SpringBoot集成Mybatis-Plus使用

最近web端比较热门的框架就是SpringBoot和Mybatis-Plus，这里简单总结集成用法。

Mybatis-Plus是一个很强大而且方便的ORM框架，而且对SpringBoot也进行了适配，用起来简易，官方网站也有中文文档。

引入Jar

    com.baomidou
    mybatis-plus-boot-starter
    3.0.2

Mybatis-Plus对SpringBoot进行了适配，所以可如此引入。下面的Jar可用于SpringMVC或者单独使用

    com.baomidou
    mybatis-plus
    3.0.2

全局配置

spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&useSSL=true
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

mybatis-plus.type-aliases-package=com.plf.springbootmybatisplus.entity
#AUTO 数据库自增ID;ID_WORKER 全局唯一ID，内容为空自动填充（默认配置）；
#INPUT 用户输入ID;UUID 全局唯一ID，内容为空自动填充
mybatis-plus.global-config.db-config.id-type=AUTO 
mybatis-plus.global-config.db-config.table-underline=true

实体类

import java.util.Date;

import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;

@TableName
public class Log {
	@TableId
	private Integer id;
	
	@TableField
	private String content;
	
	@TableField
	private Date createtime;

	public Integer getId() {
		return id;
	}

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

	public String getContent() {
		return content;
	}

	public void setContent(String content) {
		this.content = content;
	}

	public Date getCreatetime() {
		return createtime;
	}

	public void setCreatetime(Date createtime) {
		this.createtime = createtime;
	}
}

Mybatis-Plus配置类

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;

@Configuration
@MapperScan("com.plf.springbootmybatisplus.mapper*")
public class MybatisPlusConfig {
   @Bean
   public PaginationInterceptor paginationInterceptor() {
      return new PaginationInterceptor();
   }
}

Mapper类

import org.springframework.stereotype.Repository;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.plf.springbootmybatisplus.entity.Log;

@Repository
public interface LogMapper extends BaseMapper{

}

上述接口继承BaseMapper,即可使用通用方法

接口方法

import com.baomidou.mybatisplus.extension.service.IService;
import com.plf.springbootmybatisplus.entity.Log;

public interface LogService extends IService{
	
	public void insertLog(Log log);
}

接口实现类

@Service
public class LogServiceImpl extends ServiceImpl,Log> 
		implements LogService {

	@Override
	public void insertLog(Log log) {
		baseMapper.insert(log);
	}

}

控制器类

import java.util.Date;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.plf.springbootmybatisplus.entity.Log;
import com.plf.springbootmybatisplus.service.impl.LogServiceImpl;

@RestController
@RequestMapping("/log")
public class LogController {

	@Autowired
	private LogServiceImpl logServiceImpl; 
	
	//日志插入
	@RequestMapping("/add")
	public String addLog(Log log){
		log.setCreatetime(new Date());
		logServiceImpl.insertLog(log);
		return "success";
	} 
}

调用接口

http://localhost:8080/log/add?content=test

逻辑删除

配置逻辑值

# 已删除表示1
mybatis-plus.global-config.db-config.logic-delete-value=1
# 未删除表示0
mybatis-plus.global-config.db-config.logic-not-delete-value=0

注入LogicSqlInjector

@Bean
public ISqlInjector sqlInjector(){
    return new LogicSqlInjector();
}

实体类标注逻辑删除字段

@TableField
@TableLogic
private Integer delstatus;

测试

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class LogServiceTest {

	@Autowired
	private LogService logService;
	
	@Test
	public void delLog(){
		logService.deleteLog(5);
	}
	
}

结果

后台执行如下语句
UPDATE log SET delstatus=1 WHERE id=? AND delstatus=0 

分页查询

注入分页插件

@Bean
public PaginationInterceptor paginationInterceptor() {
  return new PaginationInterceptor();
}

编写接口方法

public Page getPageLog(Page page, String strattime);

实现接口方法

@Override
public Page getPageLog(Page page, String starttime) {
	return (Page) baseMapper.selectPage(page,
	 new QueryWrapper().select("content,createtime,user_id").gt("createtime",starttime));
}

测试

@Test
public void ListPage(){
	Page page=logService.getPageLog(new Page(1,2), "2018-10-09");
	System.out.println("total:"+page.getTotal());
	List list = page.getRecords();
	for (Log log : list) {
		System.out.println(log);
	}
}

结果

后台SQL语句

Preparing: SELECT COUNT(1) FROM log WHERE delstatus = 0 AND createtime > ? 
Parameters: 2018-10-09(String)
Preparing: SELECT content,createtime,user_id FROM log WHERE delstatus=0 AND createtime > ? LIMIT 0,2 
Parameters: 2018-10-09(String)
Total: 2

结果

total:3
Log [id=null, userId=1, content=test, 
	createtime=Wed Oct 10 21:03:17 CST 2018, delstatus=null]
Log [id=null, userId=1, content=test2, 
	createtime=Thu Oct 11 20:51:47 CST 2018, delstatus=null]

自定义联表分页查询

新建DTO类用于接受联表字段

import java.util.Date;

public class LogDto{
	private String content;
	
	private Date createtime;
	
	private String username;

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getContent() {
		return content;
	}

	public void setContent(String content) {
		this.content = content;
	}

	public Date getCreatetime() {
		return createtime;
	}

	public void setCreatetime(Date createtime) {
		this.createtime = createtime;
	}

	@Override
	public String toString() {
		return "LogDto [content=" + content + ", createtime=" + createtime + ", username=" + username + "]";
	}
}

在LogMapper中编写SQL语句

@Select("select l.content,u.username,l.createtime from log l"
		+ " left join user u on l.user_id=u.id"
		+ " where u.username=#{username}")
public List getLogAndName(Page page,@Param("username")String username);

编写接口方法

public Page getLogAndName(Page page, String username);

实现接口方法

@Override
public Page getLogAndName(Page page, String username) {
	List records = baseMapper.getLogAndName(page,username);
	page.setRecords(records);
	return page;
}

测试

@Test
public void ListPageAndName(){
	Page page=logService.getLogAndName(new Page(1,2), "小白");
	List list = page.getRecords();
	for (LogDto logDto : list) {
		System.out.println(logDto);
	}
}

结果

后台SQL语句

Preparing: SELECT COUNT(1) FROM log l LEFT JOIN user u ON l.user_id = u.id WHERE u.username = ? 
Parameters: 小白(String)
Preparing: select l.content,u.username,l.createtime from log l left join user u on l.user_id=u.id where u.username=? LIMIT 0,2 
小白(String)
Total: 2


结果

LogDto [content=测试1, createtime=Sun Oct 07 21:01:37 CST 2018, username=小红]
LogDto [content=test, createtime=Wed Oct 10 21:03:17 CST 2018, username=小红]

条件构造器

从官网搬运过来的，方便自己查看。

查询方式	说明
setSqlSelect	设置 SELECT 查询字段
where	WHERE 语句，拼接 + WHERE 条件
and	AND 语句，拼接 + AND 字段=值
andNew	AND 语句，拼接 + AND (字段=值)
or	OR 语句，拼接 + OR 字段=值
orNew	OR 语句，拼接 + OR (字段=值)
eq	等于=
allEq	基于 map 内容等于=
ne	不等于<>
gt	大于>
ge	大于等于>=
lt	小于<
le	小于等于<=
like	模糊查询 LIKE
notLike	模糊查询 NOT LIKE
in	IN 查询
notIn	NOT IN 查询
isNull	NULL 值查询
isNotNull	IS NOT NULL
groupBy	分组 GROUP BY
having	HAVING 关键词
orderBy	排序 ORDER BY
orderAsc	ASC 排序 ORDER BY
orderDesc	DESC 排序 ORDER BY
exists	EXISTS 条件语句
notExists	NOT EXISTS 条件语句
between	BETWEEN 条件语句
notBetween	NOT BETWEEN 条件语句
addFilter	自由拼接 SQL
last	拼接在最后，例如：last(“LIMIT 1”)