How to execute this SQL query using ADO.NET? - sql-server-2008

Question

Given this EXACT ad-hoc query:
DECLARE #list AS TABLE (Name VARCHAR(20))
INSERT INTO #list(Name)
VALUES ('Otter', 'Lebron', 'Aaron', 'Brock')
SELECT *
FROM Users
WHERE FirstName in (SELECT Name from #list)
How can this be done using C# ADO.NET with a SqlParameter?

Answer 1

I'm using a modification of your orginal SQL for sample purposes.
DECLARE #list AS TABLE (Name VARCHAR(20));
INSERT INTO #list(Name)
VALUES ('PROCEDURE'),
('FUNCTION');
SELECT *
FROM INFORMATION_SCHEMA.ROUTINES
WHERE ROUTINE_TYPE in (SELECT Name from #list)
You can use a Table-Valued Parameter
Here's a modified example taken from Table-Valued Parameters in SQL Server 2008 (ADO.NET)
using (SqlConnection cnn = new SqlConnection("Your connection string"))
{
var tableParam = new DataTable("names");
tableParam.Columns.Add("Name", typeof(string));
tableParam.Rows.Add(new object[] { "PROCEDURE" });
tableParam.Rows.Add(new object[] { "FUNCTION')" });
var sql = #"DECLARE #list AS TABLE (Name VARCHAR(20))
INSERT INTO #list(Name)
SELECT Name from #Names;
SELECT *
FROM INFORMATION_SCHEMA.ROUTINES
WHERE ROUTINE_TYPE in (SELECT Name from #list)";
var sqlCmd = new SqlCommand(sql, cnn);
var tvpParam = sqlCmd.Parameters.AddWithValue("#Names", tableParam);
tvpParam.SqlDbType = SqlDbType.Structured;
tvpParam.TypeName = "dbo.Names";
cnn.Open();
using(SqlDataReader rdr = sqlCmd.ExecuteReader() )
{
while (rdr.Read())
Console.WriteLine(rdr["SPECIFIC_NAME"]);
}
}
But you need to define the type dbo.Names before it can work
Here's the type creation SQL
CREATE TYPE dbo.Names AS TABLE
( Name VARCHAR(Max));
Another option is to use an XML Parameter
using (SqlConnection cnn = new SqlConnection("Your connection string"))
{
var sql = #"DECLARE #list AS TABLE (Name VARCHAR(20))
INSERT INTO #list(Name)
SELECT t.name.value('.', 'varchar(MAX)')
FROM #Names.nodes('/Names/Name') as T(Name);
SELECT *
FROM INFORMATION_SCHEMA.ROUTINES
WHERE ROUTINE_TYPE in (SELECT Name from #list)";
var sqlCmd = new SqlCommand(sql, cnn);
var s = new MemoryStream(ASCIIEncoding.Default.GetBytes("<Names><Name>PROCEDURE</Name><Name>FUNCTION</Name></Names>"));
var xmlParam = new SqlXml(s);
sqlCmd.Parameters.AddWithValue("#Names", xmlParam);
cnn.Open();
using(SqlDataReader rdr = sqlCmd.ExecuteReader() )
{
while (rdr.Read())
Console.WriteLine(rdr["SPECIFIC_NAME"]);
}
}