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DB.cs
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DB.cs
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using System;
using System.Collections.Generic;
using System.Data;
using System.Data.OleDb;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace DotNet_Messaging
{
class DB
{
private static OleDbConnection connection;
public static OleDbConnection OpenConnection(string ConnectionString)
{
if (connection == null)
{
connection = new OleDbConnection();
}
connection.ConnectionString = ConnectionString;
if (connection.State != ConnectionState.Open)
{
connection.Open();
}
return connection;
}
public static OleDbConnection OpenConnection()
{
if (connection == null)
{
connection = new OleDbConnection();
string Path = System.IO.Path.GetDirectoryName(System.IO.Path.GetDirectoryName(System.IO.Directory.GetCurrentDirectory()));
connection.ConnectionString = " Provider = Microsoft.ACE.OLEDB.12.0;Data Source=" + Path + "\\sms.accdb;";
//connection.ConnectionString = " Provider = Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|sms.accdb;";
}
if (connection.State != ConnectionState.Open)
{
connection.Open();
}
return connection;
}
public static DataTable Select(string query)
{
DataTable dt = new DataTable();
OleDbDataAdapter adapter = new OleDbDataAdapter(query, OpenConnection());
adapter.Fill(dt);
connection.Close();
return dt;
}
public static OleDbDataReader SelectFirst(string query)
{
OleDbCommand cmd = connection.CreateCommand();
cmd.CommandText = query;
cmd.Connection = OpenConnection();
OleDbDataReader reader = cmd.ExecuteReader(CommandBehavior.SingleResult);
//connection.Close();
return reader;
}
public static bool Query(string query)
{
OleDbCommand cmd = connection.CreateCommand();
cmd.CommandText = query;
cmd.Connection = OpenConnection();
cmd.ExecuteNonQuery();
connection.Close();
return true;
}
}
}