Connection strings for Access databases and database operations classes

<!--Access database connection mode--
<add name= "qytangconnectionstring" connectionstring= "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=| datadirectory| Test.mdb "providername=" System.Data.OleDb "/>

Using System;
Using System.Data;
Using System.Data.OleDb;
Using System.Configuration;

Namespace Qytang.gengerate
{
<summary>
OLE DB Operation class
</summary>
Public abstract class Opoledb
{
<summary>
Get database query string
</summary>
public static string connstr = configurationmanager.connectionstrings["qytangconnectionstring"]. ToString ();

<summary>
Gets the dataset based on a SQL
</summary>
<param name= "Con" > Database connection string </param>
<param name= "Cmdtext" >sql statement </param>
<param name= "parms" > Parameter list </param>
<returns>Dataset</returns>
public static DataSet GetDataSet (string con, String cmdtext, oledbparameter[] parms)
{
DataSet ds = new DataSet ();
OleDbCommand cmd = new OleDbCommand ();

OleDbConnection conn = new OleDbConnection (con);
OleDbDataAdapter da = new OleDbDataAdapter ();
PrepareCommand (CMD, conn, CommandType.Text, Cmdtext, parms);
Da. SelectCommand = cmd;
Da. Fill (DS);
Cmd. Parameters.clear ();
IF (Conn. state = = ConnectionState.Open)
Conn. Close ();
return DS;
}

<summary>
Read DataReader
</summary>
<param name= "Con" > Database connection string </param>
<param name= "Cmdtext" >sql statement </param>
<param name= "parms" > Parameter list </param>
<returns>DataReader</returns>
public static OleDbDataReader Getdataread (OleDbConnection conn, string Cmdtext, oledbparameter[] parms)
{
OleDbCommand cmd = new OleDbCommand ();
PrepareCommand (CMD, conn, CommandType.Text, Cmdtext, parms);
OleDbDataReader dr = cmd. ExecuteReader (commandbehavior.closeconnection);
Cmd. Parameters.clear ();
Return Dr;
}

<summary>
Insert, update, or delete operations
</summary>
<param name= "Con" > Database connection string </param>
<param name= "Cmdtext" >sql statement </param>
<param name= "parms" > Parameter list </param>
<returns> number of rows accepted for adjustment </returns>
public static int Query (string con, String cmdtext, oledbparameter[] parms)
{
OleDbCommand cmd = new OleDbCommand ();
OleDbConnection conn = new OleDbConnection (con);
PrepareCommand (CMD, conn, CommandType.Text, Cmdtext, parms);
int val = cmd. ExecuteNonQuery ();
Cmd. Parameters.clear ();
IF (Conn. state = = ConnectionState.Open)
Conn. Close ();
return Val;
}

Prepare for data queries
static void PrepareCommand (OleDbCommand cmd, OleDbConnection conn, CommandType Cmdtype, String cmdtext, oledbparameter[] Parms
{
IF (Conn. State = ConnectionState.Open)
Conn. Open ();
Cmd. Connection = conn;
Cmd.commandtext = Cmdtext;
Cmd.commandtype = Cmdtype;
if (parms! = null)
{
for (int i = 0; i < parms. Length; i++)
Cmd. Parameters.Add (Parms[i]);
}
}
}
}

Connection strings for Access databases and database operations classes