By Kevin Languedoc
This publication leads you thru the fundamental ideas and new iOS 10 SDK and fast three programming language APIs to construct iPhone and iPad database pushed functions utilizing the defacto general for facts garage for cellular apps, SQLite. Readers will find out about SQL operations like making a choice on, putting, updating and deleting info utilizing a variety of information kinds like textual content, numerical varieties, pictures or even audio/video facts. After operating via this ebook, you are going to achieve knowledgeable view of constructing iOS apps utilizing SQlite as a knowledge garage utilizing Objective-C and quick. With construct iOS Database Apps with speedy and SQLite additionally, you will achieve specialist wisdom on how one can create databases at runtime, together with growing or enhancing indexes, triggers, tables, columns, and perspectives. The examples use time-tested code from operating functions.
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Extra resources for Build iOS Database Apps with Swift and SQLite
The important line of code is the sqlite3_exec command. This command is really great, since it encapsulates sqlite3_prepare_v2, sqlite3_step, and sqlite3_finalize. I tend to use this command when I am doing inserts, updates, or deletes and opt to use the longer version for selects simply because I find I have more control to map the retuning columns to a custom data type. Using sqlite3_exec with a select query is possible; however, you need to provide a callback function in order for the third argument to handle the result set.
Add a View A view provides a listing based on a SELECT statement run against the contents of a table. The view may present all the data in a table or a subset of data depending on your needs. A view can provide better performance when accessing large datasets if you are limiting yourself to a subset of the entire table's contents. 19 CHAPTER 2 ■ CREATING SQLITE DATABASES The View menu in SQLite Manager provides several operations that you can perform on a view in addition to creating a view. For instance, you can opt to modify a view, drop a view, or rename a view.
Adding the Tables Recall the Create Table and Create View buttons in the UI? If you click on these, they will load the templates in the Db class into the detailSQLiteQueryField field to be edited. Once the queries are to your liking, you need only click on the Execute Query button (executeQueryButton) to execute the query through the database engine and create the database structure in the open database file. sqlite database and app, I will need two tables: wine and producer. I could easily extend this with a few more tables and views and triggers.