mybatis02（注解实现一对一的增删改查）

这时web.xml不需要配置

 

1.javaBean

package com.bean;

public class User {

 private Integer id;
 private String username;
 private String password;
 private Integer phone;
 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 Integer getPhone() {
  return phone;
 }
 public void setPhone(Integer phone) {
  this.phone = phone;
 }
 
}

2.log4j.properties

# Global logging configuration
log4j.rootLogger=ERROR, stdout
# MyBatis logging configuration...
log4j.logger.com.mapper=DEBUG
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

3.mybatis配置文件

4.数据库操作的类

package com.mapper;

import java.net.PasswordAuthentication;
import java.util.List;

import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.ResultMap;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import com.bean.User;

public interface UserMapper {

 @Insert("insert into user(username, password, phone) values(#{username},#{password},#{phone})")
 int addUser(User user);
 
 @Delete("delete from user where id=#{id}")
 int deleteUserById(int id);
 
 @Update("update user set username=#{username},password=#{password} where id=#{id}")
 int updateById(User user);
 
 @Select("select * from user")
 //id表示哪个字段是主键
 //column对应的数据库的字段名
 //property对应Java实体的属性名
 //如果两个都一致，可以不用配置,直接@Results({})
 @Results({
  @Result(id=true,property="id",column="id"),
  @Result(property="username",column="username"),
  @Result(property="password",column="password"),
  @Result(property="phone",column="phone")
 })
 List selectUser();
 
 @Select("select * from user where username like '%${value}%'")
 List selectUsersBylike(String username);
 
 //如果传递两个参数，就需要使用@Param对参数命名,其中@Param("")括号中的值必须跟sql语句中的一致
 @Select("select * from user where username=#{username} and password=#{password}")
 User selectUserBytwo(@Param("username")String username1,@Param("password")String password1);
}

5.增

package com.test;

import java.io.IOException;
import java.io.InputStream;

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.apache.tools.ant.types.CommandlineJava.SysProperties;
import org.junit.Test;

import com.bean.User;
import com.mapper.UserMapper;

public class Test1 {

 @Test
 public void add() throws IOException {
  
  //第一步 读取配置文件mybatis-config.xml
  InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
  //第二步 创建会话工厂
  SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
  //第三步 生成会话
  SqlSession session = sessionFactory.openSession();
  //第四步代理映射(获取mapper接口的代理对象)
  UserMapper userMapper=session.getMapper(UserMapper.class);
  
  User user=new User();
  user.setUsername("二狗子");
  user.setPassword("123456");
  user.setPhone(110);
  
  int i=userMapper.addUser(user);
  
  if(i>0)
   System.out.println("插入成功");
  else
   System.out.println("插入失败");
  session.commit();
  
  session.close();
 }
}

6.删

package com.test;

import java.io.IOException;
import java.io.InputStream;

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.Test;

import com.mapper.UserMapper;

public class Test2 {

 @Test
 public void delete() throws IOException
 {
  InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
  SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
  SqlSession session = sessionFactory.openSession();
  UserMapper userMapper=session.getMapper(UserMapper.class);
  
  int i=userMapper.deleteUserById(1);
  
  if(i>0)
   System.out.println("删除成功");
  else
   System.out.println("删除失败");
  session.commit();
  session.close();
 }
}

7.改

package com.test;

import java.io.IOException;
import java.io.InputStream;

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.Test;

import com.bean.User;
import com.mapper.UserMapper;

import javassist.expr.NewArray;

public class Test3 {

 @Test
 public void update() throws IOException
 {
  InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
  SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
  SqlSession session = sessionFactory.openSession();
  UserMapper userMapper=session.getMapper(UserMapper.class);
  
  User user=new User();
  user.setId(2);
  user.setUsername("指针");
  user.setPassword("1111111");
  int i=userMapper.updateById(user);
  
  if(i>0)
   System.out.println("修改成功");
  else
   System.out.println("修改失败");
  session.commit();
  session.close();
 }
 
}

8.查

package com.test;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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.Test;

import com.bean.User;
import com.mapper.UserMapper;

public class Test4 {

 @Test
 public void select() throws IOException
 {
  InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
  SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream); 
  SqlSession session = sessionFactory.openSession();
  //第四步代理映射
  UserMapper userMapper=session.getMapper(UserMapper.class);
  
  List users=userMapper.selectUser();
  for(User user:users)
  {
   System.out.print(user.getId()+"\t");
   System.out.print(user.getUsername()+"\t");
   System.out.print(user.getPassword()+"\t");
   System.out.println(user.getPhone());
  }
 }
 @Test
 public void selectUserByLike() throws IOException
 {
  InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
  SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream); 
  SqlSession session = sessionFactory.openSession();
  UserMapper userMapper=session.getMapper(UserMapper.class);
  
  List users=userMapper.selectUsersBylike("哈");
  for(User user:users)
  {
   System.out.print(user.getId()+"\t");
   System.out.print(user.getUsername()+"\t");
   System.out.print(user.getPassword()+"\t");
   System.out.println(user.getPhone());
  }
 }
 @Test
 public void selectUserBytwo() throws IOException
 {
  InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
  SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream); 
  SqlSession session = sessionFactory.openSession();
  UserMapper userMapper=session.getMapper(UserMapper.class);
  
  User user=userMapper.selectUserBytwo("哈哈", "1111111");
  
  System.out.print(user.getId()+"\t");
  System.out.print(user.getUsername()+"\t");
  System.out.print(user.getPassword()+"\t");
  System.out.println(user.getPhone());
 }
}