Returns True value if a record is found that meets the specified find criteria, else it returns false. Where does the version of Hamapil that is different from the Gemara come from? I can understand existing "shared" support remaining in the language, but adding support for shared "stuff" in new technology like PDS??? Then again I think that complex GUIs are probably a mistake in the first place. Prompt-for moves the user input to the screen buffer. Why does Acts not mention the deaths of Peter and Paul? A Block is a series of 4GL statements grouped together and treated as a single unit. What will return if search does not find the file? We have ProLint for telling us things like the use of deprecated features. It strikes me as a way of being presented with a solution and then denying it by defining it out of existence. Progress 4GL - Define variable month/year Ask Question Asked 7 years, 10 months ago Modified 7 years, 10 months ago Viewed 2k times 1 Here's the problem, i need to create a date range on the variable below. Example: Entry (3,Progress:RDBMS:MfgPro:Database,:) = MfgPro. The scope remains after the RUN statement executes and it completes until you remove it. The calling procedures temp table and the called procedures temp table need not have matching indexes. Ans:- PUT - is used to send/display the data except on terminal like printer, fax, any file etc. See Trademarks for appropriate markings. What is can-find function? I'm not dealing with other languages though, I'm dealing with the ABL & it's documentation, which keeps touting shared variables as a possible solution to different problems. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. 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. Which language's style guidelines should be used when writing code that is supposed to be called from another language? progress-4gl Tutorial - Variables - SO Documentation Normalization is essentially a two step process. It would cause people, with some code bases to avoid upgrading and it would, break a lot of automated build processes. Q:- What is difference between STREAM , OUTPUT TO, and OUTPUT TO VALUE? In can-find u can't manipulate the data, but in find u can with exclusive lock. Say for INPUT, OUTPUT and INPUT-OUTPUT parameter. What a PITA. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Thanks Rrojo, but RUN command is to call it from Progress or Unix ? IMHO Progress 4GL is fairly weak in this regard -- it doesn't warn about lots of things that it ought to warn about and that just encourages a lot of bad practices. Function can be defined inside the procedure , but procedure can't . In the following code examples, the client side procedure; client.p and the two AppServer side procedures; setPropath.p and getPropath.p, demonstrate how to programmatically set and get the PROPATH environment variable of an AppServer session at runtime using 4GL / ABL. You can use the ACCUMULATE statement only in blocks with the implicit looping property. What is an Include file? 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. Can we define the same NEW SHARED variable in Multiple Procedures? Stores the identifier for the records stored in the database. Actually, looking at this, isn't "sharing" information between procedures generally something to be avoided except when passing values through a set of well-defined APIs - which is actually what the next sentence states: Alternatively, a procedure can define public internal procedures or user-defined functions to allow controlled access to its data. Has the Melford Hall manuscript poem "Whoso terms love a fire" been attributed to any poetDonne, Roe, or other? 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. You have no argument that it is not a silver bullet. How to make an existing frame responsive in Openedge,progress 4gl When you pass arguments to an external procedure, Progress converts those arguments to character format. A progres 4GL procedure you can execute with run withina progress session and is normally not saved in the database. How will you avoid that? Progress ABL is statically typed. If one is making minor tweaks, there is a strong tendancy to just leave things as they are. If it was easier for legacy developers to move things forward, maybe they would. JavaScript is disabled. How will you use more than one for each statement? [Stackoverflow] [Progress OpenEdge ABL] Progress 4gl, How to check if a record(temp-table and database record) updated? Is "I didn't think it was serious" usually a good defence against "duty to rescue"? Making statements based on opinion; back them up with references or personal experience. Ans:- Argument:- U can pass the argument at compile time. Returns an integer giving the position of an expression in a list. You can make this much better and more efficient with any regexp describing exactly what you want to look for. Here's the problem, i need to create a date range on the variable below. While updating it will be upgrading to exclusive lock else it will be in shared lock status. 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. Learn progress-4gl - Progress ABL is statically typed. What will be the lock when we read the record and update the record? This yields more efficient code.). What is the difference between Procedures and Functions? [FRAME frame | BROWSE browse] field The name of the field or variable (field) to be set from the corresponding value found in the screen buffer or expression.The field must be qualified by a frame name (frame) or browse name (browse) if field is specified as an input widget in more than one frame. 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. Other languages provide equivalent constructs with the "static" keyword for session wide, global variables and "ThreadLocal" or "thread static . What is this brick with a round back and a stud on the side used for? Others users can modify the data of the table which is no-locked using exclusive-lock. It is depending on the logic build in the include file. 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. Are these even meaningful? Re-fetch record and modify its lock status. Is "I didn't think it was serious" usually a good defence against "duty to rescue"? 5. Why refined oil is cheaper than cold press oil? Searches the directories and libraries defined in the PROPATH environment variable for a file. 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). 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. //An character array with length = 5, DEFINE VARIABLE j AS INTEGER EXTENT NO-UNDO. Progress allows you to set one index as primary and uses it by default when retrieving or ordering records. What are the different types of blocks available in progress? [ PRIVATE | PROTECTED | PUBLIC ] VARIABLE variable-name. Yes, there are. 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Q:- Diff b/w PUT, Set, Update and Display? Why do we normalize database? [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. It will commit the data to the database only at the end of the outer repeat block. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. What is Wario dropping at the end of Super Mario Land 2 and why? 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. When I pass Temp table as parameters, what are the rules apply to Temp table parameters? A relational table is said to be a particular normal form if it satisfied a certain set of constraints. Does internal procedure create .r file during execution? By Defining the OUTPUT TO VALUE you can send the data to dynamically change the file name and only single destination at a time. MATCHES does not use index information when performing a comparison; it always scans the entire data table. The value for these variables is assigned only once during the login and will remain untill the session ends. Not only does that provide the programmer new to this area with guidance in the right usage pattern, but it will help to educate him or her on how he or she might rework older code. Screen Buffer:- to display the data on screen from record buffer. With a true singleton, you don't have to instantiate the context class, but you would provide a "LoginContext.Current" property. So I would say that shared variables were discussed, in the book "for historical reference", and if their. Thanks for contributing an answer to Stack Overflow! 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. And display. 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. Share-Lock(default lock, other user can read but not update), Exclusive-lock (other cannot read and update). Defining a variable LIKE a database field requiers the database to always be connected. As such, I felt it had to be reasonably inclusive. What are the 4 ways to connect a Database? 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. You must log in or register to reply here. 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. Nor is the idea that compilers, in general, should do so. Shared variables need to be relegated to the "for historical information only" pile and left there. This behavior supports recursive procedures and bill-of-materials applications. And, another factor I think is that PSC seems to be, very conscious of the fact that there are a lot of. .lk (lock file, if this file is available means database is up), 6. Users should be encouraged to move to more recent, better ways of doing things rather than perpetuating older, obsolete techniques. The called procedure must name the same variable in a DEFINE SHARED VARIABLE statement. 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. Being able to use 'deprecated' langauge elements is one thing. ProLint is wonderful but it covers a different set of problems. 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. User without create permission can create a custom object from Managed package using Custom Rest API. A transaction is a set of changes to the database, which the system either completes or discards, leaving no modification to the database. Set - is the combination of Prompt-For + Assign. The length (extent) can be set in run-time. You can always use operating system utilities like grep. 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. 2. 10.1A Progress 4GL Handbook, by John Sadd and Shared Variab Progress ABL is statically typed. This is a functionality provided by Progress to upload data into the tables with proper validations. Connect and share knowledge within a single location that is structured and easy to search. It returns 0 if the expression is not in the list. Can someone point to an example or paste code snippet here ? It will be upgraded to Exclusive lock when data is updated. However, they should be labled as such and pointers provided to current languange elements and techniques that should be followed. We cannot compile an include file. 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. 1) There should be a default list that contains all keywords which PSC has deprecated (EDITING, PUT SCREEN etc). Different common include files and its use? //A variable with a label. I'm using 10.2B. If time does not permit, one doesn't need the compile nagging 20 times when doing 20 compiles. What is the difference between ENABLE and VIEW Statement? Get monthly updates about new articles, cheatsheets, and tricks. Strong Scoped Reference if the buffer is strong scoped then you cannot reference that buffer in a containing block .The buffer is always scoped to the strong scope block. 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. And you think we hear it about continuing old conventions, you should hear what happens when we don't! Making statements based on opinion; back them up with references or personal experience. If frame A is scoped to the Procedure block then will the scope of frame A be available throughout the entire procedure? The underlying use case for my question was for a way of implementing auto-incrementing primary keys on INSERTs that would communicate back to the client the inserted ID, so that I would not have to force the client to either. 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. No, only external Procedures will create .r file during execution and can have more than one Internal Procedures. How to accept input parameters in Progress procedure So best programming practice is that whenever use the exclusive-lock also use the no-wait. Ans:- 1. find is a statement and can-find is a function. The underlying record buffer of a field or variable is unaffected. Include file can be compiled in case of the code built inside can execute independently. 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. Does a password policy with a restriction of repeated characters increase security? What is the difference between Persistent and Non-Persistent Procedures? 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. For what domains is it better? Is there a generic term for these trajectories? INPUT-OUTPUT PARAMETER - Defines a parameter that receives an initial value passed from the calling procedure that can be subsequently modified by the called procedure. 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. What are the different types of purchase order available in Mfg/Pro? Not the answer you're looking for? Can-find is used only for data existence. What should I follow, if two altimeters show different altitudes? Such as using shared variables / temp-tables as an example of procedural programming in the new OO intro docs translation here. The output to statement is your tool for redirecting the default stream to another destination. What will be the lock when we read the record and update the record? Progress KB - How to change the current working directory of a 4GL session on Windows? DEFINE VARIABLE statement - Progress.com What is the difference between Temp-Table and Work-Table? SYNTAX:- NUM-ENTRIES ( list [ , character ] ). 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:- Can you define a variable with same name both inside and outside a procedure? What is record scope? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. What are the different types of Blocks? Progress uses that buffer to store one record at a time from the table as the records are needed during the procedure. Otherwise, it is the directory specified using the Temporary Directory (-T) parameter. My point, though, is that one can need to compile a module many times in the process of working on it. Although I suspect that if I cared more I might find that OO might be better when writing complex GUIs. What is a Query? Means same time other user can not use that db table. ENABLE Enables input for one or more field-level and child frame widgets within a frame. Progress ABL is a programming language tied to the Progress OpenEdge environment, its database and surrounding utilities. 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). I.e., even if you aren't tackling best practices and I'm not sure that you aren't, really, in that book the focus should be on understanding what goes on with shared variables, why they are problematic, and what more modern techniques are desirable to use instead. 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. That is, the record is active until the block ends. One doesn't want new developers getting the idea that SVs are anything other than carry-overs from much prior versions of the language. 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'm saying their disadvantages need to be consistently emphasized, not just be stuck in one spot and then that section pointed to as a disclaimer. You must log in or register to reply here. You can specify "-T c:\temp" in a .pf but not "-T %TEMP%". VARIABLE variable-name Defines and identifies a variable whose value you can access only within the current procedure, method of a class (including constructors, destructors, and property accessors), or as a PRIVATE data member of a class. Connect and share knowledge within a single location that is structured and easy to search. A preprocessor directive is a statement that begins with an ampersand and is meaningful only to the preprocessor. Defines or forward declares a user-defined function. Some people report, it as a critical bug even if we didn't intend to do. 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. Defines and identifies a variable to be shared by a procedure called directly or indirectly by the current procedure. Ubuntu won't accept my choice of password, Generating points along line with specifying the origin of point generation in QGIS. "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. Sends the value of one or more expressions to an output destination other than the terminal. 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. That would have the unfortunate effect of turning a warning into an error. Defines and identifies a variable that was created by another procedure that used the DEFINE NEW SHARED VARIABLE or DEFINE NEW GLOBAL SHARED VARIABLE statement. 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. It can be done using the extent statement during the variable declaration. As n vn u want recurring = exact qty. If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? Individual positions i the array is accessed using "standard" c-style brackets. If u define the temp table then first we update the data into temp table then from temp table with one shot we can update all changes to database directly, mean while at the time of temp table updation, other user can use the same table, means we have reduces the network traffic and reduces hitting of db table.
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