【Python】读取Oracle连接表形成CSV文件

建表请见:https://www.cnblogs.com/heyang78/p/15855697.html

 

代码:

【Python】读取Oracle连接表形成CSV文件
#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.')
【Python】读取Oracle连接表形成CSV文件

输出文件片段:

【Python】读取Oracle连接表形成CSV文件
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【Python】读取Oracle连接表形成CSV文件

 

注:此程序复刻自工作中的程序,原作不易,故留下纪念。

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