从两个逗号分隔的参数作为输入更新表-C#/.NET问题

Update a table from two comma separated parameter as input(从两个逗号分隔的参数作为输入更新表)

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问题描述

我在前端有一个 Gridview，其中 Grid 有两列:ID 和 Order，如下所示:

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

现在用户可以像在前端 Gridview 中一样更新订单:

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

ID        Order

 1           2
 2           4
 3           1
 4           3

现在，如果用户单击保存按钮，ID 和订单数据将作为@sID = (1,2,3,4) 和@sOrder = (2,4,1,3) 发送到存储过程

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更新表，而选择它给我的结果如下:

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

你可以使用表值参数以避免将分隔符分隔的值甚至 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:

在数据库中声明一个参数类型，像这样:

Declare a parameter type in the database, like this:

CREATE TYPE UpdateOrderType TABLE (ID int, Order int)

之后就可以定义过程来使用参数了

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

如您所见，与解析 XML 或分隔字符串相比，SQL 是微不足道的.

As you can see, the SQL is trivial compared to parsing XML or delimited strings.

使用 C# 中的参数:

Use the parameter from C#:

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 类似于:

//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;
}

(代码取自 this问题)

如您所见，这种方法(特定于 SQL-Server 2008 及更高版本)可以更轻松、更正式地将结构化数据作为参数传递给过程.更重要的是，您一直在使用类型安全，因此在字符串/xml 操作中往往会出现的大部分解析错误都不是问题.

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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