Python读取SQLite数据库数据写入csv

import sqlite3
import bd_gc_84
import csv
import time

start =time.clock()
print("正在运行..................")

#新建csv文件
file = open('dezhou.csv', 'w', encoding='utf-8', newline="")
csv_writer = csv.writer(file)
csv_writer.writerow(["x","y","count","cityId","date"])

#打开数据库
con = sqlite3.connect("E:\BaiDuMap\hydata.db") 
c = con.cursor()
i = 0

for row in c.execute("select * from heatmapdata where cityId = 372"):
    # if i >= 100000:
    #     break
    # print(row)
    #百度墨卡托转百度经纬度
    bd09mcTobd09ll = bd_gc_84.mercatortobd09(row[0],row[1])
    # print(bd09mcTobd09ll)

    #百度经纬度转国测
    bd09togc = bd_gc_84.bd09togcj02(bd09mcTobd09ll[0],bd09mcTobd09ll[1])
    # print(bd09togc)

    #国测转84
    gcto84 = bd_gc_84.gcj02towgs84(bd09togc[0],bd09togc[1])
    # print(gcto84)

    #写入文件
    csv_writer.writerow([gcto84[0],gcto84[1],row[2],row[3],row[4]])
    
    i = i + 1

    #利用百度接口进行转换
    # url = "https://api.map.baidu.com/geoconv/v1/?coords=" + x + "," + y + "&from=6&to=3&ak=TAnwBKfyivSOa4iqeO6Gw6lRhNF3zKel"
    # print (url)

#关闭文档
file.close()
print("运行结束！")

#关闭数据库
c.close()
con.close()
print("转换数据总量：" + str(i))

end = time.clock()
print("运行时间:" + "%.3f"%(end-start)+"秒")