[英]How can I create a multi value for a column?
我有兩個表TBLCustomers
和TBLGroupCustomers
。 我想在第三個表中插入多值
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
, CName
從TBLCustomers
和GName
從TBLGroupCustomers
為此,我創建了一個存儲過程:
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
因為我想顯示客戶加入組的名稱,所以我希望表的每個記錄都有一個cname和gname,
C#代碼
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();
}
}
這不起作用我該怎么辦?
您需要在foreach
循環之前定義 一次參數,然后只需在每次迭代中設置它們的值-就像這樣:
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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