我遇到了错误,我也不知道代码有什么问题,所以如果有人可以帮助我,我将不胜感激。
错误:
突出显示的行是
rdr = cmd.ExecuteReader();
码:
cn.Open();
string query = "SELECT * FROM dbo.ispiti WHERE poID=@poID, sgID=@sgID, npID=@npID";
SqlCommand cmd = new SqlCommand(query, cn);
cmd.Parameters.AddWithValue("@poID", pr);
cmd.Parameters.AddWithValue("@sgID", pr1);
cmd.Parameters.AddWithValue("@npID", pr2);
SqlDataReader rdr;
try
{
rdr = cmd.ExecuteReader();
if (rdr.Read())
{
MessageBox.Show("Well done!");
}
}
catch(exception ex)
{
MessageBox.Show("Error!");
}
finally
{
cn.Close();
}
最佳答案
您的SQL语句中有错误。你应该改变
string query = "SELECT * FROM dbo.ispiti WHERE poID=@poID, sgID=@sgID, npID=@npID";
至
string query = "SELECT * FROM dbo.ispiti WHERE poID=@poID AND sgID=@sgID AND npID=@npID";