【Python】读取Oracle连接表形成CSV文件一
在年前一周,我接受了一项需求:目标Postgre系统有三张表,用户表Customer,最大有两百万数据;标记表tag,一开始定为10000个,后来改为1600个;两者的连接表Customer_Tag,这个多,最多时为2,000,000*1600=32,0000,0000条。现在需要将每个用户拥有的tag以csv的形式输出出来,tag存在标1,Tag不存在标0,中间以逗号分隔。我在本机Oracle上创建了模拟环境,建表请见:https://www.cnblogs.com/heyang78/p/15855697.html
这个任务其实简单,提速的核心在取数据的SQL和给Customer_Tag加索引上,但这是后话。做的过程中被环境和人的因素影响太大,等环境就绪和需求明确后,任务就简单了。
花了一番心血写就的程序当然不能随便忘记,于是留份记录在此。
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:
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