【SpringBoot】基于MyBatis-Plus的实体类（Model）搭建

爱因斯坦乐

已于 2025-03-21 11:07:21 修改

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分类专栏： SpringBoot+Vue实现外卖小程序全过程文章标签： spring boot mybatis java

于 2025-03-01 21:11:44 首次发布

本文链接：https://blog.csdn.net/aystl_gss/article/details/145953598

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项目结构

src/main/java
└── com.morningbox
├── config // 配置类
├── controller // 控制器
├── service // 服务层
│ ├── impl // 服务实现类
├── mapper // Mapper接口
├── model // 实体类
├── dto // 数据传输对象
├── exception // 自定义异常
├── utils // 工具类
└── MorningBoxApplication.java // 启动类

src/main/resources
├── application.yml // 配置文件
└── static // 静态资源

添加依赖

<!--        mybatis-plus- -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.3.2</version>
        </dependency>

这是完整的依赖文件为

<?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>
    <groupId>com.example</groupId>
    <artifactId>MorningBoxSpring</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>MorningBoxSpring</name>
    <description>MorningBoxSpring</description>
    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.6.13</spring-boot.version>
    </properties>
    <dependencies>
        <!-- Spring Boot Starter -->
        <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>2.2.2</version>
        </dependency>

        <!-- 数据库 -->
        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!-- 数据校验 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>

        <!-- Redis缓存 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

        <!-- JSON处理 -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
        </dependency>
        <!-- 工具类 -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.11</version>
        </dependency>
        <!--        mybatis-plus- -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.3.2</version>
        </dependency>

        <!-- 测试 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-core</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${spring-boot.version}</version>
                <configuration>
                    <mainClass>com.example.morningboxspring.MorningBoxSpringApplication</mainClass>
                    <skip>true</skip>
                </configuration>
                <executions>
                    <execution>
                        <id>repackage</id>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

使用Mybatis-Plus时，实体类的设计可以更简洁，不需要JPA的注解，但仍然可以使用MyBatis的注解（如@TableName、@TableId、@TableField）

配置类

MyBatisPlusConfig

package config;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * 功能：MyBatisPlusConfig
 * 作者：爱因斯坦乐
 * 日期：2025/3/1
 */
@Configuration
public class MyBatisPlusConfig {
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL)); // 分页插件
        return interceptor;
    }
}

实体类设计

下面以用户表（user）、地址表（address）和订单信息表（orders）为例，其他表可依次添加实体类

User.java

package com.example.morningboxspring.model;


import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

import java.time.LocalDateTime;

/**
 * 功能：User表实体类
 * 作者：爱因斯坦乐
 * 日期：2025/3/1
 */
@Data
@TableName("user")// 指定数据库表名
public class User {
    @TableId(type = IdType.AUTO) // 主键自增
    private Long userId;

    private String openid; // 微信OpenID
    private String phone; // 手机号
    private String nickname; // 昵称
    private String avatarUrl; // 头像URL
    private LocalDateTime createTime; // 注册时间
}

Address.java

package com.example.morningboxspring.model;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

/**
 * 功能：Address表实体类
 * 作者：爱因斯坦乐
 * 日期：2025/3/1
 */
@Data
@TableName("address") // 指定数据库表名
public class Address {
    @TableId(type = IdType.AUTO) // 主键自增
    private Long addressId;

    private Long userId; // 用户ID
    private String contactName; // 联系人姓名
    private String contactPhone; // 联系人手机号
    private String detailAddress; // 详细地址
    private Integer isDefault; // 是否默认地址
}

Order.java

package com.example.morningboxspring.model;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

import java.time.LocalDateTime;

/**
 * 功能：Order表实体类
 * 作者：爱因斯坦乐
 * 日期：2025/3/1
 */
@Data
@TableName("orders") // 指定数据库表名
public class Order {
    @TableId(type = IdType.AUTO) // 主键自增
    private Long orderId;

    private Long userId; // 用户ID
    private Long merchantId; // 商家ID
    private Long addressId; // 地址ID
    private Double totalAmount; // 总金额
    private String status; // 订单状态
    private LocalDateTime createTime; // 创建时间
}