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A general-purpose programming language must allow a program to store and retrieve data. A variable is a name that represents data stored in memory during program execution. C# provides four categories of variables, each of which will be discussed in detail. These kinds are listed in Table 3-4. Table 3-4. The four types of variables

This annotation denotes the Java class as defining a web service. This annotation takes at most five arguments, shown in Table 3-1. Table 3-1. @WebService Annotation Attributes

These hold temporary data within the scope of a method. These hold data associated with a type. These temporary variables are used to pass data from one method to another method. These are used to store temporary or type-associated data.

Some of them are available only for specified databases; for instance, the sequence strategy isn t supported in MYSQL but is provided by Oracle. JPA also provides a way to generate identifiers.

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The name of the port type of the WSDL that will be generated for this service. This is the XML namespace that will be used in the generated WSDL. The default value is specified by the JAX-RPC specification (at http://java.sun.com/xml/ jaxrpc/index.jsp). The name of the service. This maps to the <wsdl:service> element of the WSDL file. The default value is the unqualified name of the Java class with the string Service appended. The relative or absolute URL of a predefined WSDL file that this web service will implement. If you leave this undefined, a WSDL will be generated for you by the jwsc Ant task. If you do enter a value here, the jwsc Ant task will return errors if the Java class is inconsistent with the port types and bindings specified in the WSDL file. The fully qualified name of an existing service endpoint interface file. If you specify this value, the jwsc Ant task won t generate the interface for you, and you re required to have the interface file in your CLASSPATH. If this value is undefined, the jwsc Ant task will generate the interface for you.

A variable must be declared before it can be used. The variable declaration defines the variable, and accomplishes two things: It gives the variable a name and associates a type with it. It allows the compiler to allocate memory for it. A simple variable declaration requires at least a type and a name. The following declaration defines a variable named var2, of type int: Type int var2; Name For example, Figure 3-11 represents the declaration of four variables and their places on the stack.

In general, we recommend always specifying at least the name and the targetNamespace attributes. To use this annotation you need to import javax.jws.WebMethod in your Java source code.

Besides declaring a variable s name and type, a declaration can also initialize its memory to a specific value. A variable initializer consists of an equals sign followed by the initializing value, as shown here: Initializer int var2 = 17; Local variables without initializers have an undefined value, and cannot be used until they have been assigned a value. Attempting to use an undefined local variable causes the compiler to produce an error message. Figure 3-12 shows a number of local variable declarations on the left, and the resulting stack configuration on the right. Some of the variables have initializers and others do not.

We'll look at each of these strategies in turn, starting with the database sequence. For this section, we'll insert three books into the database. Below is the Launch class used to insert records into the Book table: package com.hibernaterecipes.chapter2; import java.util.Date; import java.util.List; import import import import import org.hibernate.Session; org.hibernate.SessionFactory; org.hibernate.Transaction; org.hibernate.cfg.Configuration; org.hibernate.stat.Statistics;

Some kinds of variables are automatically set to default values if they are declared without an initializer, and others are not. Variables that are not automatically initialized to default values contain undefined values until the program assigns them a value. Table 3-5 shows which types of variables are automatically initialized and which are not. I will cover each of the five variable types later in the text. Table 3-5. Types of Variables

The @SoapBinding annotation allows you to specify the information that s contained in the <wsdlsoap:binding> section of a WSDL file (see Table 3-2).

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