IDEA完整搭建mybatis（一）

1.使用idea搭建mybatis—基于接口
新建maven工程，然后在pom.xml导入依赖。

    
    
        mysql
        mysql-connector-java
        6.0.6
    
    
    
        org.mybatis
        mybatis
        3.4.6
    

2.mybtis 的工作流程

//加载配置文件，sqlsessionFactorybuilder创建sqlsessionfactory对象

Reader reader = Resources.getResourceAsReader("config/mybatis-conf.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);

//1.创建sqlsessionFactory
SqlSessionFactory sqlSessionFactory = DBtools.getSqlSessionFactory();

//2.创建SqlSession
SqlSession session = sqlSessionFactory.openSession();

//3.session 中创建相应的接口代理类，即mapper对象
UserBeanMapper userBeanMapper = session.getMapper(UserBeanMapper.class);

3.整个工程如下

配置mybatis的配置文件mybatis-conf.xml:

mysql.properties

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

userMapper.xml

    
        
        
        
    
    
        select * from user where name=#{name}
    
    
      select * from user
    

    
      insert into user values(#{id},#{name},#{age})
    

    
        delete from user where name=#{name}
    

    
        update user set name=#{name},set age=#{age} where id=#{id}
    

UserBean.java

package com.jun.entity;

/**
 * @author jun
 * @date 2019/1/31
 */
public class UserBean {

    private int id;
    private String name;
    private int age;

    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 int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

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

}

DBtools.java工具类创建sqlsessionfactory

package com.jun;

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

import java.io.IOException;
import java.io.Reader;

/**
 * @author jun
 * @date 2019/1/31
 */
public class DBtools {

    private static SqlSessionFactory sqlSessionFactory;
    static {
        try {
            Reader reader = Resources.getResourceAsReader("config/mybatis-conf.xml");
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public static SqlSessionFactory getSqlSessionFactory(){
        return sqlSessionFactory;
    }

}

UserBeanMapper.java

package com.jun.dao;

import com.jun.entity.UserBean;

import java.util.List;

/**
 * @author jun
 * @date 2019/1/31
 */
public interface UserBeanMapper {

    UserBean queryUserByName(String name);

    List queryAll();

    int insertUser(UserBean userBean);

    int deleteUserByName(String name);

    int updateUserById(UserBean userBean,int id);
}

进行验证

    public static void main(String[] args){
       //1.创建sqlsessionFactory
        SqlSessionFactory sqlSessionFactory = DBtools.getSqlSessionFactory();
        //2.创建SqlSession
        SqlSession session = sqlSessionFactory.openSession();
        //3.session 中创建相应的接口代理类，即mapper对象
        UserBeanMapper userBeanMapper = session.getMapper(UserBeanMapper.class);
        System.out.println(userBeanMapper.queryAll());
        try {
            System.out.println(userBeanMapper.deleteUserByName("jun"));
            UserBean u1 = new UserBean();
            u1.setAge(28);
            u1.setName("king");
            u1.setId(3);
            System.out.println(userBeanMapper.insertUser(u1));
            session.commit();//一定要提交，不然所有增删改操作不会生效的
            System.out.println(userBeanMapper.queryAll());
        }catch (Exception e){
            session.rollback();//回滚
        }
    }

4.结合ssm整合来看，mybatis提供了一个整合包，来整合，不过原理大概也是这样子的。都是用sqlsessionfactory来进行持久化。
以上内容，有些是看到别人写的，加上自己也开始学，先记下笔记，也方便后来人看。
http://www.mybatis.org/mybatis-3/zh/configuration.html#typeAliases
详细请看官网更加好。