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List SQL Server table column name as rows

, 3 May 2012
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This is an alternative for "List SQL Server table column name as rows"

A more database-agnostic way to get information about the columns of a table in .NET is to use the GetSchemaTable method of an IDataReader. Simply perform ExecuteReader on an SQL statement like

SELECT * FROM source WHERE 0=1

(being sure to protect against SQL injection of course) and iterate the Rows in the resultant DataTable. The 0=1 ensures that we don't waste bandwidth transferring data needlessly. You can (and should) Close the IDataReader as soon as you have the DataTable.

I have found that each ADO.NET provider uses a slightly different order of the columns and some have more columns than others, but the only ones I'm interested in are: ColumnName, DataType, ProviderType, ColumnSize, and AllowDBNull. ProviderType needs to be parsed into an appropriate enumeration (e.g. System.Data.SqlDbType when using SQL Server) to get a meaningful value.

An additional benefit of this technique is that you can list out the columns of a view or ad hoc SQL as well, not just tables.

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PIEBALDconsult
Software Developer (Senior)
United States United States
BSCS 1992 Wentworth Institute of Technology
 
Originally from the Boston (MA) area. Lived in SoCal for a while. Now in the Phoenix (AZ) area.
 
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