手把手教你用SpringBoot+Mybatis+Oracle实现第一个项目

写在前面：只实现简单增删改查，不使用页面
使用的表为Oracle中Scott用户下的emp表。

一、创建项目

1.选择Spring Initializr(初始化)

2.输入配置信息

可以只填入Group和Artifact，其他默认

3.添加所需模块

方法1. 可以直接在这里进行勾选以下三个模块
Spring Web
MyBatis Framework
OracleDriver
方法2. 创建好项目使用pom.xml添加所需模块
这里为了方便演示使用的方法1

二、调整项目结构

需要添加

com.aaa包下添加
	controller
	dao
	entity
	service
resources文件夹下
	mapper

上图是添加好包的效果。

三、编写application.properties配置文件

# 服务端口信息
server.port=8080
server.address=127.0.0.1
server.session-timeout=60
# 数据库连接信息
spring.datasource.url=jdbc:oracle:thin:@127.0.0.1:1521:orcl
spring.datasource.username=scott
spring.datasource.password=root
spring.datasource.driver-class-name=oracle.jdbc.OracleDriver
#mybatis配置xml文件路径
mybatis.mapper-locations=classpath:mapper/*.xml

配置文件写好后可以进行代码编辑

四、编写CRUD代码

entity实体类

Emp:

package com.aaa.entity;


import java.util.Date;

public class Emp {

  private String empno;
  private String ename;
  private String job;
  private String mgr;
  private Date hiredate;
  private String sal;
  private String comm;
  private String deptno;

//	->Get And Set

  @Override
  public String toString() {
    return "Emp{" +
            "empno='" + empno + '\'' +
            ", ename='" + ename + '\'' +
            ", job='" + job + '\'' +
            ", mgr='" + mgr + '\'' +
            ", hiredate=" + hiredate +
            ", sal='" + sal + '\'' +
            ", comm='" + comm + '\'' +
            ", deptno='" + deptno + '\'' +
            '}';
  }
}

dao层接口：

TestDao:

package com.aaa.dao;

import com.aaa.entity.Emp;
import java.util.List;

public interface TestDao {

    /**
     * 添加方法
     * @param emp
     * @return 添加后的主键id
     */
    int insert(Emp emp);

    /**
     * 修改方法
     * @param emp
     * @return
     */
    int update(Emp emp);

    /**
     * 删除方法
     * @param emp
     * @return
     */
    int delete(Emp emp);

    /**
     * 查询一条数据
     * @param emp
     * @return
     */
    Emp findOne(Emp emp);

    /**
     * 总条数
     * @return
     */
    int count();

    /**
     * 查所有
     * @return
     */
    List<Emp> findAll();

}

Service层

TestService：

package com.aaa.service;

import com.aaa.dao.TestDao;
import com.aaa.entity.Emp;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class TestService {

    @Autowired
    private TestDao testDao;

    public int insert(Emp emp){
        return testDao.insert(emp);
    }

    public int update(Emp emp){
        return testDao.update(emp);
    }

    public int delete(Emp emp){
        return testDao.delete(emp);
    }

    public Emp findOne(Emp emp){
        return testDao.findOne(emp);
    }

    public int count(){
        return testDao.count();
    }

    public List<Emp> findAll(){
        return testDao.findAll();
    }
}

Controller层

TestController：

package com.aaa.controller;

import com.aaa.entity.Emp;
import com.aaa.service.TestService;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.util.List;
import java.util.Map;

@RestController
@EnableAutoConfiguration
public class TestController {

    @Resource
    private TestService svc;

    @RequestMapping("/test")
    public String test(){
        return "success";
    }

    @RequestMapping(value = "/insert",method = RequestMethod.POST)
    public String insert(Emp emp){
        int i = svc.insert(emp);
        return "新增数据的id为："+i;
    }

    @RequestMapping(value = "/findOne",method = RequestMethod.GET)
    public Emp findOne(Emp emp){
        Emp result = svc.findOne(emp);
        return result;
    }

    @RequestMapping(value = "/update",method = RequestMethod.PUT)
    public String update(Emp emp){
        int i = svc.update(emp);
        return "修改的数据为id为"+i;
    }

    @RequestMapping(value = "/delete",method = RequestMethod.DELETE)
    public String delete(Emp emp){
        int i = svc.delete(emp);
        return "删除成功";
    }

    @RequestMapping(value = "/count",method = RequestMethod.GET)
    public int count(){
        return svc.count();
    }

    @RequestMapping(value = "/findAll",method = RequestMethod.GET)
    public List<Emp> findAll(){
        return svc.findAll();
    }
}

启动方法

SpringbootOracleApplication：

package com.aaa;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.aaa.dao")
public class SpringbootOracleApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringbootOracleApplication.class, args);
    }
}

mapper 文件

TestMapper：

<?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.aaa.dao.TestDao">

    <insert id="insert" parameterType="com.aaa.entity.Emp" useGeneratedKeys="true" keyProperty="empno" keyColumn="empno">
        insert into emp (empno, ename) values (#{empno},#{ename})
    </insert>

    <update id="update" parameterType="com.aaa.entity.Emp">
        update emp set ename=#{ename} where empno=#{empno}
    </update>

    <delete id="delete" parameterType="com.aaa.entity.Emp">
        delete from emp where EMPNO=#{empno}
    </delete>

    <select id="findOne" resultType="com.aaa.entity.Emp" parameterType="com.aaa.entity.Emp">
        select * from emp where empno=#{empno}
    </select>

    <select id="count" resultType="java.lang.Integer">
        select count(*) from emp
    </select>

    <select id="findAll" resultType="com.aaa.entity.Emp">
        select * from emp
    </select>
</mapper>