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SpringBoot实现单表增删改查

项目结构

在这里插入图片描述

配置文件

  1. 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <!-- 所有的spring-boot工程都必须继承spring-boot-starter-parent -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.xiaoge</groupId>
    <artifactId>springboot_mybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot_mybatis</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!-- web工程起步依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- springboot继承的测试起步依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>

        <!-- mybatis起步依赖 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.4</version>
        </dependency>

        <!-- MySQL连接驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!-- 导入lombok依赖, 这样就不用写getter和setter等方法了 -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <!-- maven的插件 -->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

  2. application.properties

    # 数据库连接信息
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=false
spring.datasource.username=root
spring.datasource.password=root

# 配置mybatis信息
# spring集成Mybatis环境
# pojo别名扫描包
mybatis.type-aliases-package=com.xiaoge.pojo
#加载Mybatis映射文件
mybatis.mapper-locations=classpath:mapper/*Mapper.xml

  3. 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.xiaoge.mapper.UserMapper">
    <select id="queryUserList" resultType="user">
        select * from user
    </select>
</mapper>

实现类

  1. User

    package com.xiaoge.pojo;

import lombok.Data;

/**
 * @program: springboot_mybatis
 * @description:
 * @author: Mr.Xiao
 * @create: 2020-05-03 17:57
 **/
@Data
public class User {

    // 主键
    private Long id;
    // 用户名
    private String username;
    // 密码
    private String password;
    // 姓名
    private String name;

}

持久层

  1. UserMapper

    package com.xiaoge.mapper;

import com.xiaoge.pojo.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

/**
 * @program: springboot_mybatis
 * @description:
 * @author: Mr.Xiao
 * @create: 2020-05-03 18:00
 **/
@Mapper
public interface UserMapper {

    public List<User> queryUserList();

}

业务层

  1. UserService接口

    package com.xiaoge.service;

import com.xiaoge.pojo.User;

import java.util.List;

/**
 * @program: springboot_mybatis
 * @description:
 * @author: Mr.Xiao
 * @create: 2020-05-03 18:56
 **/
public interface UserService {

    public List<User> queryUserList();

}

  2. UserServiceImpl实现类

    package com.xiaoge.service.impl;

import com.xiaoge.mapper.UserMapper;
import com.xiaoge.pojo.User;
import com.xiaoge.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @program: springboot_mybatis
 * @description:
 * @author: Mr.Xiao
 * @create: 2020-05-03 18:56
 **/
@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

    @Override
    public List<User> queryUserList() {
        return userMapper.queryUserList();
    }
}

表现层

  1. MybatisController

    package com.xiaoge.controller;

import com.xiaoge.mapper.UserMapper;
import com.xiaoge.pojo.User;
import com.xiaoge.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * @program: springboot_mybatis
 * @description:
 * @author: Mr.Xiao
 * @create: 2020-05-03 18:54
 **/
@RestController
public class MybatisController {

    @Autowired
    private UserService UserService;

    @GetMapping("/query")
    public List<User> queryUserList(){
        List<User> users = UserService.queryUserList();
        return users;
    }

}

引导类

  1. SpringbootMybatisApplication

    package com.xiaoge;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringbootMybatisApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootMybatisApplication.class, args);
    }

}

测试

  1. MybatisTest

    package com.xiaoge;

import com.xiaoge.mapper.UserMapper;
import com.xiaoge.pojo.User;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.List;

/**
 * @program: springboot_mybatis
 * @description:
 * @author: Mr.Xiao
 * @create: 2020-05-03 19:09
 **/
@RunWith(SpringRunner.class)
@SpringBootTest(classes = SpringbootMybatisApplication.class) // 指定引导类的class字节码
public class MybatisTest {

    @Autowired
    private UserMapper userMapper;

    @Test
    public void test() {
        List<User> users = userMapper.queryUserList();
        System.out.println(users);
    }

}
posted on 2020-05-04 19:30  gmlgxx  阅读(71)  评论(0)    收藏  举报
 
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