springboot+mybatisplus+maven环境搭建

mybatisplus：是Mybatis的一个增强版，使得mybatis能够更高效的开发，他集结了hibernate和mybatis的优点。这里简称mp,能够自动生成常用的sql语句，大大提高开发效率。

于是乎跟着官网的提示操作，项目发现根本没有跑起来。经过一翻折腾，总算跑起来了，官网的配置还是有些坑的，这里把我的配置分享一下。

POM.XML配置：

    4.0.0

    
        
            central
            http://maven.aliyun.com/nexus/content/groups/public/
            aliyun
        
    
    com.example
    demo
    0.0.1-SNAPSHOT
    jar

    demo
    Demo project for Spring Boot

    
        org.springframework.boot
        spring-boot-starter-parent
        2.0.2.RELEASE
         
    

    
        UTF-8
        UTF-8
        1.8
        5.1.46
        1.0.9
    

    
        
            org.springframework.boot
            spring-boot-starter-web
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            org.springframework.boot
            spring-boot-configuration-processor
            true
        

        
        
            mysql
            mysql-connector-java
            ${mysql.version}
        
        
        
            com.alibaba
            druid
            ${druid.version}
        

        
        
            org.apache.velocity
            velocity
            1.7
        
        
            com.baomidou
            mybatisplus-spring-boot-starter
            1.0.4
        
        
            com.baomidou
            mybatis-plus
            2.1.5
        
        
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            1.3.1
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

在项目目录下新建一个config包，把这个配置类放进去：

package com.example.demo.configuration;

import com.baomidou.mybatisplus.plugins.PaginationInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@MapperScan("com.example.demo.dao")
public class MybatisPlusConfig {
    /*
     * 分页插件，自动识别数据库类型
     * 多租户，请参考官网【插件扩展】
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }

   /*
    * oracle数据库配置JdbcTypeForNull
    * 参考：https://gitee.com/baomidou/mybatisplus-boot-starter/issues/IHS8X
    不需要这样配置了，参考 yml:
    mybatis-plus:
      confuguration
        dbc-type-for-null: 'null'
   @Bean
   public ConfigurationCustomizer configurationCustomizer(){
       return new MybatisPlusCustomizers();
   }

   class MybatisPlusCustomizers implements ConfigurationCustomizer {

       @Override
       public void customize(org.apache.ibatis.session.Configuration configuration) {
           configuration.setJdbcTypeForNull(JdbcType.NULL);
       }
   }
   */
}

entity:

package com.example.demo.entity;

import com.baomidou.mybatisplus.activerecord.Model;
import com.baomidou.mybatisplus.annotations.TableName;

import java.io.Serializable;

/**
 * Created with LXD
 * author:Luhui
 * Date:2018-06-09
 * Time:13:55
 */
@TableName("user")
public class User extends Model {
    private Integer id;
    private String username;
    private String password;

    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;
    }

    protected Serializable pkVal() {
        return this.id;
    }
}

dao：

package com.example.demo.dao;

import com.baomidou.mybatisplus.mapper.BaseMapper;
import com.example.demo.entity.User;


/**
 * Created with LXD
 * author:Luhui
 * Date:2018-06-09
 * Time:13:56
 */
public interface UserDao extends BaseMapper {

}

service:

package com.example.demo.service;

import com.baomidou.mybatisplus.service.impl.ServiceImpl;
import com.example.demo.dao.UserDao;
import com.example.demo.entity.User;
import org.springframework.stereotype.Service;

/**
 * Created with LXD
 * author:Luhui
 * Date:2018-06-11
 * Time:19:02
 */
@Service
public class UserService extends ServiceImpl {

}

其实mp官方已经提供了非常好的代码生成器，我们的controller,dao,service完全是可以自动生成的。能节省我们写代码的宝贵时间。

application.yml配置:

mybatis-plus:
  # 配置扫描xml
  mapper-locations:
    - classpath:mapper/*.xml
  # 实体扫描，多个package用逗号或者分号分隔
  type-aliases-package: com.example.demo.entity
  global-config:
    # 逻辑删除配置
    logic-delete-value: 0
    logic-not-delete-value: 1
    sql-injector: com.baomidou.mybatisplus.mapper.LogicSqlInjector
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/test
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource

项目结构如下：

最后controller如下:

controller:

package com.example.demo.controller;

import com.example.demo.entity.User;
import com.example.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * Created with LXD
 * author:Luhui
 * Date:2018-06-11
 * Time:17:31
 */
@RestController
public class UserController {
    @Autowired
    private UserService userService;

    @GetMapping("/getall")
    public List getAll(){
        return userService.selectList(null);
    }
}

启动项目，打开浏览器访问：

mp将我们的Mybatis进行了一层很好的封装，它不仅保留了mybatis的所有优点，并且进行了很好的加强！极力推荐大家使用。