总概

A、技术栈

• 开发语言：Java 1.8
• 数据库：MySQL、Redis、MongoDB、Elasticsearch
• 微服务框架：Spring Cloud Alibaba
• 微服务网关：Spring Cloud Gateway
• 服务注册和配置中心：Nacos
• 分布式事务：Seata
• 链路追踪框架：Sleuth
• 服务降级与熔断：Sentinel
• ORM框架：MyBatis-Plus
• 分布式任务调度平台：XXL-JOB
• 消息中间件：RocketMQ
• 分布式锁：Redisson
• 权限：OAuth2
• DevOps：Jenkins、Docker、K8S

B、本节实现目标

• 分页查询订单。

一、MyBatis-Plus分页插件

MyBatis新版分页插件配置和旧版的一样，参考MyBatis-Plus官网：分页插件

在mall-common项目中新建MyBatis-Plus分页插件配置

package com.ac.common.config.mybatis;

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

@Configuration
public class GlobalMybatisConfig {
    /**
     * 设置插件
     */
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();

        //分页插件
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.H2));

        //乐观锁
        interceptor.addInnerInterceptor(new OptimisticLockerInnerInterceptor());
        return interceptor;
    }
}

mall-common项目截图

二、分页查询订单实现

2.1 分页查询对象

分页查询对象OrderPageQry继承MyBaits分页对象Page，注意是为了在写订单分页查询service时，不想提供两个参数，而共用一个参数。

@Data
public class OrderPageQry extends Page {

    @ApiModelProperty("用户ID")
    private Long memberId;

    @ApiModelProperty("订单号")
    private String orderNo;

    @ApiModelProperty("用户姓名")
    private String memberName;

    @ApiModelProperty("手机号")
    private String mobile;
}

2.2 mapper层

/**
 * @description 订单-数据访问层(依赖mybatis-plus)，对应mapper.xml里的自定义sql
 */
public interface OrderMapper extends BaseMapper<Order> {

    /**
     * 分页查询订单
     *
     * @param page 分页查询参数
     * @param qry  查询参数
     * @return
     */
    IPage<OrderDTO> pageOrder(Page page, @Param("qry") OrderPageQry qry);
}

xml代码

<?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.ac.order.mapper.OrderMapper">

    <sql id="OrderDTO_Column">
        t.id,
        t.order_no,
        t.pay_channel,
        t.order_state,
        t.order_time,
        t.pay_time,
        t.refund_time,
        t.member_id,
        t.member_name,
        t.mobile,
        t.product_amount,
        t.discount_amount,
        t.pay_amount
    </sql>

    <select id="pageOrder" resultType="com.ac.order.dto.OrderDTO">
        select
            <include refid="OrderDTO_Column"></include>
        from
            t_order t
        <where>
            t.deleted = 0
            <if test="qry.memberId!=null">
                and t.member_id=#{qry.memberId}
            </if>

            <if test="qry.orderNo!=null and qry.orderNo!=''">
                and t.order_no=#{qry.orderNo}
            </if>

            <if test="qry.memberName!=null and qry.memberName!=''">
                and t.member_name like concat('%', #{qry.memberName}, '%')
            </if>

            <if test="qry.mobile!=null and qry.mobile!=''">
                and t.mobile = #{qry.mobile}
            </if>
        </where>
        order by t.create_time desc
    </select>
</mapper>

2.3 dao层

@Slf4j
@Repository
public class OrderDaoImpl extends ServiceImpl<OrderMapper, Order> implements OrderDao {

    @Resource
    private OrderMapper orderMapper;

    @Override
    public IPage<OrderDTO> pageOrder(OrderPageQry qry) {
        return orderMapper.pageOrder(qry, qry);
    }
}

2.4 service层

@Slf4j
@Service
public class OrderServiceImpl implements OrderService {
    @Override
    public IPage<OrderDTO> pageOrder(OrderPageQry qry) {
        return orderDaoImpl.pageOrder(qry);
    }
}

2.5 controller层

@Api(tags = "订单")
@RestController
@RequestMapping("order")
public class OrderController {

    @Resource
    private OrderService orderServiceImpl;

    @ApiOperation(value = "分页查询订单")
    @GetMapping("page")
    public IPage<OrderDTO> pageOrder(@Valid OrderPageQry qry) {
        return orderServiceImpl.pageOrder(qry);
    }
}

三、订单分页查询测试

订单分页查询测试

后台打印sql

==>  Preparing: select t.id, t.order_no, t.pay_channel, t.order_state, t.order_time, t.pay_time, t.refund_time, t.member_id, t.member_name, t.mobile, t.product_amount, t.discount_amount, t.pay_amount from t_order t WHERE t.deleted = 0 and t.member_id=? order by t.create_time desc LIMIT ? OFFSET ?
==> Parameters: 264260572479489(Long), 2(Long), 2(Long)