如何用特定行更新SQQLite数据库？

Question

while updating in database, I'm not getting the id of particular row
here is my code for update Note in database

public int updateNote(int id, String tittle, String content , String update_at)
    {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(Note.COLUMN_TITTLE,tittle);
        values.put(Note.COLUMN_CONTENT,content);
        values.put(Note.COLUMN_TITTLE,update_at);
        return db.update(Note.TABLE_NAME,values,Note.COLUMN_ID+"="+id,null);

    }

Please help me.

Answer 1

update returns the number of rows affected and not the id of the row.
In your case if successful it would return 1.
About the id you need you already have it.

Answer 2

As mTak outlined, the update method returns the number of rows affected. You can also see that in the documentation .

If you want your method to return the ID of the row you updated, then return the id that you pass in, since that's how you select the row to update in the first place:

public int updateNote(int id, String tittle, String content , String update_at) {
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(Note.COLUMN_TITTLE,tittle);
    values.put(Note.COLUMN_CONTENT,content);
    values.put(Note.COLUMN_TITTLE,update_at);
    db.update(Note.TABLE_NAME,values,Note.COLUMN_ID+"="+id,null);

    return id;
}

Answer 3

In your Activity Class:

 //*Note is your setterClass  
 //*notesList is your ArrayList or list
 //*position refers your current list position
 //*setNote is a method in Note Class

 private void updateNote(String note, int position) {
        Note n = notesList.get(position);
        // updating note text
        n.setNote(note);

        // updating note in db
        db.updateNote(n);

        // refreshing the list
        notesList.set(position, n);
        mAdapter.notifyItemChanged(position);
    }

In your database class try below code:

 public int updateNote(Note note) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(Note.COLUMN_NOTE, note.getNote());

        // updating row
        return db.update(Note.TABLE_NAME, values, Note.COLUMN_ID + " = ?",
                new String[]{String.valueOf(note.getId())});
    }

here i am trying to update single string.i hope this is workig to you.Let me know is this working or not.