利用mybatis怎么对数据库进行增删改查操作
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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（沿用前两节中的数据库表及数据）:
CREATE TABLE USER_TEST_TB( ID INT PRIMARY KEY, USERNAME VARCHAR(20) NOT NULL, PASSWORD VARCHAR(20) NOT NULL, NICKNAME VARCHAR(20) NOT NULL ); INSERT INTO USER_TEST_TB VALUES(1,'1st','111','Jack'); INSERT INTO USER_TEST_TB VALUES(2,'2nd','222','Rose'); INSERT INTO USER_TEST_TB VALUES(3,'3rd','333','Will');
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" ?>insert into USER_TEST_TB values(#{id},#{username},#{password},#{nickname}) update USER_TEST_TB set USERNAME = #{username}, PASSWORD = #{password}, NICKNAME = #{nickname} where ID = #{id} delete from USER_TEST_TB WHERE ID=#{id}
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 List getUser();
public void insertUser(User user);
public void updateUser(User user);
public void deleteUser(int userId);
} 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();
}
}
@Test
public void testInsert()
{
try
{
// 获取Session连接
SqlSession session = sqlSessionFactory.openSession();
// 获取Mapper
UserMapper userMapper = session.getMapper(UserMapper.class);
System.out.println("Test insert start...");
// 显示插入之前User信息
System.out.println("Before insert");
this.printUsers(userMapper.getUser());
// 执行插入
userMapper.insertUser(this.mockUser("FREU_INS_USER", "BJPOWERNODE_INS_PASS", "BJPOWERNODE_INS_NICK"));
// 提交事务
session.commit();
// 显示插入之后User信息
System.out.println("\r\nAfter insert");
this.printUsers(userMapper.getUser());
System.out.println("Test insert finished...");
}
catch (Exception e)
{
e.printStackTrace();
}
}
@Test
public void testUpdate()
{
try
{
// 获取Session连接
SqlSession session = sqlSessionFactory.openSession();
// 获取Mapper
UserMapper userMapper = session.getMapper(UserMapper.class);
System.out.println("Test update start...");
// 显示更新之前User信息
System.out.println("Before update");
this.printUsers(userMapper.getUser());
// 执行更新
userMapper.updateUser(this.mockUser("FREU_UPD_USER", "BJPOWERNODE_UPD_PASS", "BJPOWERNODE_UPD_NICK"));
// 提交事务
session.commit();
// 显示更新之后User信息
System.out.println("\r\nAfter update");
this.printUsers(userMapper.getUser());
System.out.println("Test update finished...");
}
catch (Exception e)
{
e.printStackTrace();
}
}
@Test
public void testDelete()
{
try
{
// 获取Session连接
SqlSession session = sqlSessionFactory.openSession();
// 获取Mapper
UserMapper userMapper = session.getMapper(UserMapper.class);
System.out.println("Test delete start...");
// 显示删除之前User信息
System.out.println("Before delete");
this.printUsers(userMapper.getUser());
// 执行删除
userMapper.deleteUser(this.mockUser(null, null, null).getId());
// 提交事务
session.commit();
// 显示删除之后User信息
System.out.println("\r\nAfter delete");
this.printUsers(userMapper.getUser());
System.out.println("Test delete finished...");
}
catch (Exception e)
{
e.printStackTrace();
}
}
/**
*
* 组装一个User对象
*
* @return
*/
public User mockUser(String username, String password, String nickname)
{
User user = new User();
user.setId(10);
user.setUsername(username);
user.setPassword(password);
user.setNickname(nickname);
return user;
}
/**
*
* 打印用户信息到控制台
*
* @param users
*/
private void printUsers(final List 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());
}
}
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