C# 4 and .NET 4

968 ❘ ChaPTer 34 .net prOGrAmminG with sQl server
SqlCommand command = new SqlCommand();
command.Connection = connection;
command.CommandText = "SELECT SalesOrderID, OrderDate, DueDate, " +
"ShipDate " +
"FROM Sales.SalesOrderHeader " +
"WHERE (CustomerID = @CustomerID)" +
"ORDER BY SalesOrderID";
command.Parameters.Add("@CustomerID", SqlDbType.Int);
command.Parameters["@CustomerID"].Value = customerId;
};
}
SqlDataReader reader = command.ExecuteReader();
SqlPipe pipe = SqlContext.Pipe;
pipe.Send(reader);
connection.Close();
code snippet SqlSamplesUsingAdventureWorks/GetCustomerOrdersCLR.cs
CLR stored procedures are deployed to SQL Server either using Visual Studio or with the CREATE
PROCEDURE statement. With this SQL statement, the parameters of the stored procedure are defined, as well
as the name of the assembly, class, and method:
CREATE PROCEDURE GetCustomerOrdersCLR
(
@CustomerID nchar(5)
)
AS EXTERNAL NAME Demo.StoredProcedures.GetCustomerOrdersCLR
using stored Procedures
The CLR stored procedure can be invoked just like a T-SQL stored procedure by using classes from the
namespace System.Data.SqlClient. First, a SqlConnection object is created. The CreateCommand()
method returns a SqlCommand object. With the command object, the name of the stored procedure
GetCustomerOrdersCLR is set to the CommandText property. As with all stored procedures, the
CommandType property must be set to CommandType.StoredProcedure. The method ExecuteReader()
returns a SqlDataReader object to read record by record:
using System;
using System.Data;
using System.Data.SqlClient;
//...
string connectionString =
@"server=(local);database=AdventureWorks;trusted_connection=true";
var connection = new SqlConnection(connectionString);
SqlCommand command = connection.CreateCommand();
command.CommandText = "GetCustomerOrdersCLR";
command.CommandType = CommandType.StoredProcedure;
var param = new SqlParameter("@customerId", 3);
command.Parameters.Add(param);
connection.Open();
SqlDataReader reader =
command.ExecuteReader(CommandBehavior.CloseConnection);
while (reader.Read())
{
Console.WriteLine("{0} {1:d}", reader["SalesOrderID"], reader["OrderDate"]);
}
reader.Close();
code snippet UsingSP/Program.cs
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