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object-relational mapping (ORM). Core Data provides a Cocoa-based ORM solution for Mac OS X. However, no ORM libraries or tools ship with the iPhone. As a result, it is incumbent on us, the programmers, to devise our own approach to mapping information from the database to our objects and back again. In this chapter, we re going to focus on the basics, including setting up SQLite3, creating a table to hold your data, and saving data to and retrieving values from the database. Obviously, in the real world, such a simple application wouldn t warrant the investment in SQLite3. But its simplicity is exactly what makes it a good learning example. If you re completely new to SQL, you might want to find out more about SQLite3 and the SQL language before continuing on with this chapter. A couple of good starting points are the Introduction to the SQLite3 C API at http://www.sqlite.org/cintro.html and the SQLite SQL Language Guide at http://www.sqlite.org/lang.html.

Note Please ignore the fact that it looks like I m talking to myself in this thread. In a real scenario, these posts would be entered by different users.

Before you can use SQLite3, you have to open the database. The command that s used to do that, sqlite3_open(), will open an existing database, or if none exists at the specified location, it will create a new one. Here s what the code to open a new database might look like:

sqlite3 *database; int result = sqlite3_open("/path/to/database/file", &database);

From the List ribbon, switch to threaded view, as shown in Figure 5-11.

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Figure 2-2. Topology Entry Form for the final site An alternate strategy you may consider is to group your clients logically by service rather than by physical location. You still need to enter network link information, but the result will be an alternative logical SMS site configuration that may better serve your unique needs. After entering the values, you can go back and alter these values in the Capacity Planner to perform some what-if or growth scenarios.

If result is equal to the constant SQLITE_OK, then the database was successfully opened. One thing you should note here is that the path to the database file has to be passed in as a C string, not as an NSString. SQLite3 was written in portable C, not Objective-C, and it has no idea what an NSString is. Fortunately, there is an NSString method that generates a C-string from an NSString instance:

char * cStringPath = [pathString UTF8String];

Figure 5-11. Switching the discussion view The same discussion in threaded view is shown in Figure 5-12.

When you re all done with an SQLite3 database, you close the database by calling:

When I perform the topology step, I tend to do it in two phases: first to represent the existing WAN/LAN configuration and client numbers, then a second time in another sheet to represent aggressive growth for three years in the future. This gives me a better idea of what the existing capacity is and allows me to project growth.

sqlite3_close(database);

Figure 5-12. Displaying the discussion in threaded view Apart from the fact that the user s picture is not shown, you should also note the indentation, which helps to show the message threads. Notice that the third and fourth posts are indented the same amount. That is because both of these were replies to the second post. If you click the Show Quoted

Databases store all their data in tables. You can create a new table by crafting an SQL CREATE statement and passing it in to an open database using the function sqlite3_exec, like so:

char * errorMsg; const char *createSQL = "CREATE TABLE IF NOT EXISTS PEOPLE (ID INTEGER PRIMARY KEY AUTOINCREMENT, FIELD_DATA TEXT)"; int result = sqlite3_exec (database, createSQL, NULL, NULL, &errorMsg;);

The Topology Entry Form has several fields. Some of the field labels are somewhat cryptic at first glance. Here s a brief description of each field: Location Ref: An internally generated value that is used to keep track of your topology configuration. Don t change this value. Parent Location Ref: Like the Location Ref field, an internally generated value that you shouldn t change. Location name: A name for the physical or logical location you are defining. You can use any naming convention that makes sense in your environment. Number of Locations like this: If you have multiple locations in this tier that match this configuration, enter the number of them here. If there is only one location like this in the current tier, enter 1.

Messages link, the full message chain is displayed so you can see exactly which message chain this reply was made to.

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