利用mybatis怎么将表与对象进行关联
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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:
org.mybatis mybatis 3.2.7 junit junit 4.9 test org.apache.derby derby 10.10.2.0 org.apache.derby derbyclient 10.10.2.0
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):
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
<?xml version="1.0" encoding="UTF-8" ?>
User.java对象类(src/main/java/com/bjpowernode/practice目录下)
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)
<?xml version="1.0" encoding="UTF-8" ?>
UserMapper.java Mapper类(src/main/java/com.bjpowernode.practice目录下)
package com.bjpowernode.practice; import java.util.List; public interface UserMapper { public ListgetUser(); }
测试类TestMyBatis.Java(src/test/java/com.bjpowernode.practice目录下)
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 Listusers) { 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()); } } }
以上就是利用mybatis怎么将表与对象进行关联,小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。
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