Question

How to create a view using a stored procedure in Firebird

Asked by: Skygizmo

Hi All,
I hope this post finds you well.

I need to do something like this using Delphi 7 and Firebird 2.0:

Create this view by calling a stored procedure from my application

CREATE VIEW VW_THEY_OWE_ME(
RecordID,
YouOweMe)
AS
SELECT
VW_PRE_TOTAL.RecordID,
VW_PRE_TOTAL. TotalDue YouOweMe
FROM
VW_PRE_TOTAL
where
VW_PRE_TOTAL.TotalDue BETWEEN X and Y //Note: X and Y are parameters

Then I want the client refer to it and use it for a bit.

Then I want to call another procedure to drop it.

Can this be done? Can you provide an example?

There is a long reason why I want to do it this way. If explaining will help, I'll post it.

Thanks for all of your help.

John Ullom

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Asked On
2009-05-23 at 23:50:55ID24434034
Tags

firebird view stored porcedure

Topics

Interbase / Firebird Database

,

Delphi Database

Participating Experts
1
Points
250
Comments
8

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Answers

 

by: NickUpsonPosted on 2009-05-24 at 03:14:13ID: 24461105

You need to find another way, creating and dropping ddl such as views at runtime is a bad idea, it can cause all kinds of issues

 

by: SkygizmoPosted on 2009-05-24 at 10:20:41ID: 24462244

Thanks for reply. Could I use a stored procedure to select the records the view would have selected and then return the result set to the Client?

Thans!

 

by: NickUpsonPosted on 2009-05-24 at 10:22:18ID: 24462250

yes, you can have a selectable stored proc

you just use it as "select a,b from myproc(param1, param2)"

 

by: SkygizmoPosted on 2009-05-24 at 10:30:06ID: 24462268

Ok, that sounds better. Can you provide an example that would show how the selectable stored procedure would look?

 

by: NickUpsonPosted on 2009-05-24 at 11:12:30ID: 24462397

create or ALTER PROCEDURE PR_OSIDENT_LOG (SOSIDENT Integer)
returns (SRC        Char(3),
         OSIDENT    Integer,
         OSCONNECT  Integer,
         BASEIDENT  Integer,
         MSG        Smallint,
         MSGLEN     Smallint,
         PAYLOAD    Char(64),
         PAYLOADLEN Smallint,
         DATA1      Integer,
         RECORD_DT  TIMESTAMP,
         RSSI       Smallint,
         NUMERRORS  Smallint,
         TMODEUL    Smallint,
         TMODEDL    Smallint,
         RECOMB     Smallint)
AS 
 
begin
 
    for select SL.SRC, SL.OSIDENT, SL.OSCONNECT, SL.BASEIDENT, SL.MSG, SL.MSGLEN, SL.PAYLOAD, SL.PAYLOADLEN, SL.DATA1,
                SL.WHENSAVED, SL.RSSI, SL.NUMERRORS, SL.TMODEUL, SL.TMODEDL, SL.RECOMBINATIONS
    from TBLSYSMSGLOG SL
    where SL.OSIDENT = :SOSIDENT
    order by SL.ID
    into :SRC, :OSIDENT, :OSCONNECT, :BASEIDENT, :MSG, :MSGLEN, :PAYLOAD, :PAYLOADLEN, :DATA1,
          :RECORD_DT, :RSSI, :NUMERRORS, :TMODEUL, :TMODEDL, :RECOMB
    do
    begin
        suspend;
    end
end^
                                              
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by: SkygizmoPosted on 2009-05-24 at 11:26:50ID: 24462440

What does the into part do? Does it insert the values int the result set that is returned?


What is this part? Is it require or is it specific to the example provided?        
    do
    begin
        suspend;
    end

 

by: SkygizmoPosted on 2009-05-24 at 12:30:47ID: 31584786

Thanks I got it!

 

by: NickUpsonPosted on 2009-05-24 at 14:18:47ID: 24463075

the into part specifies the variables to received the dataset

do
   begin
       suspend;
   end

is required, its the loop through the data, suspend returns the current dataset

 

20120131-EE-VQP-002

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