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Creation QR-Code in Objective-C > sqlite3 nav.db SQLite version 3.4.0

> sqlite3 nav.db SQLite version 3.4.0
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Enter ".help" for instructions sqlite> CREATE TABLE menu (catid int(5),parentid int(5),title varchar(32),entrytype varchar(12), ordering int(5)); sqlite> .import nav.data menu
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Note that to quit SQLite, you can either close the terminal or press Ctrl-Z on your keyboard. Afterward, you can add your now-complete database to Xcode using the normal procedures, a step that s not shown here. After you ve linked in your database the first time, you can go back and make changes to it, and the new version will always be used when you recompile your project. You now have a ready-to-run database, but you ll still need to prepare your Xcode to use SQLite. We ll look at that next.
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Accessing SQLite
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You have to link in some additional resources to use SQLite, as is typical for any major new functionality. First, you need to add the framework, which you can find under /usr/lib/libsqlite3.0.dylib, rather than in the standard framework directory. Second, you must add an import of sqlite3.h. You now have a database that s ready to use, and you ve included the functionality that you need to use it. The next step is to access SQLite s functions.
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SQLite includes approximately 100 functions, about 20 object types, and a huge list of
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constants. We ll cover the basics that you ll need to access the database you ve created. Table 9.2 shows the most critical API commands. They generally revolve around two important concepts: the database handle (which is returned by sqlite3_open and is used by everything else) and the prepared statement (which is returned by sqlite3_prepare and is used to run queries).
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Table 9.2 The most important SQLite API commands Function sqlite3_open Arguments filename, address of database database, SQL as UTF-8, max length to read, address of statement, address of unread results prepared statement Summary Opens a database.
sqlite3_prepare
Turns an SQL statement in UTF-8 format into a pointer to a prepared statement, which can be handed to other functions.
sqlite3_step
Processes a row of results from a prepared statement, or else returns an error.
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Using SQLite
Table 9.2 The most important SQLite API commands (continued) Function sqlite3_column_int Arguments prepared statement, column # Summary
Returns an int from the active row. Several other simple functions similarly return a specific column from the active row. Returns a char *, which is to say a string, from the active row. Several other simple functions similarly return a specific column from the active row. Deletes a prepared statement. Closes a database.
sqlite3_column_string
prepared statement, column #
sqlite3_finalize sqlite3_close
prepared statement database
These functions, in order, show the usual lifecycle of an SQLite database:
1 2 3 4 5
Open the database. Prepare statements, one at a time. Step through a statement, reading columns. Finalize the statement. Close the database.
SQLite includes two convenience functions, sqlite3_exec() and sqlite3_get_ table() that simplify these steps; but the functions are built using the core functionality just mentioned, so that s what we ve decided to highlight.
Building a navigation menu from a database
Now that you have a basic understanding of the SQLite functions, you can put together a prototype of a database-driven menu navigation system. What you ll do here is by no means complete, but it ll give you a great basis to build on. This example will also be one of the most complex in the book. It includes multiple classes of new objects designed to work either apart (in different programs) or together. In this section, we ll cover the SKDatabase class (which abstracts database connections), the SKMenu class (which abstracts navigator menu creation), and the DatabaseViewController (which transforms a typical table view controller into a databasedriven class). In the end, you ll hook everything together with the app delegate.
THE DATABASE CLASS
Because there aren t any preexisting object-oriented classes for the SQLite database functions, any program using a database should start by creating its own. Listing 9.1 contains the start of such a class, creating methods for the parts of the API that you ll need to create the database view controller.
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