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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 bespeak on Oracle PL/SQL programming.
As such it wants miniature or no introduction to the Oracle developer community; it will breathe unusual to ascertain 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 bespeak up thus far with Oracle Database 12c free up 1.
here's no facile 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 exhaust of humor and an facile chatty vogue to originate the manner of knowing PL/SQL as painless as possible. through the years and variations diverse authors absorb co-authored with Feuerstein; this edition is written with invoice Prybil, notwithstanding actually a considerable number of chapters absorb been authored or co-authored with the aid of distinct writers, each and every taking their personal district of talents. One aspect to breathe sensible is that Feuerstein does weigh on you breathe sensible of Oracle’s edition of SQL, so if you’re coming to the bespeak from a different history such as T-SQL, you’ll should obtain up to velocity with Oracle SQL first to originate 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 gyrate 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 look greater at selected issues and disclose a pass to pellucid 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 sole 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 danger hidden from consummate other software gadgets except you inform otherwise.
a different trade that’s coated is BEQUEATH CURRENT_USER for views. This means which you can equip 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 duty and including the UDF pragma to the program unit.
As that you would breathe 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 breathe blissful along with your fifth version. if you don’t absorb an previous edition and likewise you requisite to software PL/SQL, here is the bespeak to buy.
Oracle has offered programs for a while now, but until recently it's been complicated, if not impossible, to preserve away from 'out of context' execution of features and procedures; in many circumstances materiel code is designed to breathe used in the context of the kit, now not as stand-alone methods and services. In free up 220.127.116.11, Oracle has addressed this rigor with the accessible by means of clause. This clause allows developers to refine the scope of a system or feature appellation and generate an oversight message when that routine or feature is referred to as outside of the materiel context. Let's construct an illustration for sample how this is written and what effects are acquired when the context-restrained code is done in context and out.
accessible by using can bar certain 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 Place the unit is determined and unit_name is the identify of the technique, feature or materiel having constrained entry. When [unit_kind] is offered then a particular kit, procedure, feature, trigger or ilk can best breathe known as or used from within the defined context. When [unit_kind] isn't supplied then any of the listed kinds may likewise breathe referenced provided that they've the declared unit_name. they are going to start with an access by using appellation illustration:SQL> -- SQL> -- Create a routine only attainable SQL> -- by pass of a named itemSQL> -- SQL> -- expostulate can absorb 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 effectual purchasable SQL> -- by means of a triggerSQL> -- SQL> create or change feature top_protected_f revert number 2 obtainable by means of (set off restrict_fc ) as 3 begin four revert 1.27349; 5 halt top_protected_f; 6 / function created. SQL> SQL> -- SQL> -- Create a feature SQL> -- SQL> -- duty calls the technique that may name SQL> -- the unit having the confined nameSQL> -- SQL> create or change feature restrict_fc revert number AUTHID DEFINER IS 2 duty g revert quantity DETERMINISTIC IS 3 begin 4 revert 1.27349; 5 conclusion g; 6 start 7 my_restrict_proc; eight revert g() - DBMS_RANDOM.value(); 9 conclusion restrict_fc; 10 / characteristic created. SQL> SQL> -- SQL> -- Execute the duty SQL> -- SQL> select restrict_fc FROM twin; RESTRICT_FC ----------- .78662621 done my_restrict_proc. SQL>
for the reason that they didn't are attempting to bypass the 'security' they worked to implement 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 save in writing an available through clause that can likewise breathe reused in different packages or stand-by myself procedures that exhaust objects of the equal identify but having diverse unit_kind definitions.
Let's now study at a materiel 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' routine backyard of its declared context:SQL> SQL> set reecho 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 routine my_first_lvl_proc; three process my_next_lvl_proc accessible by pass of (manner my_top_lvl_proc); four halt my_top_lvl_pkg; 5 / equipment created. SQL> SQL> panoply 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 routine 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 build created. SQL> SQL> disclose 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> panoply 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 routine efficiently achieved. SQL> SQL> SQL> -- SQL> -- are attempting to convene 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 survey 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 breathe generated. [As mentioned before some procedures and functions in a package can depend on variables and intermediate results generated by program units within that package; executing program units with such dependencies as 'stand-alone' program units can produce incorrect results.]
Being capable of forestall the execution atmosphere on PL/SQL program instruments that weigh on sure conditions to breathe met is a long past due feature that should breathe investigated and used via builders. no longer will programmers ought to clarify why a routine or duty would not drudgery 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 proper issue."
See consummate articles by pass of David Fitzjarrell
As many builders will attest, Oracle's database utilities can breathe elaborate to drudgery with. however a new shareware program called PL/SQL may additionally originate it less demanding to augment 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 breathe able to in access and Microsoft SQL’s traffic manager? As many Oracle clients are painfully aware, the database materiel doesn't present an app that permits you to panoply 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 figure A, is PL/SQL Developer. It’s produced by Dutch software enterprise Allround Automations.NotePL/SQL Developer will Run 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 mighty deal greater than simply an Oracle table editor. It’s an integrated structure environment that has an unbelievable assortment of points designed to originate 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 breathe a developer to respect PL/SQL Developer’s SQL Window. you can exhaust this device to monitor the outcomes of any SQL observation in an editable grid, as proven in determine B. once you edit a territory 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 exhaust this approach to stick new records into a table, or you can paste the records into an transcend or keep file. Of path, there’s a menu command for exporting query outcomes to a lot of generic file codecs, corresponding to transcend or breathe 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 facile 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 survey simply how potent this software can be, check out Allround Automations complete aspects list.
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Procedure Builder is Part of Oracle's Developer 2000 development environment. It allows you to develop and debug PL/SQL program units for exhaust 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 halt up with a PL/SQL engine on the client as well as on the server. A nice benefit of this is that Procedure Builder can breathe used to execute PL/SQL code without having to breathe connected to a database.
Note - Many of the advanced features discussed later in this bespeak are available only when executing PL/SQL code in the database.Starting Procedure Builder
If you absorb Developer 2000 installed, you start Procedure Builder by selecting Start, Programs, Developer 2000 R2.0, Procedure Builder. The opening screen is shown in figure 1.5 and is divided into three sections.
Procedure Builder's opening screen.(Click for replete 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 absorb access. The other two parts of the panoply combine to originate 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 breathe 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 block and absorb it executed. The petite block in Listing 1.2, that you typed in earlier, is one such anonymous block. You can ilk that block into Procedure Builder and execute it, but first you requisite to originate one petite 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 revert errors if you try to execute the code as it stands now. Fortunately, Oracle has a package similar to DBMS_OUTPUT that can breathe used in its Place when you are executing code on a client. The appellation of that package is TEXT_IO, and it likewise contains an entry point named PUT_LINE. occupy the code shown in Listing 1.2, supplant the calls to DBMS_OUTPUT.PUT_LINE with TEXT_IO.PUT_LINE, and you absorb the code shown in Listing 1.6. This code will Run from Procedure Builder.Listing 1.6 A PL/SQL block Using TEXT_IO That Will Run 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 occupy this code and ilk it into Procedure Builder's PL/SQL Interpreter. The interpreter will automatically execute the block when you finish entering the eventual line. The results will study enjoy the following:The variable X = 72600
Procedure Builder has been written specifically to drudgery with PL/SQL. Unlike SQL*Plus, you result not requisite to enter a forward-slash to explicate Procedure Builder that you are done entering a block of PL/SQL.Creating the SS_THRESH Function
Creating a duty (or any other program unit such as a procedure or package) using Procedure Builder requires a bit more than just typing the CREATE duty statement into the interpreter. To create a function, you requisite to explicate Procedure Builder that you want to create a new program unit. result this by selecting the File, New, Program Unit menu option. You will survey the dialog box shown in figure 1.6.
Creating a New Program Unit.
This dialog contains radio buttons allowing you to pick the ilk of program unit that you are creating and likewise contains a textbox for the program unit's name. pick Function, ilk the appellation SS_THRESH into the textbox, and click OK. You will survey a screen similar to that shown in figure 1.7.
Entering the code for SS_THRESH.
Figure 1.7 shows the duty 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 duty in the textbox. You absorb to fill in the details. When you obtain the code entered the pass that you want it, click the Compile button to compile it, and then click the near button to near the window.
To execute the duty 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 duty and panoply the following results:72600 Connecting to a Database
In addition to creating PL/SQL program units on the client, Procedure Builder can likewise breathe used to create and execute program units in a database. To result this, you first requisite to connect to a database. exhaust the File, Connect menu option to connect to a database. Once you've logged in, you will breathe able to browse database program units using the expostulate Navigator. figure 1.8 shows the program units owned by the user named JEFF.
Program units in the JEFF schema.
To create a stored duty or other program unit in the database, supervene 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 pick the schema, the process for creating a PL/SQL duty in the database is the same as for creating one locally.Using SQLPlus Worksheet
If you absorb Enterprise Manager available, account using SQLPlus Worksheet for the examples in this book. SQLPlus Worksheet is completely compatible with SQL*Plus, and can breathe used for consummate the examples in this book. The odds 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 exhaust a text editor-like interface. After you obtain the code entered the pass that you want it, you can click a toolbar button to execute it.Executing a PL/SQL block 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 panoply output. The execute toolbar button, the one with the lightning bolt, is used to execute the statements that you absorb entered in the upper pane.
There are two ways to exhaust SQLPlus Worksheet to execute commands from a file. One pass is to exhaust 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 exhaust the Worksheet, Run Local Script menu option.Summary
In this chapter you erudite a miniature 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 exhaust it to write procedures and functions that execute on the server.
This chapter likewise explains the relationship between PL/SQL, SQL, and SQL*Plus. This should give you a proper grasp of how PL/SQL fits into the larger Oracle picture.
You wrote your first PL/SQL stored function, which should give you a proper feel for the mechanics of programming with PL/SQL.
SQL*Plus is the instrument used throughout this bespeak for PL/SQL code examples. SQLPlus Worksheet and Procedure Builder are two other tools that may likewise breathe used to write and execute PL/SQL code.Q & A
Where does PL/SQL code execution occupy place?
Usually, execution takes Place at the server level. For the examples in this book, that will always breathe the case. Some Oracle products, such as Developer/2000, likewise absorb 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 noiseless 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 survey anything. How come?
You probably forgot to enable the server output option. exhaust 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 obtain errors when I try to execute code that contains calls to dbms_output.put_line(). Why?
When you exhaust Procedure Builder to execute code locally, you must exhaust text_io.put_line rather than dbms_output.put_line(). If you are using Procedure Builder, and you absorb connected to a database, you will breathe able to execute calls to dbms_output.put_line(), but you won't survey the results.
Use the following workshop to test your comprehension of this chapter and save what you've erudite into practice. You'll find the answers to the quiz and exercises in Appendix A, "Answers."Quiz
What tells SQL*Plus to route your PL/SQL code to the Oracle database for execution?
What is the fundamental basis of consummate PL/SQL code?
List an odds of pushing program logic up to the server level.
Name three Oracle products that exhaust PL/SQL.
What command tells SQL*Plus to panoply 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 panoply ERRORS command.
Try each of the three ways mentioned in the chapter for managing your source code. Become close 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. consummate rights reserved.
This article is brought to you by Sams Publishing, publisher of Sams train 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 attend with query creation and execution, user and privilege management, as well as exploration of existing databases. Solution likewise 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 likewise included.Original Press Release: Core Lab Announces the Release of OraDeveloper Studio 2.50
OraDeveloper Studio is a powerful development 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 advocate 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 advocate added.o Oracle Instant Client advocate added.o Date format can now breathe set for the Data Editor.o same file can breathe included several times in the deployment order.o Table columns can now breathe 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 development teamhttp://www.crlab.com/oradev/Related Thomas Industry Update
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As many developers will attest, Oracle's database utilities can breathe difficult to drudgery with. But a new shareware program called PL/SQL may originate it easier to develop and configure apps using Oracle. This product review examines PL/SQL's capabilities.By Stuart Vessels
Wouldn’t it breathe 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 present an app that allows you to panoply 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 figure A, is PL/SQL Developer. It’s produced by Dutch software company Allround Automations.NotePL/SQL Developer will Run 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 development environment that has an impressive assortment of features designed to originate it easier to develop, test, debug, and optimize Oracle PL/SQL-stored program units, such as packages and triggers.
But you don’t absorb to breathe a developer to cherish PL/SQL Developer’s SQL Window. You can exhaust this instrument to panoply the results of any SQL statement in an editable grid, as shown in figure B. Once you edit a territory 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 exhaust this technique to paste new records into a table, or you can paste the data into an transcend or Word file. Of course, there’s a menu command for exporting query results to a variety of Popular file formats, such as transcend 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 facile 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 survey just how powerful this program can be, check out Allround Automations comprehensive features list.
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