I think that this is rather easy question. I am too young in android stuff already. I want to prepare application which will be using database. In every example I've shown, there is an empty database where application is firstly started and after that there are some inserts. I want to have app with rather big db so I want to have filled db when app is started. How can I prepare db and attach it to program?
put your filled database in Package's Asset directory,
at application runtime just copy that database to application's internal storage like
data/data/<package name>/database directory.
then use it.
EDIT: this for copy database from asset directory to database directory,
private void copyDataBase() throws IOException {
try {
// Open your local db as the input stream
InputStream myInput = myContext.getAssets().open("your Database file name");
// Path to the just created empty db
String outFileName = "/data/data/<package name>/databases/";
OutputStream myOutput = new FileOutputStream(outFileName);
// transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
// Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
} catch (Exception e) {
Log.e("error", e.toString());
}
}
Related
We have an android app that uses SQLite for some form of persistent storage. The sqlite code works on all devices except Oneplus devices. ( I am testing on Oneplus 2 A2003)
Following is the error that I am seeing in logcat.
android.database.sqlite.SQLiteException: no such table: testtable
(code 1): , while compiling: INSERT INTO
testtable(ID,CompletedOn,CreatedOn,Type,Pending,Priority,Attributes)
VALUES (?,?,?,?,?,?,?)
Following is the piece of database that is used for open database
SQLiteDatabase db = SQLiteDatabase.openDatabase(this.getHelperContext().getDatabasePath(DATABASE_NAME).getAbsolutePath(), null,
SQLiteDatabase.NO_LOCALIZED_COLLATORS);
Have tried even specifying the access rights while opening, but no difference.
e.g. SQLiteDatabase.NO_LOCALIZED_COLLATORS | SQLiteDatabase.OPEN_READWRITE
Any help would be appreciated.
Check this answer https://stackoverflow.com/a/33032467/4504324 it solved the issue for me.
Just close the db before copying the sqlite stream into internal database.
private void copyDataBase() throws IOException {
try {
//Open your local db as the input stream
InputStream myInput = mContext.getAssets().open("databases/" + DB_NAME+".sqlite");
// Path to the just created empty db
String outFileName = mContext.getDatabasePath(DB_NAME).getAbsolutePath();
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//close the database so that stream can be copied
this.getReadableDatabase().close();
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
} catch (Exception e) {
e.printStackTrace();
}
}
I need a local database for my application.I created one and i encrypted it.(I know the pw).Now i want to load this db to my original application's assets folder.I want to decrypt it before copy.
I had a copy code like this this is working for unencrpyted db.
How can I translate this for my encrypted db.Thanks
private void copyDataBase() throws IOException {
//Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[5120];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
The proper way to do this would be to copy the encrypted database into a local folder. Then you can open it with SQLCipher and use sqlcipher_export() to convert it into a standard (non-encrypted) SQLite database.
I have copied database in Android Project folder and It is working fine. Now, I am inserting values in table. So I want to know that Is there anyway by which I can see those data using SqlLite Database Browser ???
Database in assets folder, I opened it but I can't see any new data.
My Code to insert data:, It is working fine, no errors.
public boolean SaveUserResponse(String QId, String OptionId,
String ResponseDate) {
try {
ContentValues cv = new ContentValues();
cv.put("QId", QId);
cv.put("OptionId", OptionId);
cv.put("ResponseDate", ResponseDate);
mDb.insert("tblUserResponse", null, cv);
Log.d("SaveUserResponse", "User Response has been Saved.");
return true;
} catch (Exception ex) {
Log.d("SaveUserResponse", ex.toString());
return false;
}
You can fetch your DB from device using DDMS (can be found under android-sdk\tools). There open Device -> File Explorer. Then navigate to data\data\your_app and pull your DB to a disk.
BTW, your DB shouldn't be placed under assets, here is a code how to copy it from assets (you can call it on the first run of your app):
void copyDataBase() throws IOException {
String DB_PATH = "/data/data/<app>/databases/";
String DB_NAME = "db.sqlite";
//Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
How to use an existing database with an Android application
how to put .db file from assets to data/data/packagename/ without using copying content of .db file in assets. I don't want to create database because its useless to put the .db file in assets. I explore on it but all are again creating databse but i only want to put that .db file directly.
use this
private void copyDataBase() throws IOException {
// Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = "/data/data/"
+getApplicationContext().getPackageName()
+ "/databases/" + DB_NAME;
// Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
// transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
// Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
Is it possible to supply prefilled SQLite DB to my app? I want to use db as ordinary SQLite db which will have tables filled manually and I want to include it into my .apk file.
Yes, include it in your assets folder and copy it into the /databases folder when your application first launches.
try this
private void copyDataBase() throws IOException{
//Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
Including in the assets folder is one option (Apk size will be increased.)
How about storing the pre-filled db on any cloud storage service provider and downloading the file on the first run of the app?