I want to only read data from the SQLite database. When I am creating database and reading it it is working but I have already a database created and I want to read data from this database.
I am pushing the database to the sdcard and trying to run the application but it is not reading form the database. I want to know that if install this .apk file in device then my database will also shift to the device or not.
Common practice is to store initial data on assets/raw folders of application resources. Then during 1st run just create DB using SQL scripts like:
create table if not exist
Fill DB with initial data - and here you're.
Related
I am creating Dictionary Android Application.This app create database of 235883 words that takes to much time to be inserted on database on first time app run.Is there any other solution to make it faster or install direct database file in root folders??
Yes u can create sqlite database file for your words and put it into assets folder and than you can access it at the time you launch your app.
I want to upload local sqlite database file at server but in sql format. Is it possible to directly save it in mysql supported format? The file is uploaded successfully on server but its just a flat file of sqlite db. When i open it in editplus or import it in phpmyadmin, it shows error. But when I manually export the database from sqlite manager in .sql extension, it successfully gets open in readable format in editplus. Please help me with this problem. Thanks in advance !
AFAIK you are talking about two completely different things.
Its like comparing a DB dump file to a properly exported file like an xml file with schema and data information from Oracle or MySql
When you export you get a file with or without .sql extension and it means a file with set of queries like DDL or DML create,insert etc. That may be sequentially run to execute all the commands in it and provide you with the right schema and data present in that file.
Whereas a DB file that is created via app is specific to the device and is an .sqlite file which is specific to sqlite browser and that may read it and not a set of queries only that you may open in edit-plus or a text editor.
Sqlite DB file that you find on your device is dynamically generated pages to maintain the integrity of the db.
For more info you must read,
Format of sqlite database
Sorry I don't have code but the idea is,
--Edit with algo--
Assuming you have the create commands for all tables and constraints with you , as they are not going to change most of the time.
You may use this function as a Utility to create and maintain the sql
command list for you parallel to the db you have.
void createExportCommands()
{
...
- Read all tables one by one using a `Cursor`
- Based on specific tables/columns create queries
i.e. String query="insert into "+your_table+" values("+cursor.getString(0),....+");";
- Write this data into a file called export_data.sql and keep updating it in background
}
Perhaps its not the best approach but it will solve your issue.
I'm new to programing for android and i'm still learning. So I have a question about the location of the SQLite database. Is it stored in the same file system as the application ?
And also i'm not sure can the database be created before the app is installed(can it come with the app) or can the database only be created from inside the app ?
And what if i wanted my app to come with a database that already has tables and records which is local and not on a server. Would that be possible ?
SQLite is available on every Android device. Using an SQLite database in Android does not require any database setup or administration.
You only have to define the SQL statements for creating and updating the database. Afterwards the database is automatically managed for you by the Android platform.
Access to an SQLite database involves accessing the filesystem. This can be slow. Therefore it is recommended to perform database operations asynchronously, for example inside the AsyncTask class.
If your application creates a database, this database is by default saved in the directory DATA/data/APP_NAME/databases/FILENAME.
The parts of the above directory are constructed based on the following rules. DATA is the path which the Environment.getDataDirectory() method returns. APP_NAME is your application name. FILENAME is the name you specify in your application code for the database.
You can also follow this tutorial for further understanding.
http://www.androidhive.info/2011/11/android-sqlite-database-tutorial/
Database is created after the app installation or after the db changes. The db is stored in /data/data/your_package/databases/
I have created a database android application it works correctly on emulator , but when Iam transferring it to my device it says that the table is not exist ,I have used 'openOrCreateDatabase() ' method , the database doesnt come with apk file ,when I run the ap, my database is read only, means I already have a lot of data in it and only need to see them
Things in your apk file such as assets are read only so you can't use it as a live database. If you have data already in sqlite database, you will have to copy the data into the live database. If on the other hand you have it in some other format such as csv, you will have to create a reader which will add it into your live database.
I've been working on testing trying to get an SQL database off of a website then take all the records and store them into arrays. Problem is that I've tried a ton of downloading methods and I keep getting hit with an error with opening the SQL database. I can't tell if this is actually downloading, if the database is corrupt (I checked it and it looked correct) or if my queries are messed up. Bear with me because I am just learning SQL and Android development.
The file at the link you provide is not a SQLite database. It's an ASCII file that contains SQL statements for creating a database and inserting content. There's no straightforward way to execute the content of that file in an Android app.
To make this work you need to create an actual SQLite database from your SQL file. To do that, install SQLite for whatever your desktop OS is and use this command:
sqlite> .read <filename of your SQL file>
Replace the file on your website with the SQLite file that creates. That should get you past the open error.
What are you doing here is download your database from url and stored it in sdcard.
Now you should open a empty database in your app and then copy your database in your app database and then try to open it.(you are not copying the database) the default location of database is
private String DB_PATH = "/data/data/your package name/databases/";