问题beetwen的表关系
我有3个表:
tb_plane tb_attributes tb_as_plane_attributes
plane_id attribute_id plane_attribute_id
plane_name attribute_name FK_plane_id
FK_attribute_id
value
我想的是平面与属性，并设置每个属性的值。我我填充与所有plane_name的的组合:
{C}
现在，我想从tb_attributes ATTRIBUTE_NAME所有属性来填充一个DataGrid。一coulmn所有ATTRIBUTE_NAME列第二 - 价值。我想我想涉及与飞机的按一下按钮，使关系，并保存到表tb_as_plane_attributes这个属性设定值。不保存在assocation表其余的属性，我不把值。在最后一个按钮的Click事件接受。
我尝试，使这项工作，但我有问题。我尝试实施的DataGrid:private void PopulateGridByAttributes()
{
try
{
string ConnectionString = conSettings.ConnectionString;
DataSet dataSet = new DataSet();
using (SqlConnection connection = new SqlConnection(ConnectionString))
{
connection.Open();
using (SqlCommand command = new SqlCommand())
{
command.Connection = connection;
using (SqlDataAdapter dataAdapter = new SqlDataAdapter(command))
{
command.CommandText = ("SELECT attribute_id, attribute_name FROM tb_attributes");
dataAdapter.Fill(dataSet, "tb_attributes");
GrdAllAttributes.Columns.Add("attribute_name", "name of attribute");
GrdAllAttributes.Columns.Add("dd", "Value");
int row = dataSet.Tables["tb_attributes"].Rows.Count - 1;
for (int r = 0; r <= row; r++)
{
GrdAllAttributes.Rows.Add();
GrdAllAttributes.Rows[r].Cells[0].Value = dataSet.Tables["tb_Atributtes"].Rows[r].ItemArray[1]; //attribute_name
}
}
}
connection.Close();
}
}
catch (System.Data.SqlClient.SqlException ex)
{
string str;
str = "Source:" + ex.Source;
str += "\n" + "Message:" + ex.Message;
MessageBox.Show(str, "Database Exception");
}
catch (System.Exception ex)
{
string str;
str = "Source:" + ex.Source;
str += "\n" + "Message:" + ex.Message;
MessageBox.Show(str, "Generic Exception");
}
finally
{
}
}
希望这有助于