sqlhelper-sql数据库

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

namespace dal
{
    public class sqlhelper
    {
        private SqlConnection conn = null;
        private SqlCommand cmd = null;
        private SqlDataReader sdr = null;
        private SqlDataAdapter sda = null;

        public sqlhelper()
        {
            string connstr = ConfigurationManager.ConnectionStrings

["connstr"].ConnectionString;
            conn = new SqlConnection(connstr);
        }

        private SqlConnection getconn()
        {
            if (conn.State == ConnectionState.Closed)
            {
                conn.Open();
            }
            return conn;
        }

        /// <summary>
        /// 执行不带参数的增删改sql语句或者存储过程
        /// </summary>
        /// <param name="cmdtext">sql语句或者存储过程</param>
        /// <param name="ct">命令类型</param>
        /// <returns></returns>

        //public int executenonquery(string cmdtext, CommandType ct)
        //{
        //    int res;
        //    try
        //    {
        //        cmd = new SqlCommand(cmdtext, getconn());
        //        cmd.CommandType = ct;
        //        res = cmd.ExecuteNonQuery();
        //    }
        //    catch (Exception ex)
        //    {
        //        throw ex;
        //    }
        //    finally
        //    {
        //        if (conn.State == ConnectionState.Open)
        //        {
        //            conn.Close();
        //        }
        //    }
        //    return res;
        //}

        /// <summary>
        /// 执行不带参数的增删改语句或者存储过程
        /// </summary>
        /// <param name="cmdtext">sql语句或者存储过程</param>
        /// <param name="ct">命令类型</param>
        /// <returns></returns>
        public int executenonquery(string cmdtext, CommandType ct)
        {
            int res;
            using (cmd = new SqlCommand(cmdtext, getconn()))
            {
                cmd.CommandType = ct;
                res = cmd.ExecuteNonQuery();
            }
            return res;
        }

        /// <summary>
        /// 执行带参数的增删改语句
        /// </summary>
        /// <param name="cmdtext">sql语句或者存储过程</param>
        /// <param name="paras">参数集合</param>
        /// <param name="ct">命令类型</param>
        /// <returns></returns>
        public int executenonquery(string cmdtext, SqlParameter[] paras,

CommandType ct)
        {
            int res;
            using (cmd = new SqlCommand(cmdtext, getconn()))
            {
                cmd.CommandType = ct;
                cmd.Parameters.AddRange(paras);
                res = cmd.ExecuteNonQuery();
            }
            return res;
        }

        /// <summary>
        /// 该方法执行传入的查询sql或者存储过程
        /// </summary>
        /// <param name="cmdtext">sql语句或者存储过程</param>
        /// <param name="ct">命令类型</param>
        /// <returns></returns>
        public DataTable executequery(string cmdtext, CommandType ct)
        {

            DataTable dt = new DataTable();
            cmd = new SqlCommand(cmdtext, getconn());
            cmd.CommandType = ct;
            using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
            {
                dt.Load(sdr);
            }
            return dt;
        }
        /// <summary>
        /// 执行带参数的SQL或者存储过程查询
        /// </summary>
        /// <param name="cmdtext">sql语句或者存储过程</param>
        /// <param name="paras">命令集合</param>
        /// <param name="ct">命令类型</param>
        /// <returns></returns>
        public DataTable executequery(string cmdtext, SqlParameter[] paras, CommandType ct)
        {

            DataTable dt = new DataTable();
            cmd = new SqlCommand(cmdtext, getconn());
            cmd.CommandType = ct;
            cmd.Parameters.AddRange(paras);
            using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
            {
                dt.Load(sdr);
            }
            return dt;
        }
        /// <summary>
        /// 不带参数sql或者存储过程查询过程
        /// </summary>
        /// <param name="cmdtext">sql语句或者存储过程名称</param>
        /// <param name="ct">命令的类型</param>
        /// <returns>返回一个dataset数据库</returns>
        public DataSet datasetquery(string cmdtext, CommandType ct)
        {
            DataSet ds = new DataSet();
            cmd = new SqlCommand(cmdtext, getconn());
            cmd.CommandType = ct;
            using (sda = new SqlDataAdapter(cmd))
            {
                sda.Fill(ds);
            }
            return ds;
        }
        /// <summary>
        /// 带参数sql或者存储过程查询过程
        /// </summary>
        /// <param name="cmdtext">sql语句或者存储过程名称</param>
        /// <param name="paras">参数</param>
        /// <param name="ct">命令的类型</param>
        /// <returns>返回dataset数据库</returns>
        public DataSet datasetquerypara(string cmdtext, SqlParameter[] paras, CommandType ct)
        {
            DataSet ds = new DataSet();
            cmd = new SqlCommand(cmdtext, getconn());
            cmd.CommandType = ct;
            cmd.Parameters.AddRange(paras);
            using (sda = new SqlDataAdapter(cmd))
            {
                sda.Fill(ds);
            }
            return ds;

        }

        /// <summary>
        /// 测试程序
        /// </summary>
        /// <param name="proc_name">存储过程名称</param>
        /// <returns></returns>
        public DataTable test(string proc_name)
        {
            DataTable dt = new DataTable();
            cmd = new SqlCommand(proc_name, getconn());
            cmd.CommandType = CommandType.StoredProcedure;
            using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
            {
                dt.Load(sdr);
            }
            return dt;
        }

    }
}

------------------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;

namespace dal
{
    public class newsdao
    {
        private sqlhelper sqlhelperex;
        public newsdao()
        {
            sqlhelperex = new sqlhelper();
        }

        /// <summary>
        /// 取出所有记录
        /// </summary>
        /// <returns></returns>
        public DataTable selectallnews()
        {
            return sqlhelperex.executequery("proc_select_allnews", CommandType.StoredProcedure);
        }

        //        /// <summary>
        //        ///取出最新10条新闻
        //        /// </summary>
        //        /// <returns></returns>
        //        public DataTable selectnewnews()
        //        {
        //            return sqlhelperex.executequery("proc_select_newnews",

        //CommandType.StoredProcedure);
        //        }
        //        /// <summary>
        //        /// 取出最新10调热点新闻
        //        /// </summary>
        //        /// <returns></returns>
        //        public DataTable selecttennewnews()
        //        {
        //            return sqlhelperex.executequery("proc_select_ten_news",

        //CommandType.StoredProcedure);
        //        }
        //        /// <summary>
        //        /// 根据新闻类别取出新闻
        //        /// </summary>
        //        /// <param name="caid">新闻类别</param>
        //        /// <returns></returns>
        //        public DataTable selectbycaid(string caid)
        //        {
        //            DataTable dt = new DataTable();
        //            SqlParameter[] paras = new SqlParameter[] {
        //            new SqlParameter("@caid",caid)          
        //            };
        //            dt = sqlhelperex.executequery("proc_select_bycaid", paras,

        //CommandType.StoredProcedure);
        //            return dt;
        //        }
        //        /// <summary>
        //        /// 根据新闻id取出新闻
        //        /// </summary>
        //        /// <param name="id">新闻id</param>
        //        /// <returns></returns>
        //        public DataTable selectbynewsid(string id)
        //        {

        //            DataTable dt = new DataTable();
        //            SqlParameter[] paras = new SqlParameter[] {
        //            new SqlParameter("@id",id)          
        //            };
        //            dt = sqlhelperex.executequery("proc_select_bynewsid", paras,

        //CommandType.StoredProcedure);
        //            return dt;
        //        }
        //        /// <summary>
        //        /// 根据新闻标题搜索新闻
        //        /// </summary>
        //        /// <param name="title">新闻标题</param>
        //        /// <returns></returns>
        //        public DataTable selectbytitle(string title)
        //        {

        //            DataTable dt = new DataTable();
        //            SqlParameter[] paras = new SqlParameter[] {
        //            new SqlParameter("@title",title)          
        //            };
        //            dt = sqlhelperex.executequery("proc_select_bynewstitle", paras,

        //CommandType.StoredProcedure);
        //            return dt;
        //        }

        /// <summary>
        /// 根据c1字段内容搜索
        /// </summary>
        /// <param name="c1">c1字段内容</param>
        /// <returns></returns>
        public DataTable selectbychar(string c1)
        {

            DataTable dt = new DataTable();
            SqlParameter[] paras = new SqlParameter[] {
                    new SqlParameter("@c1",c1)          
                    };
            dt = sqlhelperex.executequery("proc_select_bynewstitle", paras, CommandType.StoredProcedure);
            return dt;
        }

        //        /// <summary>
        //        /// 根据新闻内容搜索新闻
        //        /// </summary>
        //        /// <param name="content">新闻内容</param>
        //        /// <returns></returns>
        //        public DataTable selectbycontent(string content)
        //        {

        //            DataTable dt = new DataTable();
        //            SqlParameter[] paras = new SqlParameter[] {
        //            new SqlParameter("@content",content)          
        //            };
        //            dt = sqlhelperex.executequery("proc_select_bynewscontent", paras,

        //CommandType.StoredProcedure);
        //            return dt;
        //        }

        //        /// <summary>
        //        /// 增加新闻
        //        /// </summary>
        //        /// <param name="title">新闻标题</param>
        //        /// <param name="content">新闻内容</param>
        //        /// <param name="caid">新闻类别id</param>
        //        /// <returns></returns>
        //        public bool insertnews(string title, string content, string caid)
        //        {
        //            bool flag = false;
        //            SqlParameter[] paras = new SqlParameter[] {
        //            new SqlParameter("@title",title),
        //                new SqlParameter("@content",content),
        //                new SqlParameter("@caid",caid)
        //            };
        //            int res = sqlhelperex.executenonquery("proc_insert_news", paras,

        //CommandType.StoredProcedure);
        //            if (res > 0)
        //            {
        //                flag = true;
        //            }
        //            return flag;
        //        }

        /// <summary>
        /// 增加记录
        /// </summary>
        /// <param name="c1">字段1</param>
        /// <param name="c2">字段2</param>
        /// <returns>逻辑值</returns>
        public bool insertchar(string c1, string c2)
        {
            bool flag = false;
            SqlParameter[] paras = new SqlParameter[] {
                    new SqlParameter("@c1",c1),
                        new SqlParameter("@c2",c2)
                    };
            int res = sqlhelperex.executenonquery("proc_insert_news", paras, CommandType.StoredProcedure);
            if (res > 0)
            {
                flag = true;
            }
            return flag;
        }

        //        /// <summary>
        //        /// 修改新闻
        //        /// </summary>
        //        /// <param name="id">新闻id</param>
        //        /// <param name="title">新闻标题</param>
        //        /// <param name="content">新闻内容</param>
        //        /// <param name="caid">新闻类别id</param>
        //        /// <returns></returns>
        //        public bool updatenews(string id, string title, string content,

        //string caid)
        //        {
        //            bool flag = false;
        //            SqlParameter[] paras = new SqlParameter[] {
        //            new SqlParameter("@id",id),
        //            new SqlParameter("@title",title),
        //            new SqlParameter("@content",content),
        //            new SqlParameter("@caid",caid)
        //            };
        //            int res = sqlhelperex.executenonquery("porc_update_news", paras,

        //CommandType.StoredProcedure);
        //            if (res > 0)
        //            {
        //                flag = true;
        //            }
        //            return flag;

        //        }

        /// <summary>
        /// 更新记录
        /// </summary>
        /// <param name="id">id</param>
        /// <param name="c1">字段1</param>
        /// <param name="c2">字段2</param>
        /// <returns></returns>
        public bool updatechar(string id, string c1, string c2)
        {
            bool flag = false;
            SqlParameter[] paras = new SqlParameter[] {
                    new SqlParameter("@id",id),
                    new SqlParameter("@c1",c1),
                    new SqlParameter("@c2",c2)                  
                    };
            int res = sqlhelperex.executenonquery("proc_update_news", paras, CommandType.StoredProcedure);
            if (res > 0)
            {
                flag = true;
            }
            return flag;

        }

        //        /// <summary>
        //        /// 删除新闻
        //        /// </summary>
        //        /// <param name="id">新闻id</param>
        //        /// <returns></returns>
        //        public bool deletenews(string id)
        //        {
        //            bool flag = false;
        //            SqlParameter[] paras = new SqlParameter[] {            
        //                new SqlParameter("@id",id)
        //            };
        //            int res = sqlhelperex.executenonquery("proc_delete_news", paras,

        //CommandType.StoredProcedure);
        //            if (res > 0)
        //            {
        //                flag = true;
        //            }
        //            return flag;
        //        }

        /// <summary>
        /// 删除记录
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public bool deletechar(string id)
        {
            bool flag = false;
            SqlParameter[] paras = new SqlParameter[] {            
                        new SqlParameter("@id",id)
                    };
            int res = sqlhelperex.executenonquery("proc_delete_news", paras, CommandType.StoredProcedure);
            if (res > 0)
            {
                flag = true;
            }
            return flag;
        }
        /// <summary>
        /// 删除所有数据库中所有数据，请谨慎使用
        /// </summary>
        /// <returns></returns>
        public bool delecharall()
        {
            bool flag = false;
            int res = sqlhelperex.executenonquery("delete  donkey", CommandType.Text);
            if (res > 0)
            {
                flag = true;
            }
            return flag;
        }
        /// <summary>
        ///dataset 选择所有数据
        /// </summary>
        /// <returns>返回dataset数据表</returns>
        public DataSet selectallchar()
        {
            return sqlhelperex.datasetquery("select * from donkey", CommandType.Text);
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public DataSet selectbyid(string id)
        {
            SqlParameter[] paras = new SqlParameter[] {
            new SqlParameter("@id",id)
            };
            return sqlhelperex.datasetquerypara("select * from donkey where id=@id",paras,CommandType.Text);
        }

        /// <summary>
        /// 按照id选择数据
        /// </summary>
        /// <param name="id">id</param>
        /// <returns>返回一个数据表格</returns>
        public DataTable datasetselectbyid(string id)
        {
            DataTable dt = new DataTable();
            SqlParameter[] paras = new SqlParameter[]{
            new SqlParameter("@id",id)           
            };
            dt = sqlhelperex.executequery("proc_selectbyid", paras, CommandType.StoredProcedure);
            return dt;
        }

    }
}