How to dynamic plot with data from database instead of .txt? - python-3.x

Question

I have a code that mimics a sensor, putting random values and timestamps on a txt file. From this file, being constantly updated, I can dynamic plot those values. Now my idea is to do the same thing, but getting data from a database. I'm already able to save whatever data comes for my server into the database. The thing now is the dynamic plot area.
My code for saving data into the table:
while True:
data = conn.recv(2048).decode('utf-8')
if not data:
break
#print('Servidor recebeu :', repr(data))
t = dt.datetime.now().strftime('%H:%M:%S')
c.execute('INSERT INTO edgedata VALUES (?,?)', (data, t))
con.commit()
My code for dynamic plotting from .txt file:
#!/usr/bin/env python
import matplotlib.pyplot as plt
import matplotlib.animation as animation
import numpy as np
fig = plt.figure()
ax1 = fig.add_subplot(1,1,1)
def animate(i):
print("inside animate")
pullData = open("datatest.txt","r").read()
dataArray = pullData.split('\n')
xar = []
yar = []
for eachLine in dataArray:
if len(eachLine)>1:
x,y = eachLine.split(',')
xar.append(str(x))
yar.append(float(y))
ax1.clear()
ax1.plot(xar,yar)
plt.xlabel('Hora')
plt.xticks(rotation=45, ha='right')
plt.subplots_adjust(bottom=0.30)
plt.ylabel('Valor Dado')
plt.title('Pseudo-Sensor x Hora')
ani = animation.FuncAnimation(fig, animate, interval=1000)
plt.show()
Any help will be appreciated. Thanks in advance!

Answer 1

This code did the job for me. Thanks
fig = plt.figure()
ax1 = fig.add_subplot(1,1,1)
def animate(i):
print("inside animate")
con = sqlite3.connect('edgedb')
c = con.cursor()
c.execute('SELECT data, timestamp FROM edgedata')
data = c.fetchall()
datas = []
dates = []
for row in data:
datas.append(row[1])
dates.append(float(row[0]))
ax1.clear()
ax1.plot_date(datas,dates,'-')
plt.xlabel('Hora')
plt.xticks(rotation=45, ha='right')
plt.subplots_adjust(bottom=0.30)
plt.ylabel('Valor Dado')
plt.title('Pseudo-Sensor x Hora')
ani = animation.FuncAnimation(fig, animate, interval=1000)
plt.show()