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使用Mybatis如何实现对数据库进行增删改查操作

本篇文章为大家展示了使用Mybatis如何实现对数据库进行增删改查操作,内容简明扼要并且容易理解,绝对能使你眼前一亮,通过这篇文章的详细介绍希望你能有所收获。

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什么是 MyBatis?

MyBatis 是支持普通 SQL 查询,存储过程和高级映射的优秀持久层框架。 MyBatis 消除了几乎所有的 JDBC 代码和参数的手工设置以及对结果集的检索。MyBatis 可以使用简单的XML 或注解用于配置和原始映射,将接口和 Java 的 POJO(Plain Old Java Objects,普通的Java对象)映射成数据库中的记录。

Mybatis实例

对一个User表的CRUD操作:

User表:

-- ----------------------------
-- Table structure for `user`
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `userName` varchar(50) DEFAULT NULL,
 `userAge` int(11) DEFAULT NULL,
 `userAddress` varchar(200) DEFAULT NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', 'summer', '30', 'shanghai');
INSERT INTO `user` VALUES ('2', 'test2', '22', 'suzhou');
INSERT INTO `user` VALUES ('3', 'test1', '29', 'some place');
INSERT INTO `user` VALUES ('4', 'lu', '28', 'some place');
INSERT INTO `user` VALUES ('5', 'xiaoxun', '27', 'nanjing');

在Src目录下建一个mybatis的xml配置文件Configuration.xml

<?xml version="1.0" encoding="UTF-8" ?>


  
   
     
   

  
    
    
      
      
      
      
      
      
    
  
  
  
  
    
  

定义User mappers的User.xml配置文件

<?xml version="1.0" encoding="UTF-8" ?>




  
  
  
  
  
  
  
  
  
  
  
   
   
    insert into user(userName,userAge,userAddress) 
       values(#{userName},#{userAge},#{userAddress}) 
  
  
  
    update user set userName=#{userName},userAge=#{userAge},userAddress=#{userAddress} where id=#{id}
  
  
  
    delete from user where id=#{id}
  
  

配置文件实现了接口和SQL语句的映射关系。selectUsersByName采用了2种方式实现,注释掉的也是一种实现,采用resultMap可以把属性和数据库列名映射关系定义好,property为类的属性,column是表的列名,也可以是表列名的别名!

User类的定义:

package com.mybatis.test;

public class User {
  
  private int id;
  private String userName;
  private int userAge;
  private String userAddress;
  
  public int getId() {
    return id;
  }
  
  public void setId(int id) {
    this.id = id;
  }
  
  public String getUserName() {
    return userName;
  }
  
  public void setUserName(String userName) {
    this.userName = userName;
  }
  
  public int getUserAge() {
    return userAge;
  }
  
  public void setUserAge(int userAge) {
    this.userAge = userAge;
  }
  
  public String getUserAddress() {
    return userAddress;
  }
  
  public void setUserAddress(String userAddress) {
    this.userAddress = userAddress;
  }
  
  @Override
  public String toString(){
    return this.userName+" "+this.userAge+" "+this.userAddress;
  }

}

IUserOperaton定义:

package com.mybatis.test;

import java.util.List;

public interface IUserOperation {
  
  public User selectUserByID(int id);
  
  public List selectUsersByName(String userName);
  
  public void addUser(User user);
  
  public void updateUser(User user);
  
  public void deleteUser(int id);
  
}

IUserOperation为操作接口,函数名和mybatis的xml配置文件中的操作id名对应。

测试类Test:

package com.mybatis.test;

import java.io.Reader;
import java.util.List;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class Test {

  private static SqlSessionFactory sqlSessionFactory;
  private static Reader reader;

  static {
    try {
      reader = Resources.getResourceAsReader("Configuration.xml");
      sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  public static SqlSessionFactory getSession() {
    return sqlSessionFactory;
  }

  public void getUserByID(int userID) {
    SqlSession session = sqlSessionFactory.openSession();
    try {
      IUserOperation userOperation = session
          .getMapper(IUserOperation.class);
      User user = userOperation.selectUserByID(userID);
      if (user != null) {
        System.out.println(user.getId() + ":" + user.getUserName()
            + ":" + user.getUserAddress());
      }

    } finally {
      session.close();
    }
  }

  public void getUserList(String userName) {
    SqlSession session = sqlSessionFactory.openSession();
    try {
      IUserOperation userOperation = session
          .getMapper(IUserOperation.class);
      List users = userOperation.selectUsersByName(userName);
      for (User user : users) {
        System.out.println(user.getId() + ":" + user.getUserName()
            + ":" + user.getUserAddress());
      }

    } finally {
      session.close();
    }
  }

  /**
   * 增加后要commit
   */
  public void addUser() {
    User user = new User();
    user.setUserAddress("place");
    user.setUserName("test_add");
    user.setUserAge(30);
    SqlSession session = sqlSessionFactory.openSession();
    try {
      IUserOperation userOperation = session
          .getMapper(IUserOperation.class);
      userOperation.addUser(user);
      session.commit();
      System.out.println("新增用户ID:" + user.getId());
    } finally {
      session.close();
    }
  }

  /**
   * 修改后要commit
   */
  public void updateUser() {
    SqlSession session = sqlSessionFactory.openSession();
    try {
      IUserOperation userOperation = session
          .getMapper(IUserOperation.class);
      User user = userOperation.selectUserByID(1);
      if (user != null) {
        user.setUserAddress("A new place");
        userOperation.updateUser(user);
        session.commit();
      }
    } finally {
      session.close();
    }
  }

  /**
   * 删除后要commit.
   * 
   * @param id
   */
  public void deleteUser(int id) {
    SqlSession session = sqlSessionFactory.openSession();
    try {
      IUserOperation userOperation = session
          .getMapper(IUserOperation.class);
      userOperation.deleteUser(id);
      session.commit();
    } finally {
      session.close();
    }
  }

  public static void main(String[] args) {
    try {
      Test test = new Test();
      // test.getUserByID(1);
      // test.getUserList("test1");
      // test.addUser();
      // test.updateUser();
      // test.deleteUser(6);

    } catch (Exception e) {
      System.out.println(e.getMessage());
    }
  }

}

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