msSQL使用表参数

 使用表参数
  表变量（Table Parameters）可以将整个表数据汇集成一个参数传递给存储过程或SQL语句。它的注意性能开销是将数据汇集成参数(O(数据量))。
 定义了一个表参数jk_users_bulk_insert

 CREATE TYPE jk_users_bulk_insert AS TABLE (
 user_login varchar(),
 user_pass varchar(),
 user_nicename varchar(),
 user_email varchar(),
 user_url varchar(),
 user_activation_key varchar(),
 user_status int,
 display_name varchar()
 )
  定义一个存储过程接受表参数jk_users_bulk_insert  

 CREATE PROCEDURE sp_insert_jk_users
 @usersTable jk_users_bulk_insert READONLY
 AS 

 INSERT INTO jk_users (user_login, user_pass, user_nicename, user_email, user_url,
 user_activation_key, user_status, display_name, user_registered) 

 SELECT user_login, user_pass, user_nicename, user_email, user_url,
 user_activation_key, user_status, display_name, GETDATE()
 FROM @usersTable

  客户端代码中，调用存储过程并且将表作为参数方式传递给存储过程。 

 var sw = Stopwatch.StartNew();
 using (var conn = new SqlConnection(ConfigurationManager.ConnectionStrings["SQLCONN2"].ToString()))
 {
 conn.Open();
 //// Invokes the stored procedure.
 using (var cmd = new SqlCommand("sp_insert_jk_users", conn))
 {
 cmd.CommandType = CommandType.StoredProcedure; 

 //// Adding a "structured" parameter allows you to insert tons of data with low overhead
 var param = new SqlParameter("@userTable", SqlDbType.Structured) { Value = dt };
 cmd.Parameters.Add(param);
 cmd.ExecuteNonQuery();
 }
 }
 sw.Stop();