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ParamByName

Posted on 2001-07-08
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Last Modified: 2008-02-01
Why does this use of ParaByName give me an generel SQL error.
QryLocal.Close;
QryLocal.SQL.Text := 'SELECT * FROM :TABLENAME';
QryLocal.ParamByName('TABLENAME').AsString := 'TEST';
QryLocal.Open;

when this works fine
QryLocal.Close;
QryLocal.SQL.Text := 'SELECT * FROM TEST';
QryLocal.Open;
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Question by:glx2k
2 Comments
 
LVL 3

Expert Comment

by:MarcG
ID: 6262922
I only use Params if I have a fixed SQL.text ( I set it in the graphical query component), and after entering the sql.text with param you have to set the right param type with clicking on params in explorer.
Never tried with runtime queries but might be you have to set the param type there too.
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Accepted Solution

by:
Mohammed Nasman earned 50 total points
ID: 6262972
Hello

  ParamByName is used for fields name not for table names
  if you want to access to table name directly (not from alias", put the table in the double qutoation as following

QryLocal.Close;
QryLocal.SQL.Text := 'SELECT * FROM "Test.db"';
QryLocal.Open;

or if you want to access table in found in variable use the following code

var
  S : String;
begin
  QryLocal.Close;
  S := 'Test.db';
  QryLocal.SQL.Text := 'select * from '+ S;
  QryLocal.open;
end;

Best regards
Mohammed Nasman
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