几个HIVE的streaming

      前段时间在做JIS旺铺装修项目的数据开发，整个过程逻辑非常之纠结，有好几处HIVE代码本身无法满足，因此写了四个python的streaming，在此
跟大家分享下，以后有需要用到相似逻辑的同学可以拿去稍微改改直接用。
1）输出某行数据之前所有的数据；
     本实例输入为按照第三个参数分组的数据集，每组中逐条输出所有数据，直到遇到第四个参数为零时则停止输出： import sys
def main():
    flag = ”
    shop_id = ”
    flag_shopid = ”
    for line in sys.stdin:
        line = line.strip(‘\n’)
        if len(line) == 0 : return None
        split_fields = line.split(’01′)
        flag = split_fields[3]
        shop_id = split_fields[2]
        if flag == ’0′ :
            flag_shopid = shop_id
            continue
        elif shop_id == flag_shopid :
            continue
        else : print ’01′.join(split_fields)
if __name__ == ‘__main__’:
    main()
2）数据某行数据之后所有的数据；
   本实例输入为按照第三个参数分组的数据集，每组中判定第四个参数（flag），遇到第一个flag=0，将这组中之后的所有数据输出：
import sys
def main():
    flag = ”
    shop_id = ”
    pre_shopid = ”
    for line in sys.stdin:
        line = line.strip(‘\n’)
        if len(line) == 0 : return None
        split_fields = line.split(’01′)
        flag = split_fields[3]
        shop_id = split_fields[2]
        if flag == ’0′ :
            pre_shopid=split_fields[2]
            print ’01′.join(split_fields)
        elif shop_id==pre_shopid :
            print ’01′.join(split_fields)
        else :
            continue
if __name__ == ‘__main__’:
    main()
3）十进制转成三十六进制（参数为number型）：
def to36hex(number):
    hex = []
    string_list = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z']
    remainder = ”
    finalstr = []
    originnumber = number
    if(number == 0) : finalstr.append(str(number))
    if(number<0) :
        number = -number
    while number>0 :
        remainder = number%36
        number = number/36
        if(remainder<=9) :
            finalstr.append(str(remainder))
        elif(remainder>9 and remainder<36) :
            finalstr.append(string_list[remainder-10])
    if(originnumber>=0) :
        return ”.join(finalstr[::-1])
    else :
        return “-”+”.join(finalstr[::-1])
4）行拼接，列拼接；
   本实例功能为，先将每行最后三个字段以^C为分隔符拼接起来，然后以第三个字段（shopid）为分组，将同一shopid的所有行以^B为分隔符拼接起来输出（程序中还有一些时间戳转换，如果用不到，可适当修改代码）：
import sys
import time
def main():
    final_click = []
    pre_list = []
    cur_list = []
    behaviorsplit = ”
    per_len = 0
    list_len = 0
    is_commit = 0
    for line in sys.stdin:
        line = line.strip(‘\n’)
        if len(line) == 0 : return None   
        split_fields = line.split(’01′)
        cur_list = split_fields[:-3]
        if pre_list == cur_list :
            if split_fields[3] == ” :
                splitfields3 = ‘null’
            else :
                try:
                    splitfields3 = time.strftime(‘%H:%M:%S’, time.localtime(float(split_fields[3])))
                except:
                    pre_list = cur_list
                    continue
            behaviorsplit = splitfields3+’03′+split_fields[4]+’03′+split_fields[5]
            if split_fields[4] == ’0′:
                if is_commit == 1:
                    if final_click!=[]:
                        list_len -= len(final_click.pop())
                else:
                    is_commit = 1
            else :
                is_commit = 0
            per_len = len(behaviorsplit)
            list_len += per_len
            if list_len <= 60000:
                final_click.append(behaviorsplit)
        else :
            if len(pre_list):
                if final_click!=[]:
                    result = final_click[-1].split(’03′)
                    if result[1] == ’0′:
                        final_click.pop()
                    if len(pre_list) and len(final_click) :
                        print ’01′.join(pre_list) + ’01′ + “02″.join(final_click)
            is_commit = 0
            final_click = []
            if split_fields[3] == ” :
                splitfields3 = ‘null’
            else :
                try:
                    splitfields3 = time.strftime(‘%H:%M:%S’, time.localtime(float(split_fields[3])))
                except:
                    pre_list = cur_list
                    continue
            list_len = 0
            if split_fields[4] == ’0′:
                is_commit = 1
                per_len = len(behaviorsplit)
                list_len += per_len
                behaviorsplit = splitfields3+’03′+split_fields[4]+’03′+split_fields[5]
                if list_len <= 60000:
                    final_click.append(behaviorsplit)
        pre_list = cur_list
    if len(pre_list):
        if final_click!=[]:
            result = final_click[-1].split(’03′)
            if result[1] == ’0′:
                final_click.pop()
            if len(pre_list) and len(final_click) :
                print ’01′.join(pre_list) + ’01′ + “02″.join(final_click)
if __name__ == ‘__main__’:
    main() 
  用到的同学有啥问题可以直接骚扰我。