C# DBHelper类 参考

using system;
using system.collections.generic;
using system.text;
using system.configuration;
using system.data;
using system.data.sqlclient;

namespace dal
{
    public class sqlhelper
    {

        //连接字符串
        static string strconn = configurationmanager.connectionstrings["cnnhorechargeplatformconnectionstring"].tostring();



        #region 执行查询，返回datatable对象-----------------------



        public static datatable gettable(string strsql)
        {
            return gettable(strsql, null);
        }
        public static datatable gettable(string strsql, sqlparameter[] pas)
        {
            return gettable(strsql, pas, commandtype.text);
        }
        /// <summary>
        /// 执行查询，返回datatable对象
        /// </summary>
        /// <param name="strsql">sql语句</param>
        /// <param name="pas">参数数组</param>
        /// <param name="cmdtype">command类型</param>
        /// <returns>datatable对象</returns>
        public static datatable gettable(string strsql, sqlparameter[] pas, commandtype cmdtype)
        {
            datatable dt = new datatable(); ;
            using (sqlconnection conn = new sqlconnection(strconn))
            {
                sqldataadapter da = new sqldataadapter(strsql, conn);
                da.selectcommand.commandtype = cmdtype;
                if (pas != null)
                {
                    da.selectcommand.parameters.addrange(pas);
                }
                da.fill(dt);
            }
            return dt;
        } 



        #endregion




        #region 执行查询，返回dataset对象-------------------------




        public static dataset getdataset(string strsql)
        {
            return getdataset(strsql,null);
        }

        public static dataset getdataset(string strsql, sqlparameter[] pas)
        { 
           return getdataset(strsql,pas,commandtype.text);
        }
        /// <summary>
        /// 执行查询，返回dataset对象
        /// </summary>
        /// <param name="strsql">sql语句</param>
        /// <param name="pas">参数数组</param>
        /// <param name="cmdtype">command类型</param>
        /// <returns>dataset对象</returns>
        public static dataset getdataset(string strsql, sqlparameter[] pas, commandtype cmdtype)
        {
            dataset dt = new dataset(); ;
            using (sqlconnection conn = new sqlconnection(strconn))
            {
                sqldataadapter da = new sqldataadapter(strsql, conn);
                da.selectcommand.commandtype = cmdtype;
                if (pas != null)
                {
                    da.selectcommand.parameters.addrange(pas);
                }
                da.fill(dt);
            }
            return dt;
        } 
        #endregion





        #region 执行非查询存储过程和sql语句-----------------------------




        public static int excuteproc(string procname)
        {
            return excutesql(procname, null, commandtype.storedprocedure);
        }

        public static int excuteproc(string procname, sqlparameter[] pars)
        {
            return excutesql(procname, pars, commandtype.storedprocedure);
        }

        public static int excutesql(string strsql)
        {
            return excutesql(strsql, null);
        }

        public static int excutesql(string strsql, sqlparameter[] paras)
        {
            return excutesql(strsql, paras, commandtype.text);
        }

        /// 执行非查询存储过程和sql语句
        /// 增、删、改
        /// </summary>
        /// <param name="strsql">要执行的sql语句</param>
        /// <param name="paras">参数列表，没有参数填入null</param>
        /// <param name="cmdtype">command类型</param>
        /// <returns>返回影响行数</returns>
        public static int excutesql(string strsql, sqlparameter[] paras, commandtype cmdtype)
        {
            int i = 0;
            using (sqlconnection conn = new sqlconnection(strconn))
            {
                sqlcommand cmd = new sqlcommand(strsql, conn);
                cmd.commandtype = cmdtype;
                if (paras != null)
                {
                    cmd.parameters.addrange(paras);
                }
                conn.open();
                i = cmd.executenonquery();
                conn.close();
            }
            return i;

        } 


        #endregion








        #region 执行查询返回第一行，第一列---------------------------------




        public static int excutescalarsql(string strsql)
        {
            return excutescalarsql(strsql, null);
        }

        public static int excutescalarsql(string strsql, sqlparameter[] paras)
        {
            return excutescalarsql(strsql, paras, commandtype.text);
        }
        public static int excutescalarproc(string strsql, sqlparameter[] paras)
        {
            return excutescalarsql(strsql, paras, commandtype.storedprocedure);
        }
        /// <summary>
        /// 执行sql语句，返回第一行，第一列
        /// </summary>
        /// <param name="strsql">要执行的sql语句</param>
        /// <param name="paras">参数列表，没有参数填入null</param>
        /// <returns>返回影响行数</returns>
        public static int excutescalarsql(string strsql, sqlparameter[] paras, commandtype cmdtype)
        {
            int i = 0;
            using (sqlconnection conn = new sqlconnection(strconn))
            {
                sqlcommand cmd = new sqlcommand(strsql, conn);
                cmd.commandtype = cmdtype;
                if (paras != null)
                {
                    cmd.parameters.addrange(paras);
                }
                conn.open();
                i =convert.toint32( cmd.executescalar());
                conn.close();
            }
            return i;

        }


        #endregion









        #region 查询获取单个值------------------------------------




        /// <summary>
        /// 调用不带参数的存储过程获取单个值
        /// </summary>
        /// <param name="procname"></param>
        /// <returns></returns>
        public static object getobjectbyproc(string procname)
        {
            return getobjectbyproc(procname, null);
        }
        /// <summary>
        /// 调用带参数的存储过程获取单个值
        /// </summary>
        /// <param name="procname"></param>
        /// <param name="paras"></param>
        /// <returns></returns>
        public static object getobjectbyproc(string procname, sqlparameter[] paras)
        {
            return getobject(procname, paras, commandtype.storedprocedure);
        }
        /// <summary>
        /// 根据sql语句获取单个值
        /// </summary>
        /// <param name="strsql"></param>
        /// <returns></returns>
        public static object getobject(string strsql)
        {
            return getobject(strsql,null);
        }
        /// <summary>
        /// 根据sql语句 和 参数数组获取单个值
        /// </summary>
        /// <param name="strsql"></param>
        /// <param name="paras"></param>
        /// <returns></returns>
        public static object getobject(string strsql, sqlparameter[] paras)
        {
            return getobject(strsql, paras, commandtype.text);
        }

        /// <summary>
        /// 执行sql语句，返回首行首列
        /// </summary>
        /// <param name="strsql">要执行的sql语句</param>
        /// <param name="paras">参数列表，没有参数填入null</param>
        /// <returns>返回的首行首列</returns>
        public static object getobject(string strsql, sqlparameter[] paras,commandtype cmdtype)
        {
            object o = null;
            using (sqlconnection conn = new sqlconnection(strconn))
            {
                sqlcommand cmd = new sqlcommand(strsql, conn);
                cmd.commandtype = cmdtype;
                if (paras != null)
                {
                    cmd.parameters.addrange(paras);

                }

                conn.open();
                o = cmd.executescalar();
                conn.close();
            }
            return o;

        }



        #endregion





        #region 查询获取datareader------------------------------------




        /// <summary>
        /// 调用不带参数的存储过程，返回datareader对象
        /// </summary>
        /// <param name="procname">存储过程名称</param>
        /// <returns>datareader对象</returns>
        public static sqldatareader getreaderbyproc(string procname)
        {
            return getreaderbyproc(procname, null);
        }
        /// <summary>
        /// 调用带有参数的存储过程，返回datareader对象
        /// </summary>
        /// <param name="procname">存储过程名</param>
        /// <param name="paras">参数数组</param>
        /// <returns>datareader对象</returns>
        public static sqldatareader getreaderbyproc(string procname, sqlparameter[] paras)
        {
            return getreader(procname, paras, commandtype.storedprocedure);
        }
        /// <summary>
        /// 根据sql语句返回datareader对象
        /// </summary>
        /// <param name="strsql">sql语句</param>
        /// <returns>datareader对象</returns>
        public static sqldatareader getreader(string strsql)
        {
            return getreader(strsql, null);
        }
        /// <summary>
        /// 根据sql语句和参数返回datareader对象
        /// </summary>
        /// <param name="strsql">sql语句</param>
        /// <param name="paras">参数数组</param>
        /// <returns>datareader对象</returns>
        public static sqldatareader getreader(string strsql, sqlparameter[] paras)
        {
           return getreader(strsql, paras, commandtype.text);
        }
        /// <summary>
        /// 查询sql语句获取datareader
        /// </summary>
        /// <param name="strsql">查询的sql语句</param>
        /// <param name="paras">参数列表，没有参数填入null</param>
        /// <returns>查询到的datareader（关闭该对象的时候，自动关闭连接）</returns>
        public static sqldatareader getreader(string strsql, sqlparameter[] paras,commandtype cmdtype)
        {
            sqldatareader sqldr = null;
            sqlconnection conn = new sqlconnection(strconn);
            sqlcommand cmd = new sqlcommand(strsql, conn);
            cmd.commandtype = cmdtype;
            if (paras != null)
            {
                cmd.parameters.addrange(paras);
            }
            conn.open();
            //commandbehavior.closeconnection的作用是如果关联的datareader对象关闭，则连接自动关闭
            sqldr = cmd.executereader(commandbehavior.closeconnection);            
            return sqldr;
        }



        #endregion




        #region 批量插入数据---------------------------------------------




        /// <summary>
        /// 往数据库中批量插入数据
        /// </summary>
        /// <param name="sourcedt">数据源表</param>
        /// <param name="targettable">服务器上目标表</param>
        public static void bulktodb(datatable sourcedt, string targettable)
        {
            sqlconnection conn = new sqlconnection(strconn);
            sqlbulkcopy bulkcopy = new sqlbulkcopy(conn);   //用其它源的数据有效批量加载sql server表中
            bulkcopy.destinationtablename = targettable;    //服务器上目标表的名称
            bulkcopy.batchsize = sourcedt.rows.count;   //每一批次中的行数

            try  
            {
                conn.open();
                if (sourcedt != null && sourcedt.rows.count != 0)
                    bulkcopy.writetoserver(sourcedt);   //将提供的数据源中的所有行复制到目标表中
            }   
            catch (exception ex)   
            {   
                throw ex;   
            }   
            finally  
            {
                conn.close();   
                if (bulkcopy != null)   
                    bulkcopy.close();   
            }   

        }

        #endregion


    }
}