我有一个名为' testfolder'的文件夹。其中包括两个文件 - ' Sigurdlogfile'和' 2004ADlogfile'。每个文件都有一个名为entries
的字符串列表。我需要在它们上面运行我的代码并使用glob
来执行此操作。我的代码为每个文件创建一个字典,并存储使用正则表达式提取的数据,其中字典键存储在下面的commonterms
中。然后它将每个字典插入到mysql表中。它成功地完成了所有这些,但我的第二个sql语句没有插入它应该如何(每个文件)。
import glob
import re
files = glob.glob('/home/user/testfolder/*logfile*')
commonterms = (["freq", "\s?(\d+e?\d*)\s?"],
["tx", "#txpattern"],
["rx", "#rxpattern"], ...)
terms = [commonterms[i][0] for i in range(len(commonterms))]
patterns = [commonterms[i][1] for i in range(len(commonterms))]
def getTerms(entry):
for i in range(len(terms)):
term = re.search(patterns[i], entry)
if term:
term = term.groups()[0] if term.groups()[0] is not None else term.groups()[1]
else:
term = 'NULL'
d[terms[i]] += [term]
return d
for filename in files:
#code to create 'entries'
objkey = re.match(r'/home/user/testfolder/(.+?)logfile', filename).group(1)
d = {t: [] for t in terms}
for entry in entries:
d = getTerms(entry)
import MySQLdb
db = MySQLdb.connect(host='', user='', passwd='', db='')
cursor = db.cursor()
cols = d.keys()
vals = d.values()
for i in range(len(entries)):
lst = [item[i] for item in vals]
csv = "'{}'".format("','".join(lst))
sql1 = "INSERT INTO table (%s) VALUES (%s);" % (','.join(cols), csv.replace("'NULL'", "NULL"))
cursor.execute(sql1)
#now in my 2nd sql statement I need to update the table with data from an old table, which is where I have the problem...
sql2 = "UPDATE table, oldtable SET table.key1 = oldtable.key1,
table.key2 = oldtable.key2 WHERE oldtable.obj = %s;" % repr(objkey)
cursor.execute(sql2)
db.commit()
db.close()
问题是在第二个sql语句中,它最终只从objkey
中的一个将数据插入到表的所有列中,但我需要它根据哪个文件插入不同的数据代码当前正在运行。我无法弄清楚为什么会这样,因为我在objkey
循环中定义了for filename in files
。我该如何解决这个问题?
答案 0 :(得分:1)
不要单独执行INSERT
和UPDATE
,而是将它们组合在一起以合并旧表中的字段。
for i in range(len(entries)):
lst = [item[i] for item in vals]
csv = "'{}'".format("','".join(lst))
sql1 = """INSERT INTO table (key1, key2, %s)
SELECT o.key1, o.key2, a.*
FROM (SELECT %s) AS a
LEFT JOIN oldtable AS o ON o.obj = %s""" % (','.join(cols), csv.replace("'NULL'", "NULL"), repr(objkey))
cursor.execute(sql1)