Question

我有一种情况，我需要在远程服务器上读取TEXT文件并将读取的数据写入另一台服务器。

我正在使用以下代码，但不知道访问和读取远程文件并将其写入目标服务器需要进行哪些修改。在我的本地环境中，查询工作正常。

我的源服务器是MySQL，目标服务器是PostgreSQL。

任何线索都会有很大帮助。

import psycopg2
import time
import os
import MySQLdb
from utils.config import Configuration as Config
from utils.postgres_helper import get_connection
from utils.utils import get_global_config

start_time = time.perf_counter()

#Magento connection 
try:
    source_host = 'mag'
    conf = get_global_config()
    cnx_msql = MySQLdb.connect(host=conf.get(source_host, 'host'),
                               user=conf.get(source_host, 'user'),
                               passwd=conf.get(source_host, 'password'),
                               port=int(conf.get(source_host, 'port')),
                               db=conf.get(source_host, 'db'))
    print ("Source Connected")
except mysql.connector.Error as e:
   print ("MYSQL: Unable to connect!", e.msg)
   sys.exit(1)

# Postgresql connection
 try:
   cnx_psql = get_connection(get_global_config(), 'pg_dwh')
   print ("DWH Connected")
 except psycopg2.Error as e:
   print('PSQL: Unable to connect!\n{0}').format(e)
   sys.exit(1)


# Cursors initializations
 cur_msql = cnx_msql.cursor()
 cur_psql = cnx_psql.cursor()

except (Exception, psycopg2.Error) as error:
        # Confirm unsuccessful connection and stop program execution.
        print ("Error while fetching data from PostgreSQL", error)
        print("Database connection unsuccessful.")
        quit()        
try:

    #filePath='''/Users/linu/Downloads/log''' 
    filePath='''/deft/log/final/log.txt''' 
    table='staging.stock_dump'

    SQL="""DROP TABLE IF EXISTS """+  table + """;CREATE TABLE IF NOT EXISTS """+ table + """
      (created_date TEXT, product_sku TEXT, previous_stock TEXT, current_stock TEXT );"""

    cur_psql.execute(SQL)
    cnx_psql.commit()

    with open(filePath, 'r') as file:
         for line in file:
           if 'Stock:' in line:
            fields=line.split(" ")
            date_part1=fields[0]
            date_part2=fields[1][:-1]
            sku=fields[3]
            prev_stock=fields[5]
            current_stock=fields[7]
            if prev_stock.strip()==current_stock.strip():
                continue
            else:
               cur_psql.execute("insert into " + table+"(created_date, product_sku, previous_stock , current_stock)" + " select CAST('" + date_part1+ " "+ date_part2 + "' AS TEXT)" +", CAST('"+sku+"' AS TEXT),CAST('" + prev_stock +"' AS TEXT),CAST('" +current_stock  + "' AS TEXT);")

    cnx_psql.commit()       
    cur_psql.close()
    cnx_psql.close()
    print("Data loaded to DWH from text file")
    print("Data porting took %s seconds to finish---" % (time.perf_counter() - start_time))

except (Exception, psycopg2.Error) as error:
        print ("Error while fetching data from PostgreSQL", error)
        print("Error adding  information.")
        quit()

Answer 1

因此，您正在尝试从Mysql（Magento）服务器读取数据并将其写入Postgresql服务器，是吗？而不是读取文本文件，您需要对Mysql服务器运行SQL查询，对返回的数据的模式和类型进行所需的任何转换，然后将每个记录插入到Postgresql中。如果您要处理大量数据，则有大量加载选项可供探索。

使用python读取远程文本文件

1 个答案: