15 myBatis-07-案例實踐==

案例表結構：

1、用戶表

2、訂單表

3、訂單明細表

4、商品表

表結構關係相對比較清楚。

0、項目代碼結構

 

1、表結構創建

客戶表

-- ----------------------------
-- Table structure for ex_customer
-- ----------------------------
DROP TABLE IF EXISTS `ex_customer`;
CREATE TABLE `ex_customer`  (
  `custId` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `custName` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `telephone` varchar(11) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `sex` char(2) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `remark` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`custId`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of ex_customer
-- ----------------------------
INSERT INTO `ex_customer` VALUES ('C001', '顧問', '15345187579', '男', '顧問');
INSERT INTO `ex_customer` VALUES ('C002', '曹陽', '15345187577', '男', '曹陽');

SET FOREIGN_KEY_CHECKS = 1;

訂單表

-- ----------------------------
-- Table structure for ex_order
-- ----------------------------
DROP TABLE IF EXISTS `ex_order`;
CREATE TABLE `ex_order`  (
  `orderId` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `custId` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `orderDate` datetime NULL DEFAULT NULL,
  `totalMoney` decimal(10, 2) NULL DEFAULT NULL,
  `remark` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`orderId`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of ex_order
-- ----------------------------
INSERT INTO `ex_order` VALUES ('T0001', 'C001', '2021-01-01 00:00:00', 7000.00, '測試訂單');

SET FOREIGN_KEY_CHECKS = 1;

訂單明細表

-- ----------------------------
-- Table structure for ex_orderdetail
-- ----------------------------
DROP TABLE IF EXISTS `ex_orderdetail`;
CREATE TABLE `ex_orderdetail`  (
  `detailId` bigint(20) NOT NULL AUTO_INCREMENT,
  `orderId` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `prodId` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `buyPrice` decimal(10, 2) NULL DEFAULT NULL,
  `buyCount` int(11) NULL DEFAULT NULL,
  `remark` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`detailId`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of ex_orderdetail
-- ----------------------------
INSERT INTO `ex_orderdetail` VALUES (1, 'T0001', 'P001', 2000.00, 2, NULL);
INSERT INTO `ex_orderdetail` VALUES (2, 'T0001', 'P002', 3000.00, 1, NULL);

SET FOREIGN_KEY_CHECKS = 1;

商品表

-- ----------------------------
-- Table structure for ex_product
-- ----------------------------
DROP TABLE IF EXISTS `ex_product`;
CREATE TABLE `ex_product`  (
  `prodId` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `prodName` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `sellPrice` decimal(10, 2) NULL DEFAULT NULL,
  `imgUrl` varchar(500) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `remark` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`prodId`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of ex_product
-- ----------------------------
INSERT INTO `ex_product` VALUES ('P001', '手機', 2000.00, NULL, NULL);
INSERT INTO `ex_product` VALUES ('P002', '平板', 3000.00, NULL, NULL);

SET FOREIGN_KEY_CHECKS = 1;

2、模型類定義

2.1、用戶模型

package db.Model;


//客戶模型
public class ex_Customer {
    private String custId;
    private String custName;
    private String telephone;
    private String sex;
    private String remark;

    public String getCustId() {
        return custId;
    }

    public void setCustId(String custId) {
        this.custId = custId;
    }

    public String getCustName() {
        return custName;
    }

    public void setCustName(String custName) {
        this.custName = custName;
    }

    public String getTelephone() {
        return telephone;
    }

    public void setTelephone(String telephone) {
        this.telephone = telephone;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }

    @Override
    public String toString() {
        return "ex_customer{" +
                "custId='" + custId + '\'' +
                ", custName='" + custName + '\'' +
                ", telephone='" + telephone + '\'' +
                ", sex='" + sex + '\'' +
                ", remark='" + remark + '\'' +
                '}';
    }
}

2.2、訂單模型

package db.Model;

import java.util.Date;
import java.util.List;

//訂單模型
public class ex_Order {
    private String orderId;
    private String custId;
    private Date orderDate;
    private double totalMoney;
    private String remark;
    //包含客戶表引用
    private ex_Customer orderCust;
    //包含訂單明細
    private List<ex_OrderDetail> orderDetail;

    public String getOrderId() {
        return orderId;
    }

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

    public String getCustId() {
        return custId;
    }

    public void setCustId(String custId) {
        this.custId = custId;
    }

    public Date getOrderDate() {
        return orderDate;
    }

    public void setOrderDate(Date orderDate) {
        this.orderDate = orderDate;
    }

    public double getTotalMoney() {
        return totalMoney;
    }

    public void setTotalMoney(double totalMoney) {
        this.totalMoney = totalMoney;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }

    public ex_Customer getOrderCust() {
        return orderCust;
    }

    public void setOrderCust(ex_Customer orderCust) {
        this.orderCust = orderCust;
    }

    public List<ex_OrderDetail> getOrderDetail() {
        return orderDetail;
    }

    public void setOrderDetail(List<ex_OrderDetail> orderDetail) {
        this.orderDetail = orderDetail;
    }

    @Override
    public String toString() {
        String result = "ex_order{" +
                "orderId='" + orderId + '\'' +
                ", cusId='" + custId + '\'' +
                ", orderDate=" + orderDate +
                ", totalMoney=" + totalMoney +
                ", remark='" + remark + '\'' +
                '}';
        if(orderCust!= null)
            result += "\n" + orderCust.toString();
        if(orderDetail != null)
        {
            result += "\n訂單包含如下的訂單明細數據";
            for(ex_OrderDetail detail:orderDetail)
            {
                result += "\n" + detail.toString();
            }
        }
        return  result;
    }
}

2.3、訂單明細模型

package db.Model;

//訂單明細
public class ex_OrderDetail {
    private long detailId;
    private String orderId;
    private String prodId;
    private double buyPrice;
    private int buyCount;
    private String remark;

    //包含訂單商品引用
    private ex_Product orderProd;

    public long getDetailId() {
        return detailId;
    }

    public void setDetailId(long detailId) {
        this.detailId = detailId;
    }

    public String getOrderId() {
        return orderId;
    }

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

    public String getProdId() {
        return prodId;
    }

    public void setProdId(String prodId) {
        this.prodId = prodId;
    }

    public double getBuyPrice() {
        return buyPrice;
    }

    public void setBuyPrice(double buyPrice) {
        this.buyPrice = buyPrice;
    }

    public int getBuyCount() {
        return buyCount;
    }

    public void setBuyCount(int buyCount) {
        this.buyCount = buyCount;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }

    public ex_Product getOrderProd() {
        return orderProd;
    }

    public void setOrderProd(ex_Product orderProd) {
        this.orderProd = orderProd;
    }

    @Override
    public String toString() {
        String result = "ex_Orderdetail{" +
                "detailId=" + detailId +
                ", orderId='" + orderId + '\'' +
                ", prodId='" + prodId + '\'' +
                ", buyPrice=" + buyPrice +
                ", buyCount=" + buyCount +
                ", remark='" + remark + '\'' +
                '}';
        if(orderProd != null)
        {
            result += "\n" + orderProd.toString();
        }
        return result;
    }
}

2.4、商品模型

package db.Model;

//產品模型
public class ex_Product {
    private String prodId;
    private String prodName;
    private double sellPrice;
    private String imgUrl;
    private String remark;

    public String getProdId() {
        return prodId;
    }

    public void setProdId(String prodId) {
        this.prodId = prodId;
    }

    public String getProdName() {
        return prodName;
    }

    public void setProdName(String prodName) {
        this.prodName = prodName;
    }

    public double getSellPrice() {
        return sellPrice;
    }

    public void setSellPrice(double sellPrice) {
        this.sellPrice = sellPrice;
    }

    public String getImgUrl() {
        return imgUrl;
    }

    public void setImgUrl(String imgUrl) {
        this.imgUrl = imgUrl;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }

    @Override
    public String toString() {
        return "ex_product{" +
                "prodId='" + prodId + '\'' +
                ", prodName='" + prodName + '\'' +
                ", sellPrice=" + sellPrice +
                ", imgUrl='" + imgUrl + '\'' +
                ", remark='" + remark + '\'' +
                '}';
    }
}

3、訪問層接口

訂單訪問接口，通過訂單查詢其它相關的數據

package db.Dao;

public interface ex_OrderDao {
    public db.Model.ex_Order findByKey(String orderId);
}

4、映射文件定義

src/main/resources/db/mapper/ex_Order.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="db.Dao.ex_OrderDao">
    <select id="findByKey" resultMap="orderResult">
        Select ex_order.*,
               custName,telephone,sex,ex_customer.remark as ex_customer_remark,
               detailId,ex_orderdetail.prodId,buyCount,buyPrice,
               prodName,sellPrice,imgUrl
        from ex_order
        left join ex_customer on ex_order.custId = ex_customer.custId
        left join ex_orderdetail on ex_order.orderId = ex_orderdetail.orderId
        left join ex_product on ex_orderdetail.prodId = ex_product.prodId
        where ex_order.orderId=#{orderId}
    </select>

    <!-- 定義訂單查詢結果映射 -->
    <resultMap id="orderResult" type="db.Model.ex_Order">
        <id property="orderId" column="orderId"/>
        <result property="custId" column="custId"/>
        <result property="orderDate" column="orderDate"/>
        <result property="totalMoney" column="totalMoney"/>
        <result property="remark" column="remark"/>
        <!--客戶關聯,通過javaType設置映射的類型-->
        <association property="orderCust" javaType="db.Model.ex_Customer" resultMap="customerResult">

        </association>
        <!--訂單明細集合，通過ofType設置映射的類型-->
        <collection property="orderDetail" ofType="db.Model.ex_OrderDetail" resultMap="orderDetailResult" >

        </collection>
    </resultMap>

    <!--客戶映射-->
    <resultMap id="customerResult" type="db.Model.ex_Customer">
        <id property="custId" column="custId"/>
        <result property="custName" column="custName"/>
        <result property="telephone" column="telephone"/>
        <result property="sex" column="sex"/>
        <!--列明重複時解決方案-->
        <result property="remark" column="ex_customer_remark"/>
    </resultMap>

    <!--訂單明細映射-->
    <resultMap id="orderDetailResult" type="db.Model.ex_OrderDetail">
        <id property="detailId" column="detailId"/>
        <result property="orderId" column="orderId"/>
        <result property="prodId" column="prodId"/>
        <result property="buyPrice" column="buyPrice"/>
        <result property="buyCount" column="buyCount"/>
        <result property="remark" column="remark"/>
        <!--商品關聯-->
        <association property="orderProd" javaType="db.Model.ex_Product" resultMap="productResult">

        </association>
    </resultMap>

    <!--商品映射-->
    <resultMap id="productResult" type="db.Model.ex_Product">
        <id property="prodId" column="prodId"></id>
        <result property="prodName" column="prodName"/>
        <result property="sellPrice" column="sellPrice"/>
        <result property="imgUrl" column="imgUrl"/>
    </resultMap>
</mapper>

5、測試查詢

import db.Dao.ex_OrderDao;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import java.io.IOException;
import java.io.InputStream;

public class myTest {
    //1對1操作
    @Test
    public void TestMyBaisc_01() throws IOException {
        //1 讀取配置文件
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        //2 構建SqlSessionFactory
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        //3 構建SqlSession,並執行mapper內操作
        try (SqlSession session = sqlSessionFactory.openSession()) {
            //獲取接口代理實現
            ex_OrderDao dao = session.getMapper(ex_OrderDao.class);
            db.Model.ex_Order entry = dao.findByKey("T0001");
            System.out.println(entry.toString());
        }
        System.out.println("測試完成1");
    }
}

運行結果：

 

 

6、多對多映射==

7、延遲加載==