• SpringBoot示例教程(一)MySQL与Mybatis基础用法


    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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  • 原文地址:https://www.cnblogs.com/hans_gis/p/11127180.html
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