Is it possible to copy the .db file such as mmssms.db or user_dict.db to the SDCard?
If it is possible then all I need to do is, read the db file and write it to the SDCard.
You could start with this sample:
try {
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
if (sd.canWrite()) {
String currentDBPath = "\\data\\{package name}\\databases\\{database name}";
String backupDBPath = "{database name}";
File currentDB = new File(data, currentDBPath);
File backupDB = new File(sd, backupDBPath);
if (currentDB.exists()) {
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
}
}
} catch (Exception e) {
// exception
}
// Local database
InputStream input = new FileInputStream(from);
// create directory for backup
File dir = new File(DB_BACKUP_PATH);
dir.mkdir();
// Path to the external backup
OutputStream output = new FileOutputStream(to);
// transfer bytes from the Input File to the Output File
byte[] buffer = new byte[1024];
int length;
while ((length = input.read(buffer))>0) {
output.write(buffer, 0, length);
}
output.flush();
output.close();
input.close();
Related
In my App i need to implement restoring room database that i have exported to local storage. i have managed to copy all 03 database files (.db -shm and wal) using get getDatabasePath(DATABASE_NAME).getAbsolutePath(). For replacing it back, i am copying these exported files back to original database path, which works fine, but no data is showing when i access it from inside the app. The exported database is clearly showing all the table with DB Browser tool. I am not sure why its not working.This is a backup button, which generates backup files. I am not sure if i am approaching it wrong or there is something wrong in my code.
backpathbutton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String currentDBPath =
getDatabasePath(DATABASE_NAME).getAbsolutePath();
String backupDBPath = "my_db";
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
String rot = Environment.getExternalStorageDirectory().toString();
File currentDB = new File(currentDBPath);
File backupDB = new File(sd, backupDBPath);
if (currentDB.exists()) {
try {
db.close();
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
backupDB = new File(sd, backupDBPath+"-shm");
src = new FileInputStream(currentDB+"-shm").getChannel();
dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
backupDB = new File(sd, backupDBPath+"-wal");
src = new FileInputStream(currentDB+"-wal").getChannel();
dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();}
catch (IOException e) {
e.printStackTrace();
}}} });
Here is the restore button
restorebutton.setOnClickListener(v -> {
db.close();
String back=
getDatabasePath(DATABASE_NAME).getAbsolutePath();
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
String current = "my_db";
String currentsh = "my_db-shm";
String currentwl = "my_db-wal";
String filepath= sd+"/"+current;
String shmfile= sd+"/"+currentsh;
String currenwl= sd+"/"+currentwl;
File dest=new File(back);
Log.d(TAG, "Following files are in absolute path " + dest.list()); // returning null
try {
copyFile(filepath,dest);
copyFile(shmfile,dest);
copyFile(currenwl,dest);
Log.d(TAG, "Copied Sucessfully "); // it Copies without error
}
catch (IOException e) {
e.printStackTrace();
}
});
}
Here is my copy file function
public void copyFile(String src, File dst) throws IOException
{
FileChannel inChannel = new FileInputStream(String.valueOf(src)).getChannel();
FileChannel outChannel = new FileOutputStream(dst).getChannel();
try
{
inChannel.transferTo(0, inChannel.size(), outChannel);
}
finally
{
if (inChannel != null)
inChannel.close();
if (outChannel != null)
outChannel.close();
}
}
After returning back to my MainActivity, restored data is not showing, even after closing and reopening the app again.
I'm having trouble retrieving the .db file from DB card.
I used this code for backup database:
private void DBBackup() {
try {
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
if (sd.canWrite()) {
String currentDBPath = getContext().getDatabasePath(DBHelper.DB_NAME).getPath();
String backupDBPath = "DBBackupTest";
File currentDB = new File(data, currentDBPath);
File backupDB = new File(sd, backupDBPath);
if (currentDB.exists()) {
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
Toast.makeText(getContext(), "Export Successful!", Toast.LENGTH_SHORT).show();
}
}
} catch (Throwable e) {
e.printStackTrace();
}
}
after several minutes, I want to import the backed up database. This is the code for Import
try {
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
if (sd.canWrite()) {
String currentDBPath = "/storage/emulated/legacy/DBBackup";
String backupDBPath = "DBBackupTest"; // From SD directory.
File backupDB = new File(currentDBPath);
File currentDB = new File(sd, backupDBPath);
FileChannel src = new FileInputStream(backupDB).getChannel();
FileChannel dst = new FileOutputStream(currentDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
Toast.makeText(getContext(), "Import Successful!", Toast.LENGTH_SHORT).show();
}
} catch (Throwable e) {
Toast.makeText(getContext(), "Import Failed!", Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
The Toast show "Import Successful!" but when i check the database by using stetho. the database isn't attached. I need your help on this. thanks!
I fixed the problem by changing my currentDB and change it from:
File currentDB = new File(sd, backupDBPath);
to:
File currentDB = new File(getContext().getDatabasePath(DBHelper.DB_NAME).getPath());
I tried to retype see whether any typing error there but it still not working.
It does not even prompt me that I have any errors
I am thinking that is it my internal storage path file given wrongly?
This is where the internal storage file that i wanted to copy to!
This is how i called my method at onclick function:
else if (view == findViewById(R.id.btnBackup)){
exportDatabase("stock.db");
}
}
This is the method for exporting database:
public void exportDatabase(String databaseName) {
try {
File sd = getFilesDir();
File data = Environment.getDataDirectory();
if (sd.canWrite()) {
String currentDBPath = "//data//"+getPackageName()+"//databases//"+databaseName+"";
String backupDBPath = "//MyDb";
File currentDB = new File(data, currentDBPath);
File backupDB = new File(sd, backupDBPath);
if (currentDB.exists()) {
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
}
Toast.makeText(this, "Backup Done!", Toast.LENGTH_SHORT);
}
} catch (Exception e) {
Toast.makeText(this, "Fail!", Toast.LENGTH_SHORT);
}
}
Use this method work perfect.
public void exportDB(Context mContext) {
try {
File sd = mContext.getExternalFilesDir("/database/");
File data = Environment.getDataDirectory();
if (sd.canWrite()) {
String currentDBPath = "//data//" + PACKAGE_NAME + "//databases//" + DATABASE_NAME;
String backupDBPath = DATABASE_NAME;
File currentDB = new File(data, currentDBPath);
File backupDB = new File(sd, backupDBPath);
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
}
} catch (Exception e) {
}
}
I stored some data into SQLite database, and now i have to get those data from device's internal storage any how, i am using below code but nothing happening when doing tap on button
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
FileChannel source=null;
FileChannel destination=null;
String currentDBPath = "/data/data/app.church.sophie/databases/churchdb.db";
String backupDBPath = "SAMPLE_DB_NAME";
File currentDB = new File(data, currentDBPath);
File backupDB = new File(sd, backupDBPath);
try {
source = new FileInputStream(currentDB).getChannel();
destination = new FileOutputStream(backupDB).getChannel();
destination.transferFrom(source, 0, source.size());
source.close();
destination.close();
Toast.makeText(ExportDataActivity.this, "DB Exported!", Toast.LENGTH_LONG).show();
} catch(IOException e) {
e.printStackTrace();
}
}
I'm pretty new to android and I'm trying to export my DB to the SDCARD so I can import it into my other application.
Any suggestions?
Thanx in advance.
Export example:
public void exportDB(){
try {
File sd = Environment.getExternalStorageDirectory();
if (sd.canWrite()) {
String currentDBPath = "data/data/com.mypack.myapp/databases/mydb.db";
String backupDBPath = sd + "/filename.db";
File currentDB = new File(currentDBPath);
File backupDB = new File(backupDBPath);
if (currentDB.exists()) {
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
Import is very similar to export:
public void importDB(){
try {
File sd = Environment.getExternalStorageDirectory();
if (sd.canWrite()) {
String currentDBPath = sd + "/filename.db";
String backupDBPath = "data/data/com.mypack.myapp/databases/mydb_2.db";
File currentDB = new File(currentDBPath);
File backupDB = new File(backupDBPath);
if (currentDB.exists()) {
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
Although this might not be the best solution for what you are trying to do, your database is already stored in /data/data/your.package.name. You just need to load it as a file and save to SD card. Check here for the the code that does this:
http://www.screaming-penguin.com/node/7749