dbAccess.cs

dbAccess.cs Text

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
namespace ADO.W1
{
    public partial class dbAccess
    {
        private string connS = "";
        public dbAccess()
        {
            connS = System.Configuration.ConfigurationManager.ConnectionStrings["Test"].ToString();

        }

        // UPDATE
        public bool UPDATE(string sql)
        {

            SqlConnection conn = new SqlConnection(connS);
            SqlCommand cmd = new SqlCommand(sql,conn);

            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
                return true;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                return false;

            }
            finally
            {

                conn.Close();
                cmd.Dispose();
                conn.Dispose();
            }

        }

        // SELECT
        public DataTable SELECT(string sql)
        {

            SqlDataAdapter da = new SqlDataAdapter(sql,connS);
            DataTable dt = new DataTable("info");

            try
            {
                da.Fill(dt);
                int r = dt.Rows.Count;
                return dt;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                return null;
            }
            finally
            {
                da.Dispose();
                dt.Dispose();
            }
        }

        //SELECT FROM READER
        public DataTable SELECT_READER(string sql) {

            SqlConnection conn = new SqlConnection(connS);
            SqlCommand cmd = new SqlCommand(sql, conn);
            DataTable dt = new DataTable("info");
            SqlDataReader rd = null;
            try
            {
                conn.Open();
                rd = cmd.ExecuteReader();
                dt = GetReaderTable(rd.GetSchemaTable());
                object[] array = new object[dt.Columns.Count];

                while (rd.Read())
                {
                    for (int i = 0; i < dt.Columns.Count; i++)
                    {
                        array[i] = rd.GetValue(i);
                    }

                    dt.Rows.Add(array);

                }

                return dt;
               
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                return null;
            }
            finally {

                conn.Close();
                rd.Dispose();
                conn.Dispose();
                dt.Dispose();
                cmd.Dispose();
            }
        }

        private DataTable GetReaderTable(DataTable pdt) {

            DataTable dt = new DataTable("info");

            for (int i = 0; i < pdt.Rows.Count; i++)
            {
                dt.Columns.Add(pdt.Rows[i][0].ToString());
            }

            return dt;
        }


        //SELECT FROM REDER_REDER
        public SqlDataReader SELECT_READER(string sql,bool mode)
        {
            SqlConnection conn = new SqlConnection(connS);
            SqlCommand cmd = new SqlCommand (sql,conn);
            try
            {
                conn.Open();
                SqlDataReader rd =  cmd.ExecuteReader();
                int dep = rd.Depth;
                return rd;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                return null;

            }
            finally {

                conn.Close();
                cmd.Dispose();
                conn.Dispose();
            }
        }
    }
}