Question

我已经将SQL数据库连接到aspx.net表单，但是当我在表单中输入详细信息时，它似乎并没有在SQL表中更新。我检查了代码，似乎没有任何错误。谁能看到我的代码出了什么问题？

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data.Sql;


public partial class CustomerLogin : System.Web.UI.Page {
    public string sqlTest = "Data Source=TEAFAMILY;Initial Catalog=Bolsen;Integrated Security=True";

    protected void Page_Load(object sender, EventArgs e) {

    }

    static readonly string scriptSuccessNewAccount =
    "<script language=\"javascript\">\n" +
        "alert (\"Your account has been succesfully created - Thank You!\");\n" +
    "</script>";


    protected void Button1_Click1(object sender, EventArgs e) {
        SqlConnection mDB = new SqlConnection(sqlTest);
        mDB.Open();
        Type csType = this.GetType();
        SqlCommand cmd;
        SqlDataReader rdr;
        string strSQLSelect = "SELECT cEmail FROM Customers ORDER BY cEmail";

        cmd = new SqlCommand(strSQLSelect, mDB);
        Console.Write(cmd);
        rdr = cmd.ExecuteReader();

        //insert new record
        string strSQLInsert = "INSERT INTO"
            + " Customers (cFirstname, cLastname, cNumber, cCompanyname, cAdd, cEmail, cPassword)"
            + " VALUES (@FN, @LN, @Num, @Cname, @Add, @Email, @Pw)";

        cmd = new SqlCommand(strSQLInsert, mDB);
        cmd.Parameters.AddWithValue("@FN", txtFN.Text);
        cmd.Parameters.AddWithValue("@LN", txtLN.Text);
        cmd.Parameters.AddWithValue("@Num", txtPN.Text);
        cmd.Parameters.AddWithValue("@Cname", txtComp.Text);
        cmd.Parameters.AddWithValue("@Add", txtCompAdd.Text);
        cmd.Parameters.AddWithValue("@Email", txtEmail.Text);
        cmd.Parameters.AddWithValue("@Pw", txtPW.Text);

        cmd.ExecuteNonQuery();
        mDB.Close();
        ClientScript.RegisterStartupScript(csType, "Success", scriptSuccessNewAccount);
    }
}

Answer 1

您没有关闭SqlDataReader。除了不调用rdr.Read()并获取任何值之外，您还需要在执行第二条sql语句之前调用rdr.Close()。

每个MSDN-正在使用SqlDataReader时，关联的SqlConnection忙于为SqlDataReader提供服务，除了关闭它以外，无法对SqlConnection执行其他任何操作。在调用SqlDataReader的Close方法之前，情况就是这样。例如，您必须在调用Close之后才能检索输出参数。

连接的数据库未更新

1 个答案: