That does not make it a virtue to guide people toward usage which we now recognize as undesireable. If we understand that they are evil, then we won't be tempted to misuse them, i.e., to use them when it isn't absolutely necessary if any such conditions exist. Do you have benchmarks to prove that they have measurable performance advantages? My impression of the people doing the development on the OO stuff is that they actually have a pretty clear vision, even a bit religious at times. My question is that you seem to be suggesting that OO is good for some problem domains and that something else is better for other problem domains. . In update statement it will display the previous value on screen buffer and ask to user to overwrite the new value which is to be updated, means data will move to from screen buffer to record buffer to database. The Set Statement accepts the input and then puts the data in the screen buffer name and in the specified fields or variables. Not the answer you're looking for? 6. The function returns TRUE if the specified user ID has access according to the list. [Stackoverflow] [Progress OpenEdge ABL] How to get labels from temp table if its field datatype is LIKE table-name - Progress 4GL? And not every "we" "already has it". If you haven't got a Progress session then you can run it from the command prompt with the statement rrojo7229 gave. Did I not indicate that it is very possible to write bad OO code? Here's the problem, i need to create a date range on the variable below. Are compiled separately from the procedure that initiates their execution, they do not have access to the procedures frame, widgets and variables. rev2023.5.1.43405. What are types of locks? Using which locks you can update a table? Progress recompiles the called procedure, substitutes arguments, and then runs the procedure. Explain the data moves between the calling procedure and the called procedure depending on the Parameter type. I'm not saying that instruction of historical language element usages should be eliminated. You have no argument that it is not a silver bullet. &GLOBAL DEFINE and &SCOPED DEFINE directives allows you to define preprocessor names, which are compile time constants. Hope it helps. DEFINE VARIABLE v-cha-work AS CHARACTER NO-UNDO. And you can pass in a custom message, like what to use instead. To you and I and a bunch of other people, shared, variables are anathema, but there are still a lot of. The mis-use is what makes them evil, not their existence. Find centralized, trusted content and collaborate around the technologies you use most. MATCHES does not use index information when performing a comparison; it always scans the entire data table. A Widget is an object that provides visual and interactive capabilities for a progress application. 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. I would submit that at the very least archaic outdated methods should not be discussed as "traditional" but "deprecated" or "when nothing better was available". If there existed a SQL function that would return a special session ID that corresponded to the client's transient connection to the SQL engine, it would be possible to have the client and trigger/stored procedure communicate using a pre-determined table as a request queue (by using the session ID as a key). What is a trigger and what are the different types of triggers? Why did US v. Assange skip the court of appeal? I agree that ProRefactor's capablities should be offered -- it's silly to deprecate a feature without an alternative reccomendation. of a reverse reserved keyword kind of thing. Define shared variable variable name during the definition of the variable in other sub programs. It is used to repeat the execution of the set of statements until the endkey is pressed. Supplier schedules specify dates and even hours of delivery for the near term, and inform MRP and the supplier about long-term plans. I truly appreciate the time and work you put into sharing your knowledge. Progress KB - How to change the current working directory of a 4GL session on Windows? It is easy to be dismissive but it would be more useful to be clear about what exceptions or qualifications you are making. No. Yes, and one can make a good case that static variables are also evil and are bad OO. There is plenty of room for both solutions. How to define a shared lock in for each block? . Extracting arguments from a list of function calls, User without create permission can create a custom object from Managed package using Custom Rest API, Ubuntu won't accept my choice of password. I agree with you that it is an important goal, but I also recognize that it is not an easy one. Returns a 0 if the expression is not in the list. 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). Find centralized, trusted content and collaborate around the technologies you use most. Ans:- PUT - is used to send/display the data except on terminal like printer, fax, any file etc. Progress Documentation The output to statement is your tool for redirecting the default stream to another destination. Prompt-for statement only accepts the input and stores it in the screen buffer. After half a year, I began understand the intricacies of working with this server and procedures written in ABL. Data integrity means that Progress stores completed data and does not store incomplete data in the. I tried to RUN it from Unix (ksh shell), but received a message ksh: run: not found. This acts the same way the data entered manually with all the validations put in the program. Would My Planets Blue Sun Kill Earth-Life? Progress KB - SESSION:TEMP-DIRECTORY does not change when Windows current directory is changed with Win32 API call. Some people report it as a critical bug even if we didn't intend to do it! And so is using include files in lieu of .p's and super procedures. 3. How can I control PNP and NPN transistors together from one pin? We have ProLint for telling us things like the use of deprecated features. Static variables do have their uses, albeit in very restricted cases. Record Buffer - A temporary storage area in data memory for a record, field or variable. 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. Find centralized, trusted content and collaborate around the technologies you use most. (Could be thought somehow as the 'reverse' to the existing keyword forget list). How to find all the defined variables in Progress-4gl? Procedures can use shared variables and other mechanisms to share data between. Record buffer:- A temporary storage area in data memory for a record, field, or variable. DEFINE VARIABLE . 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. Searches the directories and libraries defined in the PROPATH environment variable for a file. 1) There should be a default list that contains all keywords which PSC has deprecated (EDITING, PUT SCREEN etc). 3. 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. Now remember: All fields will have to be manually repositioned inside the frame. A preprocessor directive is a statement that begins with an ampersand (&) and is meaningful only to the preprocessor. 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. 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. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, Delphi connection to OpenEdge Progress-4GL Database, progress 4gl OpenEdge abl delete file from directory, Reflection in OpenEdge ABL / Progress 4GL, OpenEdge - Progress ABL: How to open a web browser inside a dialog window, OpenEdge Progress 4GL Query returns (MISSING) after % sign, Progress 4GL - How to create infinite scroll browse, PROCESS EVENTS not working inside the OUTPUT TO - PROGRESS 4GL. Myself, I think having the compiler throw non-fatal warnings would be a bad idea. DELETE WIDGET whand. When you write a record to the database, Progress gets that record from the record buffer. If no locks are specified then it will be specified as shared lock. Integer any nos without the decimal initial value - 0, Character maximum 256 char , Alphanumeric Initial value, Decimal any nos with the exponentials Initial value 0.00. More correctly, I think it is "Static variables get, used", but where are they a better solution than a. 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? Can we run an internal procedure with the persistent option? //An character array with length = 5, DEFINE VARIABLE j AS INTEGER EXTENT NO-UNDO. For every DISPLAY statement, Progress needs a frame. If you invoke the ENABLE statement for a frame, Progress brings the frame into view unless the HIDDEN attribute for the frame or one of its ancestor frames or windows is TRUE. If you use the APPEND option, Progress appends the incoming data to the existing data. 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. Does internal procedure create .r file during execution? In can-find u can't use the exclusive-lock, but in find u can. This yields more efficient code.). So best programming practice is that whenever use the exclusive-lock also use the no-wait. Personally I am very much against using shared variables, but there are always trade-offs to be considered - Performance vs. progress-4gl Tutorial - Variables - SO Documentation The called procedure returns the modified value to one of the following destinations: If the calling procedure runs the current (called) procedure synchronously, the value is returned to the corresponding INPUT-OUTPUT parameter of the RUN statement in the calling procedure. 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. where there were no parameters, which is a silly example? If you do not want, or if you do not need, the value of a variable to be undone even when it has been changed during a transaction, use the NO-UNDO option with the DEFINE VARIABLE statement. A Block is a series of 4GL statements grouped together and treated as a single unit. What will it return if expression is not in the list? Is it necessary to use a READKEY Statement in the EDITING Phrase? If u doesnt define the temp table and u need to update the 1laks records in database then in that case u r hitting the database every time for updating the records and u keeps busy the network traffic also. A .pf is a collection of client startup parameters that you invoke collectively with the -pf startup parameter on your client's command line. You don't "access" a .pf. Can I use an 11 watt LED bulb in a lamp rated for 8.6 watts maximum? Progress uses that buffer to store one record at a time from the table as the records are needed during the procedure. What will be the lock when we read the record and update the record? 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. 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. No lock is useful in reporting purposes. Define Input Parameter, Output Parameter and Input-Output Parameter? We could refer to it as the keywordtrytoforget list. 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. Load data through online maintenance programs. Find centralized, trusted content and collaborate around the technologies you use most. Eg deletion of sod_det where so_mstr is deleted. 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. How to find all the defined variables in Progress-4gl? Q:- Diff b/w PUT, Set, Update and Display? If you use shared lock it will upgrade to exclusive lock automatically if update is given. 1. If going-way-back developers want to use them fine, but they should be moving to other technologies. PROGRESS supports 2 types of database triggers: Always execute when a specified event occurs, regardless of what application initiates the event. I agree with you guys on shared variables. 2. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Other methods (like "choose") have been deprecated by PSC, but nothing's been suggested to replace it. What is the definition of shared variable? I think that nag messages are a long overdue idea and I hope to see some soon. You can use fields () attribute that allows you bring the selected fields of the table. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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 :-). And so is using include files in lieu of .p's and super procedures, defining multiple static queries as opposed to using dynamic query specifications and the like. /* These variables are declared with `NO-UNDO`. It may not display this or other websites correctly. Without nag messages everyone gets to profess surprise that such and such a feature is deprecated when we have all known forever that it was a bad thing. What flags you need to set for the same? Prompt-for moves the user input to the screen buffer. They don't want to make people feel like they have to change what they are doing in order to move to the latest release. Users should be encouraged to move to more recent, better ways of doing things rather than perpetuating older, obsolete techniques. How are engines numbered on Starship and Super Heavy? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Has the Melford Hall manuscript poem "Whoso terms love a fire" been attributed to any poetDonne, Roe, or other? That is, the record is active until the block ends. Have access to the frames, widgets, and variables defined in the enclosing procedure. 5. This modified text is an extract of the original. I've looked at the SQL Reference and SQL Development handbooks but didn't see anything like this. 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. What is the difference between Begins and Matches Operator? Of course, couldn't one simply put the despised keywords into the forget list and get error messages now? Why do we normalize database? Sorts the pre-selected records by the value of expression. Would My Planets Blue Sun Kill Earth-Life? Can I use the spell Immovable Object to create a castle which floats above the clouds? In for block u can use field clause, but in find statement u cant use field clause. If you need to share buffers among procedures, use the DEFINE SHARED BUFFER statement. What is the difference between Prompt-For statement and Set Statement? To be sure, it should be clear to people that, they can move to the latest release and it, just works. It will be upgraded to Exclusive lock when data is updated. How about using PUBLISH and SUBSCRIBE? In fact, unfortunate as it may be, most Progress users have never even heard of it. Perhaps we should stop and think about whether or not the OO kool-aid is really all that it's knocked up to be. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. What is can-find function? //An character array with length = 5, DEFINE VARIABLE j AS INTEGER EXTENT NO-UNDO. It may not display this or other websites correctly. We use the temp table in client server architecture. But doing that for a widget that already has an event procedure will cause it to stop doing what it currently does (unless you can code it, but again I don't think you have the code). One doesn't want new developers getting the idea that SVs are anything other than carry-overs from much prior versions of the language. Scanning for deprecated usage is exactly the same kind of scanning for other things one doesn't want in one's code that ProLint was designed for. What will UNFORMATTED option do in the PUT Statement? You can also get some basic help from the compiler (assuming you have a development license of some kind). Tell about ENTRY Function with one example? Since find does not support by, use index comes in handy to sort the records and it makes clear to which of the defined indexes to use for the sort order. 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. By Defining the OUTPUT TO VALUE you can send the data to dynamically change the file name and only single destination at a time. Which was the first Sci-Fi story to predict obnoxious "robo calls"? Why do we use index? This will create two cross referencing text files that will look like this: "NEW-SHR-VARIABLE bool" in proc1xref.txt tells you that a shared variable named bool has been created and "ACCESS SHARED bool" tells you that it has been used. There are two types of frames: down and one-down. The use-index option of the record phrase allows you to choose the defined index by which you want to access the selected records. Ans: Three type of Purchase Order are there in MFG/PRO: Ans: Use these for single transactions with a supplier, where there is no assumption that further transactions will occur. Is there any way to store a session variable in OpenEdge SQL similar to how Oracle's RETURNING INTO clause works? Does a password policy with a restriction of repeated characters increase security? Update - is the combination of Display + Prompt-for + Assign. 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. Non-Persistant procedures will store the values to the variables only till the procedure is executing. Ans: MRP ignores blanket orders, and receipts cannot be processed against them. What are the types of frames? Progress ABL is a strongly typed, late-bound, English-like programming language with growing support for object orientation. What is the goal that you are trying to achieve? What a PITA. 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. Why does progress use frames? Stores the identifier for the records stored in the database. //A 64-bit integer initialized to -200, DEFINE VARIABLE l AS LOGICAL NO-UNDO. Why does Acts not mention the deaths of Peter and Paul? So the scope of the record is the portion of the procedure where that record buffer is active. It will change the output destination in a procedure; the output goes to that destination until you close it with the output close statement, or until you name a new output destination. A trigger is a block of 4GL code that executes whenever a specific event occurs. 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. 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. What is the difference between LIKE and AS while defining a variable? Connect and share knowledge within a single location that is structured and easy to search. Since I do not have anything except consoles and notebook parsing, certain procedures are more complicated.
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