20 lines
709 B
Python
20 lines
709 B
Python
import pandas
|
|
from sqlalchemy import create_engine
|
|
|
|
engine = create_engine("taos://root:taosdata@localhost:6030/power")
|
|
df = pandas.read_sql("SELECT * FROM meters", engine)
|
|
|
|
# print index
|
|
print(df.index)
|
|
# print data type of element in ts column
|
|
print(type(df.ts[0]))
|
|
print(df.head(3))
|
|
|
|
# output:
|
|
# RangeIndex(start=0, stop=8, step=1)
|
|
# <class 'pandas._libs.tslibs.timestamps.Timestamp'>
|
|
# ts current voltage phase location groupid
|
|
# 0 2018-10-03 14:38:05.000 10.3 219 0.31 beijing.chaoyang 2
|
|
# 1 2018-10-03 14:38:15.000 12.6 218 0.33 beijing.chaoyang 2
|
|
# 2 2018-10-03 14:38:16.800 12.3 221 0.31 beijing.chaoyang 2
|