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using System;
using System.Collections.Generic;
using System.Text;
using System.Data.OleDb;
using data = System.Data.OleDb.OleDbDataReader;
namespace Aktywator
{
class OleDbRowMissingException : Exception
{
}
class Sql
{
private OleDbConnection connection;
public Sql(string filename)
{
string connStr = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source=" + filename + ";";
connection = new OleDbConnection(connStr);
connection.Open();
}
public void close()
{
connection.Close();
}
public bool isOpen()
{
if (connection == null) return false;
else return connection.State == System.Data.ConnectionState.Open;
}
public int query(string q)
{
OleDbCommand cmd = new OleDbCommand(q, connection);
return cmd.ExecuteNonQuery();
}
public string selectOne(string q, bool checkForRow = false)
{
OleDbCommand cmd = new OleDbCommand(q, connection);
object o = cmd.ExecuteScalar();
if (o == null) // it's null if the row does not exist, it'd be DBNull.Value if NULL was the value in existing row
{
if (!checkForRow)
{
return "";
}
throw new OleDbRowMissingException();
}
return o.ToString();
}
public data select(string q)
{
OleDbCommand cmd = new OleDbCommand(q, connection);
return cmd.ExecuteReader();
}
public bool checkTableExists(string tableName)
{
try
{
selectOne("select count(*) from " + tableName);
}
catch (OleDbException)
{
return false;
}
return true;
}
public bool checkFieldExists(string tableName, string fieldName)
{
try
{
selectOne("select " + fieldName + " from " + tableName);
}
catch (OleDbException)
{
return false;
}
return true;
}
}
}
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