Spring Boot + Spring MVC +MyBatis 整合 简单的CRUD操作

项目整体目录结构
项目结构图
项目创建请查看https://blog.youkuaiyun.com/Tom_kobe/article/details/109741437

pom.xml配置

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.edu</groupId>
    <artifactId>spring-boot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-boot</name>
    <description>Demo project for Spring Boot</description>

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

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--导入配置文件处理器,配置文件进行绑定就会有提示-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
         <!-- jpa-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
         <!-- MySQL-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>
        <!-- druid数据库连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>
        <!-- mybatis启动器 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!-- thymeleaf -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

    </dependencies>

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

</project>

该项目中出现application.properties和application.yml,两者都属于配置文件根据的自己的喜好选择相应的格式
application.properties

#上下文配置
server.port=8080
server.servlet.context-path=/springboot

#MySQL Configuration:
spring.datasource.driverClassName=com.mysql.jdbc.Driver

spring.datasource.url=jdbc:mysql://localhost:3306/students?characterEncoding=utf8

spring.datasource.username=root

spring.datasource.password=123456

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

#JPA Configuration:

spring.jpa.database=MySQL

spring.jpa.show-sql=true

spring.jpa.generate-ddl=true

spring.jpa.hibernate.ddl-auto=update

spring.jpa.hibernate.naming_strategy=org.hibernate.cfg.ImprovedNamingStrategy

#Mybatis
mybatis.mapper-locations= classpath:mapper/*Mapper.xml
mybatis.type-aliases-package=com.edu.springboot.bean
mybatis.configuration.map-underscore-to-camel-case=true

application.yml

server:
  port: 8080
  servlet:
    context-path: /springboot
---
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/test?characterEncoding=utf8
    username: root
    password: 123456
    type: com.alibaba.druid.pool.DruidDataSource
  jpa:
    database: mysql
    show-sql: true
    #Hibernate ddl auto (validate|create|create-drop|update)
    hibernate:
      ddl-auto: update
      naming-strategy: org.hibernate.cfg.ImprovedNamingStrategy
    properties:
      hibernate:
        dialect: org.hibernate.dialect.MySQL5Dialect

---

mybatis:
  mapper-locations: classpath:mapper/*Mapper.xml
  type-aliases-package: com.edu.springboot.bean
  configuration.map-underscore-to-camel-case: true

数据库结构
在这里插入图片描述
创建Students实体bean

package com.edu.springboot.bean;

import org.springframework.format.annotation.DateTimeFormat;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity //Entity注解表明该类为实体类
@Table(name = "students") //对应数据库的表名
public class Students {

    @Id //数据库id
    private int id;
    private String name;
    private String address;
    private int age;
    @DateTimeFormat(pattern = "yyyy-MM-dd") //转换时间格式
    private String birthday;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getBirthday() {
        return birthday;
    }

    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }
}

创建StudentMapper接口
此项目中注解和映射都有用到

package com.edu.springboot.mapper;

import com.edu.springboot.bean.Students;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;

import java.util.List;

public interface StudentMapper {
    @Select("select * from students")
    List<Students> getAll();

    @Select("select * from students where id = #{id}")
    Students getById(int id);

    @Delete("delete from students where id = #{id}")
    int delete(int id);

    int update(Students students);

//    @Insert("insert into students(name,address,age) value (#{name},#{address},#{age})")
    int insert(Students students);
}

StudentMapper.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.edu.springboot.mapper.StudentMapper">
    <update id="update" parameterType="com.edu.springboot.bean.Students">
        update students
        <set>
            <if test="name != null">
                name = #{name},
            </if>
            <if test="address != null">
                address = #{address},
            </if>
            <if test="age != null">
                age = #{age},
            </if>
            <if test="birthday != null">
                birthday = #{birthday},
            </if>
        </set>
        where id = #{id}
    </update>

    <insert id="insert" parameterType="com.edu.springboot.bean.Students">
        insert into students
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="name != null">
                name,
            </if>
            <if test="address != null">
                address,
            </if>
            <if test="age != null">
                age,
            </if>
            <if test="birthday != null">
                birthday,
            </if>
        </trim>
        <trim prefix="values (" suffix=")" suffixOverrides=",">
            <if test="name != null">
                #{name},
            </if>
            <if test="address != null">
                #{address},
            </if>
            <if test="age != null">
                #{age},
            </if>
            <if test="birthday != null">
                #{birthday},
            </if>
        </trim>
    </insert>
</mapper>

创建StudentService接口

package com.edu.springboot.service;

import com.edu.springboot.bean.Students;

import java.util.List;

public interface StudentService {
    List<Students> getAll();

    Students getById(int id);

    int update(Students students);

    int delete(int id);

    int insert(Students students);
}

创建StudentServiceImpl实现类

package com.edu.springboot.service.impl;

import com.edu.springboot.bean.Students;
import com.edu.springboot.mapper.StudentMapper;
import com.edu.springboot.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class StudentServiceImpl implements StudentService {
    @Autowired
    private StudentMapper studentMapper;

    @Override
    public List<Students> getAll() {
        return studentMapper.getAll();
    }

    @Override
    public Students getById(int id) {
        return studentMapper.getById(id);
    }

    @Override
    public int update(Students students) {
        int i = studentMapper.update(students);
        return i;
    }

    @Override
    public int insert(Students students) {
        int i = studentMapper.insert(students);
        return i;
    }

    @Override
    public int delete(int id) {
        int i = studentMapper.delete(id);
        return i;
    }
}

创建StudentController控制器

package com.edu.springboot.controller;

import com.edu.springboot.bean.Students;
import com.edu.springboot.service.StudentService;
import com.edu.springboot.util.Message;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController //RestController是@RequestBody和@Controller组合在一起的
@RequestMapping("/student")
public class StudentController {

    @Autowired
    private StudentService studentService;

    @RequestMapping("/list")
    private List<Students> list(){
        List<Students> students = studentService.getAll();
        return students;
    }

    @RequestMapping("/edit")
    private Students getById(int id){
        return studentService.getById(id);
    }

    @RequestMapping(value = "update" ,method = RequestMethod.POST)
    private Message update(Students students){
        int i = studentService.update(students);
        if (i == 1){
            return Message.success();
        }else {
            return Message.fail();
        }
    }

    @RequestMapping(value = "insert" ,method = RequestMethod.POST)
    private Message insert(Students students){
        int i = studentService.insert(students);
        if (i == 1){
            return Message.success();
        }else {
            return Message.fail();
        }
    }
    @RequestMapping("/del")
    private Message del(int id){
        int i = studentService.delete(id);
        if (i == 1){
            return Message.success();
        }else {
            return Message.fail();
        }
    }
}

创建Message类
因为本项目没有写前端显示页面,所以就自己封装了一个Message类,根据返回的状态码观察操作是否成功。

package com.edu.springboot.util;

import java.util.HashMap;
import java.util.Map;

public class Message {
	private Integer code;//响应状态码,约定200成功,失败500
	private String msg;//代表响应信息
	private Map<String, Object> info=new HashMap<>();
	public static Message success() {
		Message message=new Message();
		message.setCode(200);
		message.setMsg("成功");
		return message;
	}
	public static Message fail() {
		Message message=new Message();
		message.setCode(500);
		message.setMsg("失败");
		return message;
	}
	public Message addInfo(String key,Object value) {
		getInfo().put(key, value);
		return this;
	}
	public Integer getCode() {
		return code;
	}
	public void setCode(Integer code) {
		this.code = code;
	}
	public String getMsg() {
		return msg;
	}
	public void setMsg(String msg) {
		this.msg = msg;
	}
	public Map<String, Object> getInfo() {
		return info;
	}
	public void setInfo(Map<String, Object> info) {
		this.info = info;
	}
	
}

查询所有的运行结果
在这里插入图片描述
条件查询(此项目根据ID查询)
在这里插入图片描述

删除的运行成功结果
在这里插入图片描述
删除的运行失败结果
在这里插入图片描述
新增运行结果
在这里插入图片描述
修改运行失败结果
在这里插入图片描述
修改运行成功结果
在这里插入图片描述

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