C# ado.net 操作存储过程(二)

调用存储过程

sql

 IF OBJECT_ID('RegionInsert') IS NULL
 EXEC ('
 --
 -- Procedure which inserts a region record and returns the key
 --
 CREATE PROCEDURE RegionInsert(@RegionDescription NCHAR(50),
                               @RegionID INTEGER OUTPUT)AS
   SET NOCOUNT OFF;

   SELECT @RegionID = MAX ( RegionID ) + 1
                        FROM Region ;

   INSERT INTO Region(RegionID, RegionDescription)
     VALUES(@RegionID, @RegionDescription);')

 IF OBJECT_ID('RegionUpdate') IS NULL
 EXEC ('
 --
 -- Procedure to update the description of a region
 --
 CREATE PROCEDURE RegionUpdate(@RegionID INTEGER,
                               @RegionDescription NCHAR(50))AS
   SET NOCOUNT OFF;

   UPDATE Region
     SET RegionDescription = @RegionDescription
     WHERE RegionID = @RegionID;')

 IF OBJECT_ID('RegionDelete') IS NULL
 EXEC ('
 --
 -- Procedure to delete a region
 --
 CREATE PROCEDURE RegionDelete (@RegionID INTEGER) AS
   SET NOCOUNT OFF;

   DELETE FROM Region
     WHERE RegionID = @RegionID;');

代码

 class Program
     {
         private static string constr = "server=.;database=northwnd;integrated security=sspi";
         static void Main(string[] args)
         {
             using (SqlConnection con=new SqlConnection(constr))
             {
                 con.Open();
                 InitialiseDatabase(con);
                 // Generate the update command
                 SqlCommand updateCommand = GenerateUpdateCommand(con);

                 // Generate the delete command
                 SqlCommand deleteCommand = GenerateDeleteCommand(con);

                 // And the insert command
                 SqlCommand insertCommand = GenerateInsertCommand(con);

                 DumpRegions(con, "Regions prior to any stored procedure calls");

                 insertCommand.Parameters["@RegionDescription"].Value = "South West";

                 // Then execute the command
                 insertCommand.ExecuteNonQuery();

                 // And then get the value returned from the stored proc
                 int newRegionID = (int)insertCommand.Parameters["@RegionID"].Value;

                 DumpRegions(con, "Regions after inserting 'South West'");

                 updateCommand.Parameters[].Value = newRegionID;
                 updateCommand.Parameters[].Value = "South Western England";
                 updateCommand.ExecuteNonQuery();

                 DumpRegions(con, "Regions after updating 'South West' to 'South Western England'");

                 // Delete the newly created record
                 deleteCommand.Parameters["@RegionID"].Value = newRegionID;
                 deleteCommand.ExecuteNonQuery();

                 DumpRegions(con, "Regions after deleting 'South Western England'");

                 con.Close();
             }
         }

         private static void InitialiseDatabase(SqlConnection conn)
         {
             SqlCommand cmd = new SqlCommand(Resource1.CreateSprocs, conn);
             cmd.ExecuteNonQuery();
         }

         private static SqlCommand GenerateUpdateCommand(SqlConnection con)
         {
             SqlCommand cmd = new SqlCommand("RegionUpdate", con);

             cmd.CommandType = System.Data.CommandType.StoredProcedure;
             cmd.Parameters.Add(new SqlParameter("@RegionID", SqlDbType.Int, 0, "RegionID"));
             cmd.Parameters.Add(new SqlParameter("@RegionDescription", SqlDbType.NChar, 50, "RegionDescription"));
             cmd.UpdatedRowSource = UpdateRowSource.None;
             return cmd;
         }
         private static SqlCommand GenerateInsertCommand(SqlConnection conn)
         {
             SqlCommand aCommand = new SqlCommand("RegionInsert", conn);

             aCommand.CommandType = CommandType.StoredProcedure;
             aCommand.Parameters.Add(new SqlParameter("@RegionDescription", SqlDbType.NChar, 50, "RegionDescription"));
             aCommand.Parameters.Add(new SqlParameter("@RegionID", SqlDbType.Int, 0, ParameterDirection.Output,
                 false, 0, 0, "RegionID", DataRowVersion.Default, null));
             aCommand.UpdatedRowSource = UpdateRowSource.OutputParameters;

             return aCommand;
         }
         private static SqlCommand GenerateDeleteCommand(SqlConnection conn)
         {
             SqlCommand aCommand = new SqlCommand("RegionDelete", conn);

             aCommand.CommandType = CommandType.StoredProcedure;
             aCommand.Parameters.Add(new SqlParameter("@RegionID", SqlDbType.Int, 0, "RegionID"));
             aCommand.UpdatedRowSource = UpdateRowSource.None;

             return aCommand;
         }
         private static void DumpRegions(SqlConnection conn, string message)
         {
             SqlCommand aCommand = new SqlCommand("SELECT RegionID , RegionDescription From Region", conn);

             // Note the use of CommandBehaviour.KeyInfo.
             // If this is not set, the default seems to be CommandBehavior.CloseConnection,
             // which is an odd default if there ever was one.  Oh well.
             SqlDataReader aReader = aCommand.ExecuteReader(CommandBehavior.KeyInfo);

             Console.WriteLine(message);

             while (aReader.Read())
             {
                 Console.WriteLine("  {0,-20} {1,-40}", aReader[], aReader[]);
             }

             aReader.Close();
         }

     }