一、加入clickhouse jar包依赖

    <dependency>
        <groupId>ru.yandex.clickhouse</groupId>
        <artifactId>clickhouse-jdbc</artifactId>
        <version>0.1.53</version>
    </dependency>

二、配置Clickhouse数据库连接属性配置文件，clickhouse默认没有密码

spring:
  datasource:
    clickhouse:
      address: jdbc:clickhouse://127.0.0.1:8123
      username: default
      password:
      db: system
      socketTimeout: 600000

三、编写Clickhouse数据库连接操作工具类

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import ru.yandex.clickhouse.ClickHouseConnection;
import ru.yandex.clickhouse.ClickHouseDataSource;
import ru.yandex.clickhouse.settings.ClickHouseProperties;

import java.sql.*;
import java.util.*;

@Slf4j
@Component
public class ClickHouseConfig {
    private static String clickhouseAddress;

    private static String clickhouseUsername;

    private static String clickhousePassword;

    private static String clickhouseDB;

    private static Integer clickhouseSocketTimeout;

    @Value("${spring.datasource.clickhouse.address}")
    public  void setClickhouseAddress(String address) {
        ClickHouseConfig.clickhouseAddress = address;
    }
    @Value("${spring.datasource.clickhouse.username}")
    public  void setClickhouseUsername(String username) {
        ClickHouseConfig.clickhouseUsername = username;
    }
    @Value("${spring.datasource.clickhouse.password}")
    public  void setClickhousePassword(String password) {
        ClickHouseConfig.clickhousePassword = password;
    }
    @Value("${spring.datasource.clickhouse.db}")
    public  void setClickhouseDB(String db) {
        ClickHouseConfig.clickhouseDB = db;
    }
    @Value("${spring.datasource.clickhouse.socketTimeout}")
    public  void setClickhouseSocketTimeout(Integer socketTimeout) {
        ClickHouseConfig.clickhouseSocketTimeout = socketTimeout;
    }

    public static Connection getConn() {

        ClickHouseConnection conn = null;
        ClickHouseProperties properties = new ClickHouseProperties();
        properties.setUser(clickhouseUsername);
        properties.setPassword(clickhousePassword);
        properties.setDatabase(clickhouseDB);
        properties.setSocketTimeout(clickhouseSocketTimeout);
        ClickHouseDataSource clickHouseDataSource = new ClickHouseDataSource(clickhouseAddress,properties);
        try {
            conn = clickHouseDataSource.getConnection();
            return conn;
        } catch (SQLException e) {
            e.printStackTrace();
        }

        return null;
    }

    public static List<Map<String,String>> exeSql(String sql){
        log.info("cliockhouse 执行sql：" + sql);
        Connection connection = getConn();
        try {
            Statement statement = connection.createStatement();
            ResultSet results = statement.executeQuery(sql);
            ResultSetMetaData rsmd = results.getMetaData();
            List<Map<String,String>> list = new ArrayList<>();
            while(results.next()){
                Map<String,String> row = new HashMap<>();
                for(int i = 1;i<=rsmd.getColumnCount();i++){
                    row.put(rsmd.getColumnName(i),results.getString(rsmd.getColumnName(i)));
                }
                list.add(row);
            }

            return list;
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
}

四、是用测试方法执行sql查询数据

 

 

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.List;
import java.util.Map;

@RunWith(SpringRunner.class)
@SpringBootTest
@Slf4j
public class ClickHouseConfigTest {

    @Test
    public void exeSql() {
            log.info("===========测试开始============");
            String sql="select cluster,shard_num from clusters";
            List<Map<String,String>> result= ClickHouseConfig.exeSql(sql);
            log.info("===========查询技术============");
            log.info("clickhouse查询结果为：{}",result);
    }
}

测试成功

 

 

转自：点击领取 https://www.dianjilingqu.com/