(A few new demos recently) (right-click the Treeview). It is more useful in subsequent updates.

Front-endCode

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Background code

Using system;
Using system. Collections. Generic;
Using system. LINQ;
Using system. text;
Using system. Data;
Using system. Data. sqlclient;

Namespace windows_dal
{
Public class treeview_dal
{
Static sqlconnection myconnection = new sqlconnection ("Server =.; database = windows_test; uid = sa; Pwd = 1 ");
Public static datatable getmenutodatatable ()
{
String SQL = "select * From sysmenutree ";
Return dbtools. DB. executedataset (commandtype. Text, SQL). Tables [0];
}
Public static bool update_treeview (string ID, string text)
{
Myconnection. open ();
Sqltransaction mytrans = myconnection. begintransaction ();
Sqlcommand mycommand = new sqlcommand ();
Mycommand. Connection = myconnection;
Mycommand. Transaction = mytrans;
Int COUNT = 0;
Try
{
String SQL = string. Format ("Update sysmenutree set stext = '{0}' Where noteid = '{1}'", text, ID );
Mycommand. commandtext = SQL;
Count = mycommand. executenonquery ();
// Dbtools. DB. executenonquery (commandtype. Text, SQL );
Mytrans. Commit ();
}
Catch (exception)
{
Mytrans. rollback ();
}
Finally
{
Myconnection. Close ();
}
Return count> 0? True: false;
}

Public static bool add_treeview (string ID, string text)
{
Myconnection. open ();
Sqltransaction mytrans = myconnection. begintransaction ();
Sqlcommand mycommand = new sqlcommand ();
Mycommand. Connection = myconnection;
Mycommand. Transaction = mytrans;
Int COUNT = 0;
Try
{
String SQL = string. format ("insert into sysmenutree values ('{0}', '{1}','', '')", ID, text );
Mycommand. commandtext = SQL;
Count = mycommand. executenonquery ();
// Dbtools. DB. executenonquery (commandtype. Text, SQL );
Mytrans. Commit ();
}
Catch (exception)
{
Mytrans. rollback ();
}
Finally
{
Myconnection. Close ();
}
Return count> 0? True: false;
// String SQL = string. format ("insert into sysmenutree values ('{0}', '{1}','', '')", ID, text );
// Return dbtools. DB. executenonquery (commandtype. Text, SQL)> 0? True: false;
}
Public static bool add_treeview (string text)
{
Myconnection. open ();
Sqltransaction mytrans = myconnection. begintransaction ();
Sqlcommand mycommand = new sqlcommand ();
Mycommand. Connection = myconnection;
Mycommand. Transaction = mytrans;
Int COUNT = 0;
Try
{
String SQL = string. format ("insert into sysmenutree values ('0', '{0}','', '')", text );
Mycommand. commandtext = SQL;
Count = mycommand. executenonquery ();
// Dbtools. DB. executenonquery (commandtype. Text, SQL );
Mytrans. Commit ();
}
Catch (exception)
{
Mytrans. rollback ();
}
Finally
{
Myconnection. Close ();
}
Return count> 0? True: false;
// String SQL = string. format ("insert into sysmenutree values ('{0}', '{1}','', '')", ID, text );
// Return dbtools. DB. executenonquery (commandtype. Text, SQL)> 0? True: false;
}

Public static int del_treeview (string ID)
{
String SQL = string. Format ("select count (*) from sysmenutree where parentid = '{0}'", ID );
If (INT) dbtools. DB. executescalar (commandtype. Text, SQL)> 0)
{
Return 3;
}
Else
{
Myconnection. open ();
Sqltransaction mytrans = myconnection. begintransaction ();
Sqlcommand mycommand = new sqlcommand ();
Mycommand. Connection = myconnection;
Mycommand. Transaction = mytrans;
Int COUNT = 0;
Try
{
SQL = string. Format ("delete sysmenutree where noteid = '{0}'", ID );
Mycommand. commandtext = SQL;
Count = mycommand. executenonquery ();
// Dbtools. DB. executenonquery (commandtype. Text, SQL );
Mytrans. Commit ();
}
Catch (exception)
{
Mytrans. rollback ();
}
Finally
{
Myconnection. Close ();
}
Return count> 0? 1: 2;
// SQL = string. Format ("delete sysmenutree where noteid = '{0}'", ID );
// Return dbtools. DB. executenonquery (commandtype. Text, SQL)> 0? True: false;
}
}
}
}

Database Design

Noteid parentid stext

1 0 pharmaceutical experts

2 1 traditional Chinese medicine

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