创建第一个Mybatis项目

使用环境:

MySQL:Maven:配置Mybatis环境：创建项目：

jdk1.8
MySQL5.6
maven3.3.6

创建一个Maven项目

配置maven仓库


导入使用的jar包

    4.0.0

    com.kuang
    Myabtis-Study
    pom
    1.0-SNAPSHOT
    
        Mybatis-01
    

    
        8
        8
    
    
        
            mysql
            mysql-connector-java
            5.1.47
        
        
            org.mybatis
            mybatis
            3.5.6
        
        
            junit
            junit
            4.12

        
    

    
        
            
                src/main/java
                
                    ***.properties
                
                true 
            

            
                src/main/resources
                
                    ***.properties
                
            
        
    

创建Mybatis配置文件resources–>mybatis-config.xml

创建调用mybatis-config.xml的类mybatisutils

package utils;

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

public class Mybatisutils {

    //使用mybatis获取sqlSessionFactory对象


    private static SqlSessionFactory sqlSessionFactory;

    static {
        try {
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    //既然有了 SqlSessionFactory，顾名思义，我们可以从中获得 SqlSession 的实例。
    // SqlSession 提供了在数据库执行 SQL 命令所需的所有方法
    public static SqlSession getSqlSession() {
        return sqlSessionFactory.openSession();


    }
}

创建实体类方法User

package kuang;

public class User {
    private int id;
    private String name;
    private String pwd;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    public User() {
    }

    public User(int id, String name, String pwd) {
        this.id = id;
        this.name = name;
        this.pwd = pwd;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + ''' +
                ", pwd='" + pwd + ''' +
                '}';
    }
}

编写实体类接口UserMapper

package kuang;
import kuang.User;
import java.util.List;
import java.util.Map;

public interface UserMapper {
    //模糊查询
    List getUserLike(String name);
    //map查询
//    int addUser2(Map map);



    //获取全部用户
    List getUserList();
    //根据id查询用户
    User getUserById(int id);
    //insert一个用户
    int addUser(User user);
    //修改用户
    int updateUser(User user);
    //删除用户
    int deleteUser(int id);




}

编写实体类接口的实现类UserMapper.xml

    
        select *
        from mybatis.user;
    


    
        select *
        from mybatis.user
        where id = #{id}
    

    
        insert into mybatis.user (id, name, pwd)
        values (#{id}, #{name}, #{pwd});

    
    
        update mybatis.user
        set name = #{name},
            pwd=#{pwd}
        where id = #{id};

    

    
        delete
        from mybatis.user
        where id = #{id};

    

    
        select *
        from mybatis.user
        where name like #{value};

    

    
            insert into mybatis.user (id,pwd) values (#{userid},#{password});
    

创建测试类UserDaoTest

package kuang;

import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
import utils.Mybatisutils;
import kuang.User;

import java.util.HashMap;
import java.util.List;
import java.util.Map;


public class UserDaoTest {
    @Test
    public void getUserlike(){
        //获得SqlSession对象
        SqlSession sqlSession = Mybatisutils.getSqlSession();
        //执行sql
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List userLike = mapper.getUserLike("%李%");
        for (User user : userLike){
            System.out.println(user);
        }

        sqlSession.close();

    }



    @Test
    public void test() {
        //获得SqlSession对象
        SqlSession sqlSession = Mybatisutils.getSqlSession();
        //执行sql
        UserMapper userDao = sqlSession.getMapper(UserMapper.class);
        List userList = userDao.getUserList();
        for (User user : userList) {
            System.out.println(user);
        }
        sqlSession.close();


    }

    @Test
    public void getUserById() {
        SqlSession sqlSession = Mybatisutils.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        User user = mapper.getUserById(1);
        System.out.println(user);

        sqlSession.close();

    }

    //增删改需要提交事务
    @Test
    public void addUser() {
        SqlSession sqlSession = Mybatisutils.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);

        int res = mapper.addUser(new User(4, "哈哈", "123456"));
        if (res > 0) {
            System.out.println("插入成功");
        }
        sqlSession.commit();
        sqlSession.close();
    }

    @Test
    public void updateUser() {
        SqlSession sqlSession = Mybatisutils.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);

        mapper.updateUser(new User(2, "鹿鸣", "889977"));

        sqlSession.commit();
        sqlSession.close();
    }

    @Test
    public void deleterUser() {
        SqlSession sqlSession = Mybatisutils.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        mapper.deleteUser(3);

        sqlSession.commit();
        sqlSession.close();


    }
  



}

测试成功！！！

-------狂神说&鹿鸣