搂主试试下面函数Example 1: 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 This function will also regenerate all out-of-date indexes (maintained indexes).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 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 TForm1.Button1Click(Sender: TObject); begin with Query1 do begin DatabaseName := 'DBDemos'; with SQL do begin Clear; Add('CREATE TABLE "Tbl.dbf" (ID CHAR(5),'); Add('Name CHAR(255),'); Add('PRIMARY KEY(ID))'); ExecSQL; Clear; Add('CREATE INDEX ByName ON "Tbl.dbf" (Name)'); ExecSQL; end; end; end;
(
LAST_NAME CHAR(20),
FIRST_NAME CHAR(15),
SALARY NUMERIC(10,2),
DEPT_NO SMALLINT
)
(
LAST_NAME CHAR(20),
FIRST_NAME CHAR(15),
SALARY NUMERIC(10,2),
DEPT_NO SMALLINT
)
// 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 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;
ADOCOMMAND1.COMMANDTEXT:='PACK 123.DBF';
ADOCOMMAND1.EXECUTE;
再试一下
begin
with Query1 do
begin
DatabaseName := 'DBDemos';
with SQL do
begin
Clear;
Add('CREATE TABLE "Tbl.dbf" (ID CHAR(5),');
Add('Name CHAR(255),');
Add('PRIMARY KEY(ID))');
ExecSQL;
Clear;
Add('CREATE INDEX ByName ON "Tbl.dbf" (Name)');
ExecSQL;
end;
end;
end;
多谢这位高手,感谢你为我这两个问题多次的回答,再次表示感谢!下午吃完饭后结帐!