How to Pass a List of Strings to a SQL Server Stored Procedure in C#?
Jan 13, 2025 am 10:21 AM
Passing a List of Strings to a SQL Server Stored Procedure from C#
This guide demonstrates how to pass a list of strings as a parameter to a SQL Server stored procedure from your C# application. This method utilizes a User-Defined Table Type (UDTT), suitable for SQL Server 2008 and later versions.
Defining the User-Defined Table Type (UDTT)
First, create a UDTT in SQL Server to represent your string list:
CREATE TYPE [dbo].[StringList] AS TABLE(
[Item] [NVARCHAR](MAX) NULL
);
Modifying the Stored Procedure
Next, modify your stored procedure to accept the UDTT as input:
CREATE PROCEDURE [dbo].[sp_UseStringList]
@list StringList READONLY
AS
BEGIN
-- Process the string list
SELECT l.Item FROM @list l;
END
C# Implementation
Here's how to use the UDTT within your C# code:
using (SqlConnection con = new SqlConnection(connstring))
{
con.Open();
using (SqlCommand cmd = new SqlCommand("sp_UseStringList", con))
{
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@list", CreateStringListTable(new List<string> { "Apple", "Banana", "Orange" }));
using (SqlDataReader reader = cmd.ExecuteReader())
{
while (reader.Read())
{
// Process each string from the reader
string item = reader["Item"].ToString();
Console.WriteLine(item);
}
}
}
}
//Helper function to create the DataTable
private DataTable CreateStringListTable(List<string> stringList)
{
DataTable dt = new DataTable();
dt.Columns.Add("Item", typeof(string));
foreach (string str in stringList)
{
dt.Rows.Add(str);
}
return dt;
}
Executing the Stored Procedure (SQL Example)
For testing purposes, you can execute the stored procedure directly in SQL Server Management Studio (SSMS) like this:
DECLARE @list AS StringList;
INSERT INTO @list VALUES ('Apple');
INSERT INTO @list VALUES ('Banana');
INSERT INTO @list VALUES ('Orange');
EXEC sp_UseStringList @list;
This approach offers a robust and efficient way to handle lists of strings when interacting with SQL Server stored procedures from your C# applications. The use of a UDTT ensures data integrity and improves performance compared to other methods.
The above is the detailed content of How to Pass a List of Strings to a SQL Server Stored Procedure in C#?. For more information, please follow other related articles on the PHP Chinese website!
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