从SELECT语句存储多个值，然后插入到不同的表中 [英] Store multiple values from SELECT statement and then insert into different table

问题描述

我想基于列表框中的多个值使用 SELECT 语句到表中并获取多个ID，然后运行 INSERT 语句并将多个ID存储到一个 INSERT 语句中的另一个表.

I want to use a SELECT statement into a table based on multiple values from ListBox and get multiple IDs and then run an INSERT statement and store the multiple IDs into a different table from INSERT statement.

下面的代码无法正常工作，因为我在单行而不是在多个行中获得多个ID.

My code below is not working as I am getting "NULL" in single row instead of multiple IDs in multiple rows.

我正在对所有SQL语句使用存储过程.

I am using a stored procedure for all the SQL statements.

请在下面查看我的代码:

Please see my code below:

我的ASPX网页的代码背后:

Code-behind of my ASPX web page:

string listboxvalue = "";

foreach (ListItem item in listbox.Items)
{
    if (item.Selected)
    {
        listboxvalue += item.Text + ',';
    }
}

listboxvalue = listboxvalue.Substring(0, listboxvalue.Length - 1);
cmd.Parameters.AddWithValue("spselectvalue", listboxvalue);

存储过程:

@spselectvalue nvarchar(MAX),

// Select multiple Ids based on multiple items from list box

DECLARE @Dis TABLE (DisID int)

INSERT INTO @Dis 
    SELECT DId 
    FROM [table name] 
    WHERE [COLUMN] IN ('+@spselectvalue +')

EXEC sp_executesql @Dis

// Insert multiple Ids (from above select statement) into different table
INSERT INTO [dbo].[DifferentTable] ([SelectedIds])
VALUES
(
    (SELECT DisID from @Dis)
)

推荐答案

似乎您的问题是您不知道如何将ID列表放入存储过程中进行处理.希望这个例子会有所帮助.如果采用这种方式，您将不必弄乱逗号分隔的字符串或动态SQL.

Seems like your problem is that you don't know how to get a list of ID's into a stored procedure for processing. Hopefully this example will help. If you do it this way, you won't have to mess with comma-delimited strings or dynamic SQL.

首先，定义一个可以包含ID列表的SQL类型:

First, define a SQL type that can contain your list of IDs:

CREATE TYPE dbo.MyList
AS TABLE
(
    ID VarChar(50)
);

然后，编写一个接受此类型作为其输入参数的存储过程:

Then, write a stored procedure that accepts this type as its input parameter:

CREATE PROCEDURE dbo.InsertAList
    @List AS dbo.MyList READONLY
AS
BEGIN
    SET NOCOUNT ON;

    INSERT INTO [dbo].[DifferentTable] 
    SELECT ID FROM @List
END

现在将您的数据从c#端绑定到存储过程.要绑定它，您必须首先将数据存储在 DataTable 中，这相对容易:

Now to bind your data to the stored procedure from the c# end. To bind it, you have to store the data in a DataTable first, which is relatively easy:

var table = new DataTable();
table.Columns.Add("ID", typeof(string));
foreach (ListItem item in listBox.Items.Where(i => i.Selected))
{
    table.Rows.Add(item.Text);
}

然后将表提交给存储过程，如下所示:

Then submit the table to the stored procedure like so:

var cmd = new SqlCommand()
    {
        CommandType = CommandType.StoredProcedure,
        CommandText = "InsertAList",
        Connection = myConnection
    };
cmd.Parameters.Add(new SqlParameter("@List", SqlDbType.Structured)
    {
        TypeName = "dbo.MyList",
        Value = table
    });
cmd.ExecuteNonQuery();

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