sqlhelper帮助类

  public class SQLHelperNew
    {

        //连接字符串
        private static readonly string ConnStr = System.Configuration.ConfigurationManager.ConnectionStrings["conStr"].ConnectionString;



        /// <summary>
        /// 返回SqlDataReader
        /// </summary>
        /// <param name="sql">连接字符串</param>
        /// <param name="cmdParms">CMD参数集合</param>
        /// <returns></returns>
        public static SqlDataReader ExecuteReader(string sql, params SqlParameter[] cmdParms)
        {
            using (SqlConnection con = new SqlConnection(ConnStr))
            {
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    con.Open();
                    if (cmdParms.Count() > 0)
                    {
                        cmd.Parameters.AddRange(cmdParms);
                    }
                    try
                    {
                        return cmd.ExecuteReader(CommandBehavior.CloseConnection);
                    }
                    catch (System.Data.SqlClient.SqlException e)
                    {
                        throw e;
                    }
                    finally
                    {
                        con.Close();
                        cmd.Dispose();
                    }
                }
            }
        }

        /// <summary>
        /// 返回数据表
        /// </summary>
        /// <param name="sql">连接字符串</param>
        /// <param name="cmdParms">CMD参数集合</param>
        /// <returns></returns>
        public static DataTable ExecuteDataTable(string sql, params SqlParameter[] cmdParms)
        {
            using (SqlConnection con = new SqlConnection(ConnStr))
            {
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    DataTable dt = new DataTable();
                    if (cmdParms.Count() > 0)
                    {
                        cmd.Parameters.AddRange(cmdParms);
                    }
                    try
                    {
                        con.Open();
                        SqlDataAdapter rd = new SqlDataAdapter(cmd);
                        rd.Fill(dt);
                        return dt;
                    }
                    catch (System.Data.SqlClient.SqlException e)
                    {
                        throw e;
                    }
                    finally
                    {
                        con.Close();
                        cmd.Dispose();
                    }
                }
            }
        }

        /// <summary>
        /// 返回受影响的行数
        /// </summary>
        /// <param name="sql">连接字符串</param>
        /// <param name="cmdParms">CMD参数集合</param>
        /// <returns></returns>
        public static int ExecuteNonQuery(string sql, params SqlParameter[] cmdParms)
        {
            using (SqlConnection con = new SqlConnection(ConnStr))
            {
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    con.Open();
                    if (cmdParms.Count() > 0)
                    {
                        cmd.Parameters.AddRange(cmdParms);
                    }
                    try
                    {
                        return cmd.ExecuteNonQuery();
                    }
                    catch (System.Data.SqlClient.SqlException e)
                    {
                        throw e;
                    }
                    finally
                    {
                        con.Close();
                        cmd.Dispose();
                    }
                }
            }
        }

        /// <summary>
        /// 返回首行首列
        /// </summary>
        /// <param name="sql">连接字符串</param>
        /// <param name="cmdParms">CMD参数集合</param>
        /// <returns></returns>
        public static object ExecuteScalar(string sql, params SqlParameter[] cmdParms)
        {
            using (SqlConnection con = new SqlConnection(ConnStr))
            {
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    con.Open();
                    if (cmdParms.Count() > 0)
                    {
                        cmd.Parameters.AddRange(cmdParms);
                    }
                    try
                    {
                        return cmd.ExecuteScalar();
                    }
                    catch (System.Data.SqlClient.SqlException e)
                    {
                        throw e;
                    }
                    finally
                    {
                        con.Close();
                        cmd.Dispose();
                    }
                }
            }
        }
    }
}