rl_dbpack_unit.pas

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unit rl_dbpack_Unit;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DBITYPES, DBIPROCS, DBIERRS, db, dbtables, StdCtrls;
type
  Trl_dbpack = class(TForm)
    Button1: TButton;
    tb_zk: TTable;
    tb_ls: TTable;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  rl_dbpack: Trl_dbpack;

implementation

{$R *.dfm}
// Pack a Paradox or dBASE table
// The table must be opened exclusively 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 not Table.Active then
    raise EDatabaseError.Create('Table must be opened to pack');
  if not Table.Exclusive 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;

procedure Trl_dbpack.Button1Click(Sender: TObject);
begin
  tb_zk.Open;
  PackTable(tb_zk);
  tb_zk.Close;
  tb_ls.open;
  PackTable(tb_ls);
  tb_ls.Close;
  showmessage('数据压缩成功！请返回');
  close;
end;

end.