Question

我找到了这个代码（Credits to：http://www.c-sharpcorner.com/UploadFile/8c19e8/dynamically-adding-and-deleting-rows-in-gridview-and-saving/），其中动态创建了Gridview。

我想添加＆＃34; P_deaseases＆＃34;数据表，会话[＆＃34; pa_id＆＃34;]以及gridview数据（使用参数）。代码只能很好地插入gridview数据，而没有添加额外的列＆＃34; P_Id＆＃34;。我已经在我改变代码的地方发表了一些评论。

尽管有这些变化，但仍然存在错误。

你能否建议我应该改变什么？

代码：

 private string GetConnectionString()
    {
        return ConfigurationManager.ConnectionStrings["RegistrationConnectionString"].ConnectionString;
    }


    private void InsertRecords(StringCollection sc)
    {
        StringBuilder sb = new StringBuilder(string.Empty);
        string[] splitItems = null;
        const string sqlStatement = "INSERT INTO P_deasease (P_Id,Nosos,Situ,Year_d,Therapy) VALUES (@p_id)"; //I added the P_Id and the parameter
        int id = Convert.ToInt32(Session["pa_id"]); //I added that
        foreach (string item in sc)
        {
            if (item.Contains(","))
            {
                splitItems = item.Split(",".ToCharArray());
                sb.AppendFormat("{0}('{1}','{2}','{3}','{4}'); ", sqlStatement, splitItems[0], splitItems[1], splitItems[2], splitItems[3]);
            }
        }

        using (SqlConnection connection = new SqlConnection(GetConnectionString()))
        {
            connection.Open();


            using (SqlCommand cmd = new SqlCommand(sb.ToString(), connection))
            {
                cmd.Parameters.AddWithValue("@p_id", id); //I added that
                cmd.CommandType = CommandType.Text;
                cmd.ExecuteNonQuery();

            }
        }


        lblMessage.ForeColor = System.Drawing.Color.Green;
        lblMessage.Text = "Οι εγγραφές αποθηκεύτηκαν!";
    }


  protected void BtnSave_Click(object sender, EventArgs e)
    {
        int rowIndex = 0;
        StringCollection sc = new StringCollection();
        if (ViewState["CurrentTable"] != null)
        {
            DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
            if (dtCurrentTable.Rows.Count > 0)
            {
                for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
                {
                    //extract the values  
                    TextBox box1 = (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("TextBox1");
                    TextBox box2 = (TextBox)Gridview1.Rows[rowIndex].Cells[2].FindControl("TextBox2");
                    DropDownList ddl1 = (DropDownList)Gridview1.Rows[rowIndex].Cells[3].FindControl("DropDownList1");
                    TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[4].FindControl("TextBox3");

                    //add them to the collections with a comma "," as the delimited values  
                    sc.Add(string.Format("{0},{1},{2},{3}", box1.Text, box2.Text, ddl1.SelectedItem.Text, box3.Text));
                    rowIndex++;
                }
                //Call the method for executing inserts  
                InsertRecords(sc);
            }
        }
    }

Answer 1

您以错误的方式添加了参数。请注意，foreach添加了这样的字符串：

<already built sql expression> (s1,s2,s3,s4)

示例：

INSERT INTO P_deasease (Nosos,Situ,Year_d,Therapy) VALUES (s1,s2,s3,s4)

哪个是有效的插入子句。现在添加您的内容如下：

INSERT INTO P_deasease (P_Id,Nosos,Situ,Year_d,Therapy) VALUES (@p_id)(s1,s2,s3,s4)

根本无效。

现在您可能希望P_Id为所有新条目填充相同的值。这应该是这样的：

    const string sqlStatement = "INSERT INTO P_deasease (P_Id,Nosos,Situ,Year_d,Therapy) VALUES "; //I added the P_Id and the parameter
    int id = Convert.ToInt32(Session["pa_id"]); //I added that
    foreach (string item in sc)
    {
        if (item.Contains(","))
        {
            splitItems = item.Split(",".ToCharArray());
            sb.AppendFormat("{0}(@p_id, '{1}','{2}','{3}','{4}'); ", sqlStatement, splitItems[0], splitItems[1], splitItems[2], splitItems[3]);
        }
    }

但说实话，这是一件奇怪的事情。如果P_Id是主键列，则会失败，因为您不能有两个具有相同主键的行。您是否真的考虑过为数据库中的列设置自动生成ID？

C＃ - 插入会话值以及动态Gridview的数据

1 个答案: