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(60),
user_pass varchar(64),
user_nicename varchar(50),
user_email varchar(100),
user_url varchar(100),
user_activation_key varchar(60),
user_status int,
display_name varchar(250)
)
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();