spring cloud、gradle、父子项目、微服务框架搭建---引入MyBatis-Plus(四)

总目录

https://preparedata.blog.csdn.net/article/details/120062997

一、引入依赖

MyBatis-Plus对MyBatis做了功能封装，仅仅引入MyBatis-Plus即可

//mysql连接
implementation 'mysql:mysql-connector-java:8.0.23'
//mybatis-plus  地址：https://baomidou.com/
implementation 'com.baomidou:mybatis-plus-boot-starter:3.5.2'

二、配置mybatis-plus

1.配置数据源

  datasource:
    url: jdbc:mysql://localhost:3306/shopping-order?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&rewriteBatchedStatements=true
    username: root
    password: 123456
    # 使用com.mysql.cj.jdbc.Driver 或 com.mysql.jdbc.Driver 要依据MySQL的版本
    driver-class-name: com.mysql.cj.jdbc.Driver

驱动使用com.mysql.cj.jdbc.Driver 或 com.mysql.jdbc.Driver 要依据MySQL的版本

2.配置mybatis-plus

mybatis-plus:
  # sql xml映射文件目录，配置在resources/mybatis文件夹下, 自定义目录：mybatis/*Mapper.xml
  mapper-locations: classpath:mybatis/*Mapper.xml
  # 数据库表实体目录   与步骤（四）中相匹配实体包地址匹配
  typeAliasesPackage: com.pd.shopping.order.model.entity

三、服务启动类配置@MapperScan

com.pd.shopping.order.mapper 为mapper文件的包地址， 也就是步骤（五）中Mapper接口的包地址

@MapperScan("com.pd.shopping.order.mapper")

四、新建实体

实体包地址 com.pd.shopping.order.model.entity 需要与步骤（二）中相匹配

package com.pd.shopping.order.model.entity;

import com.baomidou.mybatisplus.annotation.TableName;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import lombok.Data;

@Data
@TableName("order_detail")
public class OrderDetail {

    private Long id;

    private String code;
}

五、新建Mapper接口

Mapper接口的包地址 com.pd.shopping.order.mapper 需要与步骤（三）中相匹配，这样才能被MapperScan扫描到

package com.pd.shopping.order.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.pd.shopping.order.model.entity.OrderDetail;

public interface OrderDetailMapper extends BaseMapper<OrderDetail> {

    //自定义操作表数据方法
}

六、新建Mapper接口的Mapper.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.pd.shopping.order.mapper.OrderDetailMapper">

<!-- 自定义操作表数据方法 -->

</mapper>

七、新建接口

package com.pd.shopping.order.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.pd.shopping.order.model.entity.OrderDetail;


public interface OrderDetailService extends IService<OrderDetail> {
}

八、新建接口的实现

package com.pd.shopping.order.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.pd.shopping.order.mapper.OrderMapper;
import com.pd.shopping.order.model.entity.Order;
import com.pd.shopping.order.service.OrderService;

public class OrderServiceImpl extends ServiceImpl<OrderMapper, Order> implements OrderService {

}

九、测试

package com.pd.shopping.order.controller;

import com.pd.shopping.order.model.entity.OrderDetail;
import com.pd.shopping.order.service.OrderDetailService;
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;

@RestController
@RequestMapping("/hello")
public class HelloController {

    @Autowired
    private OrderDetailService orderDetailService;

    @GetMapping("/getOrderList")
    public void getOrderList() {
        OrderDetail list =  orderDetailService.getById(1L);
    }
}

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