Python教程
【Python】读取Oracle连接表形成CSV文件
本文主要是介绍【Python】读取Oracle连接表形成CSV文件，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！
建表请见：https://www.cnblogs.com/heyang78/p/15855697.html
代码：
#encoding=utf-8
import cx_Oracle
import sys
import datetime
class CsvMaker:
def __init__(self,idx,fromId,toId):
idxStr="{:0>3d}".format(idx)
date=datetime.datetime.today()
dateStr=date.strftime('%Y%m%d_%H%M%S')
self.filename="07_I{0}_F{1}_T{2}_D{3}".format(idxStr,fromId,toId,dateStr)
self.fromId=fromId
self.toId=toId
self.lines=[]
#print(self.filename)
def run(self):
self.fetchDatas()
self.makeFile()
print("文件{0}作成".format(self.filename))
def fetchDatas(self):
conn=cx_Oracle.connect('luna','1234','127.0.0.1:1521/orclhy78')
cursor=conn.cursor();
sql =' select a.name,b.tags from'
sql+=' (select id,name from customer where {0}<id and id<={1}) a'.format(self.fromId,self.toId)
sql+=' inner join'
sql+=' (select cid,listagg(tid,\',\') within group(order by 1) as tags from customer_tag group by cid) b'
sql+=' on a.id=b.cid'
#print(sql)
cursor.execute(sql)
rowset=cursor.fetchall();
for i in range(len(rowset)):
row=rowset[i]
customrName=row[0]
tags=row[1]
line=customrName+","+self.buildLine(tags)
self.lines.append(line)
cursor.close();
conn.close();
def buildLine(self,tags):
list=[]
for i in range(1000):
list.append("0")
arr=tags.split(',')
for i in arr:
idx=int(i)
list[idx-1]="1"
deli=","
return deli.join(list)
def makeFile(self):
deli="\n"
text=deli.join(self.lines)
with open(self.filename,'w') as outfile:
outfile.write(text)
# 下载分段
def downloadSegment(idx,start,end):
#print("idx={0} start={1} end={2}".format(idx,start,end))
m=CsvMaker(idx,start,end)
m.run()
# 分段
def cutSegment(minId,maxId,volumn):
print("minId={0} maxId={1} volumn={2}".format(minId,maxId,volumn))
idx=0
start=minId
end=0
if minId+volumn>maxId:
end=maxId
idx+=1
downloadSegment(idx,start,end)
return
end=start+volumn
while end<maxId:
idx+=1
downloadSegment(idx,start,end)
start=end
end+=volumn
if end>=maxId:
end=maxId
idx+=1
downloadSegment(idx,start,end)
break
#Entrance
minId=int(sys.argv[1])
maxId=int(sys.argv[2])
volumn=10000
if minId<maxId:
cutSegment(minId,maxId,volumn)
else:
print('minId can not be bigger than maxId.')
输出文件片段：
EIXSXEAE,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1 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注：此程序复刻自工作中的程序，原作不易，故留下纪念。
END
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