Re: How to get tables/views/columns in ODBC (& OleDb)
- From: David Thielen <thielen@xxxxxxxxxxxxx>
- Date: Mon, 25 Aug 2008 13:08:45 -0600
Thank you the GetOleDbSchemaTable call helps a bunch for OleDb. For
ODBC it looks like we're stuck with it being different for every
driver - which isn't much help when hitting a driver we haven't seen
before.
Oh well, it's a very old spec so it makes sense that it isn't that
complete.
thanks - dave
On Mon, 25 Aug 2008 07:49:21 GMT, jialge@xxxxxxxxxxxxxxxxxxxx
("Jialiang Ge [MSFT]") wrote:
Hello Dave,
The collection of DB schema information VARIES in different providers and
drivers. The common schema collection that are supported by all the managed
providers is documented at:
Understanding the Common Schema Collections
http://msdn.microsoft.com/en-us/library/ms254501(VS.80).aspx
But this collection does not include your requested information like all
user tables in a DB. To get the detailed schema info, we would need to
first decide the DB (SQL Server/Oracle/Access, etc) and the provider
(OLEDB/ODBC/ Microsoft .NET Framework Data Provider). For each combination,
we have provider-specific schema collections:
Understanding the Provider-Specific Schema Collections
http://msdn.microsoft.com/en-us/library/ms254969(VS.80).aspx
Some of them provide restricted collection of info; some provide the
details that may meet our needs.
So back to your questions:
1. how do I get the following from ODBC and OleDb in a way that will work
on all databases
This is hard to do because each provider supplies different set of schema
info.
2. how do I do it for Sql Server 2000, Sql Server 2005, and Access
OLEDB provider for SQL server may better fit the need.
(see "Microsoft SQL Server OLEDB Provider" and "Microsoft Jet OLEDB
Provider" sections in the article
http://msdn.microsoft.com/en-us/library/ms254969(VS.80).aspx).
1) Enumerate all user tables in a database.
We can call conn.GetSchema("Tables"); and filter the outputs by
TABLE_TYPE=="TABLE"
2) Enumerate all tables (user & system) in a database.
We can call conn.GetSchema("Tables"); and filter the outputs by
TABLE_TYPE=="TABLE" OR TABLE_TYPE=="SYSTEM TABLE"
3) Enumerate all user views in a database.
We can call conn.GetSchema("Tables"); and filter the outputs by
TABLE_TYPE=="VIEW"
4) Enumerate all views (user & system) in a database.
We can call conn.GetSchema("Tables"); and filter the outputs by
TABLE_TYPE=="VIEW" OR TABLE_TYPE=="SYSTEM VIEW"
5) Enumerate all columns in a table or view.
We can call conn.GetSchema("Columns"); and filter the outputs by
TABLE_NAME=="our table/view name"
6) For a column, get it's data type.
The DATA_TYPE field of question 5) provides the data type info of the
column.
7) Enumerate all user stored procedures in a database
8) Enumerate all stored procedures (user & system) in a database.
We can call conn.GetSchema("Procedures"); to get all the stored procedures.
As far as I know, there's no strict criteria to distinguish the user/system
stored procedure. A possible solution is to filter by SP name because all
the system SPs starts with "dt_" or "sp_".
9) For a stored procedure, get all parameters and their data type.
conn.GetSchema("ProcedureParameters"); and filter the outputs by
PROCEDURE_NAME="our procedure name"
10) For all objects - get the description of it in the metadata.
Do you mean MetaDataCollections?
http://msdn.microsoft.com/en-us/library/ms254501(VS.80).aspx
Apart from the above, OLEDB provider has an additional set of methods to
retrieve the schema info:
http://support.microsoft.com/kb/309681/en-us
If you have any other questions or concerns, please DON'T hesitate to tell
me.
Regards,
Jialiang Ge (jialge@xxxxxxxxxxxxxxxxxxxx, remove 'online.')
Microsoft Online Community Support
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