从两个逗号分隔的参数更新一个表作为输入 [英] Update a table from two comma separated parameter as input

问题描述

我有一个Gridview在前端，其中Grid有两列：ID和Order这样：

I have a Gridview in front end where Grid have two columns : ID and Order like this:

 ID        Order

 1           1
 2           2
 3           3
 4           4

现在用户可以像前端Gridview一样更新订单：

Now user can update the order like in front end Gridview:

ID        Order

 1           2
 2           4
 3           1
 4           3

现在，如果用户点击保存按钮，ID和订单数据被发送到存储过程作为@sID =（1,2,3,4）和@sOrder =（2,4,1,3）

Now if the user click the save button the ID and order data is being sent to Stored Procedure as @sID = (1,2,3,4) and @sOrder = (2,4,1,3)

现在如果我想更新订单并进行保存，我想将其存储到数据库中。通过存储过程如何更新到表中，以便表更新，而选择它给我的结果像：

Now if I want to update the order and make save I want to store it into database. Through Stored procedure how can update into the table so that the table is updated and while select it gives me the results like:

ID        Order

 1           2
 2           4
 3           1
 4           3

推荐答案

您可以使用表值参数，以避免将定界符分隔值或甚至XML发送到数据库。为此，您需要：

You could use a table valued parameter to avoid sending delimiter-separated values or even XML to the database. To do this you need to:

1. 在数据库中声明参数类型，如下所示：

1. Declare a parameter type in the database, like this:

CREATE TYPE UpdateOrderType TABLE (ID int, Order int)

之后，您可以定义将参数用作

After that you can define the procedure to use the parameter as

CREATE PROCEDURE UpdateOrder (@UpdateOrderValues UpdateOrderType readonly)
AS
BEGIN
  UPDATE t
    SET OrderID = tvp.Order
    FROM <YourTable> t
      INNER JOIN @UpdateOrderValues tvp ON t.ID=tvp.ID
END

使用C＃中的参数：

using (SqlCommand command = connection.CreateCommand()) {
  command.CommandText = "dbo.UpdateOrder";
  command.CommandType = CommandType.StoredProcedure;

  //create a table from your gridview data
  DataTable paramValue = CreateDataTable(orderedData) 
  SqlParameter parameter = command.Parameters
                            .AddWithValue("@UpdateOrderValues", paramValue );
  parameter.SqlDbType = SqlDbType.Structured;
  parameter.TypeName = "dbo.UpdateOrderType";

  command.ExecuteNonQuery();
}

其中 CreateDataTable 例如：

//assuming the source data has ID and Order properties
private static DataTable CreateDataTable(IEnumerable<OrderData> source) {
  DataTable table = new DataTable();
  table.Columns.Add("ID", typeof(int));
  table.Columns.Add("Order", typeof(int));
  foreach (OrderData data in source) {
      table.Rows.Add(data.ID, data.Order);
  }
  return table;
}

（代码从此问题）

正如你所看到的，这种方法（特定于SQL Server 2008和更高版本）使结构化数据作为参数传递到过程变得更容易和更正式。更重要的是，你一直在使用类型安全，所以很多在字符串/ xml操作中出现的解析错误不是问题。

As you can see this approach (specific to SQL-Server 2008 and up) makes it easier and more formal to pass in structured data as a parameter to a procedure. What's more, you're working with type safety all the way, so much of the parsing errors that tend to crop up in string/xml manipulation are not an issue.

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