The scope is untill the execution of the program where it is defined ends. Progress KB - How to change the current working directory of a 4GL session on Windows? Logical gets two values yes / no or true / false initial value No. Is there a generic term for these trajectories? DEFINE VARIABLE v-cha-work AS CHARACTER NO-UNDO. How will you use more than one for each statement? Q:- Diff b/w PUT, Set, Update and Display? Nor is it a silver bullet. Mfrchk.i to leave the loop when the report is running by using the endkey, Mfreset.i - when this is defined it will reset all the values stored after the iteration is over, Mfnp.i to display the datas from the table for the corresponding when you scroll using arrow keys. DEFINE VARIABLE whand AS HANDLE NO-UNDO. Purchase orders contain a single delivery date for each line item. Why are they still being discussed in any way other than for historical reference? There is no reason to allow for a shared object, especially if you provide guidance for what it is that one does to gain the effect of "shared" without the use of shared. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, +1 because I didn't define my requirements well enough, and for all I know this might work when staying strictly within the AVM. What is this brick with a round back and a stud on the side used for? If you want some code, I can provide itbut based on browsing some of your other questions and answers, I don't expect that you need it :-). After half a year, I began understand the intricacies of working with this server and procedures written in ABL. The update statement let you make changes to the record and progress upgrades the shared-lock to an Exclusive Lock. Shared lock is the default lock used in progress. Application design is part of language instruction, since the how one uses the language implies some sort of inherent application design. You are using an out of date browser. Progress ABL is a programming language tied to the Progress OpenEdge environment, its database and surrounding utilities. If there was a Strunk and White for ABL, there would be a reference point, but that doesn't exist. Making statements based on opinion; back them up with references or personal experience. Yes, A READKEY statement does not have to be the first statement after the word EDITING. PSC has certainly done that with some language elements which were (and are) in wide use and I see no reason why shared shouldn't be added to that list. Using which locks you can update a table? What is that something else that is better? 2) We would certainly like to encourage honest feedback and robust debate on this forum. Of course, that's one of the balancing points of being in the software game. Since I do not have anything except consoles and notebook parsing, certain procedures are more complicated. Learn progress-4gl - Progress ABL is statically typed. Can I use an 11 watt LED bulb in a lamp rated for 8.6 watts maximum? The solution that's been, in my head for awhile is to let users indicate what, things in the syntax they don't want to support, sort. When you pass arguments to an external procedure, Progress converts those arguments to character format. This should always be the default unless transactional control over this variable is a requirement. Means same time other user can not use that db table. In my own defense, if this is necessary, there is, an entire sub-section earlier in the book entitled. C# example: Any code that uses "person.GetName()" will get a compiler warning "Use Name instead". Some people report, it as a critical bug even if we didn't intend to do. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. User without create permission can create a custom object from Managed package using Custom Rest API. Ans: Use these for multiple deliveries of stock items, where an ongoing relationship with the supplier is assumed, but exact delivery dates are yet to be determined. Another factor is that a set of best practice standards is not well established and universally agreed upon. JavaScript is disabled. That this evil may be useful is a separate issue. The length (extent) can be set in run-time. Then again I think that complex GUIs are probably a mistake in the first place. 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. To learn more, see our tips on writing great answers. I've an old desktop application developed in progress 4gl.There is a frame contained in a progress window now my task is to make the frame responsive ie based on the size of its container window the frame should resize dynamically.Is it possible in Progress any workaround will be appreciated.Thanks openedge progress-4gl Share Improve this question I don't see why you need another tool that uses a different parser when the native Progress compiler has the entire and correct context. How to mimic SELECT LIMIT, OFFSET in OpenEdge SQL? The scope remains after the RUN statement executes and it completes until you remove it. Thanks for contributing an answer to Stack Overflow! Ans:- Progress provides you with one buffer for each table that you use in a procedure. I can imagine a file extension that doesn't allow GUI-statements other than tracing. Is there any known 80-bit collision attack? But seriously, OO is an interesting idea that makes some problem domains simpler. Q:- What is the diff between for first and find first? Define Input Parameter, Output Parameter and Input-Output Parameter? Why this "war against shared variables"? Static variables do have their uses, albeit in very restricted cases. Say for INPUT, OUTPUT and INPUT-OUTPUT parameter. I agree that ProRefactor's capablities should be offered -- it's silly to deprecate a feature without an alternative reccomendation. Shared variables have uses too. The STREAM-IO option allows you to redirect the output of a report-generating. 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. Can we use the ACCUMULATE Statement without using blocks? Name the Preprocessor directives. You can use the ACCUMULATE statement only in blocks with the implicit looping property. Progress recompiles the called procedure, substitutes arguments, and then runs the procedure. You can mark your own methods as "obsolete" which either results in a compiler warning or error. DEFINE VARIABLE a AS CHARACTER EXTENT 5 NO-UNDO. What are the different PROGRESS data types? When the procedure is run, the Prompt-For statement puts data into those fields. If yes, Why? folks out there who think they are perfectly OK after all, it is a "traditional Progress programming. "Don't want" is not a requirement I take very. 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. 1. 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. . Copyright document.write(new Date().getFullYear()); Progress Software Corporation and/or its subsidiaries or affiliates. There are a number of places in the book where I try to describe outdated features, while leaving it to others in the company to make formal definitions of what is "deprecated" and what that really means. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. OTOH if you don't think that the list is long enough you can add things to it. What is the use of RECID and ROWID Data type? //A 64-bit integer initialized to -200, DEFINE VARIABLE l AS LOGICAL NO-UNDO. You can use fields () attribute that allows you bring the selected fields of the table. What is Wario dropping at the end of Super Mario Land 2 and why? If your trigger were to PUBLISH the value that you wanted, and you subscribed to it in the appropriate spot in your calling program/class/super procedure, you'd get the info you needed. What's the cheapest way to buy out a sibling's share of our parents house if I have no cash and want to pay less than the appraised value? There are two types of external procedures persistent and non-persistent. What would really be clever would be for PSC to invest in ProRefactor so that it provided a set of rewrite rules for deprecated features. I'm using 10.2B. The underlying record buffer of a field or variable is unaffected. Normalization theory is based on the concepts of normal forms. In above example same time if other user also want to update the same record then other user will not have to wait to release the lock, user2 (progress) will find the no-wait clause and it will go for else part or next line of code. What are types of locks? u can check this by using the ETIME() Function to check the time taken by these two. Did I not indicate that it is very possible to write bad OO code? If you don't set all extents the remaining will get the last set value: Using LIKE you can base the definition of you variable on another variable or a field in a database or temp-table. What are the types of Indexes? Thanks for contributing an answer to Stack Overflow! Shared variables had their uses when procedures didn't allow for passing parameters. But the index starts at 1. There are almost certainly two or three factors involved in things like this persisting in the documentation. Others users can modify the data of the table which is no-locked using exclusive-lock. Or, you can put the value in an SP or singleton. Another factor is that a set of best practice, standards is not well established and universally. While in persistant procedures the values will be retained in the buffers and can be used by any other programs it will be deleted only when the session ends or someone explicitly deletes the values. If some nags were to (finally) be inserted in OE10 we might begin to see some general recognition that, oh say shared variables, are a bad idea by the time version 13 rolls out. INPUT Parameter data moves from the calling procedure to the called procedure, OUTPUT parameter data moves from the called procedure to the calling. Canadian of Polish descent travel to Poland with Canadian passport. 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. Progress ABL is statically typed. Any statements defined before the proper compilation block is called as the preprocessor statements. If you haven't got a Progress session then you can run it from the command prompt with the statement rrojo7229 gave. And in a lot of cases it should be generally possible to largely automate many common code conversion issues. - and you don't want to new up a locator object every time to locate the "Singleton"-instance in the class instance-chain? This yields more efficient code.). Multi-table deadlocks can be avoided by locking the tables in same order in all applications, thus preventing a deadlock condition. Why refined oil is cheaper than cold press oil? 2. 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. One of the, places I see this a lot, and it really drives me nuts, is in, Actuate Basic, which is OO. You can specify "-T c:\temp" in a .pf but not "-T %TEMP%". there is an entire sub-section earlier in the book. NUM-ENTRIES function:- Returns the number of items in a list. This has long been one of PSC's great strengths and the failure of people to keep moving forward has certainly turned into one of PSC's biggest PITAs. Q:- What is the diff between find and can-find? Ans: MRP ignores blanket orders, and receipts cannot be processed against them. Thanks Rrojo, but RUN command is to call it from Progress or Unix ? will include (any day now, we promise, Thomas). The problem is, as long as we do support something, we want to support it consistently. A boy can regenerate, so demons eat him for years. New shared Variable - Defines a variable to be shared by a procedure called directly or indirectly by the current procedure. What is a CIM? The solution that's been in my head for awhile is to let users indicate what things in the syntax they don't want to support, sort of a reverse reserved keyword kind of thing. And so is using include files in lieu of .p's and super procedures. Example #. The value of a global shared variable remains available throughout an OpenEdge session. Primary Index Usually the most frequently used index. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. It gets used when one is ready, willing, and able to fix things that are undesireable without getting in the way of day to day development. Ans:- Progress supports 12 types variable: 12.Blob (open edge-- for saving the images), 13.Clob (open edge-- for saving the images). I agree with you guys on shared variables. //A 64-bit integer initialized to -200, DEFINE VARIABLE l AS LOGICAL NO-UNDO. people who are not out at the leading edge, especially if they are sitting on million line bodies. Returns True value if a record is found that meets the specified find criteria, else it returns false. What is the definition of shared variable? There is no separate definition for shared lock. //A date variable set to todays date. github.com/abevoelker/do/tree/add-openedge-adapter/do_openedge, How a top-ranked engineering school reimagined CS curriculum (Ep. I know I didn't read the entire book, and I have no intention of doing so since I was only looking for specific material I need to figure out. I don't think it's reasonable to expect a developer to read the entire handbook when they're looking for information on one language element. The SEARCH function returns the full pathname of. Will look for the string "shared var" in any case in all *.p files. I think shared anything should go away as a dangerous, outdated technique. Assign moves the data from screen buffer to record buffer. Which was the first Sci-Fi story to predict obnoxious "robo calls"? DEFINE VARIABLE . I'd make the same translation here. What a PITA. For what domains is it better? Making statements based on opinion; back them up with references or personal experience. Asking for help, clarification, or responding to other answers. It might be used as a facile excuse but it isn't the real reason. Progress automatically supplies looping services to REPEAT and FOR EACH blocks. How are engines numbered on Starship and Super Heavy? What are the different types of blocks available in progress? Q:- What is difference between STREAM , OUTPUT TO, and OUTPUT TO VALUE? I think that Sal is proposing a reasonable compromise. Ans:- PUT - is used to send/display the data except on terminal like printer, fax, any file etc. 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. You can always use operating system utilities like grep. Procedure is the largest Progress unit of execution, consisting of one or more Progress source or r-code statements in a single, outer block. 6. 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. What is the difference between find first and for each statement? I agree with you that it is an important goal, but I also recognize that it is not an easy one. PROGRESS supports 2 types of database triggers: Always execute when a specified event occurs, regardless of what application initiates the event. What is the difference between LIKE and AS while defining a variable? What will you write in the CIM program to specify F1, F4 key, Enter and for Default option? Yes, it is a workaround, but it is a workaround that works! It can be done using the extent statement during the variable declaration. SYNTAX:- NUM-ENTRIES ( list [ , character ] ). Folder's list view has different sized fonts in different folders. So without further ado, the code: Now, I don't know if this does you any good, since you can't probably interfere with behavior at will. If one is making minor tweaks, there is a strong tendancy to just leave things as they are. Do any of these relate to a domain where one would be writing ABL code of any form? Suppose u have a database and that database is used by 100 client and user1 want to update the table with 100 fields. Database trigger - Also known as a schema trigger, a block of 4GL code that executes whenever a specific database event occurs such as creating or deleting a table, assigning a value to a field, and so on. I'm not running any ABL code at all, it's all Ruby and Java (using JRuby; a Ruby interpreter running on the JVM). So maybe we should be documenting "worst practices" instead of "best practices"? To learn more, see our tips on writing great answers. Boy, you step out of the room for a minute (well, to, Greece and back and various other places) and all. To learn more, see our tips on writing great answers. rev2023.5.1.43405. Archive of former Progress Community Discussions, 10.1A Progress 4GL Handbook, by John Sadd and Shared Variab. Date any common dates Initial value - ? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. For instance, DEFINE [NEW ] DATASET and the like? It can be done by defining the variable as the shared variable. This acts the same way the data entered manually with all the validations put in the program. Unexpected uint64 behaviour 0xFFFF'FFFF'FFFF'FFFF - 1 = 0? Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, how to replace all the email id records with progress 4gl, Progress 4gl, Openedge Update Progress.ini in all users, Progress 4GL: How to find where a procedure is defined. More correctly, I think it is "Static variables get, used", but where are they a better solution than a. Since session triggers are executed from within an enclosing procedure, they have access to the frames, widgets, and variables defined in the enclosing procedure. Share-Lock(default lock, other user can read but not update), Exclusive-lock (other cannot read and update). language, and (b) update the docs to point them in that direction. If field is set from expression, field can include all of the elements that are defined for the . But I would just like to mention a few things: 1) We are listening. if data is exist then it returns TRUE otherwise it returns, Q:- What is the diff bet a function and a procedure, Ans:- 1. function can return the value through the return keyword,but procedure can't return the value. Before the Compiler analyzes your source code and creates r-code, the preprocessor examines your source code and performs text substitutions.You control the preprocessor by placing preprocessor directives throughout your source code. If you do not use the BY option, PRESELECT sorts the records in order by the index used to extract the records. It may not display this or other websites correctly. What is the difference between Procedures and Functions? What is deadlock? Can we pass an include file as an argument to another include file? Progress KB - SESSION:TEMP-DIRECTORY does not change when Windows current directory is changed with Win32 API call But not recommended, and as Rob and Tom have said a resourceful user could work it out. Making statements based on opinion; back them up with references or personal experience. progress-4gl Tutorial => Variables Variables Fastest Entity Framework Extensions Bulk Insert Bulk Delete Bulk Update Bulk Merge Introduction # Progress ABL is statically typed. Take for example, PROMPT-FOR which as I understand is also being deprecated. DEFINE VARIABLE v-int-work AS INTEGER NO-UNDO. If you need to share buffers among procedures, use the DEFINE SHARED BUFFER statement. Yes, I think the original question is asking about passing parameters into a start-up command line. There is plenty of room for both solutions. Recently, figuring in a long chain of procedures, I had a question: Over and over and over again I see, Actuate developers define global variables in order to pass some, information from one context to another when it is quite possible, to pass this info in a good OO way by having the objects, interrogate their context. Because they're an insidious cancer in an application's development that should be replaced by other, newer and safer methods of sharing information between procedures, rather than being touted as a plausible option for an unwitting developer to use. OUTPUT PARAMETER - Defines a parameter that returns a value to one of the following destinations: If the calling procedure runs the current (called) procedure synchronously, the value is returned to the corresponding OUTPUT parameter of the RUN statement in the calling procedure. Prompt-for moves the user input to the screen buffer. How will you declare the variable that is to be used in more than one programs? [Stackoverflow] [Progress OpenEdge ABL] Optional Input Parameters in Procedures/Apps, Stackoverflow tagged OpenEdge or Progress-4GL/DB, [Stackoverflow] [Progress OpenEdge ABL] Could not find the entrypoint _pcre2_compile@40. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. BEGINS uses an index wherever possible. Then one gets the warning when one is ready to do something about it. An Include file is a separate file containing progress code that you can call from other procedures by placing the filename in braces within the procedure. You have no argument that it is not a silver bullet. The iteration can also be stopped by using next statement. We have ProLint for telling us things like the use of deprecated features. They may not be running fully-leading-edge code, but if they're running 10.1 systems, the runtime is leading edge, which means they can use newer, better ways of doing thing. The compiler already throws non-fatal warnings. To change things after the frame has been displayed you will basically need to build a new frame to replace the old one. What will be the lock when we read the record and update the record? This behavior supports recursive procedures and bill-of-materials applications. database. If an application with several procedures defines a NEW SHARED variable with the same name in each procedure, Progress creates a different instance of the NEW SHARED variable in each procedure. 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). For is a progress block and find is a progress statement. It's a lot of work. Can-find is used only for data existence. A character longer than 32K should be a longchar */ DEFINE . If you're writing instructions on how historical language elements worked, were used, and their general design techniques - that's fine. Transaction warnings are pretty common and you don't "have" to fix them any more than you "have" to fix a shared variable. What are the different types of Blocks? on how to make old code and new code work together, something which I think is a bit weak in the current, But, there also should be good guidance in best, practices with new features (and what not to use. DEFINE VARIABLE a AS CHARACTER EXTENT 5 NO-UNDO. No. Now remember: All fields will have to be manually repositioned inside the frame. VIEW - Displays a widget (sets its VISIBLE attribute to TRUE). However - something as outdated as shared variables should be termed "obsolete", "legacy" or something to convey that it's an old way of doing thins. Ans:- The preprocessor is a component of the Progress Compiler. But how are you going to find this singleton object when: - there is no "static" specifier in the OO4GL (there is no "METHOD PUBLIC STATIC " nor a "STATIC CLASS " as far as I know). A transaction is a set of changes to the database, which the system either completes or discards, leaving no modification to the database. (Could be thought somehow as the 'reverse' to the existing keyword forget list). Of course, that's one of the balancing points of, being in the software game. A Block is a series of 4GL statements grouped together and treated as a single unit. It is a block of code defined within an external procedure that you can execute by name within the context of the containing external procedures. Ans:- Transaction is a set code which completely done the program or completely undone the program. Doing so makes it clear where it. Why would you use PUT instead of DISPALY? It would cause people, with some code bases to avoid upgrading and it would, break a lot of automated build processes. But, I'm not arguing that PSC shouldn't enhance their tool set, I'm just arguing that I don't want mandatory nagging in the compiler. If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? I truly appreciate the time and work you put into sharing your knowledge. You can also get some basic help from the compiler (assuming you have a development license of some kind). The other use of temp-table is u can assign the data from single temp-table to multiple database tables at on shot. How much RAM does my database and processes use. If you need more than one record at a time from a table, you can use the DEFINE BUFFER statement to define additional buffers for that table. provide an immediate value for the PK themselves, provide a sequence that corresponds to the table that they are updating. 2. Why did US v. Assange skip the court of appeal? If you need more than one record at a time from a table, you can use the DEFINE BUFFER statement to define additional buffers for that table. Accessing a new global variable that's tucked away somewhere is also a workaround that works. it provides no upgrade path to a better implementation in the, future when it becomes available and in the meantime it provides a. You must log in or register to reply here. What is an Include file? I'm always a fan of showing more options and explaining why one would make choices, but the specific example this thread started with is definitely a best practices issue well, or a worst practices issue. My point is that we have a perfectly good tool, ProLint to do this kind of warning. What it will be when updated and during other times? I can go with that a few releases, but sooner or later the docs need to be gone over, updated, and cleaned up. For example, a reference to {{1}} in an include file causes Progress to include the statements from the file with the name that passed as the first argument. As, it is certain features that are prone to mis-use, (such as shared variables, CAN-DO and USE-INDEX) are, far too prominently featured in the documentation, and, in many cases, are held up as exemplars when. You cannot precompile a procedure to which you pass arguments. NO-UNDO variables are efficient; use this option whenever possible. It is the most basic procedure, which can contain a single 4GL statement, many statements, or it can be an empty file. Brooks proved that there are none of those to be had 20 years ago. Progress allows you to set one index as primary and uses it by default when retrieving or ordering records. You will have to look into converting it to fit your form. 5. No Lock allows you to read the table only and does not allow you to modify it. Oh, you mean like all of the OERA code examples? For is a progress block and find is a progress statement. Can I use the spell Immovable Object to create a castle which floats above the clouds? The variables need to be declared and the datatype cannot be changed during run time. For Starship, using B9 and later, how will separation work if the Hydrualic Power Units are no longer needed for the TVC System? How about using PUBLISH and SUBSCRIBE? You are using an out of date browser. Is there any way to store a session variable in OpenEdge SQL similar to how Oracle's RETURNING INTO clause works? But, when some more fundemental work needs doing, there is no reason not to encourage people to shift to more modern techniques, thus at least improving one little corner of the application. For a better experience, please enable JavaScript in your browser before proceeding. What will UNFORMATTED option do in the PUT Statement? For Starship, using B9 and later, how will separation work if the Hydrualic Power Units are no longer needed for the TVC System? "Traditional" ways of doing things need to be replaced when better ways of, And the best way to do that is to (a) make it easy for them to do so in the. This modified text is an extract of the original. Were this "feature" added, I would have to read through these nag messages with every compile to make sure that there were no real errors lurking. In above example if u doesnt mention the NO-WAIT clause and mean while if user1 has gone for some other work/tea, then user2 will hit the database every time to update the record, means progress will not move the next line of code until it will not get the release of exclusive-lock. It is easy to be dismissive but it would be more useful to be clear about what exceptions or qualifications you are making. Brief about LOOKUP function? Can I use an 11 watt LED bulb in a lamp rated for 8.6 watts maximum? Theoretical Design/Maintainability/etc. Defined as part of an application and are only in effect for that application. where I try to describe outdated features, while leaving it to others in the company, to make formal definitions of what is "deprecated". Yes, there are. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA.
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