Mybatis实现订单案例的五表联合操作

其他 2020-03-11 12:03:02 阅读次数: 0

Mybatis实现订单案例的五表联合操作

上一个笔记中已经完成了五表的设计，本案例使用mybatis来完成相应的查询功能

  1. pom文件添加junit，mysql， mybatis（3.4.4）

  2. 设置mybatis的配置文件

    <?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">

<!--
    该配置文件中包含一个configuration节点
        里面有配置信息 分别是环境和映射
        　其中环境里有datasource，里面有我们熟悉的连接数据库的四个字符串
-->
<configuration>

    <!--
        引入db的配置文件信息，后面用到的四个连接字符串就可以直接使用 ${}的方式来动态引入
    -->
    <properties resource="db.properties" />

    <!--
        给当前mybatis项目添加日志功能，该STDOUT_LOGGING值的好处是不用添加第三方jar包就可以有日志的输出
    -->
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${user}"/>
                <property name="password" value="${pass}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/qfedu/mapper/OrderMapper.xml"/>
        <mapper resource="com/qfedu/mapper/UserMapper.xml"/>
        <mapper resource="com/qfedu/mapper/DetailMapper.xml"/>
        <mapper resource="com/qfedu/mapper/ProductMapper.xml"/>
        <mapper resource="com/qfedu/mapper/TypeMapper.xml"/>
    </mappers>
</configuration>

  3. db.properties数据库的配置文件

    driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mall
user=root
pass=123456

  4. 设计pojo类

    1. User.java

      package com.qfedu.pojo;

public class User {
    private int uid;
    private String name;
    private String pass;
    private String phone;

    @Override
    public String toString() {
        return "User{" +
                "uid=" + uid +
                ", name='" + name + '\'' +
                ", pass='" + pass + '\'' +
                ", phone='" + phone + '\'' +
                '}';
    }

    public int getUid() {
        return uid;
    }

    public void setUid(int uid) {
        this.uid = uid;
    }

    public String getName() {
        return name;
    }

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

    public String getPass() {
        return pass;
    }

    public void setPass(String pass) {
        this.pass = pass;
    }

    public String getPhone() {
        return phone;
    }

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

    2. Type.java

      package com.qfedu.pojo;

public class Types {

    private String tid;
    private String name;

    @Override
    public String toString() {
        return "Types{" +
                "tid=" + tid +
                ", name='" + name + '\'' +
                '}';
    }

    public String getTid() {
        return tid;
    }

    public void setTid(String tid) {
        this.tid = tid;
    }

    public String getName() {
        return name;
    }

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

    3. Product.java

      package com.qfedu.pojo;

public class Product {

    private String pid;
    private String name;
    private String img;
    private double price;
    private Types t;

    @Override
    public String toString() {
        return "Product{" +
                "pid='" + pid + '\'' +
                ", name='" + name + '\'' +
                ", img='" + img + '\'' +
                ", price=" + price +
                ", t=" + t +
                '}';
    }

    public String getPid() {
        return pid;
    }

    public void setPid(String pid) {
        this.pid = pid;
    }

    public String getName() {
        return name;
    }

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

    public String getImg() {
        return img;
    }

    public void setImg(String img) {
        this.img = img;
    }

    public double getPrice() {
        return price;
    }

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

    public Types getT() {
        return t;
    }

    public void setT(Types t) {
        this.t = t;
    }
}

    4. Detail.java

      package com.qfedu.pojo;

public class Detail {

    private String did;
    private int count;
    private Product pro;

    @Override
    public String toString() {
        return "Detail{" +
                "did='" + did + '\'' +
                ", count=" + count +
                ", pro=" + pro +
                '}';
    }

    public String getDid() {
        return did;
    }

    public void setDid(String did) {
        this.did = did;
    }

    public int getCount() {
        return count;
    }

    public void setCount(int count) {
        this.count = count;
    }

    public Product getPro() {
        return pro;
    }

    public void setPro(Product pro) {
        this.pro = pro;
    }
}

    5. Order.java

      package com.qfedu.pojo;

import java.util.List;

public class Order {

    private String oid;
    private double price;
    private String addr;
    private String payType;
    private User u;
    private List<Detail> details;

    @Override
    public String toString() {
        return "Order{" +
                "oid='" + oid + '\'' +
                ", price=" + price +
                ", addr='" + addr + '\'' +
                ", payType='" + payType + '\'' +
                ", u=" + u +
                ", details=" + details +
                '}';
    }

    public String getOid() {
        return oid;
    }

    public void setOid(String oid) {
        this.oid = oid;
    }

    public double getPrice() {
        return price;
    }

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

    public String getAddr() {
        return addr;
    }

    public void setAddr(String addr) {
        this.addr = addr;
    }

    public String getPayType() {
        return payType;
    }

    public void setPayType(String payType) {
        this.payType = payType;
    }

    public User getU() {
        return u;
    }

    public void setU(User u) {
        this.u = u;
    }

    public List<Detail> getDetails() {
        return details;
    }

    public void setDetails(List<Detail> details) {
        this.details = details;
    }
}

  5. 设置映射文件mapper

    1. 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">

<!--
    每个mapper文件都将有一个自己的映射的namespace，
    每个方法对应自己的sql语句，每个sql语句对应有一个id
    整个项目中所有的namespace.id必须是唯一的
-->
<mapper namespace="com.qfedu.pojo.OrderMapper">
    
    <select id="getOrderByOid" resultMap="orderMap">
      select * from orders where oid = #{oid}
    </select>
    
    <resultMap id="orderMap" type="com.qfedu.pojo.Order">

        <!--
            id代表主键，分别设置列和属性的对应关系
        -->
        <id property="oid" column="oid" ></id>

        <!--
            result代表普通字段的映射，分别指定列与属性的对应

            如果字段名和属性名一致，可以省略

            属性名叫做payType，字段名pay_type;
            <result column="pay_type" property="payType" />
        -->
        <result column="price" property="price" />
        <result column="addr" property="addr" />
        <result column="payType" property="payType" />

        <!--
            association关联，只要是"对一"的关系都可以使用association，代表关联
            property代表Order类中的属性名u
            column代表Orders表与Users表之间的关联字段
            select代表要使用该查询完成两表的联合查询得出user对象
        -->
        <association property="u" column="uid" select="com.qfedu.pojo.UserMapper.getUserByUid"></association>

        <!--
            collection设置集合，只要是"对多"多关系，都可以使用collection，代表集合
            column代表orders表与details表之间的关联字段
        -->
        <collection property="details" column="oid" select="com.qfedu.pojo.DetailMapper.getDetailsByOid" ofType="com.qfedu.pojo.Detail" />
    </resultMap>
</mapper>

    2. UserMapper.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">

<!--
    每个mapper文件都将有一个自己的映射的namespace，
    每个方法对应自己的sql语句，每个sql语句对应有一个id
    整个项目中所有的namespace.id必须是唯一的
-->
<mapper namespace="com.qfedu.pojo.UserMapper">
    
    <select id="getUserByUid" resultType="com.qfedu.pojo.User">
      select * from users where uid = #{uid}
    </select>
</mapper>

    3. DetailMapper.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">

<!--
    每个mapper文件都将有一个自己的映射的namespace，
    每个方法对应自己的sql语句，每个sql语句对应有一个id
    整个项目中所有的namespace.id必须是唯一的
-->
<mapper namespace="com.qfedu.pojo.DetailMapper">
    
    <select id="getDetailsByOid" resultMap="detailMap">
      select * from details where oid = #{oid}
    </select>

    <resultMap id="detailMap" type="com.qfedu.pojo.Detail">
        <id column="did" property="did"></id>

        <result property="count" column="count" />

        <association property="pro" column="pid" select="com.qfedu.pojo.ProductMapper.getProductByPid" />
    </resultMap>
</mapper>

    4. ProductMapper.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">

<!--
    每个mapper文件都将有一个自己的映射的namespace，
    每个方法对应自己的sql语句，每个sql语句对应有一个id
    整个项目中所有的namespace.id必须是唯一的
-->
<mapper namespace="com.qfedu.pojo.ProductMapper">
    
    <select id="getProductByPid" resultMap="productMap">
      select * from products where pid = #{uid}
    </select>

    <resultMap id="productMap" type="com.qfedu.pojo.Product">
        <id column="pid" property="pid"></id>

        <association property="t" column="tid" select="com.qfedu.pojo.TypeMapper.getTypesByTid" />
    </resultMap>
</mapper>

    5. TypeMapper.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">

<!--
    每个mapper文件都将有一个自己的映射的namespace，
    每个方法对应自己的sql语句，每个sql语句对应有一个id
    整个项目中所有的namespace.id必须是唯一的
-->
<mapper namespace="com.qfedu.pojo.TypeMapper">
    
    <select id="getTypesByTid" resultType="com.qfedu.pojo.Types">
      select * from types where tid = #{tid}
    </select>
</mapper>

  6. TestOrder.java

    package com.qfedu.test;

import com.qfedu.pojo.Order;
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.After;
import org.junit.Before;
import org.junit.Test;

import java.io.IOException;

public class TestOrders {

    private SqlSessionFactory sf = null;
    private SqlSession session = null;

    @Before
    public void setUp(){
        try {
            sf = new SqlSessionFactoryBuilder().build(Resources.getResourceAsStream("mybatis.xml"));

            session = sf.openSession();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @After
    public void tearDown(){
        if(session != null){
            session.close();
            session = null;
        }
    }

//    @Test
//    public void testSession(){
//        System.out.println(session);
//    }

    @Test
    public void testGetOrderByOid(){
        Order order = session.selectOne("com.qfedu.pojo.OrderMapper.getOrderByOid", "d44e970b629d11eaad320242ac110003");

        System.out.println(order);
    }
}

  7. 运行结果

    /Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/bin/java -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=50351:/Applications/IntelliJ IDEA.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath "/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar:/Applications/IntelliJ IDEA.app/Contents/plugins/junit/lib/junit-rt.jar:/Applications/IntelliJ IDEA.app/Contents/plugins/junit/lib/junit5-rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/lib/tools.jar:/Users/james/Documents/NZ1903/lesson/Days22Mybatis2/target/test-classes:/Users/james/Documents/NZ1903/lesson/Days22Mybatis2/target/classes:/Users/james/Documents/doc/repository/junit/junit/4.12/junit-4.12.jar:/Users/james/Documents/doc/repository/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar:/Users/james/Documents/doc/repository/mysql/mysql-connector-java/5.1.44/mysql-connector-java-5.1.44.jar:/Users/james/Documents/doc/repository/org/mybatis/mybatis/3.4.4/mybatis-3.4.4.jar" com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 -junit4 com.qfedu.test.TestOrders,testGetOrderByOid
Logging initialized using 'class org.apache.ibatis.logging.stdout.StdOutImpl' adapter.
Opening JDBC Connection
Wed Mar 11 11:34:57 CST 2020 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@79efed2d]
==>  Preparing: select * from orders where oid = ? 
==> Parameters: d44e970b629d11eaad320242ac110003(String)
<==    Columns: oid, price, addr, payType, uid
<==        Row: d44e970b629d11eaad320242ac110003, 30998, beijingxisanqi, zhibubao, 1
====>  Preparing: select * from users where uid = ? 
====> Parameters: 1(Integer)
<====    Columns: uid, name, pass, phone
<====        Row: 1, wukong, 888888, 13333333333
<====      Total: 1
====>  Preparing: select * from details where oid = ? 
====> Parameters: d44e970b629d11eaad320242ac110003(String)
<====    Columns: did, count, pid, oid
<====        Row: 35984c20629e11eaad320242ac110003, 2, 321607c2629b11eaad320242ac110003, d44e970b629d11eaad320242ac110003
======>  Preparing: select * from products where pid = ? 
======> Parameters: 321607c2629b11eaad320242ac110003(String)
<======    Columns: pid, name, img, price, tid
<======        Row: 321607c2629b11eaad320242ac110003, iphone x, iphone.jpg, 9999, dd6501cb628111eaad320242ac110003
========>  Preparing: select * from types where tid = ? 
========> Parameters: dd6501cb628111eaad320242ac110003(String)
<========    Columns: tid, name
<========        Row: dd6501cb628111eaad320242ac110003, digit
<========      Total: 1
<======      Total: 1
<====        Row: 569250ff629e11eaad320242ac110003, 1, ba23b88a629b11eaad320242ac110003, d44e970b629d11eaad320242ac110003
======>  Preparing: select * from products where pid = ? 
======> Parameters: ba23b88a629b11eaad320242ac110003(String)
<======    Columns: pid, name, img, price, tid
<======        Row: ba23b88a629b11eaad320242ac110003, yagao, heiren.jpg, 99, dd64fd48628111eaad320242ac110003
========>  Preparing: select * from types where tid = ? 
========> Parameters: dd64fd48628111eaad320242ac110003(String)
<========    Columns: tid, name
<========        Row: dd64fd48628111eaad320242ac110003, house
<========      Total: 1
<======      Total: 1
<====        Row: 56f00543629e11eaad320242ac110003, 1, f07de571628211eaad320242ac110003, d44e970b629d11eaad320242ac110003
======>  Preparing: select * from products where pid = ? 
======> Parameters: f07de571628211eaad320242ac110003(String)
<======    Columns: pid, name, img, price, tid
<======        Row: f07de571628211eaad320242ac110003, mac pro, mac.jpg, 21999, dd6501cb628111eaad320242ac110003
<======      Total: 1
<====      Total: 3
<==      Total: 1
Order{oid='d44e970b629d11eaad320242ac110003', price=30998.0, addr='beijingxisanqi', payType='zhibubao', u=User{uid=1, name='wukong', pass='888888', phone='13333333333'}, details=[Detail{did='35984c20629e11eaad320242ac110003', count=2, pro=Product{pid='321607c2629b11eaad320242ac110003', name='iphone x', img='iphone.jpg', price=9999.0, t=Types{tid=dd6501cb628111eaad320242ac110003, name='digit'}}}, Detail{did='569250ff629e11eaad320242ac110003', count=1, pro=Product{pid='ba23b88a629b11eaad320242ac110003', name='yagao', img='heiren.jpg', price=99.0, t=Types{tid=dd64fd48628111eaad320242ac110003, name='house'}}}, Detail{did='56f00543629e11eaad320242ac110003', count=1, pro=Product{pid='f07de571628211eaad320242ac110003', name='mac pro', img='mac.jpg', price=21999.0, t=Types{tid=dd6501cb628111eaad320242ac110003, name='digit'}}}]}
Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@79efed2d]
Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@79efed2d]

Process finished with exit code 0
zpz2001
发布了15 篇原创文章 · 获赞 30 · 访问量 6044
私信 关注

猜你喜欢

转载自blog.csdn.net/zpz2001/article/details/104793333
今日推荐
开源日报 | Chrome内置Gemini的意义不在于Gemini；中国AI追随之路的五大误区；ECharts创始人“下海”养鱼；谷歌I/O开发者大会什么都有，只是没有惊喜
微软回应中国区AI团队“打包赴美”传闻
基于大语言模型的开源知识库问答系统 MaxKB GitHub Star 数量突破 5,000 个！
美国拟限制 AI 大模型出口中国和俄罗斯
苹果将与 OpenAI 达成协议，将 ChatGPT 应用于 iPhone
openKylin 社区生态委员会第六次会议圆满召开
阿里云正式发布通义千问 2.5
Python 3.13 发布首个 Beta：实验性自由线程模式和 JIT、改进交互式解释器
Stack Overflow 拿我的代码去训练 AI 大模型，还封了我的账号
Pop!_OS 的 COSMIC 桌面完成 App Store 上架工作
《2024 年一季度互联网投融资运行情况》研究报告
报告：Django 仍然是 74% 开发者的首选
周排行
laravle中orm简单的增删改查
文本分类 特征选取之CHI开方检验
Spark核心编程-WordCount
大数据开发实战系列之电信客服(1)
读书笔记 - 把时间当作朋友 by 李笑来
python 笔记--if else
SpringBoot/Mybatis/Druid, 多数据源MultiDataSource配置思路
排序三个整数
redis集群搭建【2】-Windows中Redis集群搭建
STM32F030驱动TM1650点亮4联数码管
每日归档
更多
2024-05-16(6)
2024-05-15(24)
2024-05-14(0)
2024-05-13(18)
2024-05-12(0)
2024-05-11(38)
2024-05-10(38)
2024-05-09(35)
2024-05-08(42)
2024-05-07(14)

代码天地 © 2018 codetd.com

境外服务器   最新电视剧2022