This, to me, is one of the very interesting challenges facing PSC. Normalization is essentially a two step process. Mfhead.i to display the header in the report containing page nos and date. Other languages provide equivalent constructs with the "static" keyword for session wide, global variables and "ThreadLocal" or "thread static" variables for thread-scoped variables. Procedure is the largest Progress unit of execution, consisting of one or more Progress source or r-code statements in a single, outer block. progress 4gl - OpenEdge SQL: 'variable' feature similar to Oracle PL 4. who remain running on older releases. Load data through online maintenance programs. User without create permission can create a custom object from Managed package using Custom Rest API. Defines or forward declares a user-defined function. You can mark your own methods as "obsolete" which either results in a compiler warning or error. Unique Index - An indexed field where every index key must be different. DEFINE VARIABLE statement - Progress.com Supporting a structure because one knows that it is in wide use doesn't mean that one can't also designate it as deprecated. 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. Why, in the docs used to describe cutting-edge ABL technology, is shared variables mentioned front-and center, when it should be relegated to "other mechanisms"? There is no such feature and no viable workarounds. At the very least, it would seem that one would need a run statement in a loop with many iterations and, of course, this would first imply the use of a persistent procedure so that the run is a run of an IP and any fixed parameters were set once outside the loop. Ans:- Progress provides you with one buffer for each table that you use in a procedure. To learn more, see our tips on writing great answers. If you use shared lock it will upgrade to exclusive lock automatically if update is given. This modified text is an extract of the original. Making statements based on opinion; back them up with references or personal experience. However, they should be labled as such and pointers provided to current languange elements and techniques that should be followed. Where does the version of Hamapil that is different from the Gemara come from? The documentation (http://www.psdn.com/library/entry.jspa?externalID=437&categoryID=261) by the way states: You cannot define a NEW SHARED or NEW GLOBAL SHARED variable in a class. So best programming practice is that whenever use the exclusive-lock also use the no-wait. Did I not indicate that it is very possible to write bad OO code? Defined as part of an application and are only in effect for that application. Progress Documentation Progress allows you to set one index as primary and uses it by default when retrieving or ordering records. What is the difference between LIKE and AS while defining a variable? SYNTAX -- LOOKUP ( expression , list [ , character ] ). Widget types are starting with windows. What is a Query? Progress ABL is statically typed. ENABLE Enables input for one or more field-level and child frame widgets within a frame. Your context class needs to be instantiated before it can find the "implementation object" by walking the object chain. database. where I try to describe outdated features, while leaving it to others in the company, to make formal definitions of what is "deprecated". DEFINE VARIABLE dt AS DATE INTIAL TODAY NO-UNDO. Yes, A READKEY statement does not have to be the first statement after the word EDITING. Find centralized, trusted content and collaborate around the technologies you use most. Can-do function :- Checks a string value against two types of comma-separated lists: An ID list of one or more user permission strings that indicate what users have access to the current procedure. Nor is it a silver bullet. But only once! Why don't we use the 7805 for car phone chargers? But the default should be "full nagging". Progress ABL is statically typed. By Defining the OUTPUT TO you can send the data to predefined file name and only one destination at a time. Primary Index Usually the most frequently used index. 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. 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. And in a lot of cases it should be generally possible to largely automate many common code conversion issues. 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". How do you sort records with the use-index option? All validation used in these programs during normal data entry is available during a CIM load. But the index starts at 1. But seriously, OO is an interesting idea that makes some problem domains simpler. NUM-ENTRIES function:- Returns the number of items in a list. This is the default external Procedure. Yes, there are. To you and I and a bunch of other people, shared, variables are anathema, but there are still a lot of. rev2023.5.1.43405. 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. An infeasible workaround is to construct a special stored procedure specifically for performing the INSERT(s), but that is not a general solution as the INSERT command takes a variable number of parameters (not least of which is which columns and data to populate with), while the stored procedure must have a fixed number of parameters. 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). How can I control PNP and NPN transistors together from one pin? 3. SYNTAX:- NUM-ENTRIES ( list [ , character ] ). I'll assume you don't own the source code. I have included the following enhancement in the list of candidates for the next feature release after 10.1B (as I said in another posting, the release has not been signed off so I cannot give you more details yet): Compiler enhancement to allow ABL developers to list what the compiler should be generating warnings about. Of course, that's one of the balancing points of, being in the software game. The reference I related described shared variable programming as "traditional", not "historical". R-index function:- Returns an integer that indicates the position of the target string within the source string. Myself, I think having the compiler throw non-fatal warnings would be a bad idea. What will UNFORMATTED option do in the PUT Statement? I truly appreciate the time and work you put into sharing your knowledge. It might be used as a facile excuse but it isn't the real reason. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, How to make an existing frame responsive in Openedge,progress 4gl, How a top-ranked engineering school reimagined CS curriculum (Ep. To be sure, there are lots of us out here with legacy apps filled with shared variables. It returns 0 if the expression is not in the list. Mfrtrail.i to display the footer in the report with the name of user who created the report input variables etc. I can imagine a file extension that doesn't allow GUI-statements other than tracing. It will be upgraded to Exclusive lock when data is updated. That states that no undo handling is wanted for this specific variable in case of a transactional roll-back. 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. .lg (time of database up and shut down). If someone on the outside were to go through and make a list of all the bad examples, then it might be manageable to respond to those, but fixing them internally means that someone has to do the scan who would recognize a bad example. Parabolic, suborbital and ballistic trajectories all follow elliptic paths. It is important to continue to support existing code, at least for a significant period. " You cannot define a NEW SHARED or NEW GLOBAL SHARED variable in a class definition (.cls) file.". Once the frame has been "realized" you cannot change its height or width. Brief about LOOKUP function? Thanks for contributing an answer to Stack Overflow! More correctly, I think it is "Static variables get, used", but where are they a better solution than a. Defines and identifies a variable that can be used by any procedure that names that variable using the DEFINE SHARED VARIABLE statement. Index A directory or table is containing the field or fields identifying the records in a table, and the locations where the records are stored. //An extent without a set length, DEFINE VARIABLE b AS DATETIME LABEL "Departure time". In can-find u can't manipulate the data, but in find u can with exclusive lock. What are the arguments for/against anonymous authorship of the Gospels. Continuing the "Shared" thread - why is the "shared" concept being carried forward with new language elements? Ans:- 1. find is a statement and can-find is a function. I suppose that all evil things have their uses, but that doesn't make them good. To learn more, see our tips on writing great answers. I'd like to see better guidance in how to easily do things now that used to be rather difficult to accomplish in prior versions. This acts the same way the data entered manually with all the validations put in the program. &GLOBAL DEFINE and &SCOPED DEFINE directives allows you to define preprocessor names, which are compile time constants. INPUT Parameter data moves from the calling procedure to the called procedure, OUTPUT parameter data moves from the called procedure to the calling. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. Archive of former Progress Community Discussions, 10.1A Progress 4GL Handbook, by John Sadd and Shared Variab. is there such a thing as "right to be heard"? There are currently five normal forms that have been defined. MIP Model with relaxed integer constraints takes longer to solve than normal model, why? people who are not out at the leading edge, especially if they are sitting on million line bodies. 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. Thank you very much for sharing. Users should be encouraged to move to more recent, better ways of doing things rather than perpetuating older, obsolete techniques. However, in my case the only communication I have with OpenEdge is through the JDBC driver to the SQL-92 engine. Searches the directories and libraries defined in the PROPATH environment variable for a file. The value of a global shared variable remains available throughout a Progress session. For any given release, there is, substantial work required to update and add new, documentation to cover new features, so it is not, surprising that there isn't a lot of resources, available for going back to material that hasn't. If the calling procedure runs the current (called) procedure as an asynchronous remote procedure, the value is returned to the corresponding INPUT parameter of the event procedure specified to handle the PROCEDURE COMPLETE event for the current procedure. Otherwise the table will be released only after the end of the block. 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. A progres 4GL procedure you can execute with run withina progress session and is normally not saved in the database. 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. For is a progress block and find is a progress statement. Progress Documentation What I like about this pseudo-singleton approach is that it is usable as of 10.1A, but when we get true singletons later, one can simply collapse the action code into the finder and all the rest of the code is likely to remain the same. The update statement let you make changes to the record and progress upgrades the shared-lock to an Exclusive Lock. Any statements defined before the proper compilation block is called as the preprocessor statements. Stackoverflow tagged OpenEdge or Progress-4GL/DB, Occasionally encounter error 5890 and 5884 with excel com-object, [Stackoverflow] [Progress OpenEdge ABL] Sometimes having error with CSV output file from 4GL program, [Stackoverflow] [Progress OpenEdge ABL] How to use the OpenEdge debugger (OpenEdge Debugger 11.6). I can understand existing "shared" support remaining in the language, but adding support for shared "stuff" in new technology like PDS??? Q:- Progress supports how many types of variable? Progress KB - How to change the current working directory of a 4GL session on Windows? "Don't want" is not a requirement I take very. We cannot compile an include file. 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. 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 QC Ok then Make APV otherwise Purchase Return. I know that PSC feels it necessary to "comfort" people who are used to procedural code that it is still a valid paradigm, but that doesn't mean that every verb or modifier needs to be called good. If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? OO has a place but it isn't the be all and end all. If it isn't put even more strongly, it's because the book was trying to strike a balance between material for those who may be maintaining older applications and those trying to create new ones. Progress KB - SESSION:TEMP-DIRECTORY does not change when Windows current directory is changed with Win32 API call. is there any possibility to find out what variables, global variables, shared variables are defined at a particular point of performing a certain procedure? How to find all the defined variables in Progress-4gl? No. 1. ANS:- By Defining the STREAM you can send the data(output) to more than one destination at a time by single stream name. If it does then those processes deserve to break. . Are these even meaningful? When I pass Temp table as parameters, what are the rules apply to Temp table parameters? - ERS 1016 -, I almost suggested that! You must log in or register to reply here. 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. Ans:- FIND FIRST pp EXCLUSIVE-LOCK NO-WAIT NO-ERROR. 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. When you pass arguments to an external procedure, Progress converts those arguments to character format. 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. It does not make record available to the procedure. What is the difference between Persistent and Non-Persistent Procedures? //A 64-bit integer initialized to -200, DEFINE VARIABLE l AS LOGICAL NO-UNDO. put even more strongly, it's because the book was, trying to strike a balance between material for those, who may be maintaining older applications and those, There are a number of places in the book. 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. It strikes me as a way of being presented with a solution and then denying it by defining it out of existence. If an error is encountered during the execution of the loop, it will help to come out of the loop by setting Batchrun parameter to Yes. See Trademarks for appropriate markings. Since they want to incorporate those people, there is a pattern of saying that one can use OO or not use OO, one can use PDS or one can not use PDS, etc. Ans: MRP ignores blanket orders, and receipts cannot be processed against them. Word Index - An index that contains all the words from a text field or array of text fields so you can search for records containing specific words or phrases. Using Comma(,) we can define more than for each statement. Logical gets two values yes / no or true / false initial value No. Please give a brief about no-undo and undo option. 2) We would certainly like to encourage honest feedback and robust debate on this forum. e.g. A single external procedure (.p or .w) can contain any number of internal procedures. Explain the functionality? A transaction is a set of changes to the database, which the system either completes or discards, leaving no modification to the database. You also might want to set session:suppress-warnings to YES before you get this running, because every time a widget doesn't fit the frame, OpenEdge will let you know about it. progress-4gl Tutorial => Getting started with progress-4gl Boy, you step out of the room for a minute (well, to Greece and back and various other places) and all hell breaks loose. The length (extent) can be set in run-time. Is "I didn't think it was serious" usually a good defence against "duty to rescue"? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. If you do not use the BY option, PRESELECT sorts the records in order by the index used to extract the records. 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. Can we use it in the where clause? Yes, and one can make a good case that static variables are also evil and are bad OO. For first can use multiple indexes and Find cab use only one index. 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. A few personal snips here and few loose words there can not only degenerate the discussion but it can discourage others from joining in and offering their thoughts and we would like to hear from everybody in the community. DEFINE VARIABLE i AS INT64 INITIAL -200 NO-UNDO. Recently, figuring in a long chain of procedures, I had a question: All rights reserved. It's not reasonable to expect current developers to read all of a reference book's contents every time a new version comes out or they're looking for help with one particular language element. By Defining the OUTPUT TO VALUE you can send the data to dynamically change the file name and only single destination at a time. It would cause people with some code bases to avoid upgrading and it would break a lot of automated build processes. Which was the first Sci-Fi story to predict obnoxious "robo calls"? It can be done using the extent statement during the variable declaration. DEFINE VARIABLE v-cha-work AS CHARACTER NO-UNDO. And, another factor I think is that PSC seems to be very conscious of the fact that there are a lot of people who are not out at the leading edge, especially if they are sitting on million line bodies of existing code. VIEW - Displays a widget (sets its VISIBLE attribute to TRUE). For a better experience, please enable JavaScript in your browser before proceeding. 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. progress-4gl Tutorial => Basic variable declarations Screen Buffer:- to display the data on screen from record buffer. 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. NO-UNDO variables are efficient; use this option whenever possible. Normalization theory is based on the concepts of normal forms. //A logical variable named l. DEFINE VARIABLE c AS CHARACTER NO-UNDO CASE-SENSITIVE. Check the threads in OpenEdge Development - Forum or navigate to the new Progress Community. of a reverse reserved keyword kind of thing. Can we define the same NEW SHARED variable in Multiple Procedures? The called procedure must name the same variable in a DEFINE SHARED VARIABLE statement. If your window hasn't been set as RESIZE, then there's really no luck. Also, though the book came out with the OE10 doc set, it was in fact written to Version 9, and as such has had to be updated in various ways (such as the follow-on ProDataSet book) and other materials (yet to come, in some cases). will include (any day now, we promise, Thomas). ENTRY - Returns a character string entry from a list based on an integer position. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The maximum size is 28000. What is preprocessor directive? LIKE option - Indicates the name of the variable, database field, temporary table field, or work-table field whose characteristics you want to use for the variable you are defining. What is this brick with a round back and a stud on the side used for? https://www.tutorialspoint.com/selenium/selenium_tutorial.pdf. One is that a lot of the documentation was written a, long time ago when awareness of some best practice, standards was not nearly as widely understood as it, is today not that they are universally understood, even now. A .pf is a collection of client startup parameters that you invoke collectively with the -pf startup parameter on your client's command line. 5. ANS:- 1.Lookup Function - Returns an integer giving the position of an expression in a list. Q:- What is the use of defining the EXCLUSIVE-LOCK with NO-WAIT. Supplier schedules specify dates and even hours of delivery for the near term, and inform MRP and the supplier about long-term plans. ANS:- Progress Creates 5 log files at the time of database creation-, 3. With a true singleton, you don't have to instantiate the context class, but you would provide a "LoginContext.Current" property. What is Wario dropping at the end of Super Mario Land 2 and why? Update - is the combination of Display + Prompt-for + Assign. BEGINS uses an index wherever possible. Character, Date, Decimal, Integer, RowID, RecID, Raw, Logical, Handle, MEMPTR. Include files have an .i extension. MESSAGE VALID-HANDLE(whand) VIEW-AS ALERT-BOX INFORMATION BUTTONS OK. Ans:- Progress supports 12 types variable: 12.Blob (open edge-- for saving the images), 13.Clob (open edge-- for saving the images). So anyway I'm guessing that yes, your code should work for ABL clients accessing the DB through the ABL engine, however isn't feasible for clients that only access OE through the SQL engine (which uses Java stored procedures for triggers that are entirely separate from ABL triggers). Can we run an internal procedure with the persistent option? Progress supports one dimensional arrays, but they are called EXTENTS. Then again I think that complex GUIs are probably a mistake in the first place. You can also define a indeterminate array without a set length. Or, you can put the value in an SP or singleton. What is Schedule order and explain its Process cycle? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. BTW -- I do agree that the documentation should be done differently. where there were no parameters, which is a silly example? And you think we, hear it about continuing old conventions, you should, hear what happens when we don't! Why does progress use frames? I don't see a problem with adding more and I don't believe that it would break any automated processes. Can we pass an include file as an argument to another include file? What is the definition of shared variable? 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 they should not be. Wouldn't it be interesting to have a new, separate best practices manual? DEFINE VARIABLE . Such as using shared variables / temp-tables as an example of procedural programming in the new OO intro docs translation here. You can always use operating system utilities like grep. Windows contain frames and dialog boxes. What will be the lock when we read the record and update the record? Contain function cab be used by For First but not by Find First. You can make this much better and more efficient with any regexp describing exactly what you want to look for. Q:- Diff b/w PUT, Set, Update and Display? What are the types of frames? When you read a record from the database, Progress makes it available to your application in the record buffer.