DbHelper,SqlHelper操作类

上篇文章中提到了网上流传的DbHelper（SqlHelper）类的问题，现在贴上修正版本。

using System;

using System.Collections.Generic;

using System.Text;

using System.Data.SqlClient;

using System.Web;

using System.Configuration;

using System.Data;

using XueBa.Config;



namespace XueBa.SqlServer

{

    public class DbHelper

    {

        public static readonly string ConnectionString = @"Data Source=(local)\SQLEXPRESS;Initial Catalog=XueBa;Persist Security Info=True;User ID=sa;Password=********";



        public static SqlConnection getConnection()

        {

            return new SqlConnection(ConnectionString);

        }



        public static int ExecuteNonQuery(String sqlText)

        {

            SqlCommand cmd = new SqlCommand();

            using (SqlConnection conn = new SqlConnection(ConnectionString))

            {

                conn.Open();

                cmd.Connection = conn;

                cmd.CommandText = sqlText;

                int value = cmd.ExecuteNonQuery();

                return value;

            }

        }

public static SqlDataReader ExecuteReader(String sqlText, SqlConnection conn)

        {

            SqlCommand cmd = new SqlCommand();

            try

            {

                conn.Open();

                cmd.Connection = conn;

                cmd.CommandText = sqlText;

                SqlDataReader reader = cmd.ExecuteReader();

                return reader;

            }

            catch (Exception e)

            {

                

                conn.Close();

                throw e;

               // return null;

            }

        }



        public static DataSet ExecuteDataSet(String sqlText)

        {

            SqlCommand cmd = new SqlCommand();

            DataSet ds = new DataSet();

            using (SqlConnection conn = new SqlConnection(ConnectionString))

            {

                conn.Open();

                cmd.Connection = conn;

                cmd.CommandText = sqlText;

                using (SqlDataAdapter da = new SqlDataAdapter())

                {

                    da.SelectCommand = cmd;

                    da.Fill(ds);

                    return ds;

                }

            }

        }



        public static DataTable ExecuteDataTable(String sqlText)

        {

            SqlCommand cmd = new SqlCommand();

            DataTable dt = new DataTable();

            using (SqlConnection conn = new SqlConnection(ConnectionString))

            {

                conn.Open();

                cmd.Connection = conn;

                cmd.CommandText = sqlText;

                using (SqlDataAdapter da = new SqlDataAdapter())

                {

                    da.SelectCommand = cmd;

                    da.Fill(dt);

                    return dt;

                }

            }

        }



        public static int getSingleInt(String sqlText)

        {

            SqlCommand cmd = new SqlCommand();

            SqlConnection conn = new SqlConnection(ConnectionString);

            try

            {

                conn.Open();

                cmd.Connection = conn;

                cmd.CommandText = sqlText;

                SqlDataReader reader = cmd.ExecuteReader();

                reader.Read();

                if (reader.IsDBNull(0))

                    return 0;

                else

                    return reader.GetInt32(0);

            }

            catch (Exception e)

            {

                conn.Close();

                return -1;

            }

            finally { conn.Close(); }

        }

    }

}