What I actually want to do is I want to send a string array to SQL Server. I am using SQL Server 2008.
This can be marked as duplicate but I am facing a whole other problem when implementing a solution from stactoverflow
LINK: How to pass an array into a SQL Server stored procedure
Here is my C# and stored procedure code
C# code:
string[] str = new string[] {"s" , "a" , "k"};
DataTable dt = new DataTable();
dt.Columns.Add("names");
foreach (string item in str)
{
dt.Rows.Add(item);
}
foreach (DataRow r in dt.Rows)
{
Console.WriteLine(r["names"].ToString());
}
DataTable tvp = new DataTable();
SqlConnection conn = new SqlConnection("Data Source=SHZAK;Initial Catalog=synchroniztionTesing;Integrated Security=True");
conn.Open();
using (conn)
{
SqlCommand cmd = new SqlCommand("strpdPassAnStringArray", conn);
cmd.CommandType = CommandType.StoredProcedure;
SqlParameter tvparam = cmd.Parameters.AddWithValue("@List", tvp);
tvparam.SqlDbType = SqlDbType.Structured;
cmd.ExecuteScalar();
}
Before making stored procedure I created a custom type:
CREATE TYPE dbo.arrayOfNames
AS TABLE
(
name nvarchar(max)
);
Stored procedure code:
CREATE PROCEDURE [dbo].[strpdPassAnStringArray]
@List AS dbo.arrayOfNames READONLY
AS
BEGIN
SET NOCOUNT ON;
SELECT name FROM @List;
END
But in application code it is raising this exception:
There are not enough fields in the Structured type. Structured types must have at least one field.
on line
cmd.ExecuteScalar();
ANSWER:
I was so dumb to ask that Question , but at least now i know that what causes this exception
If your DataTable is empty as it was in my case this exception can be raised
string[] str = new string[] {"sheraz" , "ahmed" , "khan"};
DataTable tvp = new DataTable();
tvp.Columns.Add("names");
foreach (string item in str)
{
tvp.Rows.Add(item);
}
foreach (DataRow r in tvp.Rows)
{
Console.WriteLine(r["names"].ToString());
}
SqlConnection conn = new SqlConnection("Data Source=SHZAK;Initial Catalog=synchroniztionTesing;Integrated Security=True");
conn.Open();
using (conn)
{
SqlCommand cmd = new SqlCommand("strpdPassAnStringArray", conn);
cmd.CommandType = CommandType.StoredProcedure;
SqlParameter tvparam = cmd.Parameters.AddWithValue("@List", tvp);
tvparam.SqlDbType = SqlDbType.Structured;
cmd.ExecuteScalar();
}