springboot 集成mybatisplus环境

下载安装IDEA
1. 详情见百度
配置maven
1. 详情见百度
创建springboot-web项目
1. 创建project，选择Spring Initalizr, 选择default

1. 输入组织、项目名称以及基本信息

1. 选择spring Web 以及数据库连接

1. 继续下一步Next，完成创建finish。
2. 启动springApplication，提示。

修改项目jdk版本信息为1.8

1、项目当前jdk信息

2、当前模型的jdk版本信息

3、点击设置，查看当前java编译版本

4、打开pom.xml,修改springboot版本信息，以及java.version信息

5、清除原配置信息，执行启动类

6、继续启动，再次报错，缺少数据源配置信息，修改application.properties文件，填写Oracle驱动信息。

spring.datasource.driver-class-name=oracle.jdbc.OracleDriver
spring.datasource.url=jdbc:oracle:thin:@//XXX.XX.X.XX:1521/XXXX
spring.datasource.username=XXXXXXX
spring.datasource.password=XXXXXXX

提示：当前项目的依赖如下：

<dependency>

    <groupId>org.springframework.boot</groupId>

    <artifactId>spring-boot-starter-jdbc</artifactId>

</dependency>

<dependency>

    <groupId>org.springframework.boot</groupId>

    <artifactId>spring-boot-starter-web</artifactId>

</dependency>



<dependency>

    <groupId>com.oracle.database.jdbc</groupId>

    <artifactId>ojdbc8</artifactId>

    <version>12.2.0.1</version>

</dependency>

<dependency>

    <groupId>org.springframework.boot</groupId>

    <artifactId>spring-boot-starter-tomcat</artifactId>

    <scope>provided</scope>

</dependency>

<dependency>

    <groupId>org.springframework.boot</groupId>

    <artifactId>spring-boot-starter-test</artifactId>

    <scope>test</scope>

</dependency>

7、运行spring启动类，成功启动。

8、编写controller类

MainController.Java

package com.tohi.controller;



import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;



@RestController

public class MainController {

    @RequestMapping({"/selectUser"})

    public String selectUser() {

        return "hello-selectUser";

    }

}

SpringbootMybatisApplication.java

package com.tohi.controller;



import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

import org.springframework.boot.builder.SpringApplicationBuilder;

import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

@SpringBootApplication

public class Application extends SpringBootServletInitializer {

    @Override

    protected SpringApplicationBuilder configure(

            SpringApplicationBuilder application) {

        return application.sources(Application.class);

    }



    public static void main(String[] args) {

        SpringApplication.run(Application.class, args);

    }

}

9.运行启动类，访问 127.0.0.1:8080/selectUser 运行成功

集成mybatis(待更新)
导入mybatis 依赖

<dependency>

    <groupId>com.baomidou</groupId>

    <artifactId>mybatis-plus</artifactId>

    <version>3.5.1</version>

</dependency>

<dependency>

    <groupId>org.projectlombok</groupId>

    <artifactId>lombok</artifactId>

    <version>1.18.4</version>

</dependency>

<dependency>

    <groupId>com.alibaba</groupId>

    <artifactId>fastjson</artifactId>

    <version>1.2.47</version>

</dependency>



<dependency>

    <groupId>com.baomidou</groupId>

    <artifactId>mybatis-plus-boot-starter</artifactId>

    <version>3.0.5</version>

</dependency>

编写mapper.xml

UserMapper.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.tohi.mapper.UserMapper">

         <select id="selectAll" resultType="com.tohi.pojo.User">

            select *  from  maxuser

        </select>

</mapper>

编写实体类、mapper接口

User.java

package com.tohi.pojo;



import lombok.Data;



@Data

public class User {

    private String  personid;

    private String  password;

    private String  status;

    private String  statusdate;



}

UserMapper.java

package com.tohi.mapper;

import com.tohi.pojo.User;

import org.apache.ibatis.annotations.Mapper;

import org.springframework.stereotype.Repository;



import java.util.List;



@Mapper

@Repository

public interface UserMapper  {

    public List<User> selectAll();



}

编写MainController

package com.tohi.controller;



import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.JSONArray;

import com.tohi.mapper.UserMapper;

import com.tohi.pojo.User;


import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;



import java.util.List;



@RestController

public class MainController {



    @Autowired

    private UserMapper mapper;



    @RequestMapping("/selectUser")

    public String selectUser() {



        List<User> users = mapper.selectAll();

        JSONArray array= (JSONArray) JSON.toJSON(users);

        String str=array.toJSONString();

        return str;

    }

}

5、编写SpringbootMybatisApplication.Java

package com.tohi.controller;



import org.mybatis.spring.annotation.MapperScan;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.builder.SpringApplicationBuilder;

import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

import org.springframework.context.annotation.ComponentScan;



@SpringBootApplication

@MapperScan("com.tohi.mapper")

public class SpringbootMybatisApplication  extends SpringBootServletInitializer {

    @Override

    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {

        return application.sources(SpringbootMybatisApplication.class);

    }

    public static void main(String[] args) {

        SpringApplication.run(SpringbootMybatisApplication.class, args);

    }



}

调用，127.0.0.1:8080/selectUser  会输出当前数据库查询的所有记录信息

集成myBatis-plus
在pojo包下面新建Maxuser.java

package com.tohi.pojo;



import lombok.Data;

@Data

public class Maxuser {

        private String  personid;

        private String  password;

        private String  status;

        private String  statusdate;



}

编写UserMapperPlus.java文件，写上mapper注解

package com.tohi.mapper;



import com.baomidou.mybatisplus.core.mapper.BaseMapper;

import com.tohi.pojo.Maxuser;

import org.apache.ibatis.annotations.Mapper;



@Mapper

public interface UserMapperPlus extends BaseMapper<Maxuser> {



}

3、MainController.java中添加方法

@RequestMapping("/selectUser1")

public String selectUser1() {



    List<Maxuser> users = userMapperPlus.selectList(null);

    JSONArray array= (JSONArray) JSON.toJSON(users);

    String str=array.toJSONString();

    return str;

}

4.启动Application,进行访问127.0.0.1:8080/selectUser1 访问成功！！

springboot 集成mybatisplus环境

输入组织、项目名称以及基本信息

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