Java基础-SSM之mybatis一对一关联

　　　　　　　　　　　　　　Java基础-SSM之mybatis一对一关联

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　作者：尹正杰

版权声明：原创作品，谢绝转载！否则将追究法律责任。

 

 

 

一.准备测试环境（创建数据库表）

 1>.创建husbands和wifes表并建立关联关系（外键约束） 

use yinzhengjie;

create table husbands(id int primary key auto_increment , hname varchar(20)) ;
        
create table wifes(id int primary key , hname varchar(20)) ;

alter table wifes add constraint fk_id foreign key (id) references husbands(id) ;

2>.添加Maven依赖

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0"
 3          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5     <modelVersion>4.0.0</modelVersion>
 6     <groupId>cn.org.yinzhengjie</groupId>
 7     <artifactId>Mybatis</artifactId>
 8     <version>1.0-SNAPSHOT</version>
 9     <dependencies>
10         <dependency>
11             <groupId>junit</groupId>
12             <artifactId>junit</artifactId>
13             <version>4.11</version>
14         </dependency>
15         <dependency>
16             <groupId>mysql</groupId>
17             <artifactId>mysql-connector-java</artifactId>
18             <version>5.1.17</version>
19         </dependency>
20         <dependency>
21             <groupId>org.mybatis</groupId>
22             <artifactId>mybatis</artifactId>
23             <version>3.2.1</version>
24         </dependency>
25     </dependencies>
26 </project>

3>.目录结构如下：

 

 

二.编写自定义类

1>.Husband.java 文件内容

 1 /*
 2 @author :yinzhengjie
 3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
 4 EMAIL:y1053419035@qq.com
 5 */
 6 package cn.org.yinzhengjie.mybatis.domain.one2one;
 7 
 8 public class Husband {
 9     private Integer id ;
10     private String hname ;
11     private Wife wife ;
12 
13     public Integer getId() {
14         return id;
15     }
16 
17     public void setId(Integer id) {
18         this.id = id;
19     }
20 
21     public String getHname() {
22         return hname;
23     }
24 
25     public void setHname(String hname) {
26         this.hname = hname;
27     }
28 
29     public Wife getWife() {
30         return wife;
31     }
32 
33     public void setWife(Wife wife) {
34         this.wife = wife;
35     }
36 }

2>.Wife.java 文件内容

 1 /*
 2 @author :yinzhengjie
 3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
 4 EMAIL:y1053419035@qq.com
 5 */
 6 package cn.org.yinzhengjie.mybatis.domain.one2one;
 7 
 8 public class Wife {
 9     private String wname ;
10     private Husband husband ;
11 
12     public String getWname() {
13         return wname;
14     }
15 
16     public void setWname(String wname) {
17         this.wname = wname;
18     }
19 
20     public Husband getHusband() {
21         return husband;
22     }
23 
24     public void setHusband(Husband husband) {
25         this.husband = husband;
26     }
27 }

 

三.编写配置文件

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 
 3 <!DOCTYPE configuration
 4         PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 5         "http://mybatis.org/dtd/mybatis-3-config.dtd">
 6 <configuration>
 7     <properties>
 8         <property name="driver" value="com.mysql.jdbc.Driver"/>
 9         <!--注意 : “?characterEncoding=utf-8&amp;autoReconnect=true&amp;failOverReadOnly=false&amp;allowMultiQueries=true” 表示开启批处理模式-->
10         <property name="url" value="jdbc:mysql://localhost:5200/yinzhengjie?characterEncoding=utf-8&amp;autoReconnect=true&amp;failOverReadOnly=false&amp;allowMultiQueries=true"/>
11         <property name="username" value="root"/>
12         <property name="password" value="yinzhengjie"/>
13     </properties>
14 
15     <!-- 我们使用typeAliases标签给我们自定义类起个别名。-->
16     <typeAliases>
17         <typeAlias type="cn.org.yinzhengjie.mybatis.domain.one2one.Husband"     alias="_Husband" />
18         <typeAlias type="cn.org.yinzhengjie.mybatis.domain.one2one.Wife"        alias="_Wife" />
19     </typeAliases>
20 
21     <environments default="development">
22         <environment id="development">
23             <transactionManager type="JDBC"/>
24             <dataSource type="POOLED">
25                 <property name="driver" value="${driver}"/>
26                 <property name="url" value="${url}"/>
27                 <property name="username" value="${username}"/>
28                 <property name="password" value="${password}"/>
29             </dataSource>
30         </environment>
31     </environments>
32     <mappers>
33         <!-- 我们使用mapper标签指定映射文件，使用resource指定具体的路径，如果没有写绝对路径，默认的根路径就在resources目录中-->
34         <mapper resource="HusbandMapper.xml"/>
35         <mapper resource="WifeMapper.xml"/>
36     </mappers>
37 </configuration>
mybatis-config.xml 文件内容
 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 3         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 4 <!-- 定义名字空间 -->
 5 <mapper namespace="husbands">
 6     <insert id="insert" useGeneratedKeys="true" keyProperty="id">
 7         insert into husbands(hname) values(#{hname}) ;
 8     </insert>
 9 
10 </mapper>
HusbandMapper.xml 文件内容
1 <?xml version="1.0" encoding="UTF-8" ?>
2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
3         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
4 <!-- 定义名字空间 -->
5 <mapper namespace="wifes">
6     <insert id="insert">
7         insert into wifes(id , hname) values(#{husband.id} , #{wname}) ;
8     </insert>
9 </mapper>
WifeMapper.xml 文件内容

 

四.编写测试代码

 1 /*
 2 @author :yinzhengjie
 3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
 4 EMAIL:y1053419035@qq.com
 5 */
 6 package cn.org.yinzhengjie.mybatis.test;
 7 
 8 import cn.org.yinzhengjie.mybatis.domain.one2one.Husband;
 9 import cn.org.yinzhengjie.mybatis.domain.one2one.Wife;
10 import org.apache.ibatis.io.Resources;
11 import org.apache.ibatis.session.SqlSession;
12 import org.apache.ibatis.session.SqlSessionFactory;
13 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
14 import org.junit.Test;
15 
16 import java.io.InputStream;
17 
18 /**
19  * 测试一对一
20  */
21 public class TestOne2One {
22     @Test
23     public void testInsert() throws Exception {
24         InputStream in = Resources.getResourceAsStream("mybatis-config.xml");
25         SqlSessionFactory sf = new SqlSessionFactoryBuilder().build(in);
26         SqlSession sess = sf.openSession();
27 
28         Husband h1 = new Husband();
29         h1.setHname("zhangjie");
30         Wife w1 = new Wife();
31         w1.setWname("xiena");
32         h1.setWife(w1);
33         w1.setHusband(h1);
34         sess.insert("husbands.insert" , h1) ;
35         sess.insert("wifes.insert" , w1) ;
36         sess.commit();
37         sess.close();
38         System.out.println("插入成功");
39     }
40 
41 }

 　　运行以上代码查看数据库内容如下：

 

posted @ 2018-07-10 09:41  尹正杰  阅读(366)  评论(0)  编辑  收藏  举报