C# DBHelper類 參考

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

namespace DAL
{
    public class SQLHelper
    {
      
        //連接字符串
        static string strConn = ConfigurationManager.ConnectionStrings["CnnhoRechargePlatformConnectionString"].ToString();

       
        
        #region 執行查詢，返回DataTable對象-----------------------



        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>
        /// 執行查詢，返回DataTable對象
        /// </summary>
        /// <param name="strSQL">sql語句</param>
        /// <param name="pas">參數數組</param>
        /// <param name="cmdtype">Command類型</param>
        /// <returns>DataTable對象</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 執行查詢，返回DataSet對象-------------------------




        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>
        /// 執行查詢，返回DataSet對象
        /// </summary>
        /// <param name="strSQL">sql語句</param>
        /// <param name="pas">參數數組</param>
        /// <param name="cmdtype">Command類型</param>
        /// <returns>DataSet對象</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 執行非查詢存儲過程和SQL語句-----------------------------




        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);
        }

        /// 執行非查詢存儲過程和SQL語句
        /// 增、刪、改
        /// </summary>
        /// <param name="strSQL">要執行的SQL語句</param>
        /// <param name="paras">參數列表，沒有參數填入null</param>
        /// <param name="cmdType">Command類型</param>
        /// <returns>返回影響行數</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 執行查詢返回第一行，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>
        /// 執行SQL語句，返回第一行，第一列
        /// </summary>
        /// <param name="strSQL">要執行的SQL語句</param>
        /// <param name="paras">參數列表，沒有參數填入null</param>
        /// <returns>返回影響行數</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 查詢獲取單個值------------------------------------




        /// <summary>
        /// 調用不帶參數的存儲過程獲取單個值
        /// </summary>
        /// <param name="ProcName"></param>
        /// <returns></returns>
        public static object GetObjectByProc(string ProcName)
        {
            return GetObjectByProc(ProcName, null);
        }
        /// <summary>
        /// 調用帶參數的存儲過程獲取單個值
        /// </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>
        /// 根據sql語句獲取單個值
        /// </summary>
        /// <param name="strSQL"></param>
        /// <returns></returns>
        public static object GetObject(string strSQL)
        {
            return GetObject(strSQL,null);
        }
        /// <summary>
        /// 根據sql語句 和 參數數組獲取單個值
        /// </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>
        /// 執行SQL語句，返回首行首列
        /// </summary>
        /// <param name="strSQL">要執行的SQL語句</param>
        /// <param name="paras">參數列表，沒有參數填入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 查詢獲取DataReader------------------------------------




        /// <summary>
        /// 調用不帶參數的存儲過程，返回DataReader對象
        /// </summary>
        /// <param name="procName">存儲過程名稱</param>
        /// <returns>DataReader對象</returns>
        public static SqlDataReader GetReaderByProc(string procName)
        {
            return GetReaderByProc(procName, null);
        }
        /// <summary>
        /// 調用帶有參數的存儲過程，返回DataReader對象
        /// </summary>
        /// <param name="procName">存儲過程名</param>
        /// <param name="paras">參數數組</param>
        /// <returns>DataReader對象</returns>
        public static SqlDataReader GetReaderByProc(string procName, SqlParameter[] paras)
        {
            return GetReader(procName, paras, CommandType.StoredProcedure);
        }
        /// <summary>
        /// 根據sql語句返回DataReader對象
        /// </summary>
        /// <param name="strSQL">sql語句</param>
        /// <returns>DataReader對象</returns>
        public static SqlDataReader GetReader(string strSQL)
        {
            return GetReader(strSQL, null);
        }
        /// <summary>
        /// 根據sql語句和參數返回DataReader對象
        /// </summary>
        /// <param name="strSQL">sql語句</param>
        /// <param name="paras">參數數組</param>
        /// <returns>DataReader對象</returns>
        public static SqlDataReader GetReader(string strSQL, SqlParameter[] paras)
        {
           return GetReader(strSQL, paras, CommandType.Text);
        }
        /// <summary>
        /// 查詢SQL語句獲取DataReader
        /// </summary>
        /// <param name="strSQL">查詢的SQL語句</param>
        /// <param name="paras">參數列表，沒有參數填入null</param>
        /// <returns>查詢到的DataReader（關閉該對象的時候，自動關閉連接）</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的作用是如果關聯的DataReader對象關閉，則連接自動關閉
            sqldr = cmd.ExecuteReader(CommandBehavior.CloseConnection);            
            return sqldr;
        }



        #endregion




        #region 批量插入數據---------------------------------------------




        /// <summary>
        /// 往數據庫中批量插入數據
        /// </summary>
        /// <param name="sourceDt">數據源表</param>
        /// <param name="targetTable">服務器上目標表</param>
        public static void BulkToDB(DataTable sourceDt, string targetTable)
        {
            SqlConnection conn = new SqlConnection(strConn);
            SqlBulkCopy bulkCopy = new SqlBulkCopy(conn);   //用其它源的數據有效批量加載sql server表中
            bulkCopy.DestinationTableName = targetTable;    //服務器上目標表的名稱
            bulkCopy.BatchSize = sourceDt.Rows.Count;   //每一批次中的行數
  
            try  
            {
                conn.Open();
                if (sourceDt != null && sourceDt.Rows.Count != 0)
                    bulkCopy.WriteToServer(sourceDt);   //將提供的數據源中的所有行復制到目標表中
            }   
            catch (Exception ex)   
            {   
                throw ex;   
            }   
            finally  
            {
                conn.Close();   
                if (bulkCopy != null)   
                    bulkCopy.Close();   
            }   
        
        }

        #endregion


    }
}