Android Database Programming by Jason Wei

By Jason Wei

Take advantage of the ability of data-centric and data-driven Android purposes with this functional educational grasp the abilities to construct data-centric Android functions transcend simply code by means of demanding your self to contemplate sensible use-cases with SQLite and others specialize in flushing out excessive point layout techniques, prior to drilling down into diverse 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 really mobile-centric international with the increase of Android shrewdpermanent telephones and capsule units and the surge favourite for the Android platform. besides the call for for extra information, there's a call for for effective, "snappy" purposes, and so builders must have a powerful knowing of while varied info garage equipment are acceptable and after they should not. studying tips to use those fields to effectively create a robust program can help you strengthen your wisdom and talents during this region. "Android Database Programming" is designed to assist builders create and layout data-centric cellular purposes on Google's Android platform. because the global is going more and more cellular and as consumers' call for for data-centric purposes rises, figuring out the best way to mix the 2 successfully turns into an more and more very important asset to have as a developer. The e-book starts off by means of taking a look at some of the neighborhood information garage equipment on Android, and finishes off via analyzing exterior databases and methods you could make the most of them from inside an Android software. This publication begins by means of taking a look at neighborhood info garage tools, targeting writing SQLite databases in your software and in addition how you can bind those databases to the person interface. The booklet, via its sensible procedure, strives to educate you through examples. each one bankruptcy makes a speciality of flushing out excessive point layout suggestions, prior to drilling down into diversified code examples.

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The LIMIT clause takes on two formats: • LIMIT n, m • LIMIT n The first format tells the query to return just m rows (that is, limiting how many rows to return) starting from row n. The second format simply tells the query to return the first n rows which satisfy the given conditions. The first format definitely provides us with more flexibility, but, unfortunately, neither the second nor the third method allows us to take advantage of this format (due to the way that it automatically constructs the query for us), while the first format (the raw SQL query) can execute any valid SQL query.

And so the output from running this Activity is as follows: And voila! We quickly see that Students 1, 2, 3, and 5 were all enrolled in CS106A. However, after filtering by grade 11, we see that Student 3 is the only one signed up for CS106A in grade 11 – poor George. println("STUDENT " + sid1 + " IS ENROLLED IN COURSE " + cid); } } } This time around, we first ask for all the classes that Student 1 (myself) is enrolled in. But oh no! Something happened to Math51 this quarter and so it was cancelled!

However, we'll see in the next chapter that by mastering more advanced SQL query concepts, we can enjoy both a substantial performance boost as well as a substantial memory boost in our application! [ 42 ] SQLite Queries In the last chapter, we kicked our database building up a notch – transforming a simple schema involving just one, lone table, into a complex schema involving three interdependent tables. And now that we have a solid foundation in developing custom SQLite databases for Android, it's time to put the icing on the cake.

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