• 前言
  • 環境
• 具體實現
  • 專案結構
  • 專案配置
  • 實現程式碼
  • 測試

前言

Mybatis-Plus是Mybatis的增強，Mybatis-Plus在Mybatis的基礎上借鑑了很多JPA的做法，記錄下SpringBoot下的整合方法。

環境

SpringBoot2.53 + Mybatis-Plus3.3.0

具體實現

專案結構

專案配置

• pom.xml

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

<!-- mysql -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

<!-- mybatis-plus -->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.3.0</version>
</dependency>

<!-- lombok -->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <scope>provided</scope>
</dependency>
 

• application.yml

spring:
  application:
    name: mybatis-learn
  # 檔案編碼 UTF8
  mandatory-file-encoding: UTF-8
  # 資料來源配置，請修改為你專案的實際配置
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/cms?useSSL=false&serverTimezone=UTC&characterEncoding=UTF8
    username: root
    password: sunday

# mybatis-plus配置
mybatis-plus:
  configuration:
    # 開啟下劃線轉駝峰
    map-underscore-to-camel-case: true
  # mapper路徑位置
  mapper-locations: classpath:mapper/*.xml

server:
  port: 8084
 

• Table

CREATE TABLE `product` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `title` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `create_time` datetime DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci

實現程式碼

• 啟動類

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

@SpringBootApplication
@MapperScan(basePackages = "com.coisini.mybatisplus.mapper") // mapper掃描位置
public class MybatisplusApplication {

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

}

• ProductController.java

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;

@RequestMapping("/product")
@RestController
public class ProductController {

    @Autowired
    private ProductService productService;

    /**
     * 查詢Products
     * @return
     */
    @GetMapping("/select")
    public List<Product> selectProducts() {
        return productService.getProducts();
    }

}

• ProductService.java

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;

@Service
public class ProductService {

    @Autowired
    private ProductMapper productMapper;

    /**
     * 查詢products
     * @return
     */
    public List<Product> getProducts() {
        return productMapper.selectList(null);
    }

}

• ProductMapper.java

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.springframework.stereotype.Repository;

@Repository
public interface ProductMapper extends BaseMapper<Product> {
	// 繼承 BaseMapper，與JPA類似
}

• Product.java

import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Getter;
import lombok.Setter;
import java.util.Date;

@Getter
@Setter
@TableName("product")
public class Product {

    private Integer id;

    private String title;

    private Date createTime;

}

測試