Question

假设我有这种方法

public static void LockPerformanceToDB(List<performance> listOfPerformances)
{
    //Do I need just to wrap this call with a loop? ... 
    using(var con = new OpenConnection)
    {
       //I call the LockPerformanceToDB SPROC here ...
    }
}

我在数据库中也有这个程序：

CREATE PROCEDURE LockPerformancesToDB
    @UserId INT,
    @Comments VARCHAR(50),
    @TimeStamp DATETIME
AS
BEGIN
    INSERT INTO Performance
    (UserId, Comments, [TimeStamp])
    VALUES
    (@UserId, @Comments, @TimeStamp)
END

这个sproc一次处理一次插入。很明显，列表中有几个相同的性能对象。循环遍历列表中的每个对象解决方案吗？

我想知道除了循环和调用sproc之外还有不同的解决方案，因为lisOfPerformances中有对象吗？

感谢您的帮助

Answer 1

为什么不使用Table-Valued Parameters将多行传递给存储过程。

使用用户定义的表类型声明表值参数。您可以使用表值参数将多行数据发送到Transact-SQL语句或例程（例如存储过程或函数），而无需创建临时表或许多参数。

创建类型

Create Type TVP_LockPerformancesToDB As Table(
 UserId int, Comments varchar(50), [TimeStamp] datetime)

将存储过程创建为

CREATE PROCEDURE LockPerformancesToDB2
@CommentInfo TVP_LockPerformancesToDB READONLY
AS
BEGIN
  INSERT INTO Performance
   (UserId, Comments, [TimeStamp])
    SELECT UserId, Comments, [TimeStamp]
  FROM @CommentInfo
END

然后在你的代码中

class Performance
{
    public int UserId { get; set; }
    public string Comments { get; set; }
    public DateTime TimeStamp { get; set; }
}



List<Performance> listOfPerformances = new List<Performance>() {
     new Performance{ UserId=1, Comments="First", TimeStamp=DateTime.Now},
     new Performance{ UserId=2, Comments="Second", TimeStamp=DateTime.Now},
     new Performance{ UserId=3, Comments="Third", TimeStamp=DateTime.Now}
 };


 SqlCommand cmd = new SqlCommand();
 var dt = new DataTable();
 dt.Columns.Add("UserId", typeof(Int32));
 dt.Columns.Add("Comments", typeof(string));
 dt.Columns.Add("TimeStamp", typeof(DateTime));
 for (int i = 0; i < listOfPerformances.Count; i++)
 {
    dt.Rows.Add(listOfPerformances[i].UserId, listOfPerformances[i].Comments, listOfPerformances[i].TimeStamp);
 }

 cmd.Connection = conn;
 cmd.CommandText = "LockPerformancesToDB2";
 cmd.CommandType = CommandType.StoredProcedure;
 cmd.Parameters.Add(new SqlParameter("CommentInfo", SqlDbType.Structured));
 cmd.Parameters["CommentInfo"].Value = dt;

 cmd.ExecuteNonQuery();

如何在ado.net中使用存储过程插入对象列表

1 个答案: