我有一个调用远程服务器并从中获取数据的 Android 服务，我将数据存储在 SQLite 数据库中，一切正常，但是当我不调用该服务并在模拟器中再次执行时，我发现所有存储的数据消失了，数据库为空，是因为我在模拟器中运行项目并且它只将数据保存在某种缓存中吗？
谢谢
编辑
当我第二次运行该应用程序时，数据似乎在那里，但第三次它消失了。有时数据会在第二次或第四次运行时被擦除。
这是我的 Openhelper
public class DataBaseHelper extends SQLiteOpenHelper {
static final String dbName="DBlite2";
static final String tableMagasin= "magasin";
static final String tablenotif= "notification";
static final String tabletemp= "temporaire";
//colonnes de la table magasin
static final String colNomMag= "nomMag";
static final String colCategorie="categorie";
static final String colVille="ville";
static final String colAdresse="adresse";
static final String collat="latitude";
static final String collon="longitude";
static final String colDescr="description";
static final String colFavoris= "favori";
//colonnes de la table notifications
static final String colidNotif= "idnotif";
static final String colcontenu= "contenu";
static final String coldate= "datenotif";
static final String colvalidite= "validite";
static final String colnmnotif= "nmnotif";
static final String colctnotif= "ctnotif";
static final String colvlnotif= "vlnotif";
public DataBaseHelper(Context context)
{
super(context,dbName ,null,1);
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
//création de la table magasin
db.execSQL("CREATE TABLE "+tableMagasin+"("+colNomMag+" TEXT, "+ colCategorie +
" TEXT, "+ colVille+" TEXT, "+colAdresse + " TEXT, "+ collat +
" FLOAT, " + collon +" FLOAT, "+ colDescr+ " TEXT, " +
colFavoris + " BIT, PRIMARY KEY ( "+colNomMag+ " , "+colCategorie+" , "+colVille+" ));");
//création de la table notification
db.execSQL("CREATE TABLE "+tablenotif+"("+colidNotif+" INTEGER PRIMARY KEY,"+ colcontenu+" TEXT, "+coldate+" DATETIME, "
+colvalidite+" INTEGER, "+colnmnotif+" TEXT, "+colctnotif+" TEXT, "+colvlnotif+" TEXT, FOREIGN KEY ("
+colnmnotif+") REFERENCES "+tableMagasin+" ( "+colNomMag+" ), FOREIGN KEY ( "+colctnotif+" ) REFERENCES "
+tableMagasin+" ( "+colCategorie +" ), FOREIGN KEY("+ colvlnotif + ") REFERENCES "+ tableMagasin + " ("+ colVille+ "));");
//création de la table tomporaire
db.execSQL("CREATE TABLE "+tabletemp+"("+colidNotif+" INTEGER PRIMARY KEY,"+ colcontenu+" TEXT, "+coldate+" DATETIME, "
+colvalidite+" INTEGER, "+colnmnotif+" TEXT, "+colctnotif+" TEXT, "+colvlnotif+" TEXT, FOREIGN KEY ("
+colnmnotif+") REFERENCES "+tableMagasin+" ( "+colNomMag+" ), FOREIGN KEY ( "+colctnotif+" ) REFERENCES "
+tableMagasin+" ( "+colCategorie +" ), FOREIGN KEY("+ colvlnotif + ") REFERENCES "+ tableMagasin + " ("+ colVille+ "));");
}
@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public String toString()
{
return (colNomMag + "\nCatégorie:" + colCategorie+ "\nVille:"+colVille);
}
}
而我在其中进行插入的班级，更新了删除：
public class MagasinDataSource {
private SQLiteDatabase db;
private DataBaseHelper dbhelper;
private String[] allcolumns = {DataBaseHelper.colNomMag,DataBaseHelper.colCategorie, DataBaseHelper.colVille,
DataBaseHelper.colAdresse,DataBaseHelper.collat,DataBaseHelper.collon,DataBaseHelper.colDescr,DataBaseHelper.colFavoris};
private String[] notifcol={DataBaseHelper.colidNotif, DataBaseHelper.colcontenu, DataBaseHelper.coldate, DataBaseHelper.colvalidite,
DataBaseHelper.colnmnotif,DataBaseHelper.colctnotif,DataBaseHelper.colvlnotif};
public MagasinDataSource(Context context)
{
this.dbhelper= new DataBaseHelper(context);
}
public void open() throws SQLException {
db = dbhelper.getWritableDatabase();
}
public void close() {
dbhelper.close();
}
public long insertMag(Magasin ma)
{
ContentValues values = new ContentValues();
values.put(DataBaseHelper.colNomMag, ma.getNomMag());
values.put(DataBaseHelper.colCategorie, ma.getCat());
values.put(DataBaseHelper.colVille, ma.getVille());
values.put(DataBaseHelper.colAdresse, ma.getAdr());
values.put(DataBaseHelper.colDescr, ma.getDescr());
values.put(DataBaseHelper.colFavoris, ma.isFav());
values.put(DataBaseHelper.collat, ma.getLat());
values.put(DataBaseHelper.collon, ma.getLon());
return db.insert(DataBaseHelper.tableMagasin, null, values);
}
public long insertNotif(Notif n)
{
ContentValues values = new ContentValues();
values.put(DataBaseHelper.colidNotif, n.getId_notif());
values.put(DataBaseHelper.colcontenu, n.getContenu());
//values.put(DataBaseHelper.coldate, n.getDatenotif());
values.put(DataBaseHelper.colvalidite, n.getValidite());
values.put(DataBaseHelper.colnmnotif, n.getNmag());
values.put(DataBaseHelper.colctnotif, n.getCtmag());
values.put(DataBaseHelper.colvlnotif, n.getVlmag());
return db.insert(DataBaseHelper.tablenotif, null, values);
}
public long inserttemp(Notif n)
{
ContentValues values = new ContentValues();
values.put(DataBaseHelper.colidNotif, n.getId_notif());
values.put(DataBaseHelper.colcontenu, n.getContenu());
//values.put(DataBaseHelper.coldate, n.getDatenotif());
values.put(DataBaseHelper.colvalidite, n.getValidite());
values.put(DataBaseHelper.colnmnotif, n.getNmag());
values.put(DataBaseHelper.colctnotif, n.getCtmag());
values.put(DataBaseHelper.colvlnotif, n.getVlmag());
return db.insert(DataBaseHelper.tabletemp, null, values);
}
public void deleteMag(Magasin ma)
{
db.delete(DataBaseHelper.tableMagasin, DataBaseHelper.colNomMag +" =?" + " AND "+ DataBaseHelper.colCategorie+" =?"+ " AND "+ DataBaseHelper.colVille+" =?", new String []{String.valueOf(ma.getNomMag()),String.valueOf(ma.getCat()),String.valueOf(ma.getVille())});
}
public void deleteAllnotif()
{
db.delete(DataBaseHelper.tablenotif, null, null);
}
public void deleteAlltemp()
{
db.delete(DataBaseHelper.tabletemp, null, null);
}
public void deletAllmag()
{
db.delete(DataBaseHelper.tableMagasin, null, null);
}
public void updateMag(Magasin ma)
{
ContentValues values = new ContentValues();
values.put(DataBaseHelper.colNomMag, ma.getNomMag());
values.put(DataBaseHelper.colCategorie, ma.getCat());
values.put(DataBaseHelper.colVille, ma.getVille());
values.put(DataBaseHelper.colAdresse, ma.getAdr());
values.put(DataBaseHelper.colDescr, ma.getDescr());
values.put(DataBaseHelper.colFavoris, ma.isFav());
db.update(DataBaseHelper.tableMagasin, values, DataBaseHelper.colNomMag +" =? AND "+DataBaseHelper.colCategorie+" =? AND "+DataBaseHelper.colVille+" =?" ,new String []{String.valueOf(ma.getNomMag()),String.valueOf(ma.getCat()),String.valueOf(ma.getVille())});
// + " AND "+ DataBaseHelper.colCategorie+" = "+ct+ " AND "+ DataBaseHelper.colVille+" = "+ vl,null);
// db.execSQL("UPDATE "+ DataBaseHelper.tableMagasin+" SET "+DataBaseHelper.colNomMag+" = "+ma.getNomMag()+" , "+DataBaseHelper.colCategorie+" = "+ma.getCat()+" , "+DataBaseHelper.colVille+" = "+ma.getVille()+" , "+DataBaseHelper.colAdresse+" = "+ma.getAdr()+
// " , "+DataBaseHelper.colDescr+" = "+ma.getDescr()+" , "+DataBaseHelper.colVille+" = "+ma.isFav()+" WHERE "+DataBaseHelper.colNomMag+" = "+ma.getNomMag()+" AND "+DataBaseHelper.colCategorie+" = "+ma.getCat()+" AND "+DataBaseHelper.colVille+" = "+ma.getVille());
}
public List<Magasin> getFavoris()
{
List<Magasin> lstfavoris = new ArrayList<Magasin>();
String getfav= "select * from magasin where favori=1";
Cursor cursor= db.rawQuery(getfav, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
Magasin magasin= cursorToMagasin(cursor);
lstfavoris.add(magasin);
cursor.moveToNext();
}
cursor.close();
return lstfavoris;
}
public List<Notif> getGeoloc(float latitude, float longitude)
{
List<Magasin> lstgeo= new ArrayList<Magasin>();
List<Notif> lstnotif= new ArrayList<Notif>();
float latinf= latitude - (float) 0.5;
float latsup= latitude + (float) 0.5;
float loninf= longitude - (float) 0.5;
float lonsup= longitude + (float) 0.5;
String requete="select * from magasin where latitude > "+String.valueOf(latinf)+" and latitude < "+String.valueOf(latsup)+
" and longitude > "+String.valueOf(loninf)+" and longitude < "+ String.valueOf(lonsup);
// String requete="select * from magasin where favori=1";
// String requete="select * from notification";
Cursor cursor= db.rawQuery(requete, null);
cursor.moveToFirst();
while (!cursor.isAfterLast())
{
Magasin mag= cursorToMagasin(cursor);
lstgeo.add(mag);
cursor.moveToNext();
}
cursor.close();
for(int i=0;i<lstgeo.size();i++)
{
String nm= lstgeo.get(i).getNomMag();
String ct= lstgeo.get(i).getCat();
String vl= lstgeo.get(i).getVille();
String requete2="select * from notification where nmnotif = '"+nm+"' and ctnotif = '"+ct+"' and vlnotif = '"+vl+"'";
Cursor cursor2= db.rawQuery(requete2, null);
cursor2.moveToFirst();
while (!cursor2.isAfterLast())
{
Notif notif= cursorToNotif(cursor2);
lstnotif.add(notif);
cursor2.moveToNext();
}
cursor2.close();
}
return lstnotif;
}
public List<Magasin> getAll()
{
List<Magasin> lstall = new ArrayList<Magasin>();
Cursor cursor= db.query(DataBaseHelper.tableMagasin,allcolumns, null, null, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
Magasin magasin= cursorToMagasin(cursor);
lstall.add(magasin);
cursor.moveToNext();
}
cursor.close();
return lstall;
}
public boolean existeMag(String nm,String ct,String vl)
{
List<Magasin> lst= new ArrayList<Magasin>();
lst= getAll();
boolean b=false;
String nom;
String cat;
String ville;
for(int i=0;i<lst.size();i++)
{
nom= lst.get(i).getNomMag();
cat= lst.get(i).getCat();
ville=lst.get(i).getVille();
if((nm.equals(nom)) && (ct.equals(cat)) && (vl.equals(ville)))
{
b=true;
break;
}
}
return b;
}
public Magasin getMagasin(String nm,String ct,String vl)
{
List<Magasin> lst= new ArrayList<Magasin>();
Magasin m= new Magasin();
lst=getAll();
String nom;
String cat;
String ville;
for(int i=0;i<lst.size();i++)
{
nom= lst.get(i).getNomMag();
cat= lst.get(i).getCat();
ville=lst.get(i).getVille();
if((nm.equals(nom)) && (ct.equals(cat)) && (vl.equals(ville)))
{
m=lst.get(i);
break;
}
}
return m;
}
public boolean existeNotif(Notif notif)
{
List<Notif> lst= new ArrayList<Notif>();
lst=getAllNotif();
boolean b=false;
for(int i=0;i<lst.size();i++)
{
Notif s= new Notif();
s=lst.get(i);
if(notif.getId_notif()==s.getId_notif())
{
b=true;
break;
}
}
return b;
}
public boolean existetemp(Notif notif)
{
List<Notif> lst= new ArrayList<Notif>();
lst=getAlltemp();
boolean b=false;
for(int i=0;i<lst.size();i++)
{
Notif s= new Notif();
s=lst.get(i);
if(notif.getId_notif()==s.getId_notif())
{
b=true;
break;
}
}
return b;
}
public List<Notif> getAllNotif()
{
List<Notif> lstnotif= new ArrayList<Notif>();
Cursor cursor= db.query(DataBaseHelper.tablenotif,notifcol, null, null, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
Notif s= cursorToNotif(cursor);
lstnotif.add(s);
cursor.moveToNext();
}
cursor.close();
return lstnotif;
}
public List<Notif> getAlltemp()
{
List<Notif> lstnotif= new ArrayList<Notif>();
Cursor cursor= db.query(DataBaseHelper.tabletemp,notifcol, null, null, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
Notif s= cursorToNotif(cursor);
lstnotif.add(s);
cursor.moveToNext();
}
cursor.close();
return lstnotif;
}
private Magasin cursorToMagasin(Cursor cursor) {
Magasin magasin = new Magasin();
magasin.setNomMag(cursor.getString(0));
magasin.setCat(cursor.getString(1));
magasin.setVille(cursor.getString(2));
magasin.setAdr(cursor.getString(3));
magasin.setLat(cursor.getFloat(4));
magasin.setLon(cursor.getFloat(5));
magasin.setDescr(cursor.getString(6));
magasin.setFav(cursor.getInt(7)==1);
return magasin;
}
private Notif cursorToNotif(Cursor cursor)
{
Notif n= new Notif();
n.setId_notif(cursor.getInt(0));
n.setContenu(cursor.getString(1));
//n.setDatenotif(cursor.getString(2));
n.setValidite(cursor.getInt(3));
n.setNmag(cursor.getString(4));
n.setCtmag(cursor.getString(5));
n.setVlmag(cursor.getString(6));
return n;
}
}
编辑2
这是我的服务代码：
public class SyncService extends Service {
private MagasinDataSource datasource;
protected LocationManager locationManager;
public static ShopAlertActivity MAIN_ACTIVITY;
private Timer timer=new Timer();
private static long UPDATE_INTERVAL = 86400000; //default
private static long DELAY_INTERVAL = 10000;
public static void setMainActivity(ShopAlertActivity activity)
{
MAIN_ACTIVITY = activity;
}
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate()
{
SharedPreferences SP = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
String interval= SP.getString("synchronisation", "1");
if(interval.equals("1")) UPDATE_INTERVAL= 43200000;
if(interval.equals("2")) UPDATE_INTERVAL= 86400000;
if(interval.equals("3")) UPDATE_INTERVAL= 115200000;
super.onCreate();
_startService();
// if (MAIN_ACTIVITY != null) Log.d(getClass().getSimpleName(), "FileScannerService started");
}
/*
* starting the service
*/
private void _startService()
{
timer.scheduleAtFixedRate(
new TimerTask() {
public void run() {
try{
doServiceWork();
Thread.sleep(UPDATE_INTERVAL);
}catch(InterruptedException ie){
Log.e(getClass().getSimpleName(), "FileScannerService InterruptedException"+ie.toString());
}
}
},
DELAY_INTERVAL,
UPDATE_INTERVAL);
Log.i(getClass().getSimpleName(), "FileScannerService Timer started....");
}
/*
* start the processing, the actual work, getting config params, get data from network etc
*/
private void doServiceWork()
{
//avoir les préférences
SharedPreferences SP = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
String interval= SP.getString("synchronisation", "1");
if(interval.equals("1")) UPDATE_INTERVAL= 43200000;
if(interval.equals("2")) UPDATE_INTERVAL= 86400000;
if(interval.equals("3")) UPDATE_INTERVAL= 115200000;
try{
//call the distant web service
soapclass sc= new soapclass("TabMag");
soapclass cs= new soapclass("TabNotif");
Magasin[] tab_mag=sc.get_table_magasin();
Notif[] tab_notif=cs.get_table_notif();
datasource = new MagasinDataSource(this);
datasource.open();
//Delete existing data
if(tab_mag.length>0)
{
// datasource.deletAllmag();
// datasource.deleteAllnotif();
}
//Insert data received from web service in table magasin
for(int i=0;i<tab_mag.length;i++)
{
Magasin m= new Magasin();
m=tab_mag[i];
if(lst_fav.contains(m))
{
m.setFav(true);
}
datasource.insertMag(m);
}
//insert data in tab_notif
for(int i=0;i<tab_notif.length;i++)
{
Notif n= new Notif();
n= tab_notif[i];
datasource.insertNotif(n);
}
datasource.close();
}
catch(Exception e)
{
}
}
/*
* shutting down the service
*/
private void _shutdownService()
{
if (timer != null) timer.cancel();
// Log.i(getClass().getSimpleName(), "Timer stopped...");
}
}