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Firebird+Delphi 7 Problem with 0 results found

MerlaP83
MerlaP83 asked
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Last Modified: 2013-12-09
Hey all,

Provided some code before which I use to update a record in my Firebird database; however, sometimes the main_boost.caption isn't found in the db (which is correct, not every entry is in the db) - and if a record isn't found then nothing should happen, if the record is found however then the Edit/Post procedure should begin.
Lag.close;
Lag.sql.text := 'select * from lag where klubb = '''+main_boost.caption+'''';
Lag.Open;
Lag.First;
Lag.Edit;
Lag['Off'] := inttostr(strtoint(Lag['Off']) - 3);
Lag['Def'] := inttostr(strtoint(Lag['Def']) - 3);
Lag.Post;
end;

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Geert GOracle dba
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Top Expert 2009

Commented:
have you ever heard of a update statement ?


Lag.SQL.Text := 
  'update lag                       '+
  'set Off = Off - 3, Def = Def - 3 '+
  'where klubb = :klubb             ';
Lag.Prepare;
Lag.ParamByName('klubb').AsString := main_boost.caption;
Lag.ExecuteSql;
// number of changed records:
ShowMessage(Format('Affected records: %d ', [Lag.AffectedRecords]));

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Oracle dba
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Top Expert 2009
Commented:
This one is on us!
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Commented:
Thank you.

Which solution would you prefer?

The first solution gave me Undeclared identifier on Prepare, Parambyname, ExecuteSQL and AffectedRecords (Using Firebird+Zeos). The second solution worked perfect.
Geert GOracle dba
CERTIFIED EXPERT
Top Expert 2009

Commented:
well most certainly try and do as many changes with a update statement
don't have zeos here atm, i'll have to check that tomorrow ...
i'm guessing:
ParamByName('X') should be Parameters.ParamByName('X)
ExecuteSql should be Execute
...

but this is for sample 1:
send script to server (some 100 bytes over network)
let server execute script
server returns number of records (some 10 bytes over network)

sample 2:
send script to server (some 100 bytes over network)
server returns the dataset (if any, probably 100 bytes per record)
dataset copies this set to memory
for each record
  you check the record in memory
  you edit the data locally
  you tell the server the record changed (probably 100 bytes per record)
  server returns number of records affected (some 10 bytes over network)

do you understand why you need to go for script 1 ?
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