Question

您好我正在尝试将超文本插入到数据库表中。首先，我将所有单词分隔成小写字母并列在listbox1上，这样才能正常工作。

这是我的表格;

id(int),word(nvarchar),sid(int),frequency(int),weight(float),f(boolean) by order

protected void Button1_Click(object sender, EventArgs e)
        {
            int id=0;
            ListBox1.Items.Clear();
            string strNew = Request.Form["TextBox1"];
           // File.WriteAllText(@"\Users\'uykusuz\Documents\text.txt", strNew);
            int n = strNew.Split(' ').Length;

            strNew=strNew.ToLower();

            var results = strNew.Split(' ').Where(x => x.Length > 1)
                                          .GroupBy(x => x)
                                          .Select(x => new { Count = x.Count(), Word = x.Key })
                                          .OrderByDescending(x => x.Count);

            foreach (var item in results)
                ListBox1.Items.Add(String.Format("{0} occured {1} times", item.Word, item.Count));

            foreach (var item in results) {//here trying to insert word its id and some other informations but for now they can stay null(yes,null allowed for them)
                id++;
                SqlCommand cmd = new SqlCommand("insert into word values('" + id + "','" + item.Word.Text + "','0'),'0'),'0'),'0')", con);
                cmd.ExecuteNonQuery();
                con.Close();

            }

        }

当我按下按钮时，我总是收到此错误;

ExecuteNonQuery需要一个开放且可用的连接。该连接的当前状态已关闭。

EDIT1：

foreach (var item in results) {
                con.Open();
                id++;
                SqlCommand cmd = new SqlCommand("insert into word values('" + id + "','" + item.Word + "','0','0','0','0')", con); 
                cmd.ExecuteNonQuery();
                con.Close();

            }

我已经改变了这样但现在我收到了这个错误

连接未关闭。连接的当前状态是打开的。

Answer 1

尝试将最后一行代码更改为我的示例。每次迭代结果集时，都会关闭与数据库的连接。

using (conn){
    conn.Open();

    foreach (var item in results) {//here trying to insert word its id and some other informations but for now they can stay null(yes,null allowed for them)
        id++;
        SqlCommand cmd = new SqlCommand("insert into word values('" + id + "','" + item.Word.Text + "','0'),'0'),'0'),'0')", con);
        cmd.ExecuteNonQuery();
    }
}

Answer 2

您必须在

之后关闭连接

  using (con){
        con.Open();

        foreach (var item in results) {//here trying to insert word its id and some other informations but for now they can stay null(yes,null allowed for them)
            id++;
            SqlCommand cmd = new SqlCommand("insert into word values('" + id + "','" + item.Word.Text + "','0'),'0'),'0'),'0')", con);
            cmd.ExecuteNonQuery();
        }
    }
con.close();

将超文本插入数据库

2 个答案: