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This isn t an error! If a column is an identity column or has a default value, then you don t need to specify it when you re adding a new row; the database takes care of populating the column So, even though you haven t specified the PlayerID column, the value is entered automatically by the database It s also possible to insert data into a database using the INSERT query without specifying the columns you want to insert the data into, as long as you specify the data for all the columns (bar the identity columns) in the order they appear in the database Even columns that have default values must be specified So, you could change the previous INSERT query to the following without any problems: INSERT Player VALUES ('New Player', 1, '199.

As noted in the previous section, if you specify the target component in your intent, Android has no doubt where the intent is supposed to be routed to, and it will launch the named activity. This might be appropriate if the target intent is in your application. It definitely is not recommended for sending intents to other applications. Component names, by and large, are considered private to the application and are subject to change. Content Uri templates and MIME types are the preferred ways of identifying services you wish third-party code to supply. If you do not specify the target component, Android must figure out which activities (or other intent receivers) are eligible to receive the intent. Note the use of the plural

99', 'Solid State') Although inserting data without specifying a list of columns is perfectly valid, it makes more sense to name the columns As with the SELECT query, specifying the columns makes the query slightly quicker and shows which columns you re trying to affect With the INSERT query, it also avoids putting data in the wrong column if columns have been added to or removed from the table..

#include <stdio.h> int main (int argc, char *argv[]) { printf ("hello world\n"); return 0; }

activities, as a broadly written intent might well resolve to several activities. That is the...ummm...intent (pardon the pun), as you will see later in this chapter. This routing approach is referred to as implicit routing. Basically, there are three rules, all of which must be true for a given activity to be eligible for a given intent: The activity must support the specified action. The activity must support the stated MIME type (if supplied). The activity must support all of the categories named in the intent. The upshot is that you want to make your intents specific enough to find the correct receiver(s), and no more specific than that. This will become clearer as we work through some examples later in this chapter.

Note One point to remember about INSERT is that it works with only a single table at a time. If you re

working with complex data that would be sourced from two or more tables in a database, you ll need to write an INSERT query for each table to be updated. For example, to add details for a new Player to the sample database, you would have to write an INSERT query for both the Player table and the WhatPlaysWhatFormat table at the least. If the new Player were manufactured by a Manufacturer not in the database, you would need to create an INSERT query for the Manufacturer table as well.

Stating Your Intent(ions)

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The database-generation scripts in the code download for this book illustrate this point. The scripts contain INSERT queries for each row in each table, with each table populated in the correct order so that no data entry breaks any of the database constraints.

All Android components that wish to be notified via intents must declare intent filters, so Android knows which intents should go to that component. To do this, you need to add intent-filter elements to your AndroidManifest.xml file. All of the example projects have intent filters defined, courtesy of the Android application-building script (activityCreator or the IDE equivalent). They look something like this:

/* $URL$ * $Rev$ * $Author$ * $Date$ * $Id$ */ #include <stdio.h> int main (int argc, char *argv[]) { printf ("hello world\n"); return 0; }