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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