簡單說說如何把json或者txt文件轉換爲db

前言

最近在Github上找到一箇中國城市的json文件,雖然也有db文件,但是想通過這個json文件生成自己的數據庫表。下面就簡單來轉換成自己的數據庫

準備json

Github找到一個下面json

[
  {
    "areaId" : "4521984",
    "areaName" : "北京",
    "cities" : [
      {
        "areaId" : "4521985",
        "areaName" : "北京市",
        "counties" : [
          {
            "areaId" : "4521986",
            "areaName" : "東城區"
          },
          {
            "areaId" : "4521987",
            "areaName" : "西城區"
          },
          {
            "areaId" : "4521988",
            "areaName" : "朝陽區"
          },
          {
            "areaId" : "4521989",
            "areaName" : "豐臺區"
          },
          {
            "areaId" : "4521990",
            "areaName" : "石景山區"
          },
          {
            "areaId" : "4521991",
            "areaName" : "海淀區"
          },
          {
            "areaId" : "4521992",
            "areaName" : "門頭溝區"
          },
          {
            "areaId" : "4521993",
            "areaName" : "房山區"
          },
          {
            "areaId" : "4521994",
            "areaName" : "通州區"
          },
          {
            "areaId" : "4521995",
            "areaName" : "順義區"
          },
          {
            "areaId" : "4521996",
            "areaName" : "昌平區"
          },
          {
            "areaId" : "4521997",
            "areaName" : "大興區"
          },
          {
            "areaId" : "4521998",
            "areaName" : "懷柔區"
          },
          {
            "areaId" : "4521999",
            "areaName" : "平谷區"
          },
          {
            "areaId" : "4522001",
            "areaName" : "密雲縣"
          },
          {
            "areaId" : "4522002",
            "areaName" : "延慶縣"
          }
        ]
      }
    ]
  }
....
]

完整的json文件可Goach_Frameapp 裏面的assets裏面查看

轉換爲相對格式的txt文件

把上文的json文件相對的City.txt文件

0,4521984,0,北京
1,4522003,0,天津
2,4522022,0,河北
3,4522217,0,山西
4,4522359,0,內蒙古
5,4522482,0,遼寧
6,4522611,0,吉林
7,4522689,0,黑龍江
8,4522847,0,上海
9,4522868,0,江蘇
10,4523000,0,浙江
..........

代碼如下:

rxPermissions.request(Manifest.permission.WRITE_EXTERNAL_STORAGE,
                    Manifest.permission.READ_EXTERNAL_STORAGE)
                    .subscribe({
                        t: Boolean ->
                        if(t){
                            val cityJson = AssetsUtils.getStringForAssets(context,"city.txt")
                            val mCitys = mGson.fromJson<List<CityResponse>>(cityJson,object: TypeToken<List<CityResponse>>(){}.type)
                            val stringBuilder = StringBuilder()
                            //省
                            mCitys.forEachIndexed { index, cityResponse ->
                                stringBuilder.append("$index,${cityResponse.areaId},0,${cityResponse.areaName}\n")
                            }
                            var cityCount = mCitys.size
                            //市
                            mCitys.forEach {
                                val parentId = it.areaId
                                it.cities.forEachIndexed { index, city ->
                                    stringBuilder.append("${cityCount+index},${city.areaId},$parentId,${city.areaName}\n")
                                }
                                cityCount += it.cities.size
                            }
                            //區,縣
                            mCitys.forEach {
                                it.cities.forEach {
                                    val parentId = it.areaId
                                    it.counties.forEachIndexed { index, city ->
                                        stringBuilder.append("${cityCount+index},${city.areaId},$parentId,${city.areaName}\n")
                                    }
                                    cityCount += it.counties.size
                                }
                            }
                            AssetsUtils.stringToFile(context,"City.txt",stringBuilder.toString())
                        }
                    })

AssetsUtils.kt

object AssetsUtils {

    fun getStringForAssets(context: Context,name:String):String{
        try {
            val inputStream = context.assets.open(name)
            val br = BufferedReader(InputStreamReader(inputStream))
            val sb = StringBuffer()
            var len = br.readLine()
            while(len != null){
                sb.append(len)
                len = br.readLine()
            }
            inputStream.close()
            return sb.toString()
        }catch (e:FileNotFoundException){
            e.printStackTrace()
        }
        return ""
    }
    fun stringToFile(context: Context,fileName: String,saveStr:String){
        val file = File(getSaveDir(context,"City"),fileName)
        if(!file.exists()||file.length() == 0L){
            file.deleteOnExit()
            file.createNewFile()
            file.outputStream().use { it.write(saveStr.toByteArray(Charsets.UTF_8)) }
        }
    }
    private fun getSaveDir(context: Context,uniqueName:String):File{
        val cachePath: String
        val file = context.getExternalFilesDir(null)
        cachePath = if (file != null && (Environment.MEDIA_MOUNTED == Environment.getExternalStorageState() || !Environment.isExternalStorageRemovable())) {
            file.path
        } else {
            context.filesDir.path
        }
        val targetFile = File(cachePath + File.separator + uniqueName)
        if(!targetFile.exists()) targetFile.mkdirs()
        return targetFile
    }
}

CityResponse.kt

class CityResponse:Serializable{
    var areaId:Long = 0
    var areaName:String = ""
    var cities:List<City> = emptyList()
    class City(val areaId:Long, val areaName:String,val counties:List<Town>):Serializable
    class Town(val areaId:Long, val areaName:String):Serializable
}

生成city.db

這時候需要準備一臺已經root的手機或者安裝可以root的模擬器,這裏使用夜神模擬器來做相應的操作
- 首先在Terminal裏把city.txt文件push到相對應用的databases路徑下,如這裏我的路徑是

adb push E:/City.txt data/data/com.goach.client/databases

第一個路徑是txt放在電腦上的路徑,第二個路徑需要push的位置。
執行命令成功後
執行命令.png

就可以在data/data/com.goach.client/databases看到City.txt文件
image.png

然後執行下面幾個命令創建db

adb shell
cd data/data/com.goach.client/databases
sqlite3 City.db

執行成功如下
image.png

然後創建City表,執行命令和結果如下
創建<code>City</code>表.png

.table是查看當前db裏面存在的表

最後把City.txt導入到表裏面
db.png
通過,分割,然後導入表裏面就可以了。在databases裏面可以查看City.db
結果.png

然後把db導出到電腦,最後表如下
image.png

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