如何获取数据库架构

最近 关注了一款数据层映射生成工具,其中对它能自动识别数据库中的表以及表中的字段一直为惑不解.干脆用ILDASM直接的慢慢的仔细的看了下它的原代码,总算明白了
其实代码不长,很简单如下

private void button1_Click(object sender, System.EventArgs e)         {                OleDbConnection con=new OleDbConnection() ;             TreeNode root=new TreeNode("数据库");             try             {                                con.ConnectionString="Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=Northwind;Data Source=.";                 con.Open();                             DataTable dt=con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables ,                     new object[] { null, null, null, "TABLE" });                             //  查看莫一个表中的所有字段                 OleDbDataReader read=null;                 OleDbCommand cmd=null;                             TreeNode tnd;                 for (int i=0;i<dt.Rows.Count;i++)                 {                     tnd=new TreeNode(dt.Rows[i]["TABLE_NAME"].ToString());                     string sql="select * from ";                     sql=string.Concat(new string[]{sql,"[",dt.Rows[i]["TABLE_NAME"].ToString(),"]"," WHERE 1=-1"});                     cmd=new OleDbCommand(sql,con);                     read=cmd.ExecuteReader();                     for (int j=0; j<read.FieldCount;j++)                     {                         TreeNode tn=new TreeNode(read.GetName(j));                         tnd.Nodes.Add(tn);                     }                     read.Close();                     cmd.Dispose();                     root.Nodes.Add(tnd);                                    }                                }                catch(Exception e1)             {                 MessageBox.Show(e1.Message);             }             finally             {                 con.Close();                 this.treeView1.Nodes.Add(root);             }                     }             }

基本上如此,有些界面的代码,改改就好了
效果如下