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clause. In the previous filtering examples, you ve looked at comparing only two values to see if they re equal. Now, let s look at the other operators that are available.

< xml version="1.0" encoding="utf-8" > <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <Button android:id="@+id/flip_me" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Flip Me!" /> <ViewFlipper android:id="@+id/details" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:textStyle="bold" android:textColor="#FF00FF00" android:text="This is the first panel"

The verify command verifies the integrity of the data stored in each revision of the repository and prints an error if any inconsistencies are found: $ svnadmin verify REPOS

Table 3-3 describes the standard comparison operators. You should be familiar with most of the comparison operators; they work in the way that you would expect.

/> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:textStyle="bold" android:textColor="#FFFF0000" android:text="This is the second panel" /> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:textStyle="bold" android:textColor="#FFFFFF00" android:text="This is the third panel" /> </ViewFlipper> </LinearLayout>

svnlook allows you to retrieve information about the contents of a repository revision or transaction. In addition to the other arguments mentioned, all of svnlook s subcommands (other than help) take as their first argument the path to the repository s location on disk.

Equality Inequality Less than Greater than Less than or equal to Greater than or equal to Test for null values

PlayerManufacturerID = 1 PlayerManufacturerID <> 1 PlayerManufacturerID < 3 PlayerManufacturerID > 4 PlayerManufacturerID <= 3 PlayerManufacturerID >= 4 PlayerManufacturerID IS NULL

Notice that the layout defines three child views for the ViewFlipper, each a TextView with a simple message. Of course, you could have very complicated child views, if you so chose.

The author command prints out the author of the revision or transaction in question: $ svnlook author REPOS Table A-46 shows the author command s options. Table A-46. author Options

The only comparison operator that you may not be unfamiliar with is the IS NULL operator. Null values in the database can t be compared to any other value and won t appear in any comparison. So, if you execute the following query, you would expect to return every Player that had a PlayerManufacturerID of any value other than 1: SELECT PlayerName FROM Player WHERE PlayerManufacturerID <> 1 However, this isn t the case, and if null values are allowed for PlayerManufacturerID, you would need to test for this condition explicitly, like so: SELECT PlayerName FROM Player WHERE PlayerManufacturerID <> 1 OR PlayerManufacturerID IS NULL This will return the correct results: Players that have a PlayerManufacturerID that isn t equal to 1 and Players that have a null value for PlayerManufacturerID.

To manually flip the views, we need to hook into the Button and flip them ourselves when the button is clicked:

You ve already seen the OR logical operator in action when you filtered the results in the previous example, and I sneaked it in again at the end of the discussion of comparison operators. Table 3-4 lists all of the SQL logical operators.

--revision [argument] --transaction [argument]

Returns true if both conditions are true Returns true if either condition is true Returns true if the condition is false

public class FlipperDemo extends Activity { ViewFlipper flipper; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); flipper=(ViewFlipper)findViewById(R.id.details); Button btn=(Button)findViewById(R.id.flip_me); btn.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { flipper.showNext(); } }); } }

The cat command prints out the contents of a specified file within a revision or transaction: $ svnlook cat REPOS FILE

SQL also defines two other handy operators that you can use within the WHERE clause to make some of the clauses that you need to execute a little simpler. The IN operator allows you to specify that you re looking within a series of noncontiguous values and is equivalent to using the OR operator to chain together several different equality comparisons. For example, to return all the Players that have a PlayerManufacturerID of 1, 3, or 5, you could execute the following query: SELECT PlayerName, PlayerManufacturerID FROM Player WHERE PlayerManufacturerID = 1 OR PlayerManufacturerID = 3 OR PlayerManufacturerID = 5 The IN operator allows you to do this more simply: SELECT PlayerName, PlayerManufacturerID FROM Player WHERE PlayerManufacturerID IN (1,3,5) Both queries will return the same results, as shown in Figure 3-29.