abap check if record exists in database

abap check if record exists in database

The method using the COUNT statement is described in the bad example. It baffles me that people are using these 7.40+ features yet continue to use BINARY SEARCH instead ot SORTED/HASHED. SELECT * FROM sflight AS s WHERE seatsocc < s~seatsmax AND By using Open SQL, one can read and modify data, and also buffer data on the application server, which reduces the number of database accesses the system has to perform. If you need to search you need a key, so there's no reason not to use a SORTED or HASHED table where you cannot go wrong. An other method is using the UP TO 1 ROWS. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Since I started using SORTED and HASHED tables 18 years ago, I've never had a need to use BINARY SEARCH on tables I've defined myself. Good question, line_exists and READ TABLE both can only compare individual fields against a single value. An additional field contains a pointer to the actual table rows. Additionally we cant use binary search option in 7.40 table expression. I am wondering if we can use the "line_exists" for checking multiple conditions of the same value. Here are the few things to consider: LINE_EXISTS is same as READ TABLE . Like you said, sorted and hashed tables are the best bets. You can try to refer to the following codes according to your needs. In a few months, SAP Universal ID will be the only option to login to SAP Community. A lightweight, extensible, open-source, and cross-platform version of the Entity Framework data access technology. https://help.sap.com/doc/abapdocu_750_index_htm/7.50/en-US/abentable_expressions.htm. Zevolving is on Twitter, Facebook, Google+. Is there a shortcut or should I just loop at the table and check? specifies only the target cardinality. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Install SAP Free You can help by submitting your articles via Write a Post. This expression is possible for all results sets that can be defined using It is 2 1/2 inches wide and 1 1/2 tall, Duped/misled about safety of worksite, manager still unresponsive to my safety concerns. The following two queries are treated identically, even though the define different join expressions: On the SAP HANA database, both queries are treated identically. the clauses subquery_clauses. The target cardinality specifies the number of matching records for each record of the original data source (left data source). Otherwise I see no sense to remember it, because TRANSPORTING NO FIELDS, as you mentioned, has much bigger area of use, and yes, no SY-TABIX is also awkward. For reasons of downward compatibility, the old syntax is still supported and it wont be declared obsolete in the near future. Example Chaining of Table Expression within LINE_EXISTS now allowed. May be in next release . Of course, for internal tables ABAP developers can use SELECT SINGLE with TRANSPORTING NO FIELDS. As of ABAP release 7.91, a new syntax is available for specifying the cardinality of associations and joins in ABAP CDS and ABAP SQL. The unexpected result was that when a row cant be found, using table expressions with exceptions is ten times slower on average than all other lookup methods, including the good ol fashioned READ TABLE with SY-SUBRC. Like you , I suspect the performance difference lies in the exceptions/TRYCATCH mechanism. Thanks for the input, good point! It is difficult to decide whether to use SELECT SINGLE or SELECT UP TO 1 ROWS Because if you can rely on the fact that there is a record on the right side, you can as just well execute it as an inner join, because you dont have to consider cases where you dont find a record on the right side. public async Task AddStockAsync (List<GameBank> gameBank) { await _oyunPalasContext.GameBanks.AddRangeAsync (gameBank); await _oyunPalasContext.SaveChangesAsync (); } I wonder if I can check the serial and pin inserted before? So in most scenarios the difference between the options (apart from exceptions, which was the point of the blog) is a perfectly acceptable tradeoff for consistent and readable code. There is no particular problem with the method, but the more cases, the worse the performance. Example: This example is obviously easy to work out, but complex programs with several development iterations are a different story - especially when the filling, sorting and reading are spaced out in the code. Hi!, please be more explained as we cannot know what is in your mind!. if you have i.e. In addition, the source cardinality is set to MANY by default. I have no idea why SAP didn't just do a SY-SUBRC like with field symbols, particularly as there is such a performance penalty. Hello there, In my Blazor Server application, I am inserting a list of data into a database as follows with EF Core 6; . But ABAP developer has to use SELECT and ENDSELECT in order to compile and execute this existency check successfully. As always, well done and thanks for the info. Is . LINE_EXISTS( ) In ABAP 7.4, we have new syntax to check if the record exists in the internal table based on some conditions.

ABAP - Quick Reference A short overview of all statements, ordered . | Concepts If you have multiple accounts, use the Consolidation Tool to merge your content. Target cardinality of EXACT ONE: right-hand pruning and rewrite to inner join. About Stating the obvious here (which actually was already said), the big difference there is the EXCEPTION, not the different ways of read. ENDIF. I mean I am using an internal table and I want to check if a value is contained in one field of the internal table and I don't want to loop the table to find the value. So after reading (or failed reading) a million times the difference between ( READ TABLE vs VALUE with OPTIONAL ) is only 0.0003 seconds?? Is there any form of the select clause or any other technique that simply checks if the record exists? If there is even one case, there is no need to count the subsequent data, so there is no problem with this method. In short the merge WHEN NOT MATCH adds a new row WHEN MATCH will update a row if needed, in my example in the last link the WHEN NOT MATCH BY SOURCE is not needed in your case and thus removed. A distinction is drawn between source cardinality and target cardinality. Great Blog Mike, I have started following this blog. For compact and/or readable code, use table expressions. To check for a specific value without doing a loop or transferring values to a work area, you can use the READ statement with the addition TRANSPORTING NO FIELDS like so: READ TABLE itab WITH KEY FIELD = 'X' TRANSPORTING NO FIELDS. Is that possible? TRY-CATCH with table expressions can be a useful way to structure your code (e.g. UNION ] ) Checks the results set of a subquery. Is there a shortcut or should I just loop at the table and check? SAP NetWeaver AS ABAP Release 752, Copyright 2017 SAP AG. IF NOT line_exists( t_data[ table_line = lv_value ] ). SALV IDA (Integrated Data Access) Introduction, SALV IDA Add and Handle Hotspot (Hyperlink), http://zevolving.com/2015/03/abap-740-table-expressions-read-modif-itab-line/. So I am looping my internal table into a work area and I would like to use the fields from teh work area in a where clause. Consider adding values one by one in random order every INSERT into a sorted table adds performance cost, so here a one-off SORT at the end is likely to be more efficient. and if so how can I do that? Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread. It is better to use UP TO 1 ROWS with SELECT SINGLE or SELECT. It only checks if the line is there in the table with specified key or not. Only the target cardinality could be specified with the following syntax pattern: [1..*] means that each record in the left table, scarr in this example, has multiple matching records in the right table, spfli in this case. ENDIF. A set of technologies in the .NET Framework for building web applications and XML web services. I partly agree, but still find the additional VALUE clumsy. The 6 seconds however took me by surprise and is something to keep in mind. So a source cardinality of EXACT ONE allows for left-hand pruning as long as no field is picked from the left data source. lv_value = 7. I know I can pull back one field but I am interested in knowing if there is any other way ? Why does awk -F work for most letters, but not for the letter "t"? If you follow the very first link of the blog you'll see the documentation states: If the specified row is not found, a handleable expression of the class CX_SY_ITAB_LINE_NOT_FOUNDis raised in all operand positions, except when. SAP Transaction Codes Table Two things happened: After several comments and suggestions, I uploaded my test program to GitHub atabap_itab_perf. Anyway, I'm a bit surprised as I expected the results between READ TABLE and VALUE with OPTIONAL to be more leveled (even though is only 300 microseconds difference .. 0.0003 seconds!). I remember reading this a while ago, and thinking it's bizarre. What SAP ERP or SAP S/4HANA version is required to use 7.91 release? Syntax . Effect Checks the results set of a subquery. In a few months, SAP Universal ID will be the only option to login to SAP Community. How to troubleshoot crashes detected by Google Play Store for Flutter app, Cupertino DateTime picker interfering with scroll behaviour. The path field increases the result set in this case, as shown in the following screenshot: As of ABAP release 7.91, the following new cardinality syntax written in words is available in ABAP CDS and ABAP SQL: Example: CDS association with cardinality written in words, Example: SQL join with cardinality written in words. Hi, is it possible to use this together with other key than whole TABLE LINE? Thanks for for your reply. Why NOT to have a wrapper around Exception (RAISE) ? Feel free to play with it or even send any updates back via GitHub. A source cardinality of EXACT ONE allows the SQL Optimizer to prune the left data source if no field from the left side is used. You can check for the existence of a record without a loop. I am also working on performance and facing challenge using multiple line_exists for each value .With large data every time checking existence will not help much compare with sy-subrc . Your query will only ever return a row if it exists, so the case statement is redundant, you could just as well write. If you have multiple accounts, use the Consolidation Tool to merge your content. Keep in mind you can (and probably should) use binary search to speed this up. How can I apply in my situation? Work Area | Internal Table | LOOP IF ELSE, Part-11 check if record exists before insert cSharp sql, before Insert Record in Database Check duplicate value| Insert |Search|Update in VB.NET with code, Checking for existing record before Inserting in C#, How to Check If Record Exist Before Insert in C# with SQL | ProgrammingGeek, How to Check If Record Exist Before Insert Operation in Asp Net C# with SQL, I want to check if record exist and if not exist then i want to insert that record to database usin. . Ways of checking if record exists in itab without loop. [/abap_code]

Example - Compare with Table Expression and LINE_EXISTS and READ

I am working on a program that uploads data from a spreadsheet and inserts it into a table. A many-to-many relationship exists, for example, between customers and products: customers can purchase various products, and products can be purchased by many customers. Read and Modify the ITAB records without using the temporary work area or variables. I couldn't understand the merge statement, can you please elaborate? I will still go with theVALUE statement. As I was working on a performance-sensitive component, I tested it to see what performs best. Each sales order item belongs to exactly one sales order (source cardinality of exact one), Each sales order can have many sales order items (target cardinality of many). I know I can pull back one field but I am interested in knowing if there is any other way ? WRITE: /(20) ', ', lv_value. Good comparison forinternal table expressions. Without it, you will lose your content and badges. If you use the COUNT command, all the records will be scanned, so if the number of records is large, the performance will deteriorate. 1. Let's mention an other method where a workarea definition is required. Personally I think BINARY SEARCH is unreliable and should be avoided if possible. : did you really do a million lookups? Suppose if I wanted to search for whether the value '666' exists for f_num in any of these tables then is there an easy to do this in one statement rather than having to do: select count( * ) into v_count from A where f_num = '666'. No, this should definitely not the conclusion of this blog post. Find centralized, trusted content and collaborate around the technologies you use most. Critical issues have been reported with the following SDK versions: com.google.android.gms:play-services-safetynet:17.0.0, Flutter Dart - get localized country name from country code, navigatorState is null when using pushNamed Navigation onGenerateRoutes of GetMaterialPage, Android Sdk manager not found- Flutter doctor error, Flutter Laravel Push Notification without using any third party like(firebase,onesignal..etc), How to change the color of ElevatedButton when entering text in TextField. Good example 1 and good example 2 described the method of acquiring only one record. The error message shows also how to supress this extended check error. The VALUE constructors sole purpose here is the OPTIONAL bit that lets us do away with the exception. Making statements based on opinion; back them up with references or personal experience. A search with a loop is slow, dont use this. Thanks!. only with tex4ht and subfigure. Can I check for initial or not equal values with line_exists? 10001 900291 . [abap_code slider="X" title=""] It's a built-in function to which you pass a table expression. Connect and share knowledge within a single location that is structured and easy to search. The source cardinality is implicitly set to MANY by default. Select query should output like below: VBELN KUNNR. You can check for the existence of a record without a loop. This ABAP tutorial shows how to check existence of data in SAP tables using ABAP SELECT statements Especially for the first 4 cases. If using SQL-Server, there is the MERGE statement. This can significantly improve the query performance. If you want the result value, use the Table expression instead. i know its syntactically incorrect but I am trying to understand how we can achieve this. SAP Tools My question is, I want to fetch records with more than one sales order created for a customer. Nice blog! This mistake is not possible with sorted or hashed tables. zevolving.com is founded by and maintained by Naimesh Patel. Since mandt exists on every SAP table and sy-mandt is always available as a system variable, ABAP programmer does not have to define dummy local variables. It is possible with using the ABAP Table Expressions. Why Is PNG file with Drop Shadow in Flutter Web App Grainy? It will probably be made available in SAP HANA on-premise systems in the future. Also added chaining of the table expression example which is not yet allowed using LINE_EXISTS. To modify the deep component, the chaining table expressions can be used together with the exception handling (catching the exception is the same as line_exists = false). Contradictory references from my two PhD supervisors, 13 figures OK, 14 figures gives ! The syntax written in words is the recommended option. "source cardinality" is implicitly set to many, however with the new syntax this should be "exact one". LOOP AT has a more flexible WHERE clause and can be used for this purpose, but be sure to include an EXIT if you only want a single result. Sorry, I do not want to give misleading "conclusions". If you use the COUNT command, all the records will be scanned, so if the number of records is large, the performance will deteriorate. When used in the right way, it speeds up the query performance on the SAP HANA database. That means, for example, if an airline offers multiple flights, but each flight is assigned exactly one airline, the cardinality should be specified as ONE TO MANY. Especially, I would like to know a practical use case of "many to many". Using the above example: Full syntax of table expression in that predicate see here: https://help.sap.com/doc/abapdocu_750_index_htm/7.50/en-US/abentable_expressions.htm. zevolving.com is not affiliated with SAP AG. used to combine the result sets of multiple subqueries. So the difference compared to an exception becomes over 6 seconds when running through a million records. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. WRITE: /(20) ', ', lv_value. Alerting is not available for unauthorized users, Right click and copy the link to share this comment, the exception was no longer an influence (to be expected). If performance is number 1 priority and you need the data, READ TABLE is fastest. Cheers! If were talking anything less than thousands in a short space of time then you can safely ignore the impact. http://zevolving.com/2015/03/abap-740-table-expressions-read-modif-itab-line/. The field matnr seems to come from the material view (i.e. In a few months, SAP Universal ID will be the only option to login to SAP Community. Thanks for sharing. The source cardinality describes the number of matching records for the entries of the joined data source (right data source). For the SQL Optimizer, this means that the join can be rewritten to an inner join. Yes, it does work with the Multiple components. But on the other hand, I am not aware of any claims from SAP that the 'new ABAP' statements are faster, it's almost always been about function, readability, new possibilities, etc. But it's a good point for a complete comparison, so I've added it and updated the results directly in the blog above, thanks. It was just a quick-n-dirty originally for comparing just two options and just grew as a copy/paste of alternatives. The relational expression is true when the results set of the A target cardinality ofTO ONE is used by the SQL Optimizer for performance optimization by suppressing surplus joins. A good question, but no. [1..4]. Are interstellar penal colonies a feasible idea? In this existency check method, ABAP Select command is executed with Single and only mandt field is selected which is found on every table and it is stored into sy-mandt system variable. Are there military arguments why Russia would blow up the Kakhovka dam? left side), but since it is specified in the ON-condition as a 1:1 relation, this field is simply taken from the right side and the result remains the same. Does Bremsstrahlung happen when any of scattering take place (Compton, Rayleigh, Thomson etc.)? I always appreciate when someone does all the work for me and comes up with such simple, practical recommendations. However, caution is advised. Flutter change focus color and icon color but not works. This particular usage of VALUE may seem a little awkward. Caution: This optimization opportunity is currently only available in SAP HANA Cloud systems. To check for a specific value without doing a loop or transferring values to a work area, you can use the READ statement with the addition TRANSPORTING NO FIELDS like so: UPDATE: From release 740 ABAP contains the predicate function LINE_EXISTS which is described in this blog post. is this the average of multiple execution of the same tests? Absolute is how much are you processing. I know it is confusing, it took me some time to understand as well. "left data source" and "right data source" are easier for me to understand. If you compare only line_exists( ) with read table, I think read table should have TRANSPORT NO FIELD, to be fair :). Wow! If you have multiple accounts, use the Consolidation Tool to merge your content. Could you verify if my understanding is correct? Why is C++20's `std::popcount` restricted to unsigned types? LINE_EXISTS is same as READ TABLE TRANSPORTING NO FIELDS .. followed by SY-SUBRC CHECK. Yup, a million. It is interesting to see that the assumption of 'ABAP 7.4' elements being better than traditional elements fails sometimes. If you have multiple accounts, use the Consolidation Tool to merge your content. As mentioned earlier, it can only replace few instanced of the READ TABLE TRANSPORTING NO FIELDS which are not using the result value. I mean I am using an internal table and I want to check if a value is contained in one field of the internal table and I don't want to loop the table to find the value. 10004 900291. With the newly available target cardinality of EXACT ONE, it is clear that there is exactly one record on the right side. - Stefan Zvonar. This syntax is short form to READ TABLE with TRANSPORTING NO FIELDS followed by sy-subrc check. I am using an SQL server and EF Core 6. The call doesnt return any value. Very nice post, thank you for that. As mentioned in the other answer, this is incorrect. When used in the right way, it speeds up the query performance on the SAP HANA database. Be careful to use the correct cardinality or you may encounter unexpected results. SELECT 'Found' FROM services s WHERE s.idaccount IN (1421) Although it makes very little sense, you could write something like: SELECT CASE WHEN EXISTS (SELECT 1 FROM services WHERE idaccount = 1421) THEN 'Found' ELSE . Does the policy change for AI-generated content affect users who (want to) How do I check if a key in a record exists? ABAP programmer can add the pragma ##WRITE_OK to exclude this code statement from error list. Welcome to Zevolving - place where you find one of the best articles, tutorials for ABAP. This cardinality is translated to TO MANY on the SAP HANA database. I agree with Custodio and I know you enough to say that I shouldn't ask but . CRM Companies List The syntax checker checks the key elements of the association target. Web Based CRM Software, SAP Tutorials I had a small question, shouldn't try.catch be used where ever we use the new table expressions. Thanks for contributing an answer to Stack Overflow! I got excite to replace my parallel cursor algorithms but I think I would need to halt on that . I am confused about the words "source" and "target". [/abap_code] So the following READ TABLE can be rewritten using a table expression (the bit in square brackets): If the matching entry cannot be found, you need to catch the exception: Another alternative is to use a VALUE constructor expression where you can add the keyword OPTIONAL (or DEFAULT) to just initialize any non-found values. WRITE: / ', ', lv_value. A SORT can be beneficial in certain scenarios. lv_value = 15. Typical cardinalities are one-to-one (1:1), one-to-many (1:n), many-to-one (n:1), and many-to-many (n:m). My scenario involved internal table searches where the values would be missing a lot of the time. In above case, salesorder is the target and salesorderitem is the source. It is a very useful post. This blog post explains the new cardinality syntax, how it can improve query performance, and everything else you need to know about cardinalities in ABAP. This rewriting of a left outer join can lead to an optimized execution plan and accelerate the query performance massively. TRANSPORTING NO FIELDS .. followed by SY-SUBRC CHECK. subquery defined by the clauses subquery_clauses Checking for existence of a record 6164 Views Follow RSS Feed I want to do a SELECT from the db for a certain record but I do not need to return an fields. If so, you need SAP Universal ID. "target cardinality" in this case means, based on the target data source (salesorder), how many matching entries exist in salesorderitem, thus "many". The call doesn't return any value. Licence. And as far as I see 0.0003 seconds difference is neglectable. ), You can use line_index( idem ) and then read the internal table by the index if it's not 0. Agree, we (myself included) automatically assume new=faster. The cardinality specification should match the data in question. I've tried to use the column numbers (col3 and col2), but when I run a syntax check it doesn't like that. 10002 900292. | 158,203 | 4. This produces the syntax error that it doesnt like it .. After better reading of the article I noticed a small big detail, it says you "tested a million failed lookups". Even table expression don', "post-image">