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If you compile now, you will see two warnings appear. The first warning is in the init method, as shown in Figure 5-5.

public abstract class GenericEJB3DAO<T,ID extends Serializable> implements GenericDAO<T, ID> { private Class<T> entityBeanType; private EntityManager em; public GenericEJB3DAO() { this.entityBeanType = (Class<T>) ( (ParameterizedType) getClass().getGenericSuperclass() ) .getActualTypeArguments()[0]; } @PersistenceContext public void setEntityManager(EntityManager em) { this.em = em; } protected EntityManager getEntityManager() { return em; } public Class<T> getEntityBeanType() { return entityBeanType; } ... }

Because JavaScript is a loosely typed language, you don t need to specify the type of the arguments or the type of the returned value (if any). All the information about types is inferred at runtime. As a consequence, if the arguments a and b passed to the add function are numbers, the returned value is their sum. If, on the other hand, a and b are strings, the result is the concatenation of the two strings. If the arguments are of different types, strange things may happen, and an error may be raised at runtime. In chapter 13, we ll discuss a technique called parameter validation, which the Microsoft Ajax Library uses to check that the arguments passed to a function are of the expected types. First-class functions can be assigned to an object s properties. The following code creates a calculator object and then assigns two functions to the object s add and multiply properties:

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panied with plenty of FUD (fear, uncertainty, and doubt) to go around. It won t be a walk in the park for most people, as you ll see in this chapter.

There are two things to remember here. The first is that myIntArray[3] isn t an array; it s just an int, like any other int. It just happens to be an int that s an element of an array. The second thing is that myIntArray[3] isn t the third element in the array it s actually the fourth element. Arrays in C# are zero-based, which means that the index of the first element is always zero in this case, myIntArray[0]. This also means that if you declared myIntArray[] to have five elements, the highest index is 4, not 5. If you try to access myIntArray[5], you ll get an error. We know this is counterintuitive, but you ll get used to it quickly enough. Arrays also have a property called Length, which tells you how many objects the array holds this is useful, because you won t always know this when you write your code. Because the indexes start at 0, that means the highest index in an array is always equal to Length - 1. Or to put it another way, arrays are indexed from 0 to Length - 1.

PS (1) > foreach ($i in 1..10) >> { [void] $foreach.MoveNext(); $i + $foreach.current } >> 3 7 11 15 19 PS (2) >

shorter and simpler to read (and the rest of the query too). I ve made my life easier by specifying p and s after the table names in the query shown below (to indicate Product and ProductSubcategory respectively). In this particular example, the match condition is that the value in one column in the first table must be the same as the column in the second table. It so happens that the columns have the same name; therefore, to distinguish between them, I've specified one to be from the table p, and the other from the table s. It wouldn t have mattered if I specified these two columns in the other order equality operations are generally commutative, and it doesn t matter whether I write a=b or b=a. The query in listing 1 returns a set of rows from the two tables, containing all the rows that have matching values in their ProductSubcategoryID columns. This query, as with most of the queries in this chapter, will run on the AdventureWorks database, which is available as a sample database for SQL Server 2005 or SQL Server 2008.

These objects are called direct when they re used as shown in the following code snippet:

The event_sessions table holds a foreign key back to the speakers table. It also has a column, session_index, that holds the order of the EventSessions within the list.

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