SpringBoot: 通过MyBatis访问ClickHouse-编程知识

一、ClickHouse中建表，添加数据
在这里插入图片描述

二、SpringBoot项目添加mybatis、clickhouse、druid相关依赖

        <dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.2.6</version></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.2</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.30</version></dependency><dependency><groupId>ru.yandex.clickhouse</groupId><artifactId>clickhouse-jdbc</artifactId><version>0.3.2</version></dependency>

三、配置文件进行配置数据源（application.yml)：


spring:jpa:properties:hibernate:dialect: org.hibernate.dialect.MySQL5Dialectdatasource:type: com.alibaba.druid.pool.DruidDataSourceclickhouse:driverClassName: ru.yandex.clickhouse.ClickHouseDriverurl: jdbc:clickhouse://xxx.xxx.xxx.xxx:8123/helloworld #clickhouse地址userName: defaultpassword: defaultinitialSize: 10maxActive: 100minIdle: 10maxWait: 6000validationQuery: SELECT 1
server:port: 9234

四、创建实体类映射数据表：

package cn.edu.tju.domain;public class MyFirstTable {private int price;private String addr;public int getPrice() {return price;}public void setPrice(int price) {this.price = price;}public String getAddr() {return addr;}public void setAddr(String addr) {this.addr = addr;}@Overridepublic String toString() {return "MyFirstTable{" +"price=" + price +", addr='" + addr + '\'' +'}';}
}

五、定义mapper

package cn.edu.tju.mapper;import cn.edu.tju.domain.MyFirstTable;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;@Mapper
public interface MyMapper {@Select("select count(1) from my_first_table")int getCount();@Select("select * from my_first_table where price =#{price}")MyFirstTable getByPrice(int price);}

六、配置SqlSessionFactory

package cn.edu.tju.config;import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;@Component
@ConfigurationProperties(prefix = "spring.datasource.clickhouse")
public class ClickHouseConfig {private String username;private String password;private String driverClassName ;private String url ;private Integer initialSize ;private Integer maxActive ;private Integer minIdle ;private Integer maxWait ;private String validationQuery;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;}public String getDriverClassName() {return driverClassName;}public void setDriverClassName(String driverClassName) {this.driverClassName = driverClassName;}public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}public Integer getInitialSize() {return initialSize;}public void setInitialSize(Integer initialSize) {this.initialSize = initialSize;}public Integer getMaxActive() {return maxActive;}public void setMaxActive(Integer maxActive) {this.maxActive = maxActive;}public Integer getMinIdle() {return minIdle;}public void setMinIdle(Integer minIdle) {this.minIdle = minIdle;}public Integer getMaxWait() {return maxWait;}public void setMaxWait(Integer maxWait) {this.maxWait = maxWait;}public String getValidationQuery() {return validationQuery;}public void setValidationQuery(String validationQuery) {this.validationQuery = validationQuery;}
}

package cn.edu.tju.config;import com.alibaba.druid.pool.DruidDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import javax.sql.DataSource;@Configuration
public class DruidConfig {@Autowiredprivate ClickHouseConfig clickHouseConfig;@Bean(name = "clickHouseDataSource")public DataSource dataSource() throws ClassNotFoundException {Class clazz = Class.forName("com.alibaba.druid.pool.DruidDataSource");DruidDataSource dataSource = (DruidDataSource) DataSourceBuilder.create().driverClassName(clickHouseConfig.getDriverClassName()).type(clazz).url(clickHouseConfig.getUrl()).username(clickHouseConfig.getUsername())//.password(clickHouseConfig.getPassword()).build();dataSource.setMaxWait(clickHouseConfig.getMaxWait());dataSource.setValidationQuery(clickHouseConfig.getValidationQuery());return dataSource;}@Bean("sqlSessionFactory")public SqlSessionFactory clickHouseSqlSessionFactoryBean() throws Exception {SqlSessionFactoryBean factory = new SqlSessionFactoryBean();factory.setDataSource(dataSource());factory.getObject().getConfiguration().setMapUnderscoreToCamelCase(true);return factory.getObject();}
}

七、controller中注入mapper(此处省略了service)

package cn.edu.tju.controller;import cn.edu.tju.domain.MyFirstTable;
import cn.edu.tju.mapper.MyMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;@RestController
public class DemoController {@Autowiredprivate MyMapper myMapper;@RequestMapping("/hello")public String getInfo(){int result = myMapper.getCount();System.out.println(result);return "hello";}@RequestMapping("/hello2")public String getInfo2(){MyFirstTable myFirstTable = myMapper.getByPrice(2015);System.out.println(myFirstTable);return "hello2";}
}