By Jason Wei
Make the most the ability of data-centric and data-driven Android functions with this useful instructional grasp the talents to construct data-centric Android purposes transcend simply code by means of tough your self to contemplate sensible use-cases with SQLite and others concentrate on flushing out excessive point layout innovations, prior to 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 capsule units and the surge well known for the Android platform. besides the call for for extra information, there's a call for for effective, "snappy" purposes, and so builders have to have a powerful knowing of whilst diverse information garage equipment are applicable and after they aren't. learning tips to use those fields to effectively create a strong software might help you enhance your wisdom and talents during this zone. "Android Database Programming" is designed to assist builders create and layout data-centric cellular functions on Google's Android platform. because the international is going more and more cellular and as consumers' call for for data-centric purposes rises, realizing the best way to mix the 2 successfully turns into an more and more very important asset to have as a developer. The booklet starts off by means of taking a look at a number of the neighborhood info garage equipment on Android, and finishes off by means of studying exterior databases and methods you could make the most of them from inside an Android program. This ebook begins through neighborhood information garage equipment, targeting writing SQLite databases in your program and likewise how you can bind those databases to the consumer interface. The booklet, via its sensible procedure, strives to educate you through examples. each one bankruptcy specializes in flushing out excessive point layout thoughts, prior to drilling down into diversified code examples.
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At this point, for those who are well versed in SQL programming and database schemas, you might be wondering if it's possible to add triggers and key constraints to your SQLite database schemas. " In any case, to spend any time on writing and implementing triggers would be deviating too much from the core content of this book, and so I chose to omit that discussion (though these could certainly be helpful even in our simple example). Now that we have our schema created, before moving on to designing all kinds of complex queries for pulling different groups of data (this we'll see in the next chapter), it's time to write some wrapper methods.
TABLE_NAME); // CREATE NEW INSTANCE OF SCHEMA onCreate(db); } } [ 29 ] Using a SQLite Database So here we see that in our onCreate() method we execute SQL commands to create all three tables, and furthermore, in the onUpgrade() method we execute SQL commands that drop all three tables and subsequently recreate all three tables. Of course, since we are overriding the SQLiteOpenHelper class, in theory we can customize the behavior of these methods in any way we want (for instance, some developer's might not want to drop the entire schema in the onUpgrade() method), but for now let's keep the functionality simple.
This can explicitly be seen with the constructed query returned by our SQLiteQueryBuilder class in the third method: [ 50 ] Chapter 3 Just like with any programming language, you can filter logic through the use of AND/OR operators; the same applies to SQL and, specifically, with SQL WHERE filters. Instead of asking for all rows which satisfy one set of conditions, you can write queries which would return rows that satisfy all given conditions, or more loosely, just one of several given conditions.