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No fields defined?

Posted on 1998-05-27
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Last Modified: 2010-05-03
Why the last line in the following code causes error:
No fields defined - cannot append Tabledef of Index.

    Set NewDB = CreateDatabase("c:\tem\try.mdb", dbLangGeneral)
    Set NewTbl = NewDB.CreateTableDef("table1")
    Set Ind1 = NewTbl.CreateIndex("index1")
    Ind1.Primary = True
    Set F1 = Ind1.CreateField("field1")
    Ind1.Fields.Append F1
    NewTbl.Indexes.Append Ind1
    NewDB.TableDefs.Append NewTbl
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Question by:victorlong
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Dalin earned 50 total points
ID: 1461810
victorlong,
Your Set F1 = Ind1.CreateField("field1")
should be
Set F1 = NewTb1.CreateField("field1")
NewTb1.Fields.Append F1  

Regards
Dalin
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Author Comment

by:victorlong
ID: 1461811
Hi Dalin.

>   Your Set F1 = Ind1.CreateField("field1")
>   should be
>   Set F1 = NewTb1.CreateField("field1")
>   NewTb1.Fields.Append F1

That is came from a book! I will check again though.
But, if we change the line, how can VB know "field1" has "index1"?  
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Expert Comment

by:Dalin
ID: 1461812
victorlong,
Set F1 = Ind1.CreateField("field1") only create a field to the index object, and it does not create it to your table, that's why you have the error.
To create Index, I would use
Set Ind1 = NewTbl.CreateIndex("Field1")
Ind1.Primary = True
Ind1.Unique = True ' if You want to

regards
Dalin

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Author Comment

by:victorlong
ID: 1461813
Hi Dalin.

Getting confused....I think an example may be more helpful. Can you add something or change something in the following code so that the database NewDB can be used? Many thanks.

 Set NewDB = CreateDatabase("c:\tem\try.mdb", dbLangGeneral)
 Set NewTbl = NewDB.CreateTableDef("table1")
 Set Ind1 = NewTbl.CreateIndex("index1")
 Ind1.Primary = True
 Set F1 = Ind1.CreateField("field1")
 Ind1.Fields.Append F1
 NewTbl.Indexes.Append Ind1
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Expert Comment

by:Dalin
ID: 1461814
victorlong,
Sorry that I was not able to get back to you yesterday.
Which version of VB are you working with?
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Author Comment

by:victorlong
ID: 1461815
Hi Dalin.

I think I understan now....that is not my fault :-)
I always thought
Set F1 = Ind1.CreateField("field1")
is "create" a field. In fact it just tell VB that a field has an index. The field may existed before above code!
In English, "create" means something is bringed to the world but before "create" it not existed.....

This time I may confuse you :-)
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LVL 9

Expert Comment

by:Dalin
ID: 1461816
victorlog,
You need to "create" the field for both TableDef and Index..
I am sorry that I was not more clear about it. Glad you get it.
If you have additional questions, let me know. I will try my best to be more prompt (I was mostly out of my office yesterday).
Good luck in your project.
Dalin
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