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
~