- 7. Mai 2023
- Posted by:
- Category: Allgemein
Thanks for contributing an answer to Stack Overflow! What is Wario dropping at the end of Super Mario Land 2 and why? What is the difference between Find first and For First Statement? What are the different PROGRESS data types? We all understand why PSC has chosen to support historical syntax in later versions. If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? Can we run an internal procedure with the persistent option? CREATE FRAME whand. The compiler should be silent unless there is something fatal or a good reason to expect that the code will not perform as intended (like moving colon position). But obsolete if not dangerous techniques shouldn't be listed as examples of how to work with the product's current technology when there are better and safer ways to accomplish the same thing. I wonder why we have to persuade you all the time, I would rather persuade PSC Based on my experience with OEA, the parser behind ProLint is better than the one PSC is using although they really aren't trying to do the same thing. And, clearly they should be provided with guidance. Trusting execution of code that ensures database integrity to the client's runtime seems very insecure to me, but what do I know (never drank the OE Kool-Aid). What is the difference between Temp-Table and Work-Table? ', referring to the nuclear power plant in Ignalina, mean? What is a CIM? Display - is used for take the data from record buffer to screen buffer, means display the data on screen. What is an Include file? Take for example, PROMPT-FOR which as I understand is also being deprecated. The underlying record buffer of a field or variable is unaffected. :-). Your context class needs to be instantiated before it can find the "implementation object" by walking the object chain. The use-index option of the record phrase allows you to choose the defined index by which you want to access the selected records. 2. Procedures can use shared variables and other mechanisms to share data between. Identifies the process that follows each keystroke during a PROMPT-FOR, SET, or UPDATE statement. Of course, that's one of the balancing points of, being in the software game. A transaction is a set of changes to the database, which the system either completes or discards, leaving no modification to the database. progress-4gl Tutorial => Variables rev2023.5.1.43405. In that section you spend most of your time on global shared and the arguments against regular shared seem to boil down to: 1) If you are using some structures of persistent procedures, you can't use shared because there is no shared context; 3) If the procedures are spread across more than one machine, it isn't possible to use shared. The calling procedures temp table and the called procedures temp table need not have matching indexes. To change things after the frame has been displayed you will basically need to build a new frame to replace the old one. Means same time other user can not use that db table. This modified text is an extract of the original. What is the default lock? MATCHES does not use index information when performing a comparison; it always scans the entire data table. If your window hasn't been set as RESIZE, then there's really no luck. Ans:- PUT - is used to send/display the data except on terminal like printer, fax, any file etc. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. I personally don't get hung up and worry about "best practice" - there's lots different ways to skin a cat, depending on the variations of what a coder's trying to accomplish, personal quirks, etc. Such as using shared variables / temp-tables as an example of procedural programming in the new OO intro docs translation here. Here's the problem, i need to create a date range on the variable below. 3. Explain the functionality? There are two types of frames: down and one-down. If you haven't got a Progress session then you can run it from the command prompt with the statement rrojo7229 gave. Making statements based on opinion; back them up with references or personal experience. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. What is one, circumstance where a shared variable is superior to a, parameter other than in a version of Progress, where there were no parameters, which is a silly. Persistent Procedure creates it context when it executes and then maintains it context after it runs until the end of the progress session, or until it explicitly deleted. It's true that certain vendors got (very) carried away with them 20 years ago and set some horrible examples that live on to this day inspiring bad programmers to be even worse but doesn't mean that they should be reviled in quite the same way that USE-INDEX and CAN-DO deserve to be. there is an entire sub-section earlier in the book. This should always be the default unless transactional control over this variable is a requirement. I would submit that whenever old language elements are described, something needs to be included saying they're old / historical and references made to other techniques which provide better / safer ways of accomplishing the same thing. The "%TEMP%" will be taken as a literal path; it won't be expanded by the shell.. For Windows you could try SetCurrentDirectory: This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. We cannot use it in where clause, doing so generates error. It may not display this or other websites correctly. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. If it does then those processes deserve to break. PROGRESS gives you the ability to deploy your applications across a wide range of platforms and configurations -- host-based and client/server environments, open and proprietary systems, and character and graphical interfaces -- without changing the application logic. progress 4gl - OpenEdge SQL: 'variable' feature similar to Oracle PL That's not true, since you have instantiated and deleted this context object all over your code! Making statements based on opinion; back them up with references or personal experience. Sends the value of one or more expressions to an output destination other than the terminal. Q:- Progress Creates how many file at the time of database creation? I think developers would like a more expressive grammar for new code constructs like the OO-environment instead of disabling keywords. SYNTAX:- R-INDEX ( source , target [ , starting ] ). I think that Sal is proposing a reasonable compromise. Oracle 11g SQL - DD/MON/YYYY to MONTH DD, YYYY with WHERE month year clause, How to Extract Year from DATE in POSTGRESQL, Hello how can i joint table in progress 4gl? MRP treats purchase order items as supply, and assumes that ordered amounts will be available on the delivery date. By using the temp table we can reduce the network traffic on server to DB. Oh, you mean like all of the OERA code examples? My point is that we have a perfectly good tool, ProLint to do this kind of warning. If going-way-back developers want to use them fine, but they should be moving to other technologies. Normalization is essentially a two step process. To learn more, see our tips on writing great answers. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. What is the definition of shared variable? You will have to look into converting it to fit your form. Prompt-for moves the user input to the screen buffer. The mis-use is what makes them evil, not their existence. NUM-ENTRIES function:- Returns the number of items in a list. Progress automatically puts a SHARE-LOCK on a record when it is read and automatically puts an EXCLUSIVE-LOCK on a record when it is updated. A character longer than 32K should be a longchar */ DEFINE . OO has a place but it isn't the be all and, Well now that you've reduced it to a religious question I guess there's no need to be rational. Can we use the ACCUMULATE Statement without using blocks? Progress recompiles the called procedure, substitutes arguments, and then runs the procedure. Defines or forward declares a user-defined function. Interpreting non-statistically significant results: Do we have "no evidence" or "insufficient evidence" to reject the null? Progress, Telerik, Ipswitch and certain product names used herein are trademarks or registered trademarks of Progress Software Corporation and/or one of its subsidiaries or affiliates in the U.S. and/or other countries. Continuing the "Shared" thread - why is the "shared" concept being carried forward with new language elements? Returns the integer key code of the most recent event read from the user (that is, from the keyboard or mouse) during an interaction with a procedure. A preprocessor directive is a statement that begins with an ampersand (&) and is meaningful only to the preprocessor. Good practice should be emphasized and less good practice relegated to the "notes" section or at least given less prominent billing. progress-4gl Tutorial => Basic variable declarations If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? [ PRIVATE | PROTECTED | PUBLIC ] VARIABLE variable-name. To you and I and a bunch of other people, shared variables are anathema, but there are still a lot of folks out there who think they are perfectly OK after all, it a "traditional Progress programming technique". Yes, there are. provide an immediate value for the PK themselves, provide a sequence that corresponds to the table that they are updating. Progress automatically supplies looping services to REPEAT and FOR EACH blocks. So best programming practice is that whenever use the exclusive-lock also use the no-wait. There should be a number of different examples showing different ways to accomplish a given goal, with a description of each one's strengths and shortcomings. All rights reserved. people who are not out at the leading edge, especially if they are sitting on million line bodies. Using code similar to the following: DEFINE VARIABLE v-cha-usr-tempdir AS CHARACTER NO-UNDO. 2. Load data through online maintenance programs. It allows you to modularize your code and reduce the number of external files in an application. What are types of locks? What is a trigger and what are the different types of triggers? Now that parameters can be passed, the need for SV's no longer exists in new code. Learn progress-4gl - Progress ABL is statically typed. Thanks for contributing an answer to Stack Overflow! What will return if search does not find the file? A progres 4GL procedure you can execute with run withina progress session and is normally not saved in the database. I was asked to administer the server progress 10.2B on SLES and software system written on it. for first displays data without sorting while find first display data after sorting,So the for first is more efficient in terms of time taken for displaying the record as compared to find first. What is the difference between LIKE and AS while defining a variable? Or, maybe it comes of having not, really tried One would have thought that I was the one old. A minor scale definition: am I missing something? When you prompt for information or display information for the user, Progress places that information in the screen buffer. When the procedure is run, the Prompt-For statement puts data into those fields. disadvantages weren't sufficiently emphasized. Why did US v. Assange skip the court of appeal? Q:- Progress supports how many types of variable? /* A handle is a handle to anything: a session, an on screen widget etc */ /* A Com-handle is used for ActiveX Com-automation */ DEFINE VARIABLE h AS HANDLE NO-UNDO. A constant, field name, variable name, or expression that you want to pass as a compile-time argument to the external procedure you are running. Progress has the ability to use and understand SQL, but the overwhelming majority of application development is done using the native 4GL, which is held in high regard because it gives programmers the power that SQL has historically lacked, and that products like Oracle's PL/SQL and Power builders Transact/SQL attempt to provide with varying degrees of success. I find it very difficult to believe that the overhead of the run itself doesn't swamp out the overhead associated with a parameter versus a shared variable. The "Evil-ness" of something isn't necessarily about their existence, but how they're used or are abused in order to (wrongly) accomplish a particular goal. OO has a place but it isn't the be all and end all. Other languages provide equivalent constructs with the "static" keyword for session wide, global variables and "ThreadLocal" or "thread static . Other methods (like "choose") have been deprecated by PSC, but nothing's been suggested to replace it. What is the default lock? In my own defense, if this is necessary, there is an entire sub-section earlier in the book entitled "Why you generally shouldn't use shared variables", which tries to balance the "traditional" (if you'll pardon the expression) use of shared variables and more modern ABL programming techniques. Q:- What is the diff between for first and find first? an SP or singleton object designed to provide such values and, simply retrieve it as necessary. of a reverse reserved keyword kind of thing. So you asked for an example to streamline code: you gave the example yourself "Don't want" is not a requirement I take very seriously. Archive of former Progress Community Discussions, 10.1A Progress 4GL Handbook, by John Sadd and Shared Variab. //A 64-bit integer initialized to -200, DEFINE VARIABLE l AS LOGICAL NO-UNDO. Thanks Rrojo, but RUN command is to call it from Progress or Unix ? //An character array with length = 5, DEFINE VARIABLE j AS INTEGER EXTENT NO-UNDO. Asking for help, clarification, or responding to other answers. You can use this pointer to: Position to and retrieve a record from a results list. There are a few areas where OO might be worth giving consideration to if the Progress implementation goes in good directions (such as the excellent decision to implement simple accessor syntax). What is can-find function? You can always use operating system utilities like grep. If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? If you're writing instructions on how historical language elements worked, were used, and their general design techniques - that's fine.
