Question

我一直在尝试许多不同的github项目示例，并多次阅读bigtable api指南。我不明白为什么它不允许我连续设置多个单元格。在所示的示例中，它们仅具有每行一个值的示例。

我还使用了cbt命令来查看添加的列族是否在表中以及它们是否在表中，但是当我使用count命令时，我看不到任何条目。

我已经在表上使用了mutate_rows命令，并且在行上使用了commit命令，但是都没有添加行。我也意识到行提交命令实际上只是：

table.mutate_rows([row])

所以，我似乎根本无法理解我在做什么错。

import base64
import json
import ast
import datetime

from google.cloud import bigtable
from google.cloud.bigtable import column_family
from google.cloud.bigtable import row_filters


def function(event, context):

    data = base64.b64decode(event['data']).decode('utf-8')
    data = ast.literal_eval(data)

    print(type(data))
    print(data)

    # Create a Cloud Bigtable client.
    client = bigtable.Client(project=project_id, admin=True)

    # Connect to an existing Cloud Bigtable instance.
    instance = client.instance(instance_id)

    print('opening the {} table.'.format(table_id))
    table = instance.table(table_id)

    # [START writing_rows]

    max_versions_rule = column_family.MaxVersionsGCRule(2)
    column_family_id = 'states'.encode('utf-8')
    column_families = {column_family_id: max_versions_rule}
    if not table.exists():
        table.create(column_families=column_families)
    else:
        print("Table {} already exists.".format(table_id))


    row_key = (data['serial_num'] + str(datetime.datetime.utcnow())).encode('utf-8')

    row_obj = table.row(row_key)

    for key, value in data.items():
        row_obj.set_cell(
            column_family_id, 
            str(key).encode('utf-8'), 
            str(value).encode('utf-8'), 
            timestamp=datetime.datetime.utcnow()
        )

    print(row_obj)
    print(str(row_obj))
    print(row_obj.table)
    print(row_obj.row_key)

    row_obj.commit()

    '''
    table.mutate_rows([row_obj])
    '''

    print('Inserted/updated data.')

    # [END writing_rows]

    # [START creating_a_filter]

    # Create a filter to only retrieve the most recent version of the cell
    # for each column across entire row.
    row_filter = row_filters.CellsColumnLimitFilter(1)

    # [END creating_a_filter]

    # [START read_rows]

    row = table.read_row(row_key, row_filter)
    print(row)
    for key, value in data.items():
        cell_values = row.cells[column_family_id][column][0]
        print('{} = {} should be {}'.format(key, cell_values, value))

    # [END read_rows]

Answer 1

这是我最终得到的解决方案

import base64
import json
import ast
import datetime

from google.cloud import bigtable
from google.cloud.bigtable import column_family
from google.cloud.bigtable import row_filters


def hello_pubsub(event, context):

    data = base64.b64decode(event['data']).decode('utf-8')
    data = ast.literal_eval(data)

    print(type(data))
    print(data)

    # Create a Cloud Bigtable client.
    client = bigtable.Client(project=project_id, admin=True)

    # Connect to an existing Cloud Bigtable instance.
    instance = client.instance(instance_id)

    print('opening the {} table.'.format(table_id))
    table = instance.table(table_id)

    # [START writing_rows]

    max_versions_rule = column_family.MaxVersionsGCRule(2)
    column_family_id = 'state'
    column_families = {column_family_id: max_versions_rule}
    if not table.exists():
        table.create(column_families=column_families)
    else:
        print("Table {} already exists.".format(table_id))


    row_key = (data['serial_num'] + " " + str(datetime.datetime.utcnow())).encode('utf-8')

    rows = [] 

    for key, value in data.items():
        row = table.row(row_key)
        row.set_cell(column_family_id, 
            str(key).encode('utf-8'), 
            str(value), 
            timestamp=datetime.datetime.utcnow())
        rows.append(row)


    table.mutate_rows(rows)

    print('Inserted/updated data.')

    # [END writing_rows]

    # [START creating_a_filter]

    # Create a filter to only retrieve the most recent version of the cell
    # for each column across entire row.
    row_filter = row_filters.CellsColumnLimitFilter(1)

    # [END creating_a_filter]

    # [START read_rows]

    partial_rows = table.read_row(row_key, row_filter)
    print(partial_rows.cells)
    for key, value in data.items():
        cell_value = partial_rows.cell_value(column_family_id, str(key).encode('utf-8'))
        print('{} = {} should be {}'.format(key, cell_value, value))

    # [END read_rows]

如何在bigtable的表的一行中添加多个单元格？

1 个答案: