1. 相关数据表


DROP TABLE IF EXISTS `order`;
CREATE TABLE `order` (
  `id` int(20) NOT NULL AUTO_INCREMENT,
  `name` varchar(20) DEFAULT NULL,
  `memo` varchar(2000) DEFAULT NULL,
  `create_time` DATETIME NOT NULL,
  `price` decimal(14,2) NOT NULL,
  `seller_id` int(20) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;

DROP TABLE IF EXISTS `seller`;
CREATE TABLE `seller` (
  `id` int(20) NOT NULL AUTO_INCREMENT,
  `name` varchar(20) DEFAULT NULL,
  `memo` varchar(2000) DEFAULT NULL,
  `create_time` DATETIME NOT NULL,
  `phone` varchar(20) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;

DROP TABLE IF EXISTS `order_goods`;
CREATE TABLE `order_goods` (
  `id` int(20) NOT NULL AUTO_INCREMENT,
  `order_id` int(20) NOT NULL,
  `goods_name` varchar(20) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;

2. Seller.java, Order.java, OrderGoods.java


public class Seller {
    private Integer id;
    private String name;
    private String memo;
    protected String createTime;
    private String phone;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getMemo() {
        return memo;
    }

    public void setMemo(String memo) {
        this.memo = memo;
    }

    public String getCreateTime() {
        return createTime;
    }

    public void setCreateTime(String createTime) {
        this.createTime = createTime;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    @Override
    public String toString() {
        return "Seller{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", memo='" + memo + '\'' +
                ", createTime=" + createTime +
                ", phone='" + phone + '\'' +
                '}';
    }

}

import java.math.BigDecimal;
import java.util.List;

public class Order {
    private Long id;
    private String name;
    public String memo;
    public String createTime;
    public BigDecimal price;
    public Seller seller;
    private List<OrderGoods> orderGoodses;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getMemo() {
        return memo;
    }

    public void setMemo(String memo) {
        this.memo = memo;
    }

    public String getCreateTime() {
        return createTime;
    }

    public void setCreateTime(String createTime) {
        this.createTime = createTime;
    }

    public BigDecimal getPrice() {
        return price;
    }

    public void setPrice(BigDecimal price) {
        this.price = price;
    }

    public Seller getSeller() {
        return seller;
    }

    public void setSeller(Seller seller) {
        this.seller = seller;
    }

    public List<OrderGoods> getOrderGoodses() {
        return orderGoodses;
    }

    public void setOrderGoodses(List<OrderGoods> orderGoodses) {
        this.orderGoodses = orderGoodses;
    }

    @Override
    public String toString() {
        return "Order{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", memo='" + memo + '\'' +
                ", createTime='" + createTime + '\'' +
                ", price=" + price +
                ", seller=" + seller +
                ", orderGoodses=" + orderGoodses +
                '}';
    }

}

public class OrderGoods {
    private Long id;
    private Long orderId;
    private String goodsName;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public Long getOrderId() {
        return orderId;
    }

    public void setOrderId(Long orderId) {
        this.orderId = orderId;
    }

    public String getGoodsName() {
        return goodsName;
    }

    public void setGoodsName(String goodsName) {
        this.goodsName = goodsName;
    }

    @Override
    public String toString() {
        return "OrderGoods{" +
                "id=" + id +
                ", orderId=" + orderId +
                ", goodsName='" + goodsName + '\'' +
                '}';
    }

}

3. OrderMapper.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.test.web3.OrderMapper">
    <!-- 将查询结果映射到指定字段! -->
    <resultMap id="OrderResult"             type="com.test.web3.entity.Order">
        <result column="id"                         property="id" />
        <result column="name"                       property="name" />
        <result column="memo"                       property="memo" />
        <result column="create_time"                property="createTime" />
        <result column="price"                      property="price" />
        <!-- Order.java内部属性 seller, 通过参数 javaType指定类型 -->
        <!-- association是用于映射单个对象的信息 -->
        <association property="seller"       javaType="com.test.web3.entity.Seller">
            <id column="seller_id"                  property="id"/>
            <result column="seller_name"            property="name" />
            <result column="seller_memo"            property="memo" />
            <result column="seller_create_time"     property="createTime" />
            <result column="phone"                  property="phone" />
        </association>
        <!-- collection是用于映射多个对象的信息 -->
        <collection property="orderGoodses"       ofType="com.test.web3.entity.OrderGoods">
            <id column="order_goods_id"             property="id"/>
            <result column="id"                     property="orderId" />
            <result column="order_goods_goods_name" property="goodsName" />
        </collection>
    </resultMap>

    <select id="viewOrderById" resultMap="OrderResult" parameterType="java.util.Map">
        SELECT `order`.`id`,`order`.`name`,`order`.`memo`,`order`.`create_time`,`order`.`price`,`order`.`seller_id`,
        `seller`.`name` AS `seller_name`,`seller`.`memo` AS `seller_memo`,`seller`.`create_time` AS `seller_create_time`,`seller`.`phone`,
        `order_goods`.`id` AS `order_goods_id`, `order_goods`.`goods_name` AS `order_goods_goods_name`
        FROM
        `order`
        LEFT JOIN
        `seller`
          ON `order`.`seller_id` = `seller`.`id`
        LEFT JOIN
        `order_goods`
          ON `order`.`id` = `order_goods`.`order_id`
        WHERE
        1
        <if test="keywords !=null and keywords != ''">
            AND CONCAT(`order`.`name`, `seller`.`name`) LIKE CONCAT ('%', #{keywords},'%')
        </if>
        ORDER BY `order`.`id` DESC, `order_goods`.`id` ASC
	</select>

</mapper>

4. DAO(Data Access Object)数据访问接口 OrderDao.java和实现类 OrderDaoImpl.java


import com.test.web3.entity.Order;
import java.util.List;

public interface OrderDao {
    List<Order> listByKeywords(String keywords);
}

import com.test.web3.dao.OrderDao;
import com.test.web3.entity.Order;
import org.apache.ibatis.session.SqlSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Repository
public class OrderDaoImpl implements OrderDao {
    @Autowired
    private SqlSession sqlSession;

    static final String MAPPER = "com.test.web3.OrderMapper.";

    public List<Order> listByKeywords(final String keywords) {
        final Map<String, String> params = new HashMap<>();
        params.put("keywords", keywords);
        return sqlSession.selectList(MAPPER + "viewOrderById", params);
    }

}

5. OrderController.java(入口)


@Controller
public class OrderController {
    @Autowired
    private OrderDao orderDao;

    /**
     * 搜索订单列表
     * */
    @RequestMapping(value = "/orderList", method = RequestMethod.GET)
    public @ResponseBody Map<String, Object> orderList(@RequestParam(value = "keywords", defaultValue="") String keywords) {
        /**
         * 搜索订单列表
         * */
        final List<Order> order = orderDao.listByKeywords(keywords);

        final Map<String, Object> result = new HashMap<>();
        result.put("data", order);
        return result;
    }
    
}

6. 搜索结果

http://127.0.0.1:8080/orderList?keywords=测试


{
	"data": [{
		"id": 10,
		"name": "早餐超市",
		"memo": "尽快发货!!",
		"createTime": "2019-09-24 14:58:55.0",
		"price": 10.58,
		"seller": {
			"id": 2,
			"name": "测试商家",
			"memo": "生意好!!",
			"createTime": "2019-09-02 14:58:30.0",
			"phone": "18812341234"
		},
		"orderGoodses": [{
			"id": 4,
			"orderId": 10,
			"goodsName": "油条"
		}, {
			"id": 6,
			"orderId": 10,
			"goodsName": "馒头"
		}, {
			"id": 7,
			"orderId": 10,
			"goodsName": "包子"
		}]
	}, {
		"id": 2,
		"name": "晚餐超市",
		"memo": "测试记录",
		"createTime": "2019-09-24 17:48:15.0",
		"price": 99.99,
		"seller": {
			"id": 4,
			"name": "测试！",
			"memo": "拉拉",
			"createTime": "2019-09-23 17:47:47.0",
			"phone": "18811112222"
		},
		"orderGoodses": [{
			"id": 3,
			"orderId": 2,
			"goodsName": "麻花"
		}, {
			"id": 5,
			"orderId": 2,
			"goodsName": "豆浆"
		}]
	}]
}

如果您觉得有帮助，欢迎点赞哦 ~ 谢谢!!

Shawn Jeon

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私信关注

Java MyBatis 映射单个对象查询(一对一查询)/ 映射多个对象查询(一对多查询)/ 模糊查询搜索亲测

Java MyBatis 映射单个对象查询, 映射多个对象查询, 模糊查询搜索

1. 相关数据表

2. Seller.java, Order.java, OrderGoods.java

3. OrderMapper.xml

4. DAO(Data Access Object)数据访问接口 OrderDao.java和实现类 OrderDaoImpl.java

5. OrderController.java(入口)

6. 搜索结果

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1. 相关数据表

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3. OrderMapper.xml

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5. OrderController.java(入口)

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