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transform.py
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transform.py
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import pywraps2 as s2
import pandas as pd
import sqlite3
btree = False
if btree:
conn = sqlite3.connect('restaurants.db')
df = pd.read_csv('restaurants.csv')
table = """
CREATE TABLE IF NOT EXISTS Location (
ID INTEGER PRIMARY KEY AUTOINCREMENT,
CellId CHAR(17) NOT NULL,
LocationName TEXT NOT NULL,
Lat REAL NOT NULL,
Long REAL NOT NULL,
Level INTEGER NOT NUll
);
"""
if conn:
print('Connection successfully established.')
# Create table.
conn.execute(table)
# Create B-Tree index on CellId
if conn.execute("CREATE INDEX IF NOT EXISTS cellid_btree ON Location(CellId);"):
print('Index successfully Created.')
for i in range(len(df)):
name = df.iloc[i, 6]
lat = df.iloc[i, 4]
lng = df.iloc[i, 5]
level = 10
cell_id = s2.S2CellId(s2.S2LatLng.FromDegrees(lat, lng)).parent(level).ToToken()
conn.execute("INSERT INTO Location (CellId, LocationName, Lat, Long, Level) VALUES(?, ?, ?, ?, ?)", (cell_id, name, lat, lng, level))
# Commit the database transaction
conn.commit()
# print(name, lat, lng)
conn.close()
else:
conn = sqlite3.connect('restaurants_rtree.db')
df = pd.read_csv('restaurants.csv')
table = """
CREATE VIRTUAL TABLE Location_rtree USING FTS5(CellId, LocationName, Lat, Long, Level);
"""
if conn:
print('Connection successfully established.')
# Create table.
conn.execute(table)
for i in range(len(df)):
name = df.iloc[i, 6]
lat = df.iloc[i, 4]
lng = df.iloc[i, 5]
level = 10
cell_id = s2.S2CellId(s2.S2LatLng.FromDegrees(lat, lng)).parent(level).ToToken()
conn.execute("INSERT INTO Location (CellId, LocationName, Lat, Long, Level) VALUES(?, ?, ?, ?, ?)", (cell_id, name, lat, lng, level))
# Commit the database transaction
conn.commit()
conn.close()