所需要用到的其他工具或技术:
项目管理工具 : Maven
测试运行工具 : Junit
数据库 : Derby
Maven Dependencies:
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<dependencies> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version> 3.2 . 7 </version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version> 4.9 </version> <scope>test</scope> </dependency> <dependency> <groupId>org.apache.derby</groupId> <artifactId>derby</artifactId> <version> 10.10 . 2.0 </version> </dependency> <dependency> <groupId>org.apache.derby</groupId> <artifactId>derbyclient</artifactId> <version> 10.10 . 2.0 </version> </dependency> </dependencies> |
SQL 建表及数据插入(新建一个USER_TEST_TB_RELATIONSHIP表,然后CopyUSER_TEST_TB的数据,Derby不支持表结构中列名的修改,只能这么做了):
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CREATE TABLE USER_TEST_TB_RELATIONSHIP( USER_ID INT PRIMARY KEY, USER_USERNAME VARCHAR( 20 ) NOT NULL, USER_PASSWORD VARCHAR( 20 ) NOT NULL, USER_NICKNAME VARCHAR( 20 ) NOT NULL ); INSERT INTO USER_TEST_TB_RELATIONSHIP(USER_ID,USER_USERNAME,USER_PASSWORD,USER_NICKNAME) SELECT ID,USERNAME,PASSWORD,NICKNAME FROM USER_TEST_TB; |
Mybatis配置文件 src/main/resource源目录下
test-mybatis-configuration.xml
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<?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" > <configuration> <properties> <property name= "driver" value= "org.apache.derby.jdbc.ClientDriver" /> <property name= "url" value= "jdbc:derby://localhost:1527/bjpowernode;create=true" /> </properties> <environments default = "development" > <environment id= "development" > <transactionManager type= "JDBC" /> <dataSource type= "POOLED" > <property name= "driver" value= "${driver}" /> <property name= "url" value= "${url}" /> </dataSource> </environment> </environments> <mappers> <mapper resource= "com/bjpowernode/practice/UserMapper.xml" /> </mappers> </configuration> |
User.java对象类(src/main/java/com/bjpowernode/practice目录下)
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package com.bjpowernode.practice; public class User { private Integer id; private String username; private String password; private String nickname; public Integer getId() { return id; } public void setId(Integer id) { this .id = id; } public String getUsername() { return username; } public void setUsername(String username) { this .username = username; } public String getPassword() { return password; } public void setPassword(String password) { this .password = password; } public String getNickname() { return nickname; } public void setNickname(String nickname) { this .nickname = nickname; } } |
UserMapper.xml Mapper文件(src/main/java/com.bjpowernode.practice目录下)
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<?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.bjpowernode.practice.UserMapper" > <!-- 对象属性和表字段的对应 --> <resultMap id= "userResultMap" type= "com.bjpowernode.practice.User" > <result property= "id" column= "USER_ID" /> <result property= "username" column= "USER_USERNAME" /> <result property= "password" column= "USER_PASSWORD" /> <result property= "nickname" column= "USER_NICKNAME" /> </resultMap> <select id= "getUser" resultMap= "userResultMap" > select * from USER_TEST_TB_RELATIONSHIP </select> </mapper> |
UserMapper.java Mapper类(src/main/java/com.bjpowernode.practice目录下)
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package com.bjpowernode.practice; import java.util.List; public interface UserMapper { public List<User> getUser(); } |
测试类TestMyBatis.Java(src/test/java/com.bjpowernode.practice目录下)
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package com.bjpowernode.practice; import java.io.InputStream; import java.text.MessageFormat; import java.util.List; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import org.junit.Before; import org.junit.Test; public class TestMyBatis { private String source; private InputStream inputStream; private SqlSessionFactory sqlSessionFactory; @Before public void setUp() { /** * 准备Mybatis运行环境 */ source = "test-mybatis-configuration.xml" ; inputStream = TestMyBatis. class .getClassLoader().getResourceAsStream(source); sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); } @Test public void testGet() { try { // 获取Session连接 SqlSession session = sqlSessionFactory.openSession(); // 获取Mapper UserMapper userMapper = session.getMapper(UserMapper. class ); // 显示User信息 System.out.println( "Test Get start..." ); this .printUsers(userMapper.getUser()); System.out.println( "Test Get finished..." ); } catch (Exception e) { e.printStackTrace(); } } /** * * 打印用户信息到控制台 * * @param users */ private void printUsers( final List<User> users) { int count = 0 ; for (User user : users) { System.out.println(MessageFormat.format( "==User[{0}]=================" , ++count)); System.out.println( "User Id: " + user.getId()); System.out.println( "User UserName: " + user.getUsername()); System.out.println( "User Password: " + user.getPassword()); System.out.println( "User nickname: " + user.getNickname()); } } } |
总结
以上所述是小编给大家介绍的mybatis实现表与对象的关联关系_动力节点Java学院整理,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!