Oracle Call Interface Programmer's Guide (924 matching topics) Oracle Objects for OLE (214 matching topics) Performance Planning. SQLJ-Specific Connection JavaBeans for JavaServer Pages Behavior of SqljConnBean (Simple Connections) Example: SQLJ. Overview of the Program Interface The program interface is the software layer between a database application and Oracle Database. The program interface: Provides a security barrier, preventing destructive access to the SGA by client user processes Acts as a. Oracle JVM - O'Reilly Media. Jason Price. 09/2. Both the Oracle. 9i and Oracle. Relational Database. Management Systems (RDBMS) contain. Java Virtual Machine, known as the Oracle JVM. This. allows Java programs to be run from inside the database, and it means that. Oracle's proprietary PL/SQL language can now be written in. SQLJ. In addition, the Oracle Internet Application Server, or i. AS, also. contains an Oracle JVM, which means you can deploy SQLJ programs in the. As you will see in this excerpt from Java Programming with Oracle SQLJ, execution contexts are very important when writing a multithreaded SQLJ program. Getting Up To Date with JDBC API (ONJava.com) Object Computing's Jeff Brown covers the JDBC 3.0. The SQLJ connection beanoracle.sqlj.runtime.SqljConnBean extends the JSP connection bean oracle.jsp.dbutil.ConnBean. SQLJ now supports all the performance enhancements previously available through Oracle's JDBC drivers. See 'SQLJ User's Guide and. It may also be that you are runnng out of open cursors allocated per session. Your SQLJ program is not closing the cursors it is opening. It is intended to give you enough information to create an EJB containing SQLJ for the Oracle JVM. Oracle JDeveloper is a Microsoft Windows-based visual development environment for Java programming. If you are not using an IDE, then use the front-end SQLJ utility, sqlj. The oracle.sql.STRUCT class implements the java.sql.Struct interface (oracle.jdbc2.Struct interface under JDK 1.1.x). This section describes how to use Oracle9i JDBC drivers to access SQLJ object types, SQL types for user-defined object types according to. The IBM Data Server Driver for JDBC and SQLJ contains a number of major enhancements for Version 9.7. Access to currently committed data support The IBM Data Server Driver for JDBC and SQLJ adds the concurrentAccessResolution Connection or DataSource. The Oracle JVM is compatible with the standard Java language. Java Virtual Machine specification. The Oracle JVM. contains a CORBA- compliant Object Request Broker (ORB), and the Oracle JVM. Enterprise Java. Beans standard. Import java.sql.*; import sqlj.runtime.ref.DefaultContext; import oracle.sqlj.runtime.Oracle; #sql iterator MyIter (String ename, int empno, float sal); public class StaffBySQLJThe Oracle JVM runs in the same process and memory space as the database. This results in a significant increase in the scalability and. Java stored programs, because the memory heaps and data. RDBMS are available directly to those Java programs. In. addition, Oracle provides the standard Java class libraries, such as. Oracle JVM runs, resulting in an. Using Enterprise Java. Beans. Enterprise Java. Beans is an architecture that specifies how to. Java components, which are referred to in this article as. The beans are stored in an EJB server, which provides a. Such services. include: Handling database transactions. Persistence of object state. Security. Because the EJB server handles the complexities of providing services. This section is not intended to be a rigorous introduction to the. EJBs, but it is intended to give you enough information to. EJB containing SQLJ for the Oracle JVM. For a detailed discussion. Enterprise Java. Beans programming, I recommend the book Enterprise Java. Beans, 3rd. Edition by Richard Monson- Haefel. In this. section, we will examine a simple bean that uses SQLJ to retrieve a row. The customers table. SQL statement. CREATE TABLE customers (. NUMBER CONSTRAINT customers. The customers table is. SQL statements. INSERT INTO customers (id, first. This article shows you how to create a session. A stateless session bean does not keep the same state between. An easy way to understand the difference. The bean will be named. Customer and was tested using Oracle. Before you. can create a bean, you need to understand the four parts that make up a. The remote interface. The home interface. The bean class. The deployment descriptor. The next few sections talk about these four parts. You'll learn the. Customer bean that we are creating. The Remote Interface. The remote interface defines the methods that implement the business. The methods that are defined in the remote. You can think of the remote. The remote interface for the. Customer bean is contained in the file Customer. Customer. java is the remote interface. Customer bean. The. Row() method retrieves a row from the customers table for which. As you will see later. Row() method uses SQLJ to retrieve the row. All the Java. files are organized into a Java package named customer. The get. Row() method throws the exceptions. Remote. Exception and java. SQLException. The. Remote. Exception is used to notify the client program when. Remote Method Invocation (RMI) error occurs in the bean. The RMI protocol. The. java. sql. SQLException is used to notify the client program when a. SQL error occurs in the bean. The get. Row() method returns a Customer. Record object to. The Customer. Record class. Customer. Record. Customer. Record. Customer. Record class. Date. public class Customer. Record implements java. Serializable . The constructor is the only method in the class. Since the attributes are public, no additional methods. The use of public attributes is not. I only use them here to keep. EJB small. The Home Interface. The home interface defines the methods that are used to manage. Not every home interface will implement. The home interface for the Customer bean, defined in. Customer. Home. java, is shown in the following example. Customer. Home. java is the home interface. Customer bean. Only. Customer bean. When the create(). Create() method defined in. Customer. Bean. sqlj will be transparently called for you. The EJB. server will manage the eventual destruction of the bean automatically. The Bean Class. The bean class contains the actual code for the public methods. The bean class for the Customer bean. Customer. Bean. sqlj, is shown in the following. Customer. Bean. sqlj is the bean class for the customer bean. The. Customer. Bean class contains the following five method stubs: ejb. Create()Run when the new bean instance is created, and may be used to. Activate()Run when the bean instance is about to be activated. Passivate()Run when the bean instance is about to be deactivated. Remove()Run when the bean instance is about to be destroyed, and may be used to. Session. Context()Run after the bean instance is created, and is used to enable the bean. None of these methods are actually implemented by the. Customer. Bean class, but they are required by the EJB component. The get. Row() method, which is implemented by the class. You. specify the customer by passing the customer's ID number as the value for. The get. Row() method retrieves the. SQLJ statement, and returns a new instance of the. Customer. Record class. The retrieved column values are passed to. Customer. Record constructor, and that constructor sets the. Customer. Record attributes to those values. The. Customer. Record object is then returned to the client that called. Row() method. You will notice that the Customer bean doesn't make an explicit. This is because the bean will be deployed in. Oracle JVM, which has an implicit connection to the database. The Deployment Descriptor. The deployment descriptor is used to set the runtime attributes for a. A deployment descriptor is stored in a file and, as will be shown. The deployment descriptor for. Customer. Bean is defined in the file customer. Customer bean. A bean directory. To specify multiple users, use a comma- delimited list of user. State. Management. Type. Specifies whether the bean is stateful (STATEFUL. For those of you using Linux or another flavor of. Unix, you can either type in the necessary Linux/Unix commands or you can. IIOP is a lower level protocol over which RMI. CLASSPATHSpecifies a list of all the class libraries required to compile the. Customer bean. Before running the bean. The bean. bat file uses the javac command- line tool to. Customer. Record. Customer. java. Customer. Home. java. The sqlj command- line tool is then used to translate and. Customer. Bean. sqlj file. Next, bean. bat uses the. Java Archive file named. The - temp option specifies a. The Client Program. Once you've loaded the Customer bean into the database, you can. The program. Client. Customer. The main() method in this program gets the following arguments. The IIOP service. The bean name. The database username. The database password. Next, after the command- line arguments are retrieved, the Java Naming. Directory Interface (JNDI) is initialized. Hashtable env = new Hashtable(). Context. URL. The env hashtable is used to store the parameters that. Customer bean. Once. JNDI has been initialized, a Customer. Home object is created. Customer. Home customer. The Customer. Home object is used to call the. After the bean has been retrieved, a Customer object is. Customer customer. A. Customer. Record object is then created to hold the row returned. Customer bean's get. Row() method. Customer. Record customer. The commands in this batch file compile and run the. I've just discussed. If you execute this file, be sure that these variables are set. Next, the javac command is issued. Client. java file. Finally, the java command. Notice the four arguments that are. As mentioned earlier, these are: %ORACLE. The. main() method in the client program retrieves the arguments. Customer bean, and displays the column. The following example shows the client. MS- DOS prompt in order to compile and run the Client program. D: \> client. bat. Customer Information. There are several sources for more information on. SQLJ, including Oracle's. Technet Web site and the SQLJ Web site. You can also read my book, Java. Programming with Oracle SQLJ Jason Price is currently employed as a product manager with. Oracle. He has contributed to many products at Oracle, including the. CRM applications. He is a. certified Oracle DBA and Application Developer, and he has over ten years. He holds a Bachelor of Science degree (with honors) in. Physics from the University of Bristol, England. Jason currently resides in.
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