Mybatis 学习笔记四 MyBatis-Plus插件

maven依赖

                
     
      com.baomidou
                 
     
      mybatis-plus
                 
     
      3.0.5
             
            
                
     
      org.apache.velocity
                 
     
      velocity-engine-core
                 
     
      2.0
             
            
                
     
      org.freemarker
                 
     
      freemarker
                 
     
      2.3.28
             
            
                
     
      org.projectlombok
                 
     
      lombok
                 
     
      1.18.4
                 
     
      provided
             
    

配置

mybatis配置

conf.xml

注意：保持基本配置即可；

spring配置

applicationContext.xml

mapper配置

userMapper.xml

    
    
        
         
     		select * from users where id = #{id}	    
     		select * from users	
    

meng.mybatis.test.UserMapper类

import com.baomidou.mybatisplus.core.mapper.BaseMapper;import java.util.List;public interface UserMapper extends BaseMapper
    
      {    List
     
       findUsers();    User findUserByUserid(int id);}
     
    

实体类

User.java

import com.baomidou.mybatisplus.annotation.TableField;import com.baomidou.mybatisplus.annotation.TableName;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;import lombok.ToString;@TableName("users")@Data@NoArgsConstructor@AllArgsConstructor@ToStringpublic class User {	private int id;	private String name;	private int age;	@TableField(value = "stu_id")	private String stuId;}

测试

ApplicationContext context = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");        UserMapper userMapper = context.getBean(UserMapper.class);        User user =  userMapper.selectById(1);        System.out.println(user]");

源码