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(SOLVED) DBF add fields into existing table
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Topic: (SOLVED) DBF add fields into existing table (Read 2891 times)
xinyiman
Hero Member
Posts: 2256
(SOLVED) DBF add fields into existing table
«
on:
February 13, 2019, 11:37:18 am »
Hi I want to add a column to my existing table in a dbf file. What am I doing wrong?
Code: Pascal
[Select]
[+]
[-]
var
MyDBF
:
TDBF
;
dbDefs
:
TDbfFieldDefs
;
begin
MyDBF
:
=
TDBF
.
Create
(
nil
)
;
MyDBF
.
FilePath
:
=
Self
.
PAthDBF
;
MyDBF
.
TableName
:
=
Self
.
TableNameDBF
;
if
MyDBF
.
FindField
(
'ELAB'
)
=
nil
then
begin
// create new field list
MyDBF
.
Exclusive
:
=
True
;
dbDefs
:
=
TDbfFieldDefs
.
Create
(
nil
)
;
try
dbDefs
.
Assign
(
MyDBF
.
DbfFieldDefs
)
;
dbDefs
.
Add
(
'ELAB'
,
ftString
,
1
)
;
MyDBF
.
RestructureTable
(
dbDefs
,
true
)
;
finally
dbDefs
.
Free
;
end
;
end
;
MyDBF
.
Open
;
MyDBF
.
Close
;
«
Last Edit: February 14, 2019, 08:40:41 am by xinyiman
»
Logged
Win10, Ubuntu and Mac
Lazarus: 2.1.0
FPC: 3.3.1
Handoko
Hero Member
Posts: 5158
My goal: build my own game engine using Lazarus
Re: DBF add fields into existing table
«
Reply #1 on:
February 13, 2019, 12:22:49 pm »
I have code to add dbf column. I copy/paste and modify a bit to suit your case:
Code: Pascal
[Select]
[+]
[-]
function
FieldIndex
(
aDBF
:
TDBF
;
const
strField
:
string
)
:
Integer
;
var
i
:
Integer
;
begin
Result
:
=
-
1
;
for
i
:
=
0
to
(
aDBF
.
DbfFieldDefs
.
Count
-
1
)
do
if
(
aDBF
.
DbfFieldDefs
.
Items
[
i
]
.
FieldName
=
strField
)
then
begin
Result
:
=
i
;
Exit
;
end
;
end
;
//...
var
MyDBF
:
TDBF
;
dbDefs
:
TDbfFieldDefs
;
dbDef
:
TDbfFieldDef
;
isNew
:
Boolean
;
begin
MyDBF
:
=
TDBF
.
Create
(
nil
)
;
MyDBF
.
FilePath
:
=
'the_path_to_the_location'
;
MyDBF
.
TableName
:
=
'the_file_name'
;
MyDBF
.
Open
;
dbDefs
:
=
TDbfFieldDefs
.
Create
(
nil
)
;
dbDefs
.
Assign
(
MyDBF
.
DbfFieldDefs
)
;
isNew
:
=
False
;
if
FieldIndex
(
'ELAB'
)
<
0
then
begin
isNew
:
=
True
;
dbDef
:
=
dbDefs
.
AddFieldDef
;
dbDef
.
FieldName
:
=
'ELAB'
;
dbDef
.
Type
:
=
ftString
;
dbDef
.
Size
:
=
1
;
dbDef
.
Required
:
=
False
;
end
;
MyDBF
.
Close
;
if
isNew
then
MyDBF
.
RestructureTable
(
dbDefs
,
True
)
;
dbDefs
.
Free
;
MyDBF
.
Free
end
;
«
Last Edit: February 13, 2019, 12:36:02 pm by Handoko
»
Logged
xinyiman
Hero Member
Posts: 2256
Re: DBF add fields into existing table
«
Reply #2 on:
February 14, 2019, 08:40:29 am »
I replace
dbDef.Type := ftString;
with
dbDef.FieldType := ftString;
But run correctly. Thank you very much.
Logged
Win10, Ubuntu and Mac
Lazarus: 2.1.0
FPC: 3.3.1
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(SOLVED) DBF add fields into existing table
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