protobuf python api

摘要：

python中一切都可以看作类。那么如何查看每个类的API。使用ipython

python  protobuf 的函数在message中定义

此处所有的api说明：https://developers.google.com/protocol-buffers/docs/reference/python/google.protobuf.message.Message-class

编译

protoc -I=./ --python_out=./ people.proto

1  GidChannelInfo.proto

package bfd.gidchannelinfo;
//定义 gid的来源，是dsp还是电商或者媒体等
message Channel
{
required string name = 1; //来源，例如dsp_Cbehe
required int64 timestamp = 2; //时间戳
}


//key为 G:Channel:gid
message GidChannelInfo
{
required Channel init_channel = 1; //gid初次产生的channel来源
repeated Channel channel = 2; //包含的所有channel渠道
}

2  例子

gidchannelinfo_tmp = GidChannelInfo_pb2.GidChannelInfo()
channel_tmp = GidChannelInfo_pb2.Channel()


DB_SERVER = 'app-2'
db = "DMP_GDMP_Cbehe"
conn = mdb.Connect(DB_SERVER,'bfdroot','qianfendian',db)
cur = conn.cursor()
#cur.execute("select gid,update_time from Mapping_gid where id >0 and id<20000000")
cur.execute("select gid,update_time from Mapping_gid limit 1")
results = cur.fetchall()
for result in results:
    print "result :",str(result)
    gid = result[0]

date_tmp = result[1]
    key = "G:GidChannelInfo:"+gid
    #d = datetime.datetime.strptime(date_tmp,"%Y-%m-%d %H:%M:%S")
    timestamp_tmp = int(time.mktime(date_tmp.timetuple()))
    channel_tmp.name = "dsp_baifendian"
    channel_tmp.timestamp = timestamp_tmp
    print "timestamp_tmp :",timestamp_tmp
    gidchannelinfo_tmp.init_channel.CopyFrom(channel_tmp)
    channel_tmp = gidchannelinfo_tmp.channel.add()
    channel_tmp.name = "dsp_baifendian"
    channel_tmp.timestamp = timestamp_tmp
    channel_tmp = gidchannelinfo_tmp.channel.add()
    channel_tmp.name = "dsp_behe"
    channel_tmp.timestamp = timestamp_tmp
    print "gidchannelinfo_tmp: ",gidchannelinfo_tmp
    mystr = gidchannelinfo_tmp.SerializeToString()

3 注意 ：

对于 Singular fields  可以使用 gci.init_channel.MergeFrom赋值

或者对于每个属性赋值。gci.init_channel.name=name

对于repeated fileds可以使用

CopyFrom    MergeFrom

4 api 说明

MergeFrom(self, other_msg)

source code 

Merges the contents of the specified message into current message.This method merges the contents of the specified message into the currentmessage. Singular fields that are set in the specified message overwritethe corresponding fields in the current message. Repeated fields areappended. Singular sub-messages and groups are recursively merged.Args:  other_msg: Message to merge into the current message.

CopyFrom(self, other_msg)

source code 

Copies the content of the specified message into the current message.The method clears the current message and then merges the specifiedmessage using MergeFrom.Args:  other_msg: Message to copy into the current one.

此处所有的api说明：https://developers.google.com/protocol-buffers/docs/reference/python/google.protobuf.message.Message-class