Mybatis-Plus不支持联合主键(复合主键)怎么办？试试Mybatis-Tiny

Mybatis-Tiny是什么

Mybatis-Tiny是一个基于Mybatis框架的一层极简的扩展，它旨在使用DSL的方式对单表进行CRUD操作，类似于Mybatis-Plus框架，但它绝不是重复造轮子！区别于别的类似框架（如Mybatis-Plus、Fluent-Mybatis等）的实现方式，它采用一种逆向曲线救国的实现方式，通过较少的代码，极简的扩展实现了类似于他们大多数的功能，完全满足日常开发中对单表的各种CRUD操作。

项目地址：https://github.com/penggle/my...

联合主键使用案例

引入并使用Mybatis-Tiny

（以下基于SpringBoot方式使用Mybatis）

引入依赖


    io.github.penggle
    mybatis-tiny-core
    
    3.5

基于Mybatis-Tiny的联合主键使用案例

基于注解的实体对象定义：

package com.penglecode.samples.order.domain.model;

import com.penglecode.codeforce.common.domain.EntityObject;
import com.penglecode.codeforce.mybatistiny.annotations.GenerationType;
import com.penglecode.codeforce.mybatistiny.annotations.Id;
import com.penglecode.codeforce.mybatistiny.annotations.Table;
import com.penglecode.samples.order.domain.enums.OrderStatusEnum;

/**
 * 主订单信息
 */
@Table("t_order")
public class Order implements EntityObject {

    /** 订单ID */
    @Id(strategy=GenerationType.NONE)
    private Long orderId;

    /** 客户ID */
    private Long customerId;

    /** 总金额(单位分) */
    private Long totalAmount;

    /** 总运费(单位分) */
    private Long totalFreight;

    /** 商户ID */
    private Long shopId;

    /** 下单时间 */
    private String orderTime;

    /** 订单状态 */
    private OrderStatusEnum orderStatus;

    /** 订单备注 */
    private String remark;

    private String createTime;

    private String updateTime;

    //getter/setter省略

    @Override
    public Long identity() {
        return orderId;
    }

}

package com.penglecode.samples.order.domain.model;

import com.penglecode.codeforce.common.domain.EntityObject;
import com.penglecode.codeforce.common.domain.ID;
import com.penglecode.codeforce.mybatistiny.annotations.GenerationType;
import com.penglecode.codeforce.mybatistiny.annotations.Id;
import com.penglecode.codeforce.mybatistiny.annotations.Table;
import com.penglecode.samples.order.domain.enums.OrderStatusEnum;

/**
 * 订单明细
 */
@Table("t_order_line")
public class OrderLine implements EntityObject {

    /** 订单ID */
    @Id(strategy= GenerationType.NONE)
    private Long orderId;

    /** 商品ID */
    @Id(strategy=GenerationType.NONE)
    private Long productId;

    /** 商品名称 */
    private String productName;

    /** 商品详情页URL */
    private String productUrl;

    /** 商品单价(单位分) */
    private Long unitPrice;

    /** 购买数量 */
    private Integer quantity;

    /** 运费 */
    private Long freight;

    /** 小计(单位分) */
    private Long subTotalAmount;

    /** 订单状态 */
    private OrderStatusEnum orderStatus;

    /** 下单时间 */
    private String orderTime;

    private String createTime;

    private String updateTime;

    //getter/setter省略

    @Override
    public ID identity() {
        //联合主键
        return new ID().addKey("orderId", orderId).addKey("productId", productId);
    }

}

/**
 * 订单状态
 */
public enum OrderStatusEnum {

    WAIT_PAY,

    PAIED,

    REFUND,

    CLOSED

}

实体Mapper接口定义：

@Mapper
public interface OrderMapper extends BaseEntityMapper {

}

@Mapper
public interface OrderLineMapper extends BaseEntityMapper {

}

CRUD使用示例：

@SpringBootTest(classes=SamplesApplication.class)
public class OrderMapperTest {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private OrderLineMapper orderLineMapper;

    @Autowired
    private DataSourceTransactionManager dataSourceTransactionManager;

    protected  void doInTransaction(Supplier executor) {
        new TransactionTemplate(dataSourceTransactionManager).execute(status -> executor.get());
    }

    @Test
    public void createOrder() {
        doInTransaction(this::doCreateOrder);
    }

    protected Object doCreateOrder() {
        String nowTime = DateTimeUtils.formatNow();
        //Long orderId = System.currentTimeMillis();
        Long orderId = 1651560129068L;

        List orderLines = new ArrayList<>();
        OrderLine orderLine1 = new OrderLine();
        orderLine1.setProductId(100026667880L);
        orderLine1.setProductName("Apple iPhone 13 (A2634) 128GB 午夜色 支持移动联通电信5G 双卡双待手机");
        orderLine1.setProductUrl("https://item.jd.com/100026667880.html");
        orderLine1.setUnitPrice(599900L);
        orderLine1.setQuantity(1);
        orderLine1.setFreight(0L);
        orderLines.add(orderLine1);

        OrderLine orderLine2 = new OrderLine();
        orderLine2.setProductId(100034710000L);
        orderLine2.setProductName("Apple iPad Air5 10.9英寸平板电脑 2022年款(64G WLAN版/M1芯片Liquid视网膜屏 MME23CH/A) 紫色");
        orderLine2.setProductUrl("https://item.jd.com/100034710000.html");
        orderLine2.setUnitPrice(439900L);
        orderLine2.setQuantity(1);
        orderLine2.setFreight(0L);
        orderLines.add(orderLine2);

        Order order = new Order();
        order.setOrderId(orderId);
        order.setOrderTime(nowTime);
        order.setCustomerId(123L);
        order.setShopId(1000000127L);
        order.setTotalAmount(0L);
        order.setTotalFreight(0L);
        order.setOrderStatus(OrderStatusEnum.WAIT_PAY);
        order.setCreateTime(nowTime);
        order.setUpdateTime(nowTime);

        for(OrderLine orderLine : orderLines) {
            orderLine.setOrderId(orderId);
            orderLine.setSubTotalAmount(orderLine.getUnitPrice() * orderLine.getQuantity());
            order.setTotalFreight(order.getTotalFreight() + orderLine.getFreight());
            order.setTotalAmount(order.getTotalAmount() + orderLine.getSubTotalAmount());
            orderLine.setOrderStatus(order.getOrderStatus());
            orderLine.setOrderTime(nowTime);
            orderLine.setCreateTime(nowTime);
            orderLine.setUpdateTime(nowTime);
        }

        //insert主订单信息
        orderMapper.insert(order);
        //批量insert订单明细
        orderLineMapper.batchUpdate(orderLines, orderLine -> orderLineMapper.insert(orderLine));
        return orderId;
    }

    @Test
    public void updateOrder() {
        doInTransaction(this::doUpdateOrder);
    }

    protected Object doUpdateOrder() {
        Long orderId = 1651560129068L;
        String nowTime = DateTimeUtils.formatNow();
        OrderStatusEnum targetOrderStatus = OrderStatusEnum.PAIED;

        Map orderUpdateColumns = MapLambdaBuilder.ofEmpty()
                .withOverride(Order::getOrderStatus, targetOrderStatus)
                .withOverride(Order::getRemark, "已付款，请发顺丰快递!")
                .withOverride(Order::getUpdateTime, nowTime)
                .build();
        orderMapper.updateById(orderId, orderUpdateColumns); //更新主订单

        Map orderLineUpdateColums = MapLambdaBuilder.ofEmpty()
                .withOverride(OrderLine::getOrderStatus, targetOrderStatus)
                .withOverride(OrderLine::getUpdateTime, nowTime)
                .build();
        QueryCriteria orderLineUpdateCriteria = LambdaQueryCriteria.ofSupplier(OrderLine::new)
                .eq(OrderLine::getOrderId, orderId);
        orderLineMapper.updateByCriteria(orderLineUpdateCriteria, orderLineUpdateColums); //更新子订单
        return orderId;
    }

    @Test
    public void getOrderById() {
        Long orderId = 1651560129068L;
        Order order = orderMapper.selectById(orderId); //根据单个ID查询
        System.out.println(JsonUtils.object2Json(order));

        //联合主键
        List orderLineIds = new ArrayList<>();
        orderLineIds.add(new ID().addKey(OrderLine::getOrderId, orderId).addKey(OrderLine::getProductId, 100026667880L));
        orderLineIds.add(new ID().addKey(OrderLine::getOrderId, orderId).addKey(OrderLine::getProductId, 100034710000L));
        List orderLines = orderLineMapper.selectListByIds(orderLineIds); //根据多个ID查询
        orderLines.forEach(orderLine -> System.out.println(JsonUtils.object2Json(orderLine)));
    }

}

打印SQL：

#createOrder()

 - ==>  Preparing: INSERT INTO t_order( order_id, customer_id, total_amount, total_freight, shop_id, order_time, order_status, remark, create_time, update_time ) VALUES ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ? )
 - ==> Parameters: 1651560129068(Long), 123(Long), 1039800(Long), 0(Long), 1000000127(Long), 2022-05-03 17:29:30(String), WAIT_PAY(String), null, 2022-05-03 17:29:30(String), 2022-05-03 17:29:30(String)
 - <==    Updates: 1
 
 - ==>  Preparing: INSERT INTO t_order_line( order_id, product_id, product_name, product_url, unit_price, quantity, freight, sub_total_amount, order_status, order_time, create_time, update_time ) VALUES ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? )
 - ==> Parameters: 1651560129068(Long), 100026667880(Long), Apple iPhone 13 (A2634) 128GB 午夜色 支持移动联通电信5G 双卡双待手机(String), https://item.jd.com/100026667880.html(String), 599900(Long), 1(Integer), 0(Long), 599900(Long), WAIT_PAY(String), 2022-05-03 17:29:30(String), 2022-05-03 17:29:30(String), 2022-05-03 17:29:30(String)
 - ==> Parameters: 1651560129068(Long), 100034710000(Long), Apple iPad Air5 10.9英寸平板电脑 2022年款(64G WLAN版/M1芯片Liquid视网膜屏 MME23CH/A) 紫色(String), https://item.jd.com/100034710000.html(String), 439900(Long), 1(Integer), 0(Long), 439900(Long), WAIT_PAY(String), 2022-05-03 17:29:30(String), 2022-05-03 17:29:30(String), 2022-05-03 17:29:30(String)


#updateOrder()

 - ==>  Preparing: UPDATE t_order SET order_status = ?, remark = ?, update_time = ? WHERE order_id = ?
 - ==> Parameters: PAIED(String), 已付款，请发顺丰快递!(String), 2022-05-03 17:31:05(String), 1651560129068(Long)
 - <==    Updates: 1
 - ==>  Preparing: UPDATE t_order_line SET order_status = ?, update_time = ? WHERE order_id = ?
 - ==> Parameters: PAIED(String), 2022-05-03 17:31:05(String), 1651560129068(Long)
 - <==    Updates: 2
 
#getOrderById()

 - ==>  Preparing: SELECT order_id AS orderId, customer_id AS customerId, total_amount AS totalAmount, total_freight AS totalFreight, shop_id AS shopId, order_time AS orderTime, order_status AS orderStatus, remark AS remark, create_time AS createTime, update_time AS updateTime FROM t_order WHERE order_id = ?
 - ==> Parameters: 1651560129068(Long)
 - <==      Total: 1
 - ==>  Preparing: SELECT order_id AS orderId, product_id AS productId, product_name AS productName, product_url AS productUrl, unit_price AS unitPrice, quantity AS quantity, freight AS freight, sub_total_amount AS subTotalAmount, order_status AS orderStatus, order_time AS orderTime, create_time AS createTime, update_time AS updateTime FROM t_order_line WHERE (order_id = ? AND product_id = ?) OR (order_id = ? AND product_id = ?)
 - ==> Parameters: 1651560129068(Long), 100026667880(Long), 1651560129068(Long), 100034710000(Long)
 - <==      Total: 2

更多示例请见：https://github.com/penggle/my...