如何拆分逗号分隔值

Question

我在 gridview 中有文本框，我正在执行并插入语句循环遍历我的 gridview 中的每一行。我现在的问题是我可以在文本框中有多个名称，如下所示：

John Carter, Mike David, John Edward,

那么，如何将每个人的姓名拆分并插入到具有相同 ID 的表中？例如，如果当前行的 ID =12，那么我的表将如下所示：

ID      Full_Name
12     John Carter
12     Mike David
12     John Edward

这是我的代码：

 foreach (GridViewRow row in GridView1.Rows)
        {
            if (row.RowType == DataControlRowType.DataRow)
            {
                Label ID = row.FindControl("lbl_ID") as Label;                
                TextBox myUID = row.FindControl("txt_UID") as TextBox;
                string Full_Name = Request.Form[row.FindControl("txt_UID").UniqueID];

                SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["myConn"].ConnectionString);
                SqlCommand cmd = new SqlCommand();

                cmd.CommandType = CommandType.Text;
                cmd.CommandText = @"if not exists(select ID from myTable where ID = @ID)
                                   insert into myTable(ID, Full_Name) values(@ID, @Full_Name)
                                    else update myTable set Full_Name =@Full_Name where ID =@ID";

                cmd.Parameters.Add("@ID", SqlDbType.VarChar).Value = ID.Text;
                cmd.Parameters.Add("@Full_Name", SqlDbType.VarChar).Value = Full_Name.ToString();

                cmd.Connection = con;
                con.Open();
                cmd.ExecuteNonQuery();
                con.Close();

            }
}

Answer 1

string str = "John Carter, Mike David, John Edward,";
string[] names = str.Split(',');
foreach (string name in names)
{
    if (name.Equals(""))
        continue;

    ///dbstuff
    ///insert into myTable(ID, Full_Name) values(@ID, @name)
    ///etc, etc
}

这个强烈假设 ID 不是主键。只要 ID 不是唯一的并且不是键，这种方法就可以工作。

Answer 2

你可以像这样使用循环来执行查询

foreach (string name in Full_Name.Split(','))
{
  cmd.CommandText = @"if not exists(select ID from myTable where ID = @ID)
                        insert into myTable(ID, Full_Name) values(@ID, @Full_Name)
                      else update myTable set Full_Name =@Full_Name where ID =@ID";

  cmd.Parameters.Add("@ID", SqlDbType.VarChar).Value = ID.Text;
  cmd.Parameters.Add("@Full_Name", SqlDbType.VarChar).Value = name

  cmd.Connection = con;
  con.Open();
  cmd.ExecuteNonQuery();
  con.Close();
}

Answer 3

这是我在上面评论中的建议的一个非常粗略/快速的概念。还没来得及测试。

 foreach (GridViewRow row in GridView1.Rows)
        {
            if (row.RowType == DataControlRowType.DataRow)
            {
                Label ID = row.FindControl("lbl_ID") as Label;                
                TextBox myUID = row.FindControl("txt_UID") as TextBox;
                string Full_Name = Request.Form[row.FindControl("txt_UID").UniqueID];

                SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["myConn"].ConnectionString);
                SqlCommand cmd = new SqlCommand();

                cmd.CommandType = CommandType.Text;
                cmd.CommandText = @"if not exists(select ID from myTable where ID = @ID)
                                   insert into myTable(ID, Full_Name) values(@ID, @Full_Name)
                                    else update myTable set Full_Name =@Full_Name where ID =@ID";
                cmd.Connection = con;
                con.Open();
                foreach(string currentName in Full_Name.Split(','))
                {
                    if (currentName!="")
                    {
                        cmd.Parameters.Add("@ID", SqlDbType.VarChar).Value = ID.Text;
                        cmd.Parameters.Add("@Full_Name", SqlDbType.VarChar).Value = currentName;

                        cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                    }
                }
                con.Close();

            }
}