Error attempt to write a readonly database sqlite 3 commands

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Error attempt to write a readonly database sqlite 3 commands

SQLite is one way of storing app data. It is very lightweight database that comes with Android OS. In Android, integrating SQLite is a tedious task as it needs writing lot of boilerplate code to store simple data.

Consider SQLite when your app needs to store simple data objects. In this article we are going to learn basics of SQLite database with a realtime example of Notes App. The app will be very minimal and will have only one screen to manage the notes.

Below are the screenshots of the app. Creating New Project 1. The RecyclerView will be used to display the Notes in list manner. Add the below resources to colors. Below is the final project structure and files we gonna need. We also need a model class to create Note objects to manage the notes easily.

Under database package, create a class named DatabaseHelper. This class holds the database related methods to perform the CRUD operations. In this method, we execute the create table sql statements to create necessary tables.

You have to take care of database migrations here without loosing the older data if necessary. For now, we just drop the older tables and recreate them again.

Add the following methods to same class. Inserting Note Inserting data requires getting writable instance getReadableDatabase on database. Below, we are inserting new note in database.

Android SQLite Database Tutorial

ContentValues is used to define the column name and its data to be stored. Every time the database connection has to be closed once you are done with database access.

Reading Notes Reading data requires only read access getReadableDatabase on the database. Updating Note Updating data again requires writable access. Deleting Note Deleting data also requires writable access. Under utils package, create two classes named RecyclerTouchListener.

MyDividerItemDecoration class adds divider line between rows. Adding Notes UI Now we have the database helper class ready.

First we need an adapter to display the notes in list manner.

error attempt to write a readonly database sqlite 3 commands

For this, we need a layout file and Adapter class. This layout holds the design of single note item in the list. Under view package, create a class named NotesAdapter. This adapter class renders the RecyclerView with defined layout and data set.

Getting started

Note; public class NotesAdapter extends RecyclerView. So, we need to create a custom layout with EditText input and inflate it in AlertDialog. I am also changing the icon of FAB here.

This dialog will be shown by tapping FAB. This dialog can be invoked by long pressing the note in the list. Selecting Edit, opens the update note dialog with already existed note text.

You can modify the note text and update it in database by calling updateNote method. The deleted note is again removed from list by calling notifyItemRemoved on adapter.The interface to the SQLite library consists of single tcl command named sqlite3 Because there is only this one command, the interface is not placed in a separate namespace.

If true, then a new database is created if one does not already exist. If false, then an attempt to open a database file that. Overview. You can use Free Pascal/Lazarus to access a MySQL database server. Also you can use MySQL Data access components (MyDAC) as a Lazarus component to connect Lazarus and MySQL.

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The Tcl interface to the SQLite library