Controller层

package com.lock.smartmis.business.controller;import com.lock.smartmis.business.service.DeptService;
import com.lock.smartmis.business.util.JsonResult;
import com.lock.smartmis.business.util.ResultCode;
import com.lock.smartmis.business.vo.DeptVo;
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.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.List;@RestController
@RequestMapping("/restapi")
public class ScottController { protected static Logger logger = LoggerFactory.getLogger(ScottController.class); @Autowired
private DeptService deptService; @GetMapping("/test")
public String test() {
return "API接口测试";
} @GetMapping("/depts")
public JsonResult getAllDepts(){
List<DeptVo> list = this.deptService.getAllDepts();
return new JsonResult(ResultCode.SUCCESS, list);
} @GetMapping("/dept/{deptNo}")
public JsonResult getDeptByNo(@PathVariable("deptNo") Long deptNo){
DeptVo deptVo = this.deptService.getDeptByNo(deptNo);
return new JsonResult(ResultCode.SUCCESS, deptVo);
}
}

10、项目运行起来，测试一下接口

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