I am calling a SQL Server stored procedure from my C# code:
using (SqlConnection conn = new SqlConnection(connstring))
{
conn.Open();
using (SqlCommand cmd = new SqlCommand("InsertQuerySPROC", conn))
{
cmd.CommandType = CommandType.StoredProcedure;
var STableParameter = cmd.Parameters.AddWithValue("@QueryTable", QueryTable);
var NDistanceParameter = cmd.Parameters.AddWithValue("@NDistanceThreshold", NDistanceThreshold);
var RDistanceParameter = cmd.Parameters.AddWithValue(@"RDistanceThreshold", RDistanceThreshold);
STableParameter .SqlDbType = SqlDbType.Structured;
NDistanceParameter.SqlDbType = SqlDbType.Int;
RDistanceParameter.SqlDbType = SqlDbType.Int;
// Execute the query
SqlDataReader QueryReader = cmd.ExecuteReader();
My stored proc is fairly standard but does a join with QueryTable
(hence the need for for using a stored proc).
Now: I want to add a list of strings, List<string>
, to the parameter set. For example, my stored proc query goes like this:
SELECT feature
FROM table1 t1
INNER JOIN @QueryTable t2 ON t1.fid = t2.fid
WHERE title IN <LIST_OF_STRINGS_GOES_HERE>
However, the list of strings is dynamic and a few hundred long.
Is there a way to pass a list of strings List<string>
to the stored proc??? Or is there a better way to do this?
Many thanks, Brett
If you're using SQL Server 2008, there's a new featured called a User Defined Table Type. Here is an example of how to use it:
Create your User Defined Table Type:
CREATE TYPE [dbo].[StringList] AS TABLE(
[Item] [NVARCHAR](MAX) NULL
);
Next you need to use it properly in your stored procedure:
CREATE PROCEDURE [dbo].[sp_UseStringList]
@list StringList READONLY
AS
BEGIN
-- Just return the items we passed in
SELECT l.Item FROM @list l;
END
Finally here's some sql to use it in c#:
using (var con = new SqlConnection(connstring))
{
con.Open();
using (SqlCommand cmd = new SqlCommand("exec sp_UseStringList @list", con))
{
using (var table = new DataTable()) {
table.Columns.Add("Item", typeof(string));
for (int i = 0; i < 10; i++)
table.Rows.Add("Item " + i.ToString());
var pList = new SqlParameter("@list", SqlDbType.Structured);
pList.TypeName = "dbo.StringList";
pList.Value = table;
cmd.Parameters.Add(pList);
using (var dr = cmd.ExecuteReader())
{
while (dr.Read())
Console.WriteLine(dr["Item"].ToString());
}
}
}
}
To execute this from SSMS
DECLARE @list AS StringList
INSERT INTO @list VALUES ('Apple')
INSERT INTO @list VALUES ('Banana')
INSERT INTO @list VALUES ('Orange')
-- Alternatively, you can populate @list with an INSERT-SELECT
INSERT INTO @list
SELECT Name FROM Fruits
EXEC sp_UseStringList @list