c#数据库帮助类SqlHelper

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.OleDb;
using System.Data;
using System.Configuration;
using System.Data.Sql;
using System.Data.SqlClient;
namespace DAL
{
    public class SqlHelper
    {
        public static string connstring = ConfigurationManager.ConnectionStrings["zzconstr"].ConnectionString;
        //public static string connstring = "Data Source=ZZ-PC;Initial Catalog=IPTVDB;User ID=sa;Password=sa";
        /// <summary>
        /// 执行非查询，返回受影响行数,异常返回-1；
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="type"></param>
        /// <param name="pars"></param>
        /// <returns></returns>
        public static bool ExceNonQuery(string sql, CommandType type, IDataParameter[] pars)
        {
            
            SqlConnection con = new SqlConnection(connstring);
            SqlCommand com = new SqlCommand(sql, con);
            
            if (pars != null && pars.Length > 0)
            {
                foreach (SqlParameter pp in pars)//把参数集全部加进去
                    com.Parameters.Add(pp);
            }
            try
            {
                con.Open();
                int t = com.ExecuteNonQuery();
                if (t > 0)
                {
                    return true;
                }
                else
                    return false;
            }
            catch (Exception e) { return false; }
            finally
            {
                com.Parameters.Clear();
                com.Dispose();
                con.Close();
            }
        }
        /// <summary>
        /// 执行sql语句的查询，返回查询的数量。异常返回-1.
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="type"></param>
        /// <param name="pars"></param>
        /// <returns></returns>
        public static int ExceQuery(string sql, CommandType type, IDataParameter[] pars)
        {
            SqlConnection con = new SqlConnection(connstring);
            SqlCommand com = new SqlCommand(sql, con);
            com.CommandType = type;
            if (pars != null && pars.Length > 0)
            {
                foreach (SqlParameter pp in pars)//把参数集全部加进去
                    com.Parameters.Add(pp);
            }
            try
            {
                con.Open();
                if (com.ExecuteScalar() != null)//查询结果为空时返回0
                {
                    int t = (int)com.ExecuteScalar();

                    return t;
                }
                else
                    return -1;
            }
            catch (Exception e) { return -1; }
            finally
            {
                com.Parameters.Clear();
                com.Dispose();
                con.Close();
            }
        }
        /// <summary>
        /// 执行查询，返回一个数据集
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="pars"></param>
        /// <returns></returns>
        public static DataSet ExcueReturnDataset(string sql, IDataParameter[] pars)
        {
            SqlConnection con = new SqlConnection(connstring);
            DataSet set = new DataSet();
            SqlCommand com = new SqlCommand(sql, con);
            if (pars != null && pars.Length > 0)
            {
                foreach (SqlParameter pp in pars)//把参数集全部加进去
                    com.Parameters.Add(pp);
            }
            
            SqlDataAdapter adpter = new SqlDataAdapter(com);
            
            try
            {
                set.Clear();
                adpter.Fill(set);
                return set;
            }
            catch (Exception ex) { return null; }
            finally {
                com.Parameters.Clear();
                com.Dispose();
                con.Close(); 
            }

        }
        public static DataSet ExcueReturnDataset(string sql,CommandType type,IDataParameter[] pars)
        {
            SqlConnection con = new SqlConnection(connstring);
            DataSet set = new DataSet();
            SqlCommand com = new SqlCommand(sql, con);
            com.CommandType = type;
            if (pars != null && pars.Length > 0)
            {
                foreach (SqlParameter pp in pars)//把参数集全部加进去
                    com.Parameters.Add(pp);
            }

            SqlDataAdapter adpter = new SqlDataAdapter(com);

            try
            {
                set.Clear();
                adpter.Fill(set);
                return set;
            }
            catch (Exception ex) { return null; }
            finally
            {
                com.Parameters.Clear();
                com.Dispose();
                con.Close();
            }

        }
        public static IDataReader ExcueReturnDataReader(string sql, IDataParameter[] pars)
        {
            SqlConnection con = new SqlConnection(connstring);
            SqlCommand com = new SqlCommand(sql, con);
            
            SqlDataReader reader;
            if (pars != null && pars.Length > 0)
            {
                foreach (SqlParameter pp in pars)//把参数集全部加进去
                    com.Parameters.Add(pp);
            }
            try
            {
                con.Open();
                reader = com.ExecuteReader(CommandBehavior.CloseConnection);
                return reader;
            }
            catch (Exception ex)
            { 
                
                return null; 
            }
            finally {
                com.Parameters.Clear();
                com.Dispose();
                //con.Close();
            }

        }
        /// <summary>
        /// 执行存储过程，返回影响的行数		
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <param name="rowsAffected">影响的行数</param>
        /// <returns></returns>
        public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected)
        {
            using (SqlConnection connection = new SqlConnection(connstring))
            {
                int result;
                connection.Open();
                SqlCommand command = new SqlCommand(storedProcName, connection);
                command.CommandType = CommandType.StoredProcedure;
                if (parameters!= null && parameters.Length > 0)
                {
                    foreach (SqlParameter pp in parameters)//把参数集全部加进去
                        command.Parameters.Add(pp);
                }
                command.Parameters.Add("@return","").Direction = ParameterDirection.ReturnValue;
                rowsAffected = command.ExecuteNonQuery();
                result = (int)command.Parameters["@return"].Value;
                connection.Close();
                return result;
            }
        }
        /// <summary>
        /// 执行存储过程
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <param name="tableName">DataSet结果中的表名</param>
        /// <returns>DataSet</returns>
        public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
        {
            using (SqlCo
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