行业递归

#上下游递归寻找

import csv
import psycopg2
class IO_rw(object):

    def __init__(self):

        self.conn = psycopg2.connect(database="postgres", user="postgres", password="123456", host="127.0.0.1", port="5432")
        self.cur = self.conn.cursor()
        self.read = []
        self.datadict = {}
    #
    def process_item(self):

        self.cur.execute("select id,name,pid from bjzs_big_data.baoji_industry_level where pid = 0")
        rows = self.cur.fetchall()

        #拿到所有的一级分类
        dict = {}
        for row in rows:
            row = list(row)
            dict[row[0]] = row[1]
        li = list(dict.items())
        return li

    #下游
    def sql_dowm(self,i):

        self.cur.execute("select downid from bjzs_big_data.baoji_industry_chain where upid = {}".format(i))
        rows = self.cur.fetchall()
        downList = []
        for row in rows:
            downList.append(row[0])
        return downList

    #上游
    def sql_up(self,i):
        self.cur.execute("select upid from bjzs_big_data.baoji_industry_chain where downid = {}".format(i))
        rows = self.cur.fetchall()
        downList = []
        for row in rows:
            downList.append(row[0])
        return downList


    def getAllDowm(self, id):
        temp = {}

        #把当前的id放在 全局的read里面。用于纺织重新查找
        self.read.append(id)

        #查找它的下游
        downList =  self.sql_dowm(id)
        #self.getName(downList)

        #查找它的上游
        upList = self.sql_up(id)
        #self.getName(upList)

        temp['up'] = upList
        temp['down'] = downList

        self.datadict[id] = temp

        #判断拿到的 id 是否存在
        for down in downList:
            self.getName(down)
            if down in self.read:
                pass
            else:
                downList = self.getAllDowm(down)

        for up in upList:
            self.getName(up)
            if up in self.read:
                pass
            else:
                downList = self.getAllDowm(up)

    def getName(self,id):
        if id == '':
            return 0
        self.cur.execute("select name from bjzs_big_data.baoji_industry_level where id = {}".format(id))
        rows = self.cur.fetchall()



if __name__ == '__main__':
    r = IO_rw()

    li = r.process_item()

    for i in li:
        r.getAllDowm(i[0])
        print(r.datadict)
        r.datadict = {}
    r.cur.close()
    r.conn.close()