mybatis04（注解实现一对一动态sql 的增删改查）

其他 2018-09-29 06:39:41 阅读次数: 0
版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/ITw333/article/details/79517765

注：在此文章中加了 jdbc.properties文件，用于设置连接数据库时的一些变量的值

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.jdbc.properties（对一些变量的设置）

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/mybatis
username=root
password=123456

4.mybatis配置文件

<?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">
   
    <!--1.配置环境 ，默认的环境id为mysql-->
 <configuration>
 
  <!-- 导入 jdbc.properties 引用里面的值-->
  <properties resource="jdbc.properties"/>
  
  <!-- 1.指定mybatis所用日志的具体实现 -->
  <settings>
   <setting name="logImpl" value="LOG4j"/>
  </settings>
  <!-- 起别名  -->
  <typeAliases>
   <typeAlias type="com.bean.User" alias="User"/>
   <!-- 自动在包名下搜索javabean并起别名为 类名的首字母小写 -->
   <!--  <package name="com.bean"/> -->
  </typeAliases>
  <!--2.配置环境 ，默认的环境id为mysql-->
  <environments default="mysql">
   <!--2.2.配置id为mysql的数据库环境 -->
   <environment id="mysql">
    <!-- 2.2.1使用JDBC的事务管理   使用了JDBC的提交和回滚设置-->
    <transactionManager type="JDBC"></transactionManager>
    <!--2.2.2数据库连接池   POOLED是JDBC连接对象的数据源连接池的实现 -->
    <dataSource type="POOLED">
     <property name="driver" value="${driver}"/>
     <property name="url" value="${url}"/>
     <property name="username" value="${username}"/>
     <property name="password" value="${password}"/>
    </dataSource>
   </environment>
  </environments>
  
  <!--3.配置Mapper的位置 -->
  <mappers>
   <mapper class="com.mapper.UserMapper"/>
   <!-- 使用本地文件 -->
   <!-- <mapper url="file:///D:/java/workspaces/mybatis0/src/com/mapper/UserMapper.xml"/> -->
  </mappers>
 </configuration>

5.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.DeleteProvider;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.InsertProvider;
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.SelectProvider;
import org.apache.ibatis.annotations.Update;
import org.apache.ibatis.annotations.UpdateProvider;

import com.bean.User;

public interface UserMapper {

 @InsertProvider(type=UserMapperProvider.class,method="insertUser")
 int addUser(User user);
 
 @DeleteProvider(type=UserMapperProvider.class,method="deleteUser")
 int deleteUserById(@Param("index")int id);
 
 @UpdateProvider(type=UserMapperProvider.class,method="updateUser")
 int updateById(User user);
 
 @SelectProvider(type=UserMapperProvider.class,method="selectAll")
 List<User> selectUser(User user);
 
 @SelectProvider(type=UserMapperProvider.class,method="selectLikeUser")
 List<User> selectUsersBylike(@Param("name")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);
}

6.数据库操作时关联的类

package com.mapper;

import java.util.Map;

import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.jdbc.SQL;
import org.apache.tools.ant.types.CommandlineJava.SysProperties;

import com.bean.User;

public class UserMapperProvider {



 public String insertUser(final User user) {
  return new SQL(){
   {
    INSERT_INTO("user");
    if (user.getUsername()!=null && user.getUsername()!="")
    {
     VALUES("username",user.getUsername());
    }
    if (user.getPassword()!=null && user.getPassword()!="")
    {
     VALUES("password",user.getPassword());
    }
    if (user.getPhone()!=null && user.getPhone().toString()!="")
    {
     VALUES("phone",user.getPhone().toString());
    }
   }
  }.toString();
 }
 public String deleteUser(final Map<String,Integer> para) {
  SQL sql=new SQL(){
   {
    DELETE_FROM("user");
    WHERE("id=#{index}");
   }
  };
  System.out.println(sql);
  return sql.toString();
 }
 public String updateUser(final User user) {
  SQL sql=new SQL(){
   {
    UPDATE("user");
    if(user.getUsername()!=null&&user.getUsername()!="")
     SET("username=#{username}");
    if(user.getPassword()!=null && user.getPassword()!="")
     SET("password=#{password}");
   }
  };
  return sql.toString();
 }
 public String selectAll(final User user) {
  return new SQL(){
   {
    SELECT("*");
    FROM("user");
    if (user.getUsername()!=null && user.getUsername()!="")
    {
     WHERE("username=#{username}");
    }
   }
  }.toString();
  //另一种写法：
  /*String sql="";
  sql+="select * from user where 1=1 ";
  if (user.getUsername()!=null && user.getUsername()!="")
  {
   sql+="and username=#{username}";
  }
  return sql;*/
 }
 public String selectLikeUser(final Map<String,String> username) {
  return new SQL(){
   {
    SELECT("*");
    FROM("user");
    if(username.get("name")!=null &&username.get("name")!="")
     WHERE("username like concat('%',#{name},'%')");
   }
  }.toString();
 }
}

 

7.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();
 }
}

8.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(3);
  
  if(i>0)
   System.out.println("删除成功");
  else
   System.out.println("删除失败");
  session.commit();
  session.close();
 }
}

9.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(4);
  user.setUsername("哈哈哈哈");
  user.setPassword("111111");
  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();
 }
 
}

10.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);
  User user2=new User();
  user2.setUsername("哈哈哈哈");
  List<User> users=userMapper.selectUser(user2);
  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<User> users=userMapper.selectUsersBylike("玉");
  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("二狗子", "1111111");
  
  System.out.print(user.getId()+"\t");
  System.out.print(user.getUsername()+"\t");
  System.out.print(user.getPassword()+"\t");
  System.out.println(user.getPhone());
 }
}

猜你喜欢

转载自blog.csdn.net/ITw333/article/details/79517765
今日推荐
《美国对全球网络空间安全与发展的威胁和破坏》报告发布
火速冲上 GitHub 热榜 —— 开源编程语言、框架哪有这么可爱？
北京人形机器人创新中心发布全球首个纯电驱拟人奔跑的全尺寸人形机器人“天工”
LFOSSA 源来如此公开课 | 掌握云原生未来：CNCF 认证全面攻略与备考秘籍
国产云输入法——仅华为无云端数据上传安全问题
周排行
Python环境安装与基础语法（1）——计算机基础知识
IMU预积分
ADAS中的LDW、FCW、BSD、LCA、ACC、AEB、APA、DMS代表的含义
B站笔试两道题
skyeye arm 硬件虚拟机环境的搭建
Web前端静态页面示例
数组-合并排序数组 II-简单
springcloud之版本问题启动报错
面向对象-------------匿名对象(六)
输入URL到页面呈现中间发生了什么？
每日归档
更多
2024-04-30(1)
2024-04-29(40)
2024-04-28(0)
2024-04-27(56)
2024-04-26(39)
2024-04-25(22)
2024-04-24(36)
2024-04-23(26)
2024-04-22(39)
2024-04-21(0)

代码天地 © 2018 codetd.com

境外服务器   最新电视剧2022