连接时到是da.fill（ds）错误！！
程序代码：
public class dbbase
{
//static readonly string connstr = ConfigurationSettings.AppSettings["connstr"].ToString();
//static readonly string connstr = "server=.;database=student;uid=sa;pwd=";
//static readonly string connstr = System.Configuration.ConfigurationManager.AppSettings["connstr"].ToString();
static readonly string connstr = "Data Source=(local);Initial Catalog=|DataDirectory|GRADE.mdf;Integrated Security=SSPI";
public dbbase()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
public static DataTable getDataTable(string sqlstr)
{
SqlConnection conn = new SqlConnection(connstr);
SqlDataAdapter da = new SqlDataAdapter(sqlstr,conn);
DataSet ds =new DataSet();
da.Fill(ds);
return ds.Tables[0];
}
public static void ExecuteSql(string sqlstr)
{
SqlConnection conn = new SqlConnection(connstr);
SqlCommand cmd = new SqlCommand(sqlstr,conn);
conn.Open();
cmd.ExecuteNonQuery();
conn.Close();
}
public static void UpdateDt(DataTable changedDt, string sqlstr)
{
SqlConnection conn = new SqlConnection(connstr);
SqlDataAdapter da = new SqlDataAdapter(sqlstr, conn);
SqlCommandBuilder sqlCmdBuilder = new SqlCommandBuilder(da);
da.Update(changedDt);
changedDt.AcceptChanges();
}
public static DataSet getDataSet(string sql)
{
SqlConnection conn = new SqlConnection(connstr);
SqlDataAdapter da = new SqlDataAdapter(sql, conn);
DataSet ds = new DataSet();
da.Fill(ds);
return ds;
}
}
}
应该没错误才对啊！我数据库是放在App_Data里面的！！
