I'm trying to understand how the connectivity works. I'm required to have a database in the assets folder(which I already built).
I got an entire class adapter, was told to implement it in my code and start using it, but I'm not sure how to 'import' it.
My main class is 'MainActivity', I tried DBAdapter adapter = new DBAdapter();
but that didn't work.
Here's the adapter class:
package com.example.movieass;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DBAdapter {
public static final String KEY_ID = "m_id";
public static final String KEY_TITLE = "m_title";
public static final String KEY_DESCRIPTION = "m_description";
public static final String KEY_RATING = "m_rating";
private static final String TAG = "DBAdapter";
private static final String DATABASE_NAME = "database";
private static final String DATABASE_TABLE = "films";
private static final int DATABASE_VERSION = 2;
private static final String DATABASE_CREATE =
"CREATE TABLE trailer (m_id INTEGER PRIMARY KEY AUTOINCREMENT, " +
"m_title TEXT NOT NULL, m_description TEXT NOT NULL, m_rating REAL NOT NULL);";
private final Context context;
private DatabaseHelper DBHelper;
private SQLiteDatabase db;
public DBAdapter(Context ctx)
{
this.context = ctx;
DBHelper = new DatabaseHelper(context);
}
private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
try {
db.execSQL("DROP TABLE IF EXISTS trailer");
db.execSQL(DATABASE_CREATE);
} catch (SQLException e) {
e.printStackTrace();
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS trailer");
onCreate(db);
}
} //end DatabaseHelper class
//---opens the database---
public DBAdapter open() throws SQLException
{
db = DBHelper.getWritableDatabase();
return this;
}
//---closes the database---
public void close()
{
DBHelper.close();
}
//---insert a contact into the database---
public long insertTrailer(String title, String description, String filename, double rating)
{
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_TITLE, title);
initialValues.put(KEY_DESCRIPTION, description);
initialValues.put(KEY_RATING, rating);
return db.insert(DATABASE_TABLE, null, initialValues);
}
//---deletes a particular contact---
public boolean deleteTrailer(long rowId)
{
return db.delete(DATABASE_TABLE, KEY_ID + "=" + rowId, null) > 0;
}
//---retrieves all the contacts---
public Cursor getAllTrailers()
{
return db.query(DATABASE_TABLE, new String[] {KEY_ID, KEY_TITLE,
KEY_DESCRIPTION, KEY_RATING}, null, null, null, null, null);
}
//---retrieves a particular contact---
public Cursor getTrailer(long rowId) throws SQLException
{
Cursor mCursor =
db.query(true, DATABASE_TABLE, new String[] {KEY_ID,
KEY_TITLE, KEY_DESCRIPTION, KEY_RATING}, KEY_ID + "=" + rowId, null,
null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
do{
Log.d("DBAdapter", "ID: " + mCursor.getString(mCursor.getColumnIndex("ID")));
}while (mCursor.moveToNext());
}
return mCursor;
}
//---updates a contact---
public boolean updateTrailer(long rowId, String title, String description, String filename, double rating)
{
ContentValues args = new ContentValues();
args.put(KEY_TITLE, title);
args.put(KEY_DESCRIPTION, description);
args.put(KEY_RATING, rating);
return db.update(DATABASE_TABLE, args, KEY_ID + "=" + rowId, null) > 0;
}
public boolean updateRating(long rowId, double rating)
{
ContentValues args = new ContentValues();
args.put(KEY_RATING, rating);
return db.update(DATABASE_TABLE, args, KEY_ID + "=" + rowId, null) > 0;
}
}
This is my working code to copy database.
private static String DB_PATH = "/data/data/com.demo.databaseDemo/databases/";
private static String DB_NAME = "myDatabase.db";
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();
}//end of copyDataBase() method
Also You can refer this for more details http://mobisys.in/blog/2012/01/tutorial-using-database-in-android-applications/
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