Python如何连接clickhouse，有哪些方式-群英

上一篇：Python多cpu并行编程是怎样，要点有什么下一篇：Matplotlib进行散点图绘制的方法及代码是什么

在实际应用中，我们有时候会遇到“Python如何连接clickhouse，有哪些方式”这样的问题，我们该怎样来处理呢？下文给大家介绍了解决方法，希望这篇“Python如何连接clickhouse，有哪些方式”文章能帮助大家解决问题。

python连接clickhouse数据库

在Python中获取系统信息的一个好办法是使用psutil这个第三方模块。

顾名思义，psutil = process and system utilities，它不仅可以通过一两行代码实现系统监控，还可以跨平台使用。

主要针对clickhouse_driver的使用进行简要介绍

第一步：

通过pip install clickhouse_driver 安装 clickhouse_driver

第二步：

方法一：使用clickhouse_driver 包中的Client类,通过实例化一个客户端进行对数据库的增删改查操作

from clickhouse_driver import Client
from datetime import datetime
import psutil
host_name = '192.168.50.94'
client = Client(host=host_name,database='default',user='default',password='自己设的密码',send_receive_timeout=20,port=55666)
now = datetime.now()
time_stamp = now.strftime('%a %b %d %H:%M:%S CST %Y')# Tue Apr 06 15:32:55 CST 2021  <class 'str'>
create_at = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
disk_io = psutil.disk_io_counters()
net_io = psutil.net_io_counters()
chart_name = ["磁盘IO","网络IO"]
metric_name1 = ["读(数量)","写(数量)", "读(字节)", "写(字节)", "读(时间)", "写(时间)"]
metric_name2 = ["发送字节数","接收字节数","发送包数","接收包"]
metric_value1 = [disk_io.read_count,disk_io.write_count,disk_io.read_bytes,disk_io.write_bytes,disk_io.read_time,disk_io.write_time]
metric_value2 = [net_io.bytes_sent,net_io.bytes_recv,net_io.packets_sent,net_io.packets_recv]
try:
    for i in chart_name:
        if i is "磁盘IO":
            for j in metric_name1:
                sql = "insert into clickhouse_host_metrics777(time_stamp,host_name, chart_name, metric_name,metric_value,create_at) " \
                      "values('%s','%s','%s','%s','%s','%s')" % \
                         (time_stamp, host_name, i, j, metric_value1[metric_name1.index(j)], create_at)
                res = client.execute(sql)
        elif i is "网络IO":
            for j in metric_name2:
                sql = "insert into clickhouse_host_metrics777(time_stamp,host_name, chart_name, metric_name,metric_value,create_at) " \
                      "values('%s','%s','%s','%s','%s','%s')" % \
                      (time_stamp, host_name, i, j, metric_value2[metric_name2.index(j)], create_at)
                res = client.execute(sql)
    print("成功写入数据")
except Exception as e:
    print(str(e))

方法二：使用clickhouse_driver 包中的connect函数,通过实例化一个客户端进行对数据库的增删改查操作

from datetime import datetime
import psutil
from clickhouse_driver import connect
host_name = '192.168.50.94'
#账号:密码@主机名:端口号/数据库
conn = connect('clickhouse://default:自己设的密码@'+host_name+':55666/default')
cursor = conn.cursor()
now = datetime.now()
time_stamp = now.strftime('%a %b %d %H:%M:%S CST %Y')# Tue Apr 06 15:32:55 CST 2021  <class 'str'>
create_at = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
disk_io = psutil.disk_io_counters()
net_io = psutil.net_io_counters()
chart_name = ["磁盘IO","网络IO"]
metric_name1 = ["读(数量)","写(数量)", "读(字节)", "写(字节)", "读(时间)", "写(时间)"]
metric_name2 = ["发送字节数","接收字节数","发送包数","接收包"]
metric_value1 = [disk_io.read_count,disk_io.write_count,disk_io.read_bytes,disk_io.write_bytes,disk_io.read_time,disk_io.write_time]
metric_value2 = [net_io.bytes_sent,net_io.bytes_recv,net_io.packets_sent,net_io.packets_recv]
try:
    for i in chart_name:
        if i is "磁盘IO":
            for j in metric_name1:
                sql = "insert into clickhouse_host_metrics777(time_stamp,host_name, chart_name, metric_name,metric_value,create_at) values('%s','%s','%s','%s','%s','%s')" % \
                         (time_stamp, host_name, i, j, metric_value1[metric_name1.index(j)], create_at)
                # res = client.execute(sql)
                res = cursor.execute(sql)
        elif i is "网络IO":
            for j in metric_name2:
                sql = "insert into clickhouse_host_metrics777(time_stamp,host_name, chart_name, metric_name,metric_value,create_at) values('%s','%s','%s','%s','%s','%s')" % \
                      (time_stamp, host_name, i, j, metric_value2[metric_name2.index(j)], create_at)
                res = cursor.execute(sql)
    cursor.close()
    print("成功写入数据")
except Exception as e:
    print(str(e))

python将数据写入clickhouse

from clickhouse_driver import Client 
 
# connect ClickHouse
client = Client(host= ,port= ,user= ,database= , password=)
 
 
# 得到table1中查询的数据导入table2中（database2中应该事先建立对应的table2表）
query_ck_sql = """ SELECT *
    FROM database1.table1
    WHERE date = today() """
# 导入数据到临时表
try:
    # 导入数据
    client.execute("insert into {official_table_db}.{official_all_table_name}  \
        {query_ck_sql}".format(
            official_table_db = database2, 
            official_table_name = table2, 
            query_ck_sql = query_ck_sql) 
        ,types_check = True)
except Exception as e:
    print str(e)

上述内容具有一定的借鉴价值，感兴趣的朋友可以参考，希望能对大家有帮助，想要了解更多"Python如何连接clickhouse，有哪些方式"的内容，大家可以关注群英网络的其它相关文章。