我在我的asp.net应用程序中使用简单的SELECT语句有奇怪的问题。我与MSSQL工作,2008年无法在nvarchar上调用方法
此语句的工作原理:
SelectSQL = "SELECT user_id, user_name, user_surname, user_code FROM Users WHERE user_group = '" + drop.SelectedItem.Value + "'";
然而,这条线抛出
SelectSQL = "SELECT COUNT(DISTINCT Equations.eq_id) AS pocet_prikladu, Users.user_name, User.user_surname FROM Users LEFT JOIN Equations ON (Users.user_id = Equations.eq_user_id) WHERE Users.user_code = '" + drop.SelectedItem.Value + "' GROUP BY Users.user_id, Users.user_name, User.user_surname ";
这里更多的代码,它停止 “不能调用nvarchar的方法”。在最后一行
public void FillTable(Table tab, DropDownList drop) //naplneni tabulky
{
SqlConnection pripojeni = new SqlConnection(connectionString);
string SelectSQL = "";
if (action == "groups")
{
SelectSQL = "SELECT user_id, user_name, user_surname, user_code FROM Users WHERE user_group = '" + drop.SelectedItem.Value + "'";
}
else
{
SelectSQL = "SELECT COUNT(DISTINCT Equations.eq_id) AS pocet_prikladu, Users.user_name, User.user_surname FROM Users LEFT JOIN Equations ON (Users.user_id = Equations.eq_user_id) WHERE Users.user_code = '" + drop.SelectedItem.Value + "' GROUP BY Users.user_id, Users.user_name, User.user_surname ";
}
try
{
SqlCommand prikaz = new SqlCommand(SelectSQL, pripojeni);
pripojeni.Open();
SqlDataReader vysledky = prikaz.ExecuteReader();
能否请您发布更完整的代码示例,包括你如何将查询发送到SQL? – jklemmack 2012-04-15 21:22:07
你有一个错字 - User.user_surname应该是Users.user_surname – 2012-04-15 21:27:10
谢谢克里斯。它现在有效。通过寻找解决方案花费的另一个浪费时间:D – polohy 2012-04-15 21:29:45