您好我正在创建一个应用程序，我希望将数据从移动设备发送到服务器。但问题是数据仅在服务器在线/ Up时反映在网站上。当服务器处于离线状态时，我得到响应400或502等数据只显示在移动屏幕上它没有反映在server.so我想创建Sqlite数据库，所以当我读取数据存储在数据库中，并希望上传数据，这是服务器成为online.this jon我想插入sqlite.i我是android的新手，所以我不知道如何将这个json插入sqlite.please任何人帮助我。谢谢先进
Button StartButton = (Button) findViewById(R.id.startButton);
StartButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
view.setVisibility(View.GONE);
}
});
答案 0 :(得分：1)
我的朋友只是做了以下事情：
定义此类，它将执行与数据库创建和操作相关的所有操作，并根据您的需要在此类中进行更改。
DatabaseHandler.java
public class DatabaseHandler extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "Demo";
private static final String TABLE_Demo = "demo";
private static final String KEY_ID = "id";
private static final String KEY_PATIENT_ID= "patientId";
private static final String KEY_ReadingType= "readingType";
private static final String KEY_DeviceMACId= "deviceMACId";
private static final String KEY_DeviceData = "deviceData ";
private static final String KEY_DeviceType= "deviceType";
String CREATE_DEMO_TABLE = "CREATE TABLE " + TABLE_Demo + "("+
KEY_ID + " INTEGER PRIMARY KEY,"+ KEY_ReadingType+ " INTEGER ,"
+ KEY_DeviceMACId + "TEXT,"+ KEY_DeviceData + " TEXT,"
+ KEY_DeviceType + " TEXT" + ")";
public DatabaseHandler(Context context) {
super(context, DATABASE_NAME, null,
}
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_DEMO_TABLE);
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_Demo );
onCreate(db);
}
void addJson(JsonObject json) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_PATIENT_ID, json.getString("patientId"));
values.put(KEY_ReadingType,json.getString("readingType"));
values.put(KEY_DeviceMACId, json.getString("deviceMACId"));
values.put(KEY_DeviceData , json.getString("deviceData"));
values.put(KEY_DeviceType, json.getString("deviceType"));
db.insert(TABLE_Demo , null, values);
db.close();
}
}
现在创建这个类的对象并将你的json对象存储到数据库中，如下所示：
DatabaseHandler db = new DatabaseHandler (context);
// context of your activity or fragment
try
{
db.addJson(JsonObject json);
//这里json是你需要保存在数据库中的json对象。 } catch（例外e） { }
答案 1 :(得分：0)
您可以为此json创建模型对象。然后，您可以将模型对象保存到数据库。尝试查找有关SQLite数据库的一些示例，并在项目中使用它。
答案 2 :(得分：0)
首先你尝试将一些json数据发布到server.So你从服务器得到的响应是up / not.So检查你的响应代码。如果响应代码不等于200，你将生成的json插入Sqlite数据库。经常检查与服务器的连接是否正常。如果服务器在线，则意味着从SqliteDB获取json数据并将其发布到服务器
Sqlite数据库的示例 http://www.androidhive.info/2011/11/android-sqlite-database-tutorial/ 连接服务器的示例 http://www.androidhive.info/2014/05/android-working-with-volley-library-1/ 使用volley库进行服务器连接可以获得
的错误响应答案 3 :(得分：0)
isUpdated extra的字段。线程函数[检查互联网可用性，如果互联网可用更新数据到远程数据库，则在更新成功时将sq-lite数据库中的isUpdated状态更新为true
主线程将定期更新本地sq-lite数据库，即使在没有互联网的情况下isUpdated状态为false
这可能对您有所帮助
使用this
检查网络可用性更新远程数据库需要Web服务
void PutRequest(String URL)
{
Ion.with(mContext)
.load("PUT",URL)
.setBodyParameter("name","foo")
.asString();
}
了解有关Ion
的更多信息答案 4 :(得分：0)
public class DataBase {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "demo";
private static final String TABLE_NAME = "device_data";
private static final String KEY_ID = "id";
private static final String KEY_PATIENT_ID = "patientId";
private static final String KEY_ReadingType = "readingType";
private static final String KEY_DeviceMACId = "deviceMACId";
private static final String KEY_DeviceData = "deviceData ";
private static final String KEY_DeviceType = "deviceType";
private static final String KEY_TimeStamp = "timeStamp";
private static final String KEY_AssetId = "assetId";
private static final String KEY_GeoLocationLattitude = "geoLocationLatitude";
private static final String KEY_GeoLocationLongitude = "geoLocationLongitude";
private static final String KEY_ClientId = "clientId";
private static final String KEY_DeviceRawData = "deviceRawData";
private final Context context;
private DataBaseHelper dbHelper;
public SQLiteDatabase db;
static final String DATABASE_CREATE = "create table " + TABLE_NAME + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_ReadingType + " INTEGER ,"
+ KEY_DeviceMACId + "TEXT," + KEY_DeviceData + " TEXT,"
+ KEY_DeviceType + " TEXT," + KEY_TimeStamp + "TEXT," + KEY_AssetId
+ "INTEGER," + KEY_GeoLocationLattitude + "TEXT,"
+ KEY_GeoLocationLongitude + "TEXT," + KEY_ClientId + "INTEGER,"
+ KEY_DeviceRawData + "TEXT" + ")";
public DataBase(Context _context) {
context = _context;
dbHelper = new DataBaseHelper(context, DATABASE_NAME, null,
DATABASE_VERSION);
}
public void onCreate(SQLiteDatabase db) {
db.execSQL(DATABASE_CREATE);
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
void addJson(JSONObject json) throws JSONException {
SQLiteDatabase db = dbHelper.getWritableDatabase();
ContentValues values = new ContentValues();
try {
values.put(KEY_PATIENT_ID, json.getString("patientId"));
values.put(KEY_ReadingType, json.getString("readingType"));
values.put(KEY_DeviceMACId, json.getString("deviceMACId"));
values.put(KEY_DeviceData, json.getString("deviceData"));
values.put(KEY_DeviceType, json.getString("deviceType"));
values.put(KEY_TimeStamp, json.getString("deviceType"));
values.put(KEY_AssetId, json.getString("deviceType"));
values.put(KEY_GeoLocationLattitude, json.getString("deviceType"));
values.put(KEY_GeoLocationLongitude, json.getString("deviceType"));
values.put(KEY_ClientId, json.getString("deviceType"));
values.put(KEY_DeviceRawData, json.getString("deviceType"));
} catch (JSONException e) {
// TODO Auto-generated catch block
System.out.println("JsonException........");
e.printStackTrace();
}
db.insert(TABLE_NAME, null, values);
db.close();
}
public DataBase open() throws SQLException {
db = dbHelper.getWritableDatabase();
return this;
}
public void close() {
db.close();
}
public SQLiteDatabase getDatabaseInstance() {
return db;
}
答案 5 :(得分：0)
@Dhiraj -i got exception..
08-01 12:05:45.447: I/System.out(4109): In try....com.example.healthdeviceprofilee.DataBase@42187568
08-01 12:05:45.447: I/System.out(4109): JsonException........
08-01 12:05:45.447: W/System.err(4109): org.json.JSONException: No value for patientId
08-01 12:05:45.447: W/System.err(4109): at org.json.JSONObject.get(JSONObject.java:355)
08-01 12:05:45.447: W/System.err(4109): at org.json.JSONObject.getString(JSONObject.java:515)
08-01 12:05:45.447: W/System.err(4109): at com.example.healthdeviceprofilee.DataBase.addJson(DataBase.java:59)
08-01 12:05:45.447: W/System.err(4109): at com.example.healthdeviceprofilee.DashboardActivity$RestConnection.onPostExecute(DashboardActivity.java:895)
08-01 12:05:45.447: W/System.err(4109): at com.example.healthdeviceprofilee.DashboardActivity$RestConnection.onPostExecute(DashboardActivity.java:1)
08-01 12:05:45.447: W/System.err(4109): at android.os.AsyncTask.finish(AsyncTask.java:632)
08-01 12:05:45.447: W/System.err(4109): at android.os.AsyncTask.access$600(AsyncTask.java:177)
08-01 12:05:45.447: W/System.err(4109): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
08-01 12:05:45.447: W/System.err(4109): at android.os.Handler.dispatchMessage(Handler.java:102)
08-01 12:05:45.447: W/System.err(4109): at android.os.Looper.loop(Looper.java:136)
08-01 12:05:45.447: W/System.err(4109): at android.app.ActivityThread.main(ActivityThread.java:5017)
08-01 12:05:45.458: W/System.err(4109): at java.lang.reflect.Method.invokeNative(Native Method)
08-01 12:05:45.458: W/System.err(4109): at java.lang.reflect.Method.invoke(Method.java:515)
08-01 12:05:45.458: W/System.err(4109): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
08-01 12:05:45.458: W/System.err(4109): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
08-01 12:05:45.458: W/System.err(4109): at dalvik.system.NativeStart.main(Native Method)
08-01 12:05:45.458: E/SQLiteLog(4109): (1) near "null": syntax error
08-01 12:05:45.458: E/SQLiteDatabase(4109): Error inserting
08-01 12:05:45.458: E/SQLiteDatabase(4109): android.database.sqlite.SQLiteException: near "null": syntax error (code 1): , while compiling: INSERT INTO device_data(null) VALUES (NULL)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1467)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1339)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at com.example.healthdeviceprofilee.DataBase.addJson(DataBase.java:77)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at com.example.healthdeviceprofilee.DashboardActivity$RestConnection.onPostExecute(DashboardActivity.java:895)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at com.example.healthdeviceprofilee.DashboardActivity$RestConnection.onPostExecute(DashboardActivity.java:1)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at android.os.AsyncTask.finish(AsyncTask.java:632)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at android.os.AsyncTask.access$600(AsyncTask.java:177)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at android.os.Handler.dispatchMessage(Handler.java:102)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at android.os.Looper.loop(Looper.java:136)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at android.app.ActivityThread.main(ActivityThread.java:5017)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at java.lang.reflect.Method.invokeNative(Native Method)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at java.lang.reflect.Method.invoke(Method.java:515)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
08-01 12:05:45.458: E/SQLiteDatabase(4109): at dalvik.system.NativeStart.main(Native Method)