自各儿写的一个sqlhelper

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration ;
using System.Data;
using System.Data.SqlClient ;

namespace ADOTest
{
    class SQLHelper
    {
        private static string conStr = ConfigurationManager.ConnectionStrings["conStr"].ConnectionString;
        /// <summary>
        /// 增，删，改，返回多行结果
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="pms"></param>
        /// <returns></returns>
        public static int ExcuteNonQuery(string sql,params SqlParameter [] pms )
        {
            using (SqlConnection con = new SqlConnection(conStr))
            {
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    if (pms!=null)
                    {
                        cmd.Parameters.AddRange(pms);
                    }
                    con.Open();
                    return cmd.ExecuteNonQuery();
                }
            }
        }

        /// <summary>
        /// 增，删，改，返回一行一列的结果
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="pms"></param>
        /// <returns></returns>
        public static object ExcuteScalar(string sql, params SqlParameter[] pms)
        {
            using (SqlConnection con = new SqlConnection(conStr))
            {
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    if (pms!=null)
                    {
                        cmd.Parameters.AddRange(pms);
                    }
                    con.Open();
                    return cmd.ExecuteScalar();
                }
            }
        }

        /// <summary>
        /// 执行返回SqlDataReader
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="pms"></param>
        /// <returns></returns>
        public static SqlDataReader ExecuteReader(string sql, params SqlParameter[] pms)
        {
          
             SqlConnection con = new SqlConnection(conStr);
           
              
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                   
                    if (pms!=null)
                    {
                        cmd.Parameters.AddRange(pms);

                    }
                    con.Open();
                    return cmd.ExecuteReader(CommandBehavior.CloseConnection);
                }
           
        }

        /// <summary>
        /// 返回一个DataTable
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="pms"></param>
        /// <returns></returns>
        public static DataTable ExecuteDataTable(string sql, params SqlParameter[] pms)
        {
            using (SqlConnection con = new SqlConnection (conStr))
            {
             
                using (SqlDataAdapter adapter = new SqlDataAdapter (sql,con))
                {
                    if (pms!=null)
                    {
                        adapter.SelectCommand.Parameters.AddRange(pms);
                    }
                    DataTable dt = new DataTable();
                    adapter.Fill(dt);
                    return dt;
                }
            }
        }

    }
}