28 lines
1019 B
Python
28 lines
1019 B
Python
import sqlite3
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class Database():
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def __init__(self, db_file):
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self.db_file = db_file
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self._create_table()
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def _create_table(self):
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with sqlite3.connect(self.db_file) as conn:
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cursor = conn.cursor()
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cursor.execute('''CREATE TABLE IF NOT EXISTS timeseries
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(timestamp INTEGER PRIMARY KEY, value REAL)''')
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conn.commit()
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def insert_data(self, timestamp, value):
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with sqlite3.connect(self.db_file) as conn:
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cursor = conn.cursor()
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cursor.execute('''INSERT INTO timeseries (timestamp, value)
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VALUES (?, ?)''', (timestamp, value))
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conn.commit()
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def fetch_data(self, limit):
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with sqlite3.connect(self.db_file) as conn:
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cursor = conn.cursor()
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cursor.execute('''SELECT timestamp, value FROM timeseries
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ORDER BY timestamp DESC LIMIT ?''', (limit,))
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return cursor.fetchall()
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