我正在尝试使用一个我几乎不了解的数据库，我需要知道一个表的列名:
这是我尝试过的:
client = DataFrameClient(host, 8086, username, password, "marketdata")
client.switch_database('marketdata')
print(client.query("show measurements"))
# ResultSet({'('measurements', None)': [{'name': 'bookTicker'}]})
query = "SELECT COUNT(DISTINCT bookTicker) FROM information_schema.columns WHERE table_schema = 'marketdata'"
dataframes = client.query(query)
raise InfluxDBClientError(self.error)
influxdb.exceptions.InfluxDBClientError: retention policy not found: information_schema
我也试过:
query = "select * from bookTicker limit 10"
raise ChunkedEncodingError(e)
requests.exceptions.ChunkedEncodingError: ("Connection broken: InvalidChunkLength(got length b'', 0 bytes read)", InvalidChunkLength(got length b'', 0 bytes read))
最佳答案
您正在尝试将 SQL 知识用于非 SQL InfluxDB。
InfluxDB 没有列的概念，但有标签(在 SQL 中表示类似于索引列)和字段(类似于列)。
您可以通过查询来探索它们:
SHOW TAG KEYS [ON <database_name>] [FROM_clause] [WHERE <tag_key> ['<tag_value>' | <regular_expression>]] [LIMIT_clause] [OFFSET_clause]
https://docs.influxdata.com/influxdb/v1.7/query_language/schema_exploration/#show-tag-keys
SHOW FIELD KEYS [ON <database_name>] [FROM <measurement_name>]
https://docs.influxdata.com/influxdb/v1.7/query_language/schema_exploration/#show-field-keys
关于influxdb - 如何在 influxdb 中获取表的列名，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/68274418/