Db2 For Dummies Pdf This tutorial shows you how to use DB2 for z/OS in the z/OS terminal For example, the 'ISPF/PDF Primary Option Menu' is the default name of a panel.
Congratulations on your decision to read this book, Sams Teach Yourself PL/SQL in 21 Days, Second Edition! If you are new to the Oracle environment, this book will help you learn and master Oracle's built-in procedural language quickly. Knowledge of PL/SQL (Procedural Language/Structured Query Language) is becoming a fundamental necessity no matter which of Oracle's many products you use. Today, on your first day of this PL/SQL tutorial, you will accomplish these tasks: • Learn what PL/SQL is and why you should master it •. • • • Learn what resources you need to finish this book • Write your first PL/SQL function Over the remaining 20 days, you'll delve deeper into the power and capabilities of this language and learn how to leverage its power in your applications regardless of whether you are doing client/server programming with Oracle's tools (such as Developer/2000), using other front-end tools (such as PowerBuilder), or simply writing some batch jobs that run on the server.
What Is PL/SQL? PL/SQL is a procedural language that Oracle developed as an extension to standard SQL to provide a way to execute procedural logic on the database.
New Term - If you have worked with relational databases in the past, you are no doubt familiar with SQL, which stands for Structured Query Language. SQL itself is a powerful declarative language. It is declarative in the sense that you describe the results that you want but not how they are obtained. This is good because you can insulate an application from the specifics of how the data is physically stored. A competent SQL programmer can also push a great deal of processing work back to the server level through the creative use of SQL.
There are limits, though, to what you can accomplish with a single declarative query. The real world is seldom as neat and clean as we would like it to be. Developers often find themselves needing to execute several queries in succession and process the specific results of one query before going on to the next. This leads to two problems in a client/server environment: • The procedural logic, that is, the definition of the process, resides on client machines. • The need to look at the data from one query and use it as the basis for the next query results in an increased amount of network traffic.
Why are these problems? The procedural logic on client machines can quickly become out of sync if the software is upgraded. It can also be implemented incorrectly, resulting in a loss of database integrity.
The need to pull down large amounts of intermediate data to a client results in a long wait for the end users who must sit there staring at the hourglass while the data is transferred to their machines. The cumulative effects of a number of clients pulling large amounts of data across the network further decrease performance. PL/SQL provides a mechanism for developers to add a procedural component at the server level. It has been enhanced to the point where developers now have access to all the features of a full-featured procedural language at the server level. It also forms the basis for programming in Oracle's continually evolving set of client/server development tools, most notably Developer/2000. Why Learn PL/SQL?
If you are developing with Oracle products, Developer/2000 for example, the answer to this question is simple. You need to know PL/SQL because those products use PL/SQL for any procedural code.
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But what if you don't develop with Oracle's products? What if all you use is Oracle's database engine? Is PL/SQL of any use to you? Absolutely it is.
Regardless of the front-end tool that you are using, you can use PL/SQL to perform processing on the server rather than the client. You can use PL/SQL to encapsulate business rules and other complicated logic. It provides for modularity and abstraction. You can use it in database triggers to code complex constraints, which enforce database integrity; to log changes; and to replicate data. PL/SQL can also be used with stored procedures and functions to provide enhanced database security.
Finally, it provides you with a level of platform independence. Oracle is implemented on many hardware platforms, but PL/SQL is the same on all of them. It makes no difference whether you are running Personal Oracle on a laptop or Oracle8i Enterprise on UNIX.