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  1   :ÆÕͨSQLÓï¾ä¿ÉÒÔÓÃExecÖ´ÐÐ    
   
  eg:       Select   *   from   tableName    
                    Exec('select   *   from   tableName')    
                    Exec   sp_executesql   N'select   *   from   tableName'         --   Çë×¢Òâ×Ö·û´®Ç°Ò»¶¨Òª¼ÓN    
   
  2:×Ö¶ÎÃû£¬±íÃû£¬Êý¾Ý¿âÃûÖ®Àà×÷Ϊ±äÁ¿Ê±£¬±ØÐëÓö¯Ì¬SQL    
   
  eg:        
  declare   @fname   varchar(20)    
  set   @fname   =   'FiledName'    
  Select   @fname   from   tableName                             --   ´íÎó,²»»áÌáʾ´íÎ󣬵«½á¹ûΪ¹Ì¶¨ÖµFiledName,²¢·ÇËùÒª¡£    
  Exec('select   '   +   @fname   +   '   from   tableName')           --   Çë×¢Òâ   ¼ÓºÅÇ°ºóµÄ   µ¥ÒýºÅµÄ±ßÉϼӿոñ    
   
  µ±È»½«×Ö·û´®¸Ä³É±äÁ¿µÄÐÎʽҲ¿É    
  declare   @fname   varchar(20)    
  set   @fname   =   'FiledName'   --ÉèÖÃ×Ö¶ÎÃû    
   
  declare   @s   varchar(1000)    
  set   @s   =   'select   '   +   @fname   +   '   from   tableName'    
  Exec(@s)                                 --   ³É¹¦    
  exec   sp_executesql   @s       --   ´


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public class DBConn {
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