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sirmilt
Starting Member

USA
46 Posts
Posted - 03/10/2013 :  12:51:44  Show Profile  Reply with Quote
I am working on a Visual Basic project that utilizes three SQL Server tables. Each of the tables has an optional field for the year. The field designation in all 3 tables is NVarChar(4).

In 2 of the tables when the field is left blank and the record saved to the database the result is a blank field with a length of 0 in the table, which when tested in Visual Basic results in a field length of 0, exactly what I want. The third table, however, contains 4 spaces and a text length of 4 in Visual Basic.

The "Insert" code for all three tables is identical and I can't find any differences in the Visual Basic code which would account for this.

Can anyone help?

Milt

James K
Flowing Fount of Yak Knowledge

1511 Posts
Posted - 03/10/2013 :  12:58:57  Show Profile  Reply with Quote
I know you said all the columns are NVARCHAR(4), but check again - you can use the following code to check:
SELECT DATA_TYPE FROM INFORMATION_SCHEMA.[COLUMNS] 
WHERE TABLE_NAME = 'thirdtablename' AND COLUMN_NAME = 'Yearcolumname'
If it returns NCHAR, that is the issue; the data type needs to be NVARCHAR(4), not NCHAR(4)
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sirmilt
Starting Member

USA
46 Posts
Posted - 03/10/2013 :  17:20:10  Show Profile  Reply with Quote
Thank You,James for the suggestion,

I solved it by deleting he field in SQL Server and then reentering it. When I first layed out the database the field was NChar. Apparently when I changed it to NVarChar it didn't take, even tho the visible signs indicated that it did. I deleted the field, reentered with the new property and refreshed the database and it works fine now.


Milt
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Kamalaveni
Starting Member

1 Posts
Posted - 03/11/2013 :  00:11:40  Show Profile  Reply with Quote
Hi James,

i have read the reply which u have given for the question which is asked by sirmilt.

if ur motto is to give code to check the datatype of the column means u can give sp_help Table_name.. right..?

why u have given the code to retrieve from information_schema, is der any specific reason for dat..?

i am new to sql, please clarify my doubt..
]
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bandi
Flowing Fount of Yak Knowledge

India
1430 Posts
Posted - 03/11/2013 :  00:32:53  Show Profile  Reply with Quote
Hi Kamalaveni,

--James Post
SELECT DATA_TYPE FROM INFORMATION_SCHEMA.[COLUMNS]
WHERE TABLE_NAME = 'thirdtablename' AND COLUMN_NAME = 'Yearcolumname'

Here you can get only that specific column related datatype whereas sp_help will give you all the properties of each column in that table.. By seeing that again we have to search for specific column.. right?



--
Chandu
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