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Loading schema
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This message was discovered on ASPFriends.com 'aspngdata' list.
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dave wanta (VIP)
Hi All,
How do I get a datable schema without loading all the data from the database? I need to do this for both OleDb and Sql. Specifically, I just need the column names of the resulting datatable.

I have a function that gets passed some sql or a stored procedure and returns a datatable. I'd like to provide the caller the capability to only return an empty datatable ( really, just the table column names only).

Is this possible?

Thanks a bunch!

--dave
Reply to this message...
 
    
Dan Wahlin
The easiest way is to do the following (I'm guessing there may be some
other tricks as well):

SELECT * FROM Customers WHERE 1=0

You can see an example of using this to load the schema into a DataSet
at the following URL:

http://www.xmlforasp.net/codebank/util/srcview.aspx?path=../../codebank/" target="_blank">http://www.xmlforasp.net/codebank/util/srcview.aspx?path=../../codebank/
System.Data/YahooStores/YahooStores.src
<http://www.xmlforasp.net/codebank/util/srcview.aspx?path=../../codebank
/System.Data/YahooStores/YahooStores.src&file=XmlImporter.cs&font=3>
&file=XmlImporter.cs&font=3

(watch for wrapping)

HTH,

Dan

Wahlin Consulting LLC

Microsoft MVP - ASP.NET

http://www.XMLforASP.Net <http://www.xmlforasp.net/> : #1 ASP.NET XML
Resource

XML
<http://www.amazon.com/exec/obidos/ASIN/0672320398/ref=ase_xmlforaspnetd
-20/104-7101530-2681531> for ASP.NET Developers by Dan Wahlin in
bookstores everywhere!

-----Original Message-----
From: dave wanta [mailto:Click here to reveal e-mail address]
Sent: Sunday, May 26, 2002 2:02 PM
To: aspngdata
Subject: [aspngdata] Loading schema

Hi All,

How do I get a datable schema without loading all the data from the
database? I need to do this for both OleDb and Sql. Specifically, I
just need the column names of the resulting datatable.

I have a function that gets passed some sql or a stored procedure and
returns a datatable. I'd like to provide the caller the capability to
only return an empty datatable ( really, just the table column names
only).

Is this possible?

Thanks a bunch!

--dave

| [aspngdata] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngdata.asp = JOIN/QUIT
| http://www.asplists.com/search = SEARCH Archives
Reply to this message...
 
    
Steve Sharrock (VIP)
You can also use the DataAdapter's FillSchema method to load a DataSet
with the table's schema. I don't know if this is more efficient than
Dan's method or not--I use both from time to time when I'm doing an
insert and don't do a select first.

DataSet ds = new DataSet();

da.FillSchema(ds, SchemaType.Source, "Listing");

Steve Sharrock
programmer / designer
www.sharkcode.com <http://www.sharkcode.com/>

-----Original Message-----
From: Dan Wahlin [mailto:Click here to reveal e-mail address]
Sent: Sunday, May 26, 2002 3:30 PM
To: aspngdata
Subject: [aspngdata] RE: Loading schema

The easiest way is to do the following (I'm guessing there may be some
other tricks as well):

SELECT * FROM Customers WHERE 1=0

You can see an example of using this to load the schema into a DataSet
at the following URL:

http://www.xmlforasp.net/codebank/util/srcview.aspx?path=../../codebank" target="_blank">http://www.xmlforasp.net/codebank/util/srcview.aspx?path=../../codebank/" target="_blank">http://www.xmlforasp.net/codebank/util/srcview.aspx?path=../../codebank" target="_blank">http://www.xmlforasp.net/codebank/util/srcview.aspx?path=../../codebank/
System.Data/YahooStores/YahooStores.src
<http://www.xmlforasp.net/codebank/util/srcview.aspx?path=../../codebank" target="_blank">http://www.xmlforasp.net/codebank/util/srcview.aspx?path=../../codebank
/System.Data/YahooStores/YahooStores.src&file=XmlImporter.cs&font=3>
&file=XmlImporter.cs&font=3

(watch for wrapping)

HTH,

Dan

Wahlin Consulting LLC

Microsoft MVP - ASP.NET

http://www.XMLforASP.Net <http://www.xmlforasp.net/> : #1 ASP.NET XML
Resource

XML
<http://www.amazon.com/exec/obidos/ASIN/0672320398/ref=ase_xmlforaspnetd
-20/104-7101530-2681531> for ASP.NET Developers by Dan Wahlin in
bookstores everywhere!

-----Original Message-----
From: dave wanta [mailto:Click here to reveal e-mail address]
Sent: Sunday, May 26, 2002 2:02 PM
To: aspngdata
Subject: [aspngdata] Loading schema

Hi All,

How do I get a datable schema without loading all the data from the
database? I need to do this for both OleDb and Sql. Specifically, I
just need the column names of the resulting datatable.

I have a function that gets passed some sql or a stored procedure and
returns a datatable. I'd like to provide the caller the capability to
only return an empty datatable ( really, just the table column names
only).

Is this possible?

Thanks a bunch!

--dave

| [aspngdata] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngdata.asp = JOIN/QUIT
| http://www.asplists.com/search = SEARCH Archives

| [aspngdata] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngdata.asp = JOIN/QUIT
| http://www.asplists.com/search = SEARCH Archives
Reply to this message...
 
    
Dan Wahlin
Actually..I like the FillSchema() method you mention better. I'd seen
that awhile back but never actually tried it out. Looks much cleaner.
:-)

Dan

Wahlin Consulting LLC

Microsoft MVP - ASP.NET

http://www.XMLforASP.Net <http://www.xmlforasp.net/> : #1 ASP.NET XML
Resource

XML
<http://www.amazon.com/exec/obidos/ASIN/0672320398/ref=ase_xmlforaspnetd
-20/104-7101530-2681531> for ASP.NET Developers by Dan Wahlin in
bookstores everywhere!

-----Original Message-----
From: Steve Sharrock [mailto:Click here to reveal e-mail address]
Sent: Sunday, May 26, 2002 4:49 PM
To: aspngdata
Subject: [aspngdata] RE: Loading schema

You can also use the DataAdapter's FillSchema method to load a DataSet
with the table's schema. I don't know if this is more efficient than
Dan's method or not--I use both from time to time when I'm doing an
insert and don't do a select first.

DataSet ds = new DataSet();

da.FillSchema(ds, SchemaType.Source, "Listing");

Steve Sharrock

programmer / designer

www.sharkcode.com <http://www.sharkcode.com/>

-----Original Message-----
From: Dan Wahlin [mailto:Click here to reveal e-mail address]
Sent: Sunday, May 26, 2002 3:30 PM
To: aspngdata
Subject: [aspngdata] RE: Loading schema

The easiest way is to do the following (I'm guessing there may be some
other tricks as well):

SELECT * FROM Customers WHERE 1=0

You can see an example of using this to load the schema into a DataSet
at the following URL:

http://www.xmlforasp.net/codebank/util/srcview.aspx?path=../../codebank" target="_blank">http://www.xmlforasp.net/codebank/util/srcview.aspx?path=../../codebank/" target="_blank">http://www.xmlforasp.net/codebank/util/srcview.aspx?path=../../codebank" target="_blank">http://www.xmlforasp.net/codebank/util/srcview.aspx?path=../../codebank/
System.Data/YahooStores/YahooStores.src
<http://www.xmlforasp.net/codebank/util/srcview.aspx?path=../../codebank" target="_blank">http://www.xmlforasp.net/codebank/util/srcview.aspx?path=../../codebank
/System.Data/YahooStores/YahooStores.src&file=XmlImporter.cs&font=3>
&file=XmlImporter.cs&font=3

(watch for wrapping)

HTH,

Dan

Wahlin Consulting LLC

Microsoft MVP - ASP.NET

http://www.XMLforASP.Net <http://www.xmlforasp.net/> : #1 ASP.NET XML
Resource

XML
<http://www.amazon.com/exec/obidos/ASIN/0672320398/ref=ase_xmlforaspnetd
-20/104-7101530-2681531> for ASP.NET Developers by Dan Wahlin in
bookstores everywhere!

-----Original Message-----
From: dave wanta [mailto:Click here to reveal e-mail address]
Sent: Sunday, May 26, 2002 2:02 PM
To: aspngdata
Subject: [aspngdata] Loading schema

Hi All,

How do I get a datable schema without loading all the data from the
database? I need to do this for both OleDb and Sql. Specifically, I
just need the column names of the resulting datatable.

I have a function that gets passed some sql or a stored procedure and
returns a datatable. I'd like to provide the caller the capability to
only return an empty datatable ( really, just the table column names
only).

Is this possible?

Thanks a bunch!

--dave

| [aspngdata] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngdata.asp = JOIN/QUIT
| http://www.asplists.com/search = SEARCH Archives

| [aspngdata] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngdata.asp = JOIN/QUIT
| http://www.asplists.com/search = SEARCH Archives

| [aspngdata] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngdata.asp = JOIN/QUIT
| http://www.asplists.com/search = SEARCH Archives
Reply to this message...
 
 
System.Data.Common.DataAdapter
System.Data.DataSet
System.Data.SchemaType




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