ایجاد فایل اکسس در برنامه

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سلام
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[مهدی کرامتی]

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In this tip I want to describe how you can in run-time CREATE a table
in MS Access database using DAO.


1. declare the variables:
var
access, db, td, recordset: Variant;

2. declare the array of consts with data type mappings
(between Delphi field types and DAO field types)

arrMDBTypes: array[TFieldType] of Integer =
({dbText} 10 {ftUnknown},
{dbText} 10 {ftString},
{dbInteger} 3 {ftSmallint},
{dbLong} 4 {ftInteger},
{dbInteger} 3 {ftWord},
{dbBoolean} 1 {ftBoolean},
{dbDouble} 7 {ftFloat},
{dbCurrency} 5 {ftCurrency},
{dbDouble} 7 {ftBCD},
{dbDate} 8 {ftDate},
{dbDate} 8 {ftTime},
{dbDate} 8 {ftDateTime},
{dbLongBinary} 11 {ftBytes},
{dbLongBinary} 11 {ftVarBytes},
{dbInteger} 3 {ftAutoInc},
{dbLongBinary} 11 {ftBlob},
{dbMemo} 12 {ftMemo},
{dbLongBinary} 11 {ftGraphic},
{dbMemo} 12 {ftFmtMemo},
{dbLongBinary} 11 {ftParadoxOle},
{dbLongBinary} 11 {ftDBaseOle},
{dbBinary} 9 {ftTypedBinary},
{dbText} 10 {ftCursor}
{$IFDEF VER120}
,
{dbText} 10 {ftFixedChar},
{dbText} 10 {ftWideString},
{dbBigInt} 16 {ftLargeint},
{dbText} 10 {ftADT},
{dbText} 10 {ftArray},
{dbText} 10 {ftReference},
{dbText} 10 {ftDataSet}
{$ELSE}
{$IFDEF VER125}
,
{dbText} 10 {ftFixedChar},
{dbText} 10 {ftWideString},
{dbBigInt} 16 {ftLargeint},
{dbText} 10 {ftADT},
{dbText} 10 {ftArray},
{dbText} 10 {ftReference},
{dbText} 10 {ftDataSet}

{$ELSE}
{$IFDEF VER130}
,
{dbText} 10 {ftFixedChar},
{dbText} 10 {ftWideString},
{dbBigInt} 16 {ftLargeint},
{dbText} 10 {ftADT},
{dbText} 10 {ftArray},
{dbText} 10 {ftReference},
{dbText} 10 {ftDataSet},
{dbLongBinary} 11 {ftOraBlob},
{dbLongBinary} 11 {ftOraClob},
{dbText} 10 {ftVariant},
{dbText} 10 {ftInterface},
{dbText} 10 {ftIDispatch},
{dbGUID} 15 {ftGuid}
{$ENDIF}
{$ENDIF}
{$ENDIF}
);


3. load a DAO:
try
access := GetActiveOleObject('DAO.DBEngine.35');
except
access := CREATEOleObject('DAO.DBEngine.35');
end;

4. open a database
try
db := access.OpenDatabase(yourDatabaseName);
except
exit
end;

5. CREATE a new table in opened database
td := db.CREATETableDef(yourTableName, 0, '', '');

6. add a field descriptions in table
td.Fields.Append(td.CREATEField(strFieldName, arrMDBTypes
[intDataType],
Size));

for example
td.Fields.Append(td.CREATEField('ID', arrMDBTypes[intDataType],
Size));
td.Fields.Append(td.CREATEField('NAME', arrMDBTypes[intDataType],
Size));

7. add a table definition in table list
db.TableDefs.Append(td);

8. open the CREATEd table in database
recordset := db.OpenTable(yourTableName, 0);

9. append the new record in opened table
recordset.AddNew;

10. change the field values
curField := recordset.Fields[0].Value := 1;
curField := recordset.Fields[1].Value := 'First record';

11. post the new record
recordset.Update(dbUpdateRegular, False);
where
const
dbUpdateRegular = 1;

12. close a recordset

13. close a database
db.Close;

14. destroy a DAO
access := UnAssigned;
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