Question

我设置了Apache Phoenix数据库，我正在尝试使用Python和PhoenixDb插件进行查询。

我有一个包含以下行的表：

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| PK | did | sensorid | sensor_timestamp | EXTRA_LEVEL | EXTRA_SCALE | EXTRA_HEALTH | EXTRA_STATUS | EXTRA_PLUGGED | EXTRA_PRESENT | EXTRA_VOLTAGE | level_percent | temperature_C | EXTRA_TECHNOLOGY | EXTRA_TEMPERATURE |
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

当我尝试使用phoenixdb查询它时，它会遗漏1行，但我没有收到任何错误。

我的查询代码是：

import phoenixdb

connection = phoenixdb.connect(<url>)
cursor = connection.cursor()

query = """select PK,"did", "sensorid", "sensor_timestamp", {3}
           from "sensor_data"
           where "did"='{0}'
           and "sensorid" = '{1}'
           and "sensor_timestamp" > '{2}'
           order by "sensor_timestamp"
           limit 10""".format(357139052213522, 902, 1463163952256, '"EXTRA_LEVEL", "EXTRA_SCALE", "EXTRA_HEALTH", ' \
             '"EXTRA_STATUS" "EXTRA_PLUGGED", "EXTRA_PRESENT", ' \
             '"EXTRA_VOLTAGE", "level_percent", "temperature_C", ' \
             '"EXTRA_TECHNOLOGY","EXTRA_TEMPERATURE"')

cursor.execute(query)

rows = cursor.fetchall()
for row in rows:
    print(row)

我的输出是：

['357139052213522_1486731821342_902', '357139052213522', '902', '1486731821342', '64', '100', '2', '2', 'true', '3990', '64.0', '25.0', 'Li-ion', '257']

通过计算，我发现有一个项目丢失了。有没有人知道这可能是什么原因？

Answer 1

好。这是一个非常愚蠢的错误。我发现我在查询中遗漏了一个逗号。修复解决了这一切：

query = """select PK,"did", "sensorid", "sensor_timestamp", {3}
       from "sensor_data"
       where "did"='{0}'
       and "sensorid" = '{1}'
       and "sensor_timestamp" > '{2}'
       order by "sensor_timestamp"
       limit 10""".format(357139052213522, 902, 1463163952256, '"EXTRA_LEVEL", "EXTRA_SCALE", "EXTRA_HEALTH", ' \
         '"EXTRA_STATUS", "EXTRA_PLUGGED", "EXTRA_PRESENT", ' \
         '"EXTRA_VOLTAGE", "level_percent", "temperature_C", ' \
         '"EXTRA_TECHNOLOGY","EXTRA_TEMPERATURE"')

Python，phoenixdb - 没有得到一行（但也没有得到任何错误）

1 个答案: