Android SQLite delete table not actually deleting the rows

Question

Hi i am trying to delete all the rows in a table by below query

db.beginTransaction(); // db is a SQLiteDatabase object
int deleted = db.delete("user", null, null);
db.endTransaction();

I am getting n number of rows deleted in the table. But still rows exist in the table. Anything wrong in my delete call?

Answer 1

You need to call setTransactionSuccessful to commit all the changes done to the database, before calling endTransaction :

db.beginTransaction();
int deleted = db.delete("user", null, null);
db.setTransactionSuccessful();
db.endTransaction();

Source (Android developer reference):

The changes will be rolled back if any transaction is ended without being marked as clean (by calling setTransactionSuccessful). Otherwise they will be committed.

Answer 2

Just try this

public int delete(String tableName) {
    SQLiteDatabase db = this.getWritableDatabase();
    int x = db.delete(tableName, null, null);
    db.close();
    return x;
}

Answer 3

Try it :

db.execSQL("DROP TABLE IF EXISTS table_name");

Where db is a reference to a SqliteDatabase object.

Answer 4

When we install the app the database file is recreated in the /data folder. The problem may occour due to recreation of database even after deleting the files.

Check if this is the case.

Answer 5

String query="delete from "+tablename;

SQLiteDatabase db=getWritableDatabase();

db.execSQL(query);

Log.d("msg","deleted");