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HowTo: Using SQL get Updated/Deleted/Inserted rows ID/content


mLipok
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Some time ago once forum memeber asked about how to get updated rows ID.

In PostgreSQL you can do it like this.

UPDATE "customers" SET "first_name" = 'Jan'  WHERE "last_name" = 'Kowalski'  RETURNING *
UPDATE "customers" SET "first_name" = 'Jan'  WHERE "last_name" = 'Kowalski'  RETURNING "customer_id"

 

EDIT:

You can also use RETURNING clause with INSERT and DELETE:

https://www.postgresql.org/docs/9.0/static/sql-update.html
https://www.postgresql.org/docs/8.2/static/sql-insert.html
https://www.postgresql.org/docs/8.2/static/sql-delete.html
 

 

Edited by mLipok

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My contribution to others projects or UDF based on  others projects: * _sql.au3 UDF  * POP3.au3 UDF *  RTF Printer - UDF * XML.au3 UDF * ADO.au3 UDF SMTP Mailer UDF * Dual Monitor resolution detection * * 2GUI on Dual Monitor System * _SciLexer.au3 UDF * SciTE - Lexer for console pane

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"Program are meant to be read by humans and only incidentally for computers and execute" - Donald Knuth, "The Art of Computer Programming"
:naughty:  :ranting:, be  :) and       \\//_.

Anticipating Errors :  "Any program that accepts data from a user must include code to validate that data before sending it to the data store. You cannot rely on the data store, ...., or even your programming language to notify you of problems. You must check every byte entered by your users, making sure that data is the correct type for its field and that required fields are not empty."

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It's possible to get that done reliably and portably while remaining within the realm of pure SQL. Returning, Output and YouNameIt are clearly outside relational algebra and qualify as proprietary extensions acting as syntactic sugar.

Two obvious ways to perform the same thing, portably:

begin immediate;
create temp table UpdatedCustomers as select * from customers WHERE "last_name" = 'Kowalski';
UPDATE "customers" SET "first_name" = 'Jan' WHERE "last_name" = 'Kowalski';
select * from UpdatedCustomers;
drop table UpdatedCustomers;
commit;

create temp table UpdatedCustomers ("customer_id" integer primary key);
create trigger trUpdateCustomers after update of "customer_id" on "customers"
  begin
    insert or ignore into UpdatedCustomers values (old."customer_id");
  end;
--  .../...
UPDATE "customers" SET "first_name" = 'Jan'  WHERE "last_name" = 'Kowalski'  RETURNING "customer_id";     -- done
select * from UpdatedCustomers;
delete from UpdatedCustomers;

Also I question the semantics of the second proposed statement in the PostgreSQL example:

UPDATE Items SET UnitPrice = UnitPrice * 1.05 WHERE ItemFamilly = 'DVD' RETURNING UnitPrice;

Would that return old or adjusted UnitPrices?

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SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
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8 hours ago, jchd said:

Would that return old or adjusted UnitPrices?

Adjusted, old are a past.

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Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind. 

My contribution (my own projects): * Debenu Quick PDF Library - UDF * Debenu PDF Viewer SDK - UDF * Acrobat Reader - ActiveX Viewer * UDF for PDFCreator v1.x.x * XZip - UDF * AppCompatFlags UDF * CrowdinAPI UDF * _WinMergeCompare2Files() * _JavaExceptionAdd() * _IsBeta() * Writing DPI Awareness App - workaround * _AutoIt_RequiredVersion() * Chilkatsoft.au3 UDF * TeamViewer.au3 UDF * JavaManagement UDF * VIES over SOAP * WinSCP UDF * GHAPI UDF - modest begining - comunication with GitHub REST APIErrorLog.au3 UDF - A logging Library * Include Dependency Tree (Tool for analyzing script relations) * Show_Macro_Values.au3 *

 

My contribution to others projects or UDF based on  others projects: * _sql.au3 UDF  * POP3.au3 UDF *  RTF Printer - UDF * XML.au3 UDF * ADO.au3 UDF SMTP Mailer UDF * Dual Monitor resolution detection * * 2GUI on Dual Monitor System * _SciLexer.au3 UDF * SciTE - Lexer for console pane

Useful links: * Forum Rules * Forum etiquette *  Forum Information and FAQs * How to post code on the forum * AutoIt Online Documentation * AutoIt Online Beta Documentation * SciTE4AutoIt3 getting started * Convert text blocks to AutoIt code * Games made in Autoit * Programming related sites * Polish AutoIt Tutorial * DllCall Code Generator * 

Wiki: Expand your knowledge - AutoIt Wiki * Collection of User Defined Functions * How to use HelpFile * Good coding practices in AutoIt * 

OpenOffice/LibreOffice/XLS Related: WriterDemo.au3 * XLS/MDB from scratch with ADOX

IE Related:  * How to use IE.au3  UDF with  AutoIt v3.3.14.x * Why isn't Autoit able to click a Javascript Dialog? * Clicking javascript button with no ID * IE document >> save as MHT file * IETab Switcher (by LarsJ ) * HTML Entities * _IEquerySelectorAll() (by uncommon) * IE in TaskSchedulerIE Embedded Control Versioning (use IE9+ and HTML5 in a GUI) * PDF Related:How to get reference to PDF object embeded in IE * IE on Windows 11

I encourage you to read: * Global Vars * Best Coding Practices * Please explain code used in Help file for several File functions * OOP-like approach in AutoIt * UDF-Spec Questions *  EXAMPLE: How To Catch ConsoleWrite() output to a file or to CMD *

I also encourage you to check awesome @trancexx code:  * Create COM objects from modules without any demand on user to register anything. * Another COM object registering stuffOnHungApp handlerAvoid "AutoIt Error" message box in unknown errors  * HTML editor

winhttp.au3 related : * https://www.autoitscript.com/forum/topic/206771-winhttpau3-download-problem-youre-speaking-plain-http-to-an-ssl-enabled-server-port/

"Homo sum; humani nil a me alienum puto" - Publius Terentius Afer
"Program are meant to be read by humans and only incidentally for computers and execute" - Donald Knuth, "The Art of Computer Programming"
:naughty:  :ranting:, be  :) and       \\//_.

Anticipating Errors :  "Any program that accepts data from a user must include code to validate that data before sending it to the data store. You cannot rely on the data store, ...., or even your programming language to notify you of problems. You must check every byte entered by your users, making sure that data is the correct type for its field and that required fields are not empty."

Signature last update: 2023-04-24

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