Packing Paradox TTables in D3 Standard

How do I pack and regenerate indexes on Paradox tables using Delphi 3 Standard edition. I know it can be done in Database Desktop but how do I achieve it at runtime.
I can't find any reference to it in the help files.

I'm probably missing something really simple but I'm tearing my hair out here.

Please help me people !!
elkiorsAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

ronit051397Commented:
From Borland Documenatation:
http://www.inprise.com/devsupport/bde/bdeapiex/dbidorestructure.html

Example 2: Pack a Paradox or dBASE table.

           This example will pack a Paradox or dBASE table therfore removing already deleted rows in a table.
           This function will also regenerate all out-of-date indexes (maintained indexes).
           This example uses the following input:
           PackTable(Table1)
           The function is defined as follows:

           // Pack a Paradox or dBASE table
           // The table must be opened execlusively before calling this function...
           procedure PackTable(Table: TTable);
           var
             Props: CURProps;
             hDb: hDBIDb;
             TableDesc: CRTblDesc;

           begin
             // Make sure the table is open exclusively so we can get the db handle...
             if Table.Active = False then
               raise EDatabaseError.Create('Table must be opened to pack');
             if Table.Exclusive = False then
               raise EDatabaseError.Create('Table must be opened exclusively to pack');

             // Get the table properties to determine table type...
             Check(DbiGetCursorProps(Table.Handle, Props));

             // If the table is a Paradox table, you must call DbiDoRestructure...
             if Props.szTableType = szPARADOX then
             begin
               // Blank out the structure...
               FillChar(TableDesc, sizeof(TableDesc), 0);
               //  Get the database handle from the table's cursor handle...
               Check(DbiGetObjFromObj(hDBIObj(Table.Handle), objDATABASE, hDBIObj(hDb)));
               // Put the table name in the table descriptor...
               StrPCopy(TableDesc.szTblName, Table.TableName);
               // Put the table type in the table descriptor...
               StrPCopy(TableDesc.szTblType, Props.szTableType);
               // Set the Pack option in the table descriptor to TRUE...
               TableDesc.bPack := True;
               // Close the table so the restructure can complete...
               Table.Close;
               // Call DbiDoRestructure...
               Check(DbiDoRestructure(hDb, 1, @TableDesc, nil, nil, nil, FALSE));
             end
             else
               // If the table is a dBASE table, simply call DbiPackTable...
               if Props.szTableType = szDBASE then
                 Check(DbiPackTable(Table.DBHandle, Table.Handle, nil, szDBASE, TRUE))
               else
                 // Pack only works on PAradox or dBASE; nothing else...
                 raise EDatabaseError.Create('Table must be either of Paradox or dBASE ' +
                          'type to pack');

             Table.Open;
           end;
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
elkiorsAuthor Commented:
Please bear with me while I check out your answer, I'm a little pushed for time for checking it out. Give me a couple of days and I'll Accept or Reject.
0
ronit051397Commented:
OK, if you have problems then before the first Check(...
write:                                Check(dbiInit(Nil)); //initializing the BDE
and on the end write:       DbiExit;               //freening resources
0
Cloud Class® Course: Amazon Web Services - Basic

Are you thinking about creating an Amazon Web Services account for your business? Not sure where to start? In this course you’ll get an overview of the history of AWS and take a tour of their user interface.

elkiorsAuthor Commented:
Ronit:

I'm sorry but I can't get this to compile, if you could make this a stand alone unit that I can just add to my projects it would be great.

At the moment it seems to be stopping on var types declared at the front of the PackTable procedure, I've tried to do a search for them in the help files so that I can trace the standard units requirements but no luck so far. Unfortunately, I'm still a novice, so the really low-level stuff like this is a bit beyond me.

I've upped the points as much as I can to help you consider the extra bit of effort needed on your part

thanx in advance for all your help

regards

elkiors



unit dbPack;

interface

procedure PackTable(Table: TTable);

implementation

// This example will pack a Paradox or dBASE table therfore removing already deleted rows in a table.
// This function will also regenerate all out-of-date indexes (maintained indexes).
// This example uses the following input:
// PackTable(Table1)
// The function is defined as follows:

// Pack a Paradox or dBASE table
// The table must be opened execlusively before calling this function...
procedure PackTable(Table: TTable);
var
  Props: CURProps;
  hDb: hDBIDb;
  TableDesc: CRTblDesc;

begin
  // Make sure the table is open exclusively so we can get the db handle...
  if Table.Active = False then raise EDatabaseError.Create('Table must be opened to pack');
  if Table.Exclusive = False then raise EDatabaseError.Create('Table must be opened exclusively to pack');

  // Get the table properties to determine table type...
  Check(DbiGetCursorProps(Table.Handle, Props));

  // If the table is a Paradox table, you must call DbiDoRestructure...
  if Props.szTableType = szPARADOX then
  begin
    // Blank out the structure...
    FillChar(TableDesc, sizeof(TableDesc), 0);
    //  Get the database handle from the table's cursor handle...
    Check(DbiGetObjFromObj(hDBIObj(Table.Handle), objDATABASE, hDBIObj(hDb)));
    // Put the table name in the table descriptor...
    StrPCopy(TableDesc.szTblName, Table.TableName);
    // Put the table type in the table descriptor...
    StrPCopy(TableDesc.szTblType, Props.szTableType);
    // Set the Pack option in the table descriptor to TRUE...
    TableDesc.bPack := True;
    // Close the table so the restructure can complete...
    Table.Close;
    // Call DbiDoRestructure...
    Check(DbiDoRestructure(hDb, 1, @TableDesc, nil, nil, nil, FALSE));
  end
  else
    // If the table is a dBASE table, simply call DbiPackTable...
    if Props.szTableType = szDBASE then
      Check(DbiPackTable(Table.DBHandle, Table.Handle, nil, szDBASE, TRUE))
    else
      // Pack only works on PAradox or dBASE; nothing else...
      raise EDatabaseError.Create('Table must be either of Paradox or dBASE ' + 'type to pack');
        Table.Open;
end;

end.

0
ronit051397Commented:
Did you add to the uses --->BDE, DBTables,DB?
0
elkiorsAuthor Commented:
thanx ronit, just what i need
the final compilable unit is listed below so anyone else can use it without any need to modify it further.


---------------------------------
unit dbPack;

interface

uses BDE, DBTables, DB, sysutils;

procedure PackTable(Table: TTable);

implementation

// This example will pack a Paradox or dBASE table therfore removing already deleted rows in a table.
// This function will also regenerate all out-of-date indexes (maintained indexes).
// This example uses the following input:
// PackTable(Table1)
// The function is defined as follows:

// Pack a Paradox or dBASE table
// The table must be opened execlusively before calling this function...
procedure PackTable(Table: TTable);
var
  Props: CURProps;
  hDb: hDBIDb;
  TableDesc: CRTblDesc;

begin
  // Make sure the table is open exclusively so we can get the db handle...
  if Table.Active = False then raise EDatabaseError.Create('Table must be opened to pack');
  if Table.Exclusive = False then raise EDatabaseError.Create('Table must be opened exclusively to pack');

  // Get the table properties to determine table type...
  Check(DbiGetCursorProps(Table.Handle, Props));

  // If the table is a Paradox table, you must call DbiDoRestructure...
  if Props.szTableType = szPARADOX then
  begin
    // Blank out the structure...
    FillChar(TableDesc, sizeof(TableDesc), 0);
    //  Get the database handle from the table's cursor handle...
    Check(DbiGetObjFromObj(hDBIObj(Table.Handle), objDATABASE, hDBIObj(hDb)));
    // Put the table name in the table descriptor...
    StrPCopy(TableDesc.szTblName, Table.TableName);
    // Put the table type in the table descriptor...
    StrPCopy(TableDesc.szTblType, Props.szTableType);
    // Set the Pack option in the table descriptor to TRUE...
    TableDesc.bPack := True;
    // Close the table so the restructure can complete...
    Table.Close;
    // Call DbiDoRestructure...
    Check(DbiDoRestructure(hDb, 1, @TableDesc, nil, nil, nil, FALSE));
  end
  else
    // If the table is a dBASE table, simply call DbiPackTable...
    if Props.szTableType = szDBASE then
      Check(DbiPackTable(Table.DBHandle, Table.Handle, nil, szDBASE, TRUE))
    else
      // Pack only works on PAradox or dBASE; nothing else...
      raise EDatabaseError.Create('Table must be either of Paradox or dBASE ' + 'type to pack');
        Table.Open;
end;

end.
----------------------------------------------------

thanks once again,

enjoy the points,

c u on another thread.

elkiors (Darren)

0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Delphi

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.