Question

我有一个简单的asp.net网站和一个简单的数据库。

数据库有一个具有此结构的表Users

现在我一直在尝试执行这个SQL命令

UPDATE [Users] 
SET [UserName] = 'Teazst22',
    [Password] = 'Tesst',
    [Email] = 'Test@gmail.com',
    [FirstName] = 'Test12',
    [LastName] = 'Work1',
    [BirthDate] = '30/1/1920' 
WHERE [Email] = 'Test@gmail.com'

命令从我的C＃代码执行：

    public static void ChangeTable(string strSql, string FileName)
{
    try
    {
        OleDbConnection c = MakeConnection(FileName);
        OleDbCommand comm = new OleDbCommand();
        comm.CommandText = strSql;
        comm.Connection = c;
        comm.ExecuteNonQuery();
        c.Close();
        System.Diagnostics.Debug.WriteLine("SQL COMMAND Executed");
    }
    catch (Exception e)
    {
        System.Diagnostics.Debug.WriteLine(e.ToString());
    }
}

}

public static OleDbConnection MakeConnection(string dbFile)
{
    OleDbConnection c = new OleDbConnection();

    if (dbFile.ToLower().Contains(".accdb"))
        // MS Access >=2007
        c.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source=" + HttpContext.Current.Server.MapPath("~/App_Data/" + dbFile);
    else
        // MS Access 2003
        c.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" + HttpContext.Current.Server.MapPath("~/App_Data/" + dbFile);

    c.Open();
    return c;

}

 private String Email = "";
private String Username = "";
protected void Page_Load(object sender, EventArgs e)
{
    if ((Session["IsAdmin"] != null && !(bool)Session["IsAdmin"]) || Session["IsAdmin"] == null)
        Response.Redirect("Default.aspx");

   String StrSql = "Select * from [Users] where Email='{0}'";
    StrSql = String.Format(StrSql, Request.QueryString.Get("Em"));
   DataTable Dt=  MyDbase.SelectFromTable(StrSql, "Db.ACCDB");
    if (Dt.Rows.Count == 1)
    {
        USTXT.Text = Dt.Rows[0]["UserName"].ToString();
        PTXT.Text = Dt.Rows[0]["Password"].ToString();
        EmailTXT.Text = Dt.Rows[0]["Email"].ToString();
        FirstNTXT.Text = Dt.Rows[0]["FirstName"].ToString();
        LastNTXT.Text = Dt.Rows[0]["LastName"].ToString();
        BirthDTXT.Text = Dt.Rows[0]["BirthDate"].ToString();
        Email = EmailTXT.Text;
        Username = USTXT.Text;
    }

}
protected void SaveBTN_Click(object sender, EventArgs e)
{
    String StrSql = "Update [Users] Set [UserName]='{0}',[Password]='{1}',[Email]='{2}',[FirstName]='{3}',[LastName]='{4}',[BirthDate]='{5}' WHERE [Email]='{6}'";
    StrSql = String.Format(StrSql, USTXT.Text, PTXT.Text, EmailTXT.Text, FirstNTXT.Text, LastNTXT.Text, BirthDTXT.Text , Email);

    MyDbase.ChangeTable(StrSql,"Db.ACCDB");
    Response.Redirect("Admin.aspx");
}

执行代码时没有显示错误，但是当我检查数据库时，没有任何改变......很简单，命令不起作用。

PS：我使用的数据库是Microsoft Access 2007

Answer 1

请确保您观察的mdb文件位于“Data Directory”文件夹中。你可能正在检查错误的文件。还要检查 mdb 文件的属性，确定其上次修改时间是否与执行数据库操作的时间大致相同。

Answer 2

只需将此代码放入try catch语句中并尝试捕获您的错误..因为我觉得你肯定能以这种方式找到问题

try 
{
    OleDbConnection c = MakeConnection(Database name);
    OleDbCommand comm = new OleDbCommand();
    comm.CommandText = SqlStr;
    comm.Connection = c;
    comm.ExecuteNonQuery();
    c.Close();
}
catch  (Exception e)
{
    Console.WriteLine(e.Message.ToString());
}

Answer 3

您可能有一个区分大小写的db排序规则并且您将大写字母与小写字母进行比较？ https://msdn.microsoft.com/en-us/library/ms144250(v=sql.105).aspx

其中test = Test如果区分大小写，则不会给出任何结果

SQL查询UPDATE无效asp.net

}

3 个答案: