XProfan

Public Sub Test()
Dim i As Integer
Dim fieldList As String
For i = 0 To CurrentDb.TableDefs("TabellenName").Fields.Count - 1
fieldList = fieldList & CurrentDb.TableDefs("Fragen").Fields(i).Name & ";"
Next i
MsgBox fieldList
End Sub

window 600,600
def %SQL_HANDLE_STMT 3
def %SQL_NTS        -3
var File$="D:\Archive\Einstellungen\Alcatel 701\Nachricht.mdb"
var Name$="Inbox"
var Init$="Driver={Microsoft Access Driver (*.mdb)};Dbq="+File$
var Command$="SELECT TOP 1 * FROM "+Name$
db("SQLInit",Init$)
declare Handle&
external("odbc32.dll","SQLAllocHandle",%SQL_HANDLE_STMT,&SQLDBC,addr(Handle&))
external("odbc32.dll","SQLExecDirect",Handle&,Command$,%SQL_NTS)
declare Count&
external("odbc32.dll","SQLNumResultCols",Handle&,addr(Count&))'--Anzahl Felder
declare Text#:dim Text#,255
declare a&,b&,c&,d&,e&

whileloop 1,Count&

    cls
    external("odbc32.dll","SQLDescribeCol",Handle&,&loop,Text#,255,addr(a&),addr(b&),addr(c&),addr(d&),addr(e&))
    external("oleaut32.dll","VarI4FromI2",b&,addr(b&))'--Umwandlung von SHORT nach LONG
    print "Index         ",&loop
    print "Name          ",string$(Text#,0)
    print "NameLength    ",a&
    print "DataType      ",b&
    print "ColumnSize    ",c&
    print "DecimalDigits ",d&
    print "Nullable      ",e&
    print
    print "<ENTER>"
    waitkey

endwhile

print "Fertig"
external("odbc32.dll","SQLFreeHandle",%SQL_HANDLE_STMT,Handle&)
db("SQLDone")
dispose Text#
waitkey
end
'
'Hinweis:
'DataType ist vom Typ SQLSMALLINT
'Bei negativen Werten wird darum beim Auslesen das Vorzeichen-Bit nicht korrekt umgesetzt!
'Umwandlung von SHORT nach LONG ist nötig!
SQL_UNKNOWN_TYPE	  =0;
SQL_CHAR            =1;
SQL_NUMERIC         =2;
SQL_DECIMAL         =3;
SQL_INTEGER         =4;
SQL_SMALLINT        =5;
SQL_FLOAT           =6;
SQL_REAL            =7;
SQL_DOUBLE          =8;
SQL_DATETIME        =9;
SQL_TIME            =10;
SQL_TIMESTAMP       =11;
SQL_VARCHAR         =12;
SQL_LONGVARCHAR    =(-1);
SQL_BINARY         =(-2);
SQL_VARBINARY      =(-3);
SQL_LONGVARBINARY  =(-4);
SQL_BIGINT         =(-5);
SQL_TINYINT        =(-6);
SQL_BIT            =(-7);

window 600,600
 $H Windows.ph
 $H ocx3a.ph
 $I ocx3a.inc
ocxInit()
var File$="D:\Archive\Einstellungen\Alcatel 701\Nachricht.mdb"
var Name$="Inbox"
var Connect$="Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+File$
var Command$="Select TOP 1 * from "+Name$
var Rec&=ocxCreate("ADODB.Recordset")
ocxMethod(Rec&,"Open",Command$,Connect$)
var Fields&=ocxget(Rec&,"Fields")'---"Fields" ohne Parameter: Fields-Collection
var Count%=ocxGet(Fields&,"Count")'--Anzahl Felder in Collection
ocxRelease(Fields&)
declare Feld&

whileloop 0,Count%-1

    cls
    Feld&=ocxGet(Rec&,"Fields",&loop)'--"Fields" mit Parameter: einzelne Felder nach 0-Index
    print "Index      : ",&loop
    print "Name       : ",ocxGet(Feld&,"Name")
    print "Type       : ",ocxGet(Feld&,"Type")
    print "Value      : ",left$(ocxGet(Feld&,"Value"),40)'--Inhalt auf 40 Zeichen gekürzt
    print "DefinedSize: ",ocxGet(Feld&,"DefinedSize")'------Deklarierte Größe
    print "ActualSize : ",ocxGet(Feld&,"ActualSize")'-------Verwendete Größe
    print
    print "<ENTER>"
    ocxRelease(Feld&)
    waitkey

endwhile

ocxMethod(Rec&,"Close")
ocxRelease(Rec&)
ocxDeInit()
print "Fertig"
waitkey
end
'Werte für DataTypen bei MSDN unter
'https://msdn.microsoft.com/en-us/library/windows/desktop/ms675318(v=VS.85).aspx