By Jason Wei
Take advantage of the ability of data-centric and data-driven Android purposes with this functional educational grasp the talents to construct data-centric Android purposes transcend simply code through tough your self to contemplate sensible use-cases with SQLite and others specialize in flushing out excessive point layout recommendations, sooner than drilling down into diversified code examples intimately we are living in an more and more data-centric and data-driven international. On most sensible of that we are living in a truly mobile-centric international with the increase of Android shrewdpermanent telephones and pill units and the surge admired for the Android platform. in addition to the call for for extra info, there's a call for for effective, "snappy" functions, and so builders must have a robust figuring out of while diverse information garage tools are acceptable and after they usually are not. gaining knowledge of find out how to use those fields to effectively create a robust program may also help you develop your wisdom and talents during this zone. "Android Database Programming" is designed to aid builders create and layout data-centric cellular purposes on Google's Android platform. because the international is going more and more cellular and as consumers' call for for data-centric functions rises, realizing easy methods to mix the 2 successfully becomes an more and more vital asset to have as a developer. The publication starts off by way of many of the neighborhood information garage equipment on Android, and finishes off by way of interpreting exterior databases and methods you could make the most of them from inside an Android program. This publication starts off by way of taking a look at neighborhood information garage tools, concentrating on writing SQLite databases in your software and in addition how one can bind those databases to the person interface. The booklet, via its useful strategy, strives to coach you by way of examples. every one bankruptcy specializes in flushing out excessive point layout techniques, sooner than drilling down into assorted code examples.
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Extra info for Android Database Programming
In the first method, the external file directory root that is returned is specific to your application, so that when your application is uninstalled all of those associated files are deleted from the external SD card as well. In the second method, the file directory root that is returned is a public one, so that files stored on these paths will remain persistent even when your application is uninstalled. Deciding which to use simply depends on the kind of file you are trying to save — for instance, if it's a media file that gets played in your application, then the user probably has no use for it if he/she decides to uninstall your application.
Then, we actually implemented an Activity class to show off our new database schema and ran through some sample database commands to test their functionality. Though we were able to validate and output the results of all our commands, we realized that this was a pretty verbose and suboptimal way for debugging our sqlite3 database, and so we looked into the Android Debug Bridge (adb) tool. With the adb tool, we were able to open a command-line terminal that then hooked into a running instance of an emulator or Android device, and subsequently, connect to that emulator/device's sqlite3 database.
Println("STUDENT " + sid + " OF GRADE 11 IS ENROLLED IN COURSE " + cid2); } } } So first we add some dummy data into our schema; in my case, I will add five students and three courses, and then enroll those students into some classes. Once the schema has some data in it, I will try out some methods and first request all the students signed up for CS106A. Afterwards, I will test another wrapper method we wrote and request all the students signed up for CS106A, but this time only those students in grade 11.