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writer: Steven Feuerstein with invoice PrybilPublisher: O'Reilly, 2014Pages: 1392ISBN: 978-1449324452Aimed at: Oracle developersRating: 5Reviewed with the aid of: Kay Ewbank
this is a new version of Steven Feuerstein’s classic book on Oracle PL/SQL programming.
As such it wants dinky or no introduction to the Oracle developer community; it will live unusual to discover a bookshelf belonging to an Oracle developer without this publication on it, and it deserves its area, having been probably the most useful booklet on the discipline for the ultimate twenty years. This newest version brings the book up thus far with Oracle Database 12c free up 1.
here's no simple read, both in length or in content. It’s not a tutorial with the aid of any capability, but Feuerstein explains the internal workings of PL/SQL with a lot of code examples. He has a brilliant writing trend and makes exercise of humor and an simple chatty vogue to fulfill the manner of knowing PL/SQL as painless as possible. through the years and variations diverse authors acquire co-authored with Feuerstein; this edition is written with invoice Prybil, notwithstanding actually a considerable number of chapters acquire been authored or co-authored with the aid of divide writers, each and every taking their personal area of talents. One aspect to live cognizant is that Feuerstein does import on you live cognizant of Oracle’s edition of SQL, so if you’re coming to the book from a different history such as T-SQL, you’ll should accept up to velocity with Oracle SQL first to fulfill the most of this booklet.
if you’re not frequent with the publication, the crucial factor is that it covers every thing from the fundamentals of the language through application constitution, coping with records, SQL in PL/SQL, constructing purposes, to advanced PL/SQL issues reminiscent of software security and using Java from PL/SQL. There are extensive guidance on the pass to write first rate code, hints on where issues could eddy up, and assistance of the pass to optimize your solutions. once the language has been delivered within the first ingredients of the ebook, later chapters appear greater at selected issues and reveal a pass to clear up them with descriptions and dialogue of why a selected route has been chosen. in many situations you’re shown an instance written in a single method, then modified to utilize a particular characteristic or concept to demonstrate you the pass it alters the style you're employed and the pass you code for it.
The leading alterations between this edition and the outdated one are information on the adjustments to Oracle 12C, starting with the ACCESSIBLE_BY clause, which specifies which software instruments in a kit are allowed to invoke subprograms. This skill subprograms are with no peril hidden from complete other software gadgets except you yelp otherwise.
a different trade that’s coated is BEQUEATH CURRENT_USER for views. This means which you can appoint roles to particular person PL/SQL programs and standalone classes. BEQUEATH CURRENT_USER acts as even though it were an invoker rights unit.
the new conditional compilation directives are defined, as are the two new ways of enhancing PL/SQL characteristic performance – WITH role and including the UDF pragma to the program unit.
As that you would live able to probably inform from this listing, the changes from the outdated version are fairly particular and except you’re battling knowing them in particular, you could live jubilant along with your fifth version. if you don’t acquire an previous edition and furthermore you requisite to software PL/SQL, here is the book to buy.
Oracle has offered programs for a while now, but until recently it's been complicated, if not impossible, to sustain away from 'out of context' execution of features and procedures; in many circumstances paraphernalia code is designed to live used in the context of the kit, now not as stand-alone methods and services. In free up 18.104.22.168, Oracle has addressed this vicissitude with the accessible by means of clause. This clause allows developers to refine the scope of a system or feature cognomen and generate an mistake message when that manner or feature is referred to as outside of the paraphernalia context. Let's construct an illustration for case how this is written and what effects are acquired when the context-restrained code is done in context and out.
accessible by using can obstruct inevitable styles of program units or named application gadgets of an unspecified class. The syntax for the clause is:accessible with the aid of ([unit_kind] [schema.]unit_name)
...where [unit_kind] is an non-compulsory parameter indicating technique, characteristic, package, trigger or category, [schema] is the schema the region the unit is determined and unit_name is the identify of the technique, feature or paraphernalia having constrained entry. When [unit_kind] is offered then a particular kit, procedure, feature, trigger or ilk can best live known as or used from within the defined context. When [unit_kind] isn't supplied then any of the listed kinds may furthermore live referenced provided that they've the declared unit_name. they are going to start with an access by using cognomen illustration:SQL> -- SQL> -- Create a manner only attainable SQL> -- by pass of a named itemSQL> -- SQL> -- expostulate can acquire any supported class SQL> -- SQL> create or change technique my_restrict_proc 2 purchasable by using (restrict_fc) three as 4 start 5 dbms_output.put_line('executed my_restrict_proc.'); 6 conclusion; 7 / process created. SQL> SQL> -- SQL> -- Create a characteristic most efficacious purchasable SQL> -- by means of a triggerSQL> -- SQL> create or change feature top_protected_f recrudesce number 2 obtainable by means of (set off restrict_fc ) as 3 begin four recrudesce 1.27349; 5 conclude top_protected_f; 6 / function created. SQL> SQL> -- SQL> -- Create a feature SQL> -- SQL> -- role calls the technique that may name SQL> -- the unit having the confined nameSQL> -- SQL> create or change feature restrict_fc recrudesce number AUTHID DEFINER IS 2 role g recrudesce quantity DETERMINISTIC IS 3 begin 4 recrudesce 1.27349; 5 conclusion g; 6 start 7 my_restrict_proc; eight recrudesce g() - DBMS_RANDOM.value(); 9 conclusion restrict_fc; 10 / characteristic created. SQL> SQL> -- SQL> -- Execute the role SQL> -- SQL> select restrict_fc FROM twin; RESTRICT_FC ----------- .78662621 done my_restrict_proc. SQL>
for the judgement that they didn't are attempting to bypass the 'security' they worked to enforce the limited code accomplished devoid of error. notice that they weren't required to declare any unit_kind in the preliminary attainable by using clause, which allowed us to declare the unit_kind in a different PL/SQL software unit 'down the road'; this makes it less difficult in programs to upshot in writing an available through clause that can furthermore live reused in different packages or stand-by myself procedures that exercise objects of the equal identify but having diverse unit_kind definitions.
Let's now gape at a paraphernalia that includes each public (executable with the aid of any person in any context) and personal (executable best by means of the declared program unit) methods and spot what happens when an attempt is made to execute the 'private' manner backyard of its declared context:SQL> SQL> set reverberate on linesize a hundred and fifty serveroutput on size 1000000 SQL> SQL> -- SQL> -- Create a package with public and private approaches SQL> -- SQL> create or exchange kit my_top_lvl_pkg as 2 manner my_first_lvl_proc; three process my_next_lvl_proc accessible by pass of (manner my_top_lvl_proc); four conclude my_top_lvl_pkg; 5 / equipment created. SQL> SQL> note errors No blunders. SQL> SQL> -- SQL> -- silhouette those approaches and who/what can access them SQL> -- SQL> create or exchange package corpse my_top_lvl_pkg 2 as 3 manner my_first_lvl_proc as four start 5 dbms_output.put_line('achieved my_top_lvl_pkg.my_first_lvl_proc'); 6 end; 7 system my_next_lvl_proc purchasable by means of (process my_top_lvl_proc) as eight start 9 dbms_output.put_line('accomplished my_top_lvl_pkg.my_next_lvl_proc'); 10 end; 11 end; 12 / equipment physique created. SQL> SQL> reveal error No errors. SQL> SQL> -- SQL> -- Create process to execute both package methods SQL> -- SQL> create or substitute process my_top_lvl_proc 2 as three begin four dbms_output.put_line('my_top_lvl_proc calls my_top_lvl_pkg.my_next_lvl_proc '); 5 my_top_lvl_pkg.my_next_lvl_proc; 6 end; 7 / manner created. SQL> SQL> array blunders No errors. SQL> SQL> -- SQL> -- Execute methods as intended, from in the equipment SQL> -- SQL> exec my_top_lvl_proc; my_top_lvl_proc calls my_top_lvl_pkg.my_next_lvl_proc completed my_top_lvl_pkg.my_next_lvl_proc PL/SQL manner efficiently achieved. SQL> SQL> SQL> -- SQL> -- are attempting to summon included technique stand-on my own SQL> -- SQL> exec my_top_lvl_pkg.my_next_lvl_proc; start my_top_lvl_pkg.my_next_lvl_proc; end; * ERROR at line 1: ORA-06550: line 1, column 7: PLS-00904: insufficient privilege to entry expostulate MY_NEXT_LVL_PROC SQL>
We observe that any try and execute MY_NEXT_LVL_PROC with the aid of itself generates an error, which continues it in the desired context in order that undesired effects cannot live generated. [As mentioned before some procedures and functions in a package can confidence on variables and intermediate results generated by program units within that package; executing program units with such dependencies as 'stand-alone' program units can bear incorrect results.]
Being capable of obviate the execution atmosphere on PL/SQL program instruments that import on clear conditions to live met is a long past due feature that should live investigated and used via builders. no longer will programmers ought to clarify why a manner or role would not travail appropriately when called outdoor of its intended ambiance; it effectively might not execute outdoor of the mandatory context. And, to cite Martha Stewart, "it truly is a splendid issue."
See complete articles by pass of David Fitzjarrell
As many builders will attest, Oracle's database utilities can live complicated to travail with. however a new shareware program called PL/SQL may additionally fulfill it less demanding to enlarge and configure apps using Oracle. This product evaluate examines PL/SQL's capabilities.via Stuart Vessels
Wouldn’t or not it's trait if you may edit an Oracle database desk directly inside a spreadsheet-like grid, the manner that you would live able to in access and Microsoft SQL’s business manager? As many Oracle clients are painfully aware, the database paraphernalia doesn't offer an app that permits you to array the consequences of a question within an editable grid. The closest device Oracle presents is its SQL Plus utility, which is in fact a command prompt for executing SQL statements. The results are not in a grid, and they’re now not editable.
happily, there’s a advantageous and simply attainable third-birthday party shareware utility that offers a grid-like interface for viewing and editing Oracle tables. The product, proven in motif A, is PL/SQL Developer. It’s produced by Dutch software enterprise Allround Automations.NotePL/SQL Developer will hurry on windows ninety five and windows NT 4 or later. To hook up with an Oracle database, PL/SQL Developer requires any 32-bit SQL*net or Net8 version.
actually, PL/SQL Developer is a powerful deal greater than simply an Oracle table editor. It’s an integrated edifice environment that has an unbelievable assortment of points designed to fulfill it more convenient to increase, test, debug, and optimize Oracle PL/SQL-saved software gadgets, equivalent to applications and triggers.
however you don’t requisite to live a developer to respect PL/SQL Developer’s SQL Window. you can exercise this device to monitor the outcomes of any SQL observation in an editable grid, as proven in determine B. once you edit a bailiwick entry or add a new listing, you relegate the change to the database through clicking the relegate icon. The SQL Window even permits you to opt for and copy data, columns, or rows. you could then exercise this approach to stick new records into a table, or you can paste the records into an outdo or keep file. Of path, there’s a menu command for exporting query outcomes to a lot of generic file codecs, corresponding to outdo or live aware. additionally, the program remembers the SQL statements you execute by means of storing them in a historical past buffer. Recalling previously accomplished SQL statements is as simple as looking a listing and clicking on the one you desire.
The SQL Window is barely the tip of the iceberg. PL/SQL Developer has many greater tools and lines so that you can attraction to developers and database directors. to observe simply how potent this software can be, check out Allround Automations complete aspects list.
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Procedure Builder is allotment of Oracle's Developer 2000 evolution environment. It allows you to develop and debug PL/SQL program units for exercise in Developer 2000 applications. With Developer 2000, PL/SQL is used on the client to program the conduct behind the forms, reports, and menus that you develop. You conclude up with a PL/SQL engine on the client as well as on the server. A nice profit of this is that Procedure Builder can live used to execute PL/SQL code without having to live connected to a database.
Note - Many of the advanced features discussed later in this book are available only when executing PL/SQL code in the database.Starting Procedure Builder
If you acquire Developer 2000 installed, you start Procedure Builder by selecting Start, Programs, Developer 2000 R2.0, Procedure Builder. The opening screen is shown in motif 1.5 and is divided into three sections.
Procedure Builder's opening screen.(Click for complete size)
As you can see, the Procedure Builder window is divided into three major parts. The expostulate Navigator window allows you to navigate through the various program units, PL/SQL libraries, and database objects to which you acquire access. The other two parts of the array combine to fulfill up the PL/SQL Interpreter window. The top pane is used when debugging PL/SQL code and shows the code being debugged. The bottom pane is where you can ilk in and execute ad-hoc PL/SQL blocks.
New Term - PL/SQL may live used to write procedures, functions, package bodies, package types, and triggers. These constructs are referred to as program units.Using Interactive PL/SQL
The PL/SQL interpreter allows you to enter a PL/SQL anonymous screen and acquire it executed. The little screen in Listing 1.2, that you typed in earlier, is one such anonymous block. You can ilk that screen into Procedure Builder and execute it, but first you requisite to fulfill one little change. The code shown in Listing 1.2 contains the following two calls to DBMS_OUTPUT:dbms_output.put_line('The variable X = '); dbms_output.put_line(x);
DBMS_OUTPUT is a package that only exists within the database server. Procedure Builder will recrudesce errors if you try to execute the code as it stands now. Fortunately, Oracle has a package similar to DBMS_OUTPUT that can live used in its region when you are executing code on a client. The cognomen of that package is TEXT_IO, and it furthermore contains an entry point named PUT_LINE. prefer the code shown in Listing 1.2, supplant the calls to DBMS_OUTPUT.PUT_LINE with TEXT_IO.PUT_LINE, and you acquire the code shown in Listing 1.6. This code will hurry from Procedure Builder.Listing 1.6 A PL/SQL screen Using TEXT_IO That Will hurry from Procedure Builder DECLARE x INTEGER; BEGIN x := 72600; text_io.put_line('The variable X = '); text_io.put_line(x); END;
Now, you can prefer this code and ilk it into Procedure Builder's PL/SQL Interpreter. The interpreter will automatically execute the screen when you finish entering the last line. The results will gape fancy the following:The variable X = 72600
Procedure Builder has been written specifically to travail with PL/SQL. Unlike SQL*Plus, you upshot not requisite to enter a forward-slash to divulge Procedure Builder that you are done entering a screen of PL/SQL.Creating the SS_THRESH Function
Creating a role (or any other program unit such as a procedure or package) using Procedure Builder requires a bit more than just typing the CREATE role statement into the interpreter. To create a function, you requisite to divulge Procedure Builder that you want to create a new program unit. upshot this by selecting the File, New, Program Unit menu option. You will observe the dialog box shown in motif 1.6.
Creating a New Program Unit.
This dialog contains radio buttons allowing you to select the ilk of program unit that you are creating and furthermore contains a textbox for the program unit's name. select Function, ilk the cognomen SS_THRESH into the textbox, and click OK. You will observe a screen similar to that shown in motif 1.7.
Entering the code for SS_THRESH.
Figure 1.7 shows the role with the code already written. Of course, Procedure Builder does not write the code for you. When Procedure Builder opens this window, it places a skeleton role in the textbox. You acquire to fill in the details. When you accept the code entered the pass that you want it, click the Compile button to compile it, and then click the close button to close the window.
To execute the role that you just created, ilk the following statement into the PL/SQL interpreter:TEXT_IO.PUT_LINE(SS_THRESH);
When you execute this statement, Procedure Builder will execute the role and array the following results:72600 Connecting to a Database
In addition to creating PL/SQL program units on the client, Procedure Builder can furthermore live used to create and execute program units in a database. To upshot this, you first requisite to connect to a database. exercise the File, Connect menu option to connect to a database. Once you've logged in, you will live able to browse database program units using the expostulate Navigator. motif 1.8 shows the program units owned by the user named JEFF.
Program units in the JEFF schema.
To create a stored role or other program unit in the database, result these steps:
Click to highlight the Stored Program Units entry under the user's name.
Click the Create Toolbar button.
Proceed as you would when creating a local program unit.
Except for having to select the schema, the process for creating a PL/SQL role in the database is the selfsame as for creating one locally.Using SQLPlus Worksheet
If you acquire Enterprise Manager available, reckon using SQLPlus Worksheet for the examples in this book. SQLPlus Worksheet is completely compatible with SQL*Plus, and can live used for complete the examples in this book. The edge that SQL*Plus worksheet has over SQL*Plus is in the interface. Rather than ilk in large blocks of code one line at a time, you can exercise a text editor-like interface. After you accept the code entered the pass that you want it, you can click a toolbar button to execute it.Executing a PL/SQL screen Using SQLPlus Worksheet
Figure 1.9 shows the SQLPlus Worksheet.
The SQLPlus Worksheet.
As you can see, the SQLPlus Worksheet screen is divided into two halves. The upper half is used for the entry and editing of SQL statements and PL/SQL blocks. The lower half is used to array output. The execute toolbar button, the one with the lightning bolt, is used to execute the statements that you acquire entered in the upper pane.
There are two ways to exercise SQLPlus Worksheet to execute commands from a file. One pass is to exercise the File, Open menu option to load the contents of a file into the upper pane, and then click the lightning bolt button. The other pass is to exercise the Worksheet, hurry Local Script menu option.Summary
In this chapter you scholarly a dinky about PL/SQL, what it is, and why it is used. You know that PL/SQL is Oracle's procedural language extension to SQL, and that you can exercise it to write procedures and functions that execute on the server.
This chapter furthermore explains the relationship between PL/SQL, SQL, and SQL*Plus. This should give you a splendid grasp of how PL/SQL fits into the larger Oracle picture.
You wrote your first PL/SQL stored function, which should give you a splendid feel for the mechanics of programming with PL/SQL.
SQL*Plus is the instrument used throughout this book for PL/SQL code examples. SQLPlus Worksheet and Procedure Builder are two other tools that may furthermore live used to write and execute PL/SQL code.Q & A
Where does PL/SQL code execution prefer place?
Usually, execution takes region at the server level. For the examples in this book, that will always live the case. Some Oracle products, such as Developer/2000, furthermore acquire the capability to execute PL/SQL blocks locally on the client machine.
Can I write a complete application with PL/SQL?
Generally speaking you cannot, at least not as most people envision an application. For an end-user application, you would still requisite a tool, such as PowerBuilder or Developer/2000, in order to design screens and generate reports.
I executed some PL/SQL code which used dbms_output.put_line() to print some data, but I didn't observe anything. How come?
You probably forgot to enable the server output option. exercise this SQL*Plus command:SET SERVEROUTPUT ON
If you forget that, your PL/SQL output goes to oblivion.
I am using Procedure Builder, and I accept errors when I try to execute code that contains calls to dbms_output.put_line(). Why?
When you exercise Procedure Builder to execute code locally, you must exercise text_io.put_line rather than dbms_output.put_line(). If you are using Procedure Builder, and you acquire connected to a database, you will live able to execute calls to dbms_output.put_line(), but you won't observe the results.
Use the following workshop to test your comprehension of this chapter and upshot what you've scholarly into practice. You'll find the answers to the quiz and exercises in Appendix A, "Answers."Quiz
What tells SQL*Plus to send your PL/SQL code to the Oracle database for execution?
What is the fundamental basis of complete PL/SQL code?
List an edge of pushing program logic up to the server level.
Name three Oracle products that exercise PL/SQL.
What command tells SQL*Plus to array PL/SQL output?
Name at least two options for managing your PL/SQL source code.
If you didn't encounter any errors when compiling your first function, try putting some in on purpose. Then try out the note ERRORS command.
Try each of the three ways mentioned in the chapter for managing your source code. Become chummy with the SQL*Plus EDIT command. Try using the @ command or the START command to execute your PL/SQL code from a text file.
© Copyright Pearson Education. complete rights reserved.
This article is brought to you by Sams Publishing, publisher of Sams educate Yourself PL/SQL in 21 Days, Second Edition.
Miscellaneous SoftwarePress Release Summary:
In addition to facilitating SQL script and PL/SQL program unit development, OraDeveloper Studio v2.50 provides abet with query creation and execution, user and privilege management, as well as exploration of existing databases. Solution furthermore aids in schema objects modification, data export and import, and database project creation. Database expostulate Dependency is supported, and user comments are available for schema objects. Context-sensitive code completion is furthermore included.Original Press Release: Core Lab Announces the Release of OraDeveloper Studio 2.50
OraDeveloper Studio is a powerful evolution environment for working with Oracle. OraDeveloper Studio provides the easiest pass to develop SQL scripts and PL/SQL program units, create and execute queries, manage users and privileges, explore existing databases, modify schema objects, export and import data, create database projects, and more.
Version 2.50 introduces a large number of new features:
o Advanced Context-sensitive Code Completiono champion for some new SQL*Plus commandso Keyboard Shortcut Customizationo Extremely customizable DDL generationo New Schema Objects Clusters: database links, cluster indexes, partitioned indexeso Database expostulate Dependency supportedo User comments available for schema objectso Enhanced Code Templates: templates preview and inserting by hotkey addedo Schema Export to SQL scripto New Database Project Wizardo Database expostulate Search Enhancementso Session Manager Improvementso Database Explorer Enhancements
Other New Features
o PL/SQL compilation warning champion added.o Oracle Instant Client champion added.o Date format can now live set for the Data Editor.o selfsame file can live included several times in the deployment order.o Table columns can now live created using copy/paste operations.
You can try out the new version of OraDeveloper Studio by downloading it at www.crlab.com/oradev/download.html. They are looking forward to your comments and suggestions.
Core Lab evolution teamhttp://www.crlab.com/oradev/Related Thomas Industry Update
500,000+ minute Supplier Profiles300,000+ Articles & Whitepapers6 Million+ Industrial Products10 Million+ 2D & 3D CAD Drawings
As many developers will attest, Oracle's database utilities can live difficult to travail with. But a new shareware program called PL/SQL may fulfill it easier to develop and configure apps using Oracle. This product review examines PL/SQL's capabilities.By Stuart Vessels
Wouldn’t it live nice if you could edit an Oracle database table directly within a spreadsheet-like grid, the pass you can in Access and Microsoft SQL’s Enterprise Manager? As many Oracle users are painfully aware, the database package does not offer an app that allows you to array the results of a query within an editable grid. The closest instrument Oracle offers is its SQL Plus utility, which is basically a command prompt for executing SQL statements. The results are not in a grid, and they’re not editable.
Fortunately, there’s a useful and easily accessible third-party shareware application that provides a grid-like interface for viewing and editing Oracle tables. The product, shown in motif A, is PL/SQL Developer. It’s produced by Dutch software company Allround Automations.NotePL/SQL Developer will hurry on Windows 95 and Windows NT 4 or later. To connect to an Oracle database, PL/SQL Developer requires any 32-bit SQL*Net or Net8 version.
Actually, PL/SQL Developer is much more than just an Oracle table editor. It’s an integrated evolution environment that has an impressive assortment of features designed to fulfill it easier to develop, test, debug, and optimize Oracle PL/SQL-stored program units, such as packages and triggers.
But you don’t acquire to live a developer to appreciate PL/SQL Developer’s SQL Window. You can exercise this instrument to array the results of any SQL statement in an editable grid, as shown in motif B. Once you edit a bailiwick entry or add a new record, you relegate the modification to the database by clicking the relegate icon. The SQL Window even allows you to select and copy records, columns, or rows. You can then exercise this technique to paste new records into a table, or you can paste the data into an outdo or Word file. Of course, there’s a menu command for exporting query results to a variety of favorite file formats, such as outdo or Word. In addition, the program remembers the SQL statements you execute by storing them in a history buffer. Recalling previously executed SQL statements is as simple as browsing a list and clicking on the one you want.
The SQL Window is just the tip of the iceberg. PL/SQL Developer has many more tools and features that will appeal to developers and database administrators. To observe just how powerful this program can be, check out Allround Automations comprehensive features list.
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