Springboot集成ClickHouse及应用场景分析

ClickHouse应用场景：

1.绝大多数请求都是用于读访问的
2.数据需要以大批次（大于1000行）进行更新，而不是单行更新；或者根本没有更新操作
3.数据只是添加到数据库，没有必要修改
4.读取数据时，会从数据库中提取出大量的行，但只用到一小部分列
5.表很“宽”，即表中包含大量的列
6.查询频率相对较低（通常每台服务器每秒查询数百次或更少）
7.对于简单查询，允许大约50毫秒的延迟
8.列的值是比较小的数值和短字符串（例如，每个URL只有60个字节）
9.在处理单个查询时需要高吞吐量（每台服务器每秒高达数十亿行）
10.不需要事务
11.数据一致性要求较低
12.每次查询中只会查询一个大表。除了一个大表，其余都是小表
13.查询结果显著小于数据源。即数据有过滤或聚合。返回结果不超过单个服务器内存大小

行式存储对比列式存储：

(1)、行式数据

(2)、列式数据

(3)、对比分析

分析类查询，通常只需要读取表的一小部分列。在列式数据库中可以只读取需要的数据。数据总是打包成批量读取的，所以压缩是非常容易的。同时数据按列分别存储这也更容易压缩。这进一步降低了I/O的体积。由于I/O的降低，这将帮助更多的数据被系统缓存。

整合Springboot：

核心依赖（mybatis plus做持久层，druid做数据源）：

<dependencies>
   <!--clickhouse-->
   <dependency>
       <groupId>ru.yandex.clickhouse</groupId>
       <artifactId>clickhouse-jdbc</artifactId>
       <version>0.3.1-patch</version>
   </dependency>
   <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
   <dependency>
       <groupId>com.alibaba</groupId>
       <artifactId>druid</artifactId>
       <version>1.2.6</version>
   </dependency>
   <!-- https://mvnrepository.com/artifact/com.baomidou/mybatis-plus-boot-starter -->
   <dependency>
       <groupId>com.baomidou</groupId>
       <artifactId>mybatis-plus-boot-starter</artifactId>
       <version>3.4.3.1</version>
   </dependency>
</dependencies>

配置yml文件：

spring:
 datasource:
   type: com.alibaba.druid.pool.DruidDataSource
   click:
     driverClassName: ru.yandex.clickhouse.ClickHouseDriver
     url: jdbc:clickhouse://127.0.0.1:8123/dbname
     username: username
     password: 123456
     initialSize: 10
     maxActive: 100
     minIdle: 10
     maxWait: 6000

mybatis-plus:
 mapper-locations: classpath*:mapper/*.xml
 configuration:
   log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
   map-underscore-to-camel-case: true
   cache-enabled: true
   lazy-loading-enabled: true
   multiple-result-sets-enabled: true
   use-generated-keys: true
   default-statement-timeout: 60
   default-fetch-size: 100
 type-aliases-package: com.example.tonghp.entity

ClickHouse与Druid连接池配置类：

参数配置：

package com.example.tonghp.config;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
/**
* @author: tonghp
* @create: 2021/07/26 16:23
*/
@Data
@Component
@ConfigurationProperties(prefix = "spring.datasource.click")
public class JdbcParamConfig {
   private String driverClassName ;
   private String url ;
   private Integer initialSize ;
   private Integer maxActive ;
   private Integer minIdle ;
   private Integer maxWait ;
   private String username;
   private String password;
   // 省略 GET 和 SET
}

Druid连接池配置

package com.example.tonghp.config;
import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.annotation.Resource;
import javax.sql.DataSource;
import javax.swing.*;
/**
* @author: tonghp
* @create: 2021/07/26 16:22
*/
@Configuration
public class DruidConfig {
   @Resource
   private JdbcParamConfig jdbcParamConfig ;
   @Bean
   public DataSource dataSource() {
       DruidDataSource datasource = new DruidDataSource();
       datasource.setUrl(jdbcParamConfig.getUrl());
       datasource.setDriverClassName(jdbcParamConfig.getDriverClassName());
       datasource.setInitialSize(jdbcParamConfig.getInitialSize());
       datasource.setMinIdle(jdbcParamConfig.getMinIdle());
       datasource.setMaxActive(jdbcParamConfig.getMaxActive());
       datasource.setMaxWait(jdbcParamConfig.getMaxWait());
       datasource.setUsername(jdbcParamConfig.getUsername());
       datasource.setPassword(jdbcParamConfig.getPassword());
       return datasource;
   }
}

接下来配置实体类，mapper，service，controlle以及mapper.xml。与mybatisplus操作mysql一样的思路。

package com.example.tonghp.entity;

import lombok.Data;
import java.io.Serializable;
/**
* @author: tonghp
* @create: 2021/07/26 16:31
*/
@Data
public class UserInfo implements Serializable {
   private static final long serialVersionUID = 1L;
   private int id;
   private String userName;
   private String passWord;
   private String phone;
   private String email;
   private String createDay;
}

package com.example.tonghp.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.tonghp.entity.UserInfo;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;
import java.util.List;
/**
* @author: tonghp
* @create: 2021/07/26 16:32
*/
@Repository
public interface UserInfoMapper extends BaseMapper<UserInfo> {
   // 写入数据
   void saveData (UserInfo userInfo) ;
   // ID 查询
   UserInfo selectById (@Param("id") Integer id) ;
   // 查询全部
   List<UserInfo> selectList () ;
}

UserInfoMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.tonghp.mapper.UserInfoMapper">
   <resultMap id="BaseResultMap" type="com.example.tonghp.entity.UserInfo">
       <id column="id" jdbcType="INTEGER" property="id" />
       <result column="user_name" jdbcType="VARCHAR" property="userName" />
       <result column="pass_word" jdbcType="VARCHAR" property="passWord" />
       <result column="phone" jdbcType="VARCHAR" property="phone" />
       <result column="email" jdbcType="VARCHAR" property="email" />
       <result column="create_day" jdbcType="VARCHAR" property="createDay" />
   </resultMap>
   <sql id="Base_Column_List">
       id,user_name,pass_word,phone,email,create_day
   </sql>
   <insert id="saveData" parameterType="com.example.tonghp.entity.UserInfo" >
       INSERT INTO cs_user_info
       (id,user_name,pass_word,phone,email,create_day)
       VALUES
       (#{id,jdbcType=INTEGER},#{userName,jdbcType=VARCHAR},#{passWord,jdbcType=VARCHAR},
       #{phone,jdbcType=VARCHAR},#{email,jdbcType=VARCHAR},#{createDay,jdbcType=VARCHAR})
   </insert>
   <select id="selectById" parameterType="java.lang.Integer" resultMap="BaseResultMap">
       select
       <include refid="Base_Column_List" />
       from cs_user_info
       where id = #{id,jdbcType=INTEGER}
   </select>
   <select id="selectList" resultMap="BaseResultMap" >
       select
       <include refid="Base_Column_List" />
       from cs_user_info
   </select>
</mapper>

Service

package com.example.tonghp.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.example.tonghp.entity.UserInfo;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* @author: tonghp
* @create: 2021/07/26 16:46
*/
public interface UserInfoService extends IService<UserInfo> {
   // 写入数据
   void saveData (UserInfo userInfo) ;
   // ID 查询
   UserInfo selectById (@Param("id") Integer id) ;
   // 查询全部
   List<UserInfo> selectList () ;
}

ServiceImpl

package com.example.tonghp.service.impl;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.tonghp.entity.UserInfo;
import com.example.tonghp.mapper.UserInfoMapper;
import com.example.tonghp.service.UserInfoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* @author: tonghp
* @create: 2021/07/26 16:48
*/
@Service
public class UserInfoServiceImpl extends ServiceImpl<UserInfoMapper, UserInfo> implements UserInfoService {
   @Autowired
   UserInfoMapper userInfoMapper;
   @Override
   public void saveData(UserInfo userInfo) {
       userInfoMapper.saveData(userInfo);
   }
   @Override
   public UserInfo selectById(Integer id) {
       return userInfoMapper.selectById(id);
   }
   @Override
   public List<UserInfo> selectList() {
       return userInfoMapper.selectList();
   }
}

Controller

package com.example.tonghp.controller;
import com.example.tonghp.entity.UserInfo;
import com.example.tonghp.service.UserInfoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
import java.util.List;
/**
* @author: tonghp
* @create: 2021/07/26 16:45
*/
@RestController
@RequestMapping("user")
public class UserInfoController {
   @Autowired
   private UserInfoService userInfoService ;
   @RequestMapping("saveData")
   public String saveData (){
       UserInfo userInfo = new UserInfo () ;
       userInfo.setId(4);
       userInfo.setUserName("winter");
       userInfo.setPassWord("567");
       userInfo.setPhone("13977776789");
       userInfo.setEmail("winter");
       userInfo.setCreateDay("2020-02-20");
       userInfoService.saveData(userInfo);
       return "sus";
   }
   @RequestMapping("selectById")
   public UserInfo selectById () {
       return userInfoService.selectById(1) ;
   }
   @RequestMapping("selectList")
   public List<UserInfo> selectList () {
       return userInfoService.selectList() ;
   }
}

main()

package com.example.tonghp;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.example.tonghp.mapper")
public class TonghpApplication {
   public static void main(String[] args) {
       SpringApplication.run(TonghpApplication.class, args);
   }
}

参考链接：

https://blog.csdn.net/weixin_46792649/article/details/115306384

https://www.cnblogs.com/ywjfx/p/14333974.html

https://www.cnblogs.com/cicada-smile/p/11632251.html

https://github.com/cicadasmile/middle-ware-parent

另外还有一种直接操作JDBC的：

https://blog.csdn.net/Alice_qixin/article/details/84957380

来源：https://www.cnblogs.com/fightingtong/p/15064407.html