如何为列创建一个多值? [英] How can I create a multi value for a column?
本文介绍了如何为列创建一个多值?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有两个表TBLCustomers
和TBLGroupCustomers
.我想在第三个表中插入多值
I have two tables TBLCustomers
and TBLGroupCustomers
. I want to insert multi value in a third table that
CREATE TABLE [dbo].[TBLG_Groups]
(
[GrId] INT IDENTITY (1, 1) NOT NULL,
[CEmail] VARCHAR (250) NOT NULL,
[GName] NVARCHAR (70) NOT NULL,
[CName] NVARCHAR (450) NULL,
PRIMARY KEY CLUSTERED ([GrId] ASC, [CEmail] ASC, [GName] ASC)
)
CEmail
,TBLCustomers
中的CName
和TBLGroupCustomers
为此,我创建了一个存储过程:
To do this, I created a stored procedure:
CREATE PROC dbo.spG_Groups
@CEmail VARCHAR(250),
@GName NVARCHAR (70),
@CName NVARCHAR(450)
AS
BEGIN
INSERT INTO TBLG_Groups(CEmail, GName, CName)
VALUES (@CEmail, @GName, @CName)
END
因为我想显示客户加入组的名称,所以我希望表的每个记录都有一个cname和gname,
Because I want show the name of customers join group I want each record of table have a single cname and gname,
C#代码
SqlCommand cmd1 = new SqlCommand("spG_Groups", conn);
cmd1.CommandType = CommandType.StoredProcedure;
List<String> YrStrList1 = new List<string>();
foreach (ListItem li in chGp.Items)
{
if (li.Selected)
{
YrStrList1.Add(li.Value);
cmd1.Parameters.Add(new SqlParameter("@CName", txtCName.Value));
cmd1.Parameters.Add(new SqlParameter("@CEmail", txtemail.Value));
cmd1.Parameters.Add(new SqlParameter("@GName", YrStrList1.ToString()));
cmd1.ExecuteNonQuery();
}
}
这不行我该怎么办?
推荐答案
在foreach
循环之前,您需要一次定义参数一次,然后进行设置它们在每次迭代中的值-像这样:
You need to define the parameters once, before the foreach
loop, and then just set their values on each iteration - something like this:
using (SqlCommand cmd1 = new SqlCommand("spG_Groups", conn))
{
cmd1.CommandType = CommandType.StoredProcedure;
// define the parameters *ONCE*
cmd1.Parameters.Add("@CName", SqlDbType.NVarChar, 450);
cmd1.Parameters.Add("@CEmail", SqlDbType.VarChar, 250);
cmd1.Parameters.Add("@GName", SqlDbType.NVarChar, 70);
List<String> YrStrList1 = new List<string>();
foreach (ListItem li in chGp.Items)
{
if (li.Selected)
{
YrStrList1.Add(li.Value);
// just set the *VALUES* of the parameters
cmd1.Parameters["@CName"].Value = txtCName.Value;
cmd1.Parameters["@CEmail"].Value = txtemail.Value;
cmd1.Parameters["@GName"].Value = YrStrList1.ToString();
cmd1.ExecuteNonQuery();
}
}
}
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