Re: [firebird-support] Re: On Updating One Column Value, Update Time Stamp in Another Column

2017-08-09 Thread Paul Vinkenoog p...@vinkenoog.nl [firebird-support] 
Hi Vishal,

> I would also like to know that if I need to learn Triggers and Stored
> Procedures then what document should I refer, I am am new for triggers
> and SP. Googling is random way I see. Would you refer any good books
> for this?

You'll find lots of free documentation under

   http://www.firebirdsql.org/en/documentation/

More specifically, here's the Language Reference:

   
http://www.firebirdsql.org/file/documentation/reference_manuals/fblangref25-en/html/fblangref25.html

with the chapter on triggers:

   
http://www.firebirdsql.org/file/documentation/reference_manuals/fblangref25-en/html/fblangref25-ddl-trgr.html

and on Procedural SQL (the language you use inside triggers and Stored 
Procedures):

   
http://www.firebirdsql.org/file/documentation/reference_manuals/fblangref25-en/html/fblangref25-psql.html

The Firebird FAQ is also very useful:

   http://www.firebirdfaq.org/

And Helen Borrie's Firebird Book is a great manual which also includes 
chapter(s) on SP's, triggers and PSQL. It's not free though! You'll find 
it here:

   https://www.ibphoenix.com/

(You may need to scroll down a bit.)

Hope this helps!

Cheers,
Paul Vinkenoog

Re: [firebird-support] Re: On Updating One Column Value, Update Time Stamp in Another Column

2017-08-09 Thread Vishal Tiwari vishuals...@yahoo.co.in [firebird-support] 
Hi Paul,
You Rocks !!!n Yes It is working as expected.
I would also like to know that if I need to learn Triggers and Stored 
Procedures then what document should I refer, I am am new for triggers and SP. 
Googling is random way I see. Would you refer any good books for this?
Corrected Trigger is as below:
SET TERM ^ ;CREATE TRIGGER MYTRIGGER FOR TABLE_NAME ACTIVE
BEFORE UPDATE POSITION 0
as
begin
if (new.col3 is distinct from old.col3)
then new.col5 = current_timestamp;
end^
SET TERM ; ^
 

Thanking You And With Best Regards.
Vishal

On Wednesday, 9 August 2017 3:35 PM, "Paul Vinkenoog p...@vinkenoog.nl 
[firebird-support]"  wrote:
 

     Vishal Tiwari vishuals...@yahoo.co.in [firebird-support] schreef op 
09-08-2017 11:58:
> I have put table name as Table_Name, which is actual table name.
> 
> On Wednesday, 9 August 2017 3:27 PM, Vishal Tiwari
>  wrote:
> 
> Hi Paul,
> 
> I am getting below error while executing the trigger you shared. May
> be because of new FB version? I am executing using FlamRobin tool.
> 
> Please see error below:
> 
> *** IBPP::SQLException ***
> Context: Statement::Prepare( create trigger before update on
> Table_Name
> as
> begin
> if (new.col3 is distinct from old.col3)
> then new.col5 = current_timestamp )
> Message: isc_dsql_prepare failed
> 
> SQL Message : -104
> can't format message 13:896 -- message file
> C:\Windows\system32\firebird.msg not found
> 
> Engine Code : 335544569
> Engine Message :
> Dynamic SQL Error
> SQL error code = -104
> Token unknown - line 1, column 23
> update

My fault! If forgot the trigger name. It should be:

create trigger MyTrigger before update on Table_Name ...

Instead of MyTrigger, you choose a more meaningful name of course.

Cheers,
Paul Vinkenoog

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Re: [firebird-support] Re: On Updating One Column Value, Update Time Stamp in Another Column

2017-08-09 Thread Paul Vinkenoog p...@vinkenoog.nl [firebird-support] 
Vishal Tiwari vishuals...@yahoo.co.in [firebird-support] schreef op 
09-08-2017 11:58:
> I have put table name as Table_Name, which is actual table name.
> 
>  On Wednesday, 9 August 2017 3:27 PM, Vishal Tiwari
>  wrote:
> 
> Hi Paul,
> 
> I am getting below error while executing the trigger you shared. May
> be because of new FB version? I am executing using FlamRobin tool.
> 
> Please see error below:
> 
> *** IBPP::SQLException ***
> Context: Statement::Prepare( create trigger before update on
> Table_Name
> as
> begin
> if (new.col3 is distinct from old.col3)
> then new.col5 = current_timestamp )
> Message: isc_dsql_prepare failed
> 
> SQL Message : -104
> can't format message 13:896 -- message file
> C:\Windows\system32\firebird.msg not found
> 
> Engine Code: 335544569
> Engine Message :
> Dynamic SQL Error
> SQL error code = -104
> Token unknown - line 1, column 23
> update

My fault! If forgot the trigger name. It should be:

   create trigger MyTrigger before update on Table_Name ...

Instead of MyTrigger, you choose a more meaningful name of course.


Cheers,
Paul Vinkenoog

Re: [firebird-support] Re: On Updating One Column Value, Update Time Stamp in Another Column

2017-08-09 Thread Vishal Tiwari vishuals...@yahoo.co.in [firebird-support] 
I have put table name as Table_Name, which is actual table name. 

On Wednesday, 9 August 2017 3:27 PM, Vishal Tiwari 
 wrote:
 

 Hi Paul,
I am getting below error while executing the trigger you shared. May be because 
of new FB version? I am executing using FlamRobin tool.
Please see error below:
*** IBPP::SQLException ***Context: Statement::Prepare( create trigger before 
update on Table_Nameasbeginif (new.col3 is distinct from old.col3)then new.col5 
= current_timestamp )Message: isc_dsql_prepare failed
SQL Message : -104can't format message 13:896 -- message file 
C:\Windows\system32\firebird.msg not found
Engine Code    : 335544569Engine Message :Dynamic SQL ErrorSQL error code = 
-104Token unknown - line 1, column 23update
 

On Wednesday, 9 August 2017 3:15 PM, "Paul Vinkenoog p...@vinkenoog.nl 
[firebird-support]"  wrote:
 

     Hello Vishal,

> I have one table say "MyTable", which has five columns, say Col1,
> Col2,...,Col5 and it has 10 rows. Col5 is of Timestamp.
> 
> My issue is, whenever I am updating Col3, that time, only for that row
> of Col5, Timestamp value should be updated to the current timestamp.
> 
> What would be the best option for this?
> 
> If trigger is the best way then how would I do it? As I never worked
> on Triggers.

Yes, a trigger is definitely the way to go, e.g. like this:

set term #;
 create trigger before update on MyTable
 as
 begin
 if (new.col3 is distinct from old.col3)
 then new.col5 = current_timestamp;
 end#
 set term ;#

If col3 is non-nullable you can simply use "new.col3 <> old.col3" in the 
test.

Mind you, an explicit update that re-enters the existing value in col3 
won't cause col5 to be updated!

HTH,

Paul Vinkenoog

  #yiv2712576062 -- #yiv2712576062ygrp-mkp {border:1px solid 
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Re: [firebird-support] Re: On Updating One Column Value, Update Time Stamp in Another Column

2017-08-09 Thread Vishal Tiwari vishuals...@yahoo.co.in [firebird-support] 
Hi Paul,
I am getting below error while executing the trigger you shared. May be because 
of new FB version? I am executing using FlamRobin tool.
Please see error below:
*** IBPP::SQLException ***Context: Statement::Prepare( create trigger before 
update on Table_Nameasbeginif (new.col3 is distinct from old.col3)then new.col5 
= current_timestamp )Message: isc_dsql_prepare failed
SQL Message : -104can't format message 13:896 -- message file 
C:\Windows\system32\firebird.msg not found
Engine Code    : 335544569Engine Message :Dynamic SQL ErrorSQL error code = 
-104Token unknown - line 1, column 23update
 

On Wednesday, 9 August 2017 3:15 PM, "Paul Vinkenoog p...@vinkenoog.nl 
[firebird-support]"  wrote:
 

     Hello Vishal,

> I have one table say "MyTable", which has five columns, say Col1,
> Col2,...,Col5 and it has 10 rows. Col5 is of Timestamp.
> 
> My issue is, whenever I am updating Col3, that time, only for that row
> of Col5, Timestamp value should be updated to the current timestamp.
> 
> What would be the best option for this?
> 
> If trigger is the best way then how would I do it? As I never worked
> on Triggers.

Yes, a trigger is definitely the way to go, e.g. like this:

set term #;
 create trigger before update on MyTable
 as
 begin
 if (new.col3 is distinct from old.col3)
 then new.col5 = current_timestamp;
 end#
 set term ;#

If col3 is non-nullable you can simply use "new.col3 <> old.col3" in the 
test.

Mind you, an explicit update that re-enters the existing value in col3 
won't cause col5 to be updated!

HTH,

Paul Vinkenoog

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Re: [firebird-support] Re: On Updating One Column Value, Update Time Stamp in Another Column

2017-08-09 Thread Paul Vinkenoog p...@vinkenoog.nl [firebird-support] 
Hello Vishal,

> I have one table say "MyTable", which has five columns, say Col1,
> Col2,...,Col5 and it has 10 rows. Col5 is of Timestamp.
> 
> My issue is, whenever I am updating Col3, that time, only for that row
> of Col5, Timestamp value should be updated to the current timestamp.
> 
> What would be the best option for this?
> 
> If trigger is the best way then how would I do it? As I never worked
> on Triggers.

Yes, a trigger is definitely the way to go, e.g. like this:

   set term #;
   create trigger before update on MyTable
   as
   begin
 if (new.col3 is distinct from old.col3)
   then new.col5 = current_timestamp;
   end#
   set term ;#

If col3 is non-nullable you can simply use "new.col3 <> old.col3" in the 
test.

Mind you, an explicit update that re-enters the existing value in col3 
won't cause col5 to be updated!

HTH,

Paul Vinkenoog