database intro w/sqlite · 2013-03-01 · database intro w/sqlite how to put an embedded database...

Database Intro w/SQLite

How to put an embedded database on your phone and integrate with your application.

deano@webenefitall.comThursday, February 28, 13

Things you will need:

SQLite software to create the database comes standard on intel macs

free needs to be downloaded for windows

SQLite browser/editor software

used to create/edit databases and tables

free, just needs to be downloaded and set up

Create a simple database(s) and table(s)

Create Android Database sample application

Put database into Android project

Test app (fingers crossed, hope all goes well) :)

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Download & Setup SQLite software

For Mac

It is include in Mac OS X.

It is located in /usr/bin directory and called sqlite3

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Download & Setup SQLite software

For Windows

Download Precompiled Windows Binaries from the SQLite webpage.

http://www.sqlite.org/download.html

Extract the binaries by double clicking on the downloaded zip files. You can extract the files to your C drive (folder name C:\sqlite\ ) or to any location which suits your needs.

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Download & Setup SQLite Browser (same software for Win/Mac)

Download zip file from

http://sourceforge.net/projects/sqlitebrowser/

Click on the Download icon

Extract this to some location on your PC/Mac

Double click on SQLite Database Browser application to run SQLite DB Browser

Win & Mac Screen shots on next page

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Create Database and Table

File > New Database

Enter name hit Save (put

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Create Table(s)

Edit > Create Table

enter Table name

Hit ADD to add fields to table

When all fields are added hit Create

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MUST HAVE...

Every Android database must have a table called android_metadata with one field called locale of type TEXT as seen below

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How to do this...Create table android_metadata in your database

Add field called locale of type TEXT

Set the default value of en_US into the locale field in the android_metadata table

See screenshot on next page...

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Enter this SQL string

Hit the Execute query button

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SQLITE Demo...create database using (sqlite browser)

I like to put a .db extension on file

create table

add column

note limited column types

be creative

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Linking TablesKeys are supported, but difficult to enable...

http://www.sqlite.org/foreignkeys.html#fk_enable

For most apps not needed. Just use common field names between tables. “Poor mans linking”

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Managing Dates

SQLite does not have a date/time field type

SQLite does have date time funtions, but stores its values in TEXT fields

YYYYMMDDHHmmSS

HHmmSS is optional

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How to put DB in AppDrag .db file into the assets directory in your project.

Create and run your Sample App

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Where did it go..DP_PATH = /data/data/[PACKAGE]/databases/

DB_NAME = name you gave your DB

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How can you get DB from App

Window > Show View > Other... > Android > File Explorer

Navigate to /data/data/[packageName]/databases

Then use the icon to copy db to computer

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Add Class to DB...Enter a Class Name

Enter a Class Number

Click Submit to insertdata into database

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Code Segments...!I will make the sample project available on MeetUp (somehow)

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Sample Application

Grade Book Application

Paper Prototype

Here is an example of a SQLite database with some tables and fields

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Questions...

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