DAL/SqlHelper.cs

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

namespace DAL
{
    public class SqlHelper
    {
        static string strcn = ConfigurationManager.ConnectionStrings["Card"].ConnectionString;

        /// <summary>
        /// 第一行第一列的值
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <param name="sp">参数数组</param>
        /// <returns>返回结果集中第一行第一列的值</returns>
        public static object GetObj(string sql, params SqlParameter[] sp)
        {
            SqlConnection conn = new SqlConnection(strcn);
            SqlCommand cmd = new SqlCommand(sql, conn);
            foreach (SqlParameter sps in sp)
            {
                cmd.Parameters.Add(sps);
            }
            conn.Open();
            object obj = cmd.ExecuteScalar();
            conn.Close();
            return obj;
        }

        /// <summary>
        /// 查询的操作
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <param name="sp">参数数组</param>
        /// <returns>返回结果集</returns>
        public static SqlDataReader GetRead(string sql, params SqlParameter[] sp)
        {
            SqlConnection conn = new SqlConnection(strcn);
            SqlCommand cmd = new SqlCommand(sql, conn);
            foreach (SqlParameter sps in sp)
            {
                cmd.Parameters.Add(sps);
            }
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            return dr;
        }

        /// <summary>
        /// 增删改的操作
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <param name="sp">参数数组</param>
        /// <returns>返回受影响的行数</returns>
        public static int Commit(string sql, params SqlParameter[] sp)