C# 对数据库操作的帮助类SQLHelper.cs

using System;

using System.Collections.Generic;

using System.Configuration;

using System.Data;

using System.Data.SqlClient;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

 

namespace RuPengWang.DAL

{

    public class SqlHelper

    {

        private static readonly string constr = ConfigurationManager.AppSettings["constr"];

 

       

        /// <summary>

        /// 数据表的增、删、改；

        /// </summary>

        /// <param name="conn"></param>

        /// <param name="sql"></param>

        /// <param name="sp"></param>

        /// <returns></returns>

        public static int ExecuteNonQuery(string sql, params SqlParameter[] sp)

        {

            using (SqlConnection con = new SqlConnection(SqlHelper.constr))

            {

                

                return SqlHelper.ExecuteNonQuery(con, sql, sp);

            }

 

        }

 

        public static int ExecuteNonQuery(SqlConnection conn, string sql, params SqlParameter[] ps)

        {

            using (SqlCommand cmd = new SqlCommand(sql, conn))

            {

                conn.Open();

                cmd.Parameters.AddRange(ps);

               return cmd.ExecuteNonQuery();

            }

        }

 

        /// <summary>

        /// 执行一条返回第一条记录第一列的SqlCommand命令，通过专用的连接字符串。

        /// 使用参数数组提供参数

        /// </summary>

        /// <param name="conn"></param>

        /// <param name="sql"></param>

        /// <param name="ps"></param>

        /// <returns>返回一个object数据</returns>

        public static object ExecuteScale(SqlConnection conn,string sql, params SqlParameter[] ps)

        {

            using (SqlCommand cmd = new SqlCommand(sql, conn))

            {

                conn.Open();

                cmd.Parameters.AddRange(ps);

                return cmd.ExecuteScalar();

            }

         

        }

        /// <summary>

        /// 执行一条返回第一条记录第一列的SqlCommand命令，通过专用的连接字符串。

        /// 使用参数数组提供参数

        /// </summary>

        /// <param name="sql">sql语句</param>

        /// <param name="ps">参数</param>

        /// <returns>返回一个object数据</returns>

        public static object ExecuteScale(string sql, params SqlParameter[] ps)

        {

            using (SqlConnection conn = new SqlConnection(SqlHelper.constr))

            {

                return SqlHelper.ExecuteScale(conn, sql, ps);

            }

        }

        /// <summary>

        /// 该方法用于读取数据

        /// </summary>

        /// <param name="sql">sql语句</param>

        /// <param name="sp">sql参数</param>

        /// <returns>SqlDataReader类型</returns>

        public static SqlDataReader ExecuteReader(string sql, params SqlParameter[] sp)

        {

            SqlConnection conn = new SqlConnection(constr);

           using(SqlCommand cmd=new SqlCommand(sql,conn))

           {

            cmd.Parameters.AddRange(sp);

               try{

 

                conn.Open();

                return cmd.ExecuteReader(CommandBehavior.CloseConnection);

               }

               catch(Exception ex){

 

               conn.Close();

               conn.Dispose();

               throw ex;

                

               }

            

           }

        }

 

        /// <summary>

        /// 读取数据返回的是datatable

        /// </summary>

        /// <param name="sql"></param>

        /// <param name="ps"></param>

        /// <returns>DataTable</returns>

        public static DataTable ExecuteTable(string sql, params SqlParameter[] ps)

        {

            DataTable dt=new DataTable();

            using (SqlDataAdapter da = new SqlDataAdapter(sql, constr))

            {

                if (ps != null)

                {

                    da.SelectCommand.Parameters.AddRange(ps);

                }

                da.Fill(dt);

             

            }

            return dt;

        }

     

    }

}