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本文实例讲述了Python SQL查询并生成json文件操作。分享给大家供大家参考，具体如下：

1. 数据准备

SQL数据点击此处本站下载。

2. python代码

import datetime 
import os
import mssqlhelper
ms = mssqlhelper.MSSQL(host="192.168.0.108", user="sa", pwd="sa", db="ComPrject")
def getAreas(cityid):
  arealist=ms.ExecQuery("select *From dbo.areas where cityid='%s' " % cityid)
  return arealist
def getCity(provinces):
  citylist=ms.ExecQuery("select *From dbo.cities where provinceid='%s'" % provinces)
  return citylist
def getProvinces():
  provlist=ms.ExecQuery("select *From dbo.provinces")
  return provlist
def createFileJson():
  date=datetime.datetime.now().strftime('%Y-%m-%d')
  path=date+'-provinces.json'
  return path
def writeJson(path):
  provlist=getProvinces()
  with open(path,"w+",encoding="utf-8") as f:
    f.write("[")
    lp = 0
    for p in provlist:
      if lp>0:
        f.write(",\n")
      else:
        f.write("\n")
      f.write("{\n")
      f.write('"Code":"%s"\n'% p[1])
      f.write(',"Name":"%s"\n'% p[2])
      f.write(',Nodes:[\n')
      citylist=getCity(p[1])
      lc = 0
      for c in citylist:
        if lc>0:
          f.write("\t,\n")
        else:
          f.write("\n")
        f.write("\t{\n")
        f.write('\t"Code":"%s"\n'% c[1])
        f.write('\t,"Name":"%s"\n'% c[2])
        f.write('\t,Nodes:[\n')
        arealist = getAreas(c[1])
        la = 0
        for a in arealist:
          if la>0:
            f.write("\t\t,\n")
          else:
            f.write("\n")
          f.write("\t\t{\n")
          f.write('\t\t"Code":"%s"\n'% a[1])
          f.write('\t\t,"Name":"%s"\n'% a[2])
          f.write("\t\t}\n")
          la += 1
        f.write("\t]\n")
        f.write("\t}\n")
        lc += 1
      f.write("]\n")
      f.write("}\n")
      lp += 1
    f.write("]\n")
if __name__ == '__main__':
  path=createFileJson()
  writeJson(path)

3.生成预览