Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

oracleÓësqlserverÖ´ÐÐcount(*)·µ»ØµÄ½á¹û¼æÈÝ

ÓÉÓÚÒÔǰ¶¼ÊÇÔÚsqlserver 2005´¦Àí£¬ÏÖÔÚ¿Í»§ÒªÇóoracleÊý¾Ý¿â·þÎñÆ÷£¬
×î³õµÄ´úÂëΪ£º
allRecordSize = (Integer) rs1.getObject(1);    //Integer allRecordSize=0;
µ±Ö´ÐеÄʱºò±¨£ºBigDecimalÎÞ·¨×ª»¯ÎªIntegerÀàÐÍ
ΪÁ˼æÈÝÁ½ÕßÐ޸ĺóµÄ´úÂëΪ£º
  Object o = rs1.getObject(1);
  System.out.println(o.getClass().getName());
  if(o.getClass().getName().equalsIgnoreCase("java.math.BigDecimal") ){
      ballRecordSize =(java.math.BigDecimal)o;
      allRecordSize = ballRecordSize.intValue();
  }else{
   allRecordSize = (Integer)o;
  }


Ïà¹ØÎĵµ£º

ÔÚOracleÏ¿ª·¢Java³ÌÐòµÄ¾­µäÎÊÌâ½â´ð

 
ÎÊÌâÒ»£ºÈç±£¼ÓÔØJDBCÇý¶¯³ÌÐò£º
 
Õý³£ÎÒÃǼÓÔØÇý¶¯³ÌÐòÓÐÈý¸ö;¾¶£º
 
1.Class.forName(String)ÕâÏëµ±ÓÚclassLoaderÒ»¸öStringÖ¸¶¨µÄÀ࣬ÔÚ×°ÔØÊ±°Ñ¸ÃÇý¶¯³ÌÐòµÄ¾²Ì¬ÄÚÈݶ¼³õʼ»¯£¬ÆäʵÕâʱÇý¶¯³ÌÐòÀàµ÷ÓÃÁËDriverManager.registerDriver(driver)·½·¨¡£
 
2.ʹÓÃϵͳÊôÐÔ£ºSystem.getPro ......

MYSQLºÍORACLEµÄһЩ²Ù×÷Çø±ð

ÓкܶàÓ¦ÓÃÏîÄ¿, ¸ÕÆð²½µÄʱºòÓÃMYSQLÊý¾Ý¿â»ù±¾ÉÏÄÜʵÏÖ¸÷ÖÖ¹¦ÄÜÐèÇó£¬Ëæ×ÅÓ¦ÓÃÓû§µÄÔö¶à£¬Êý¾ÝÁ¿µÄÔö¼Ó£¬MYSQL½¥½¥µØ³öÏÖ²»¿°ÖظºµÄÇé¿ö£º
Á¬½ÓºÜÂýÉõÖÁå´»ú£¬ÓÚÊǾÍÓаÑÊý¾Ý´ÓMYSQLǨµ½ORACLEµÄÐèÇó£¬Ó¦ÓóÌÐòÒ²ÒªÏàÓ¦×öһЩÐ޸ġ£±¾ÈË×ܽá³öÒÔϼ¸µã×¢ÒâÊÂÏϣÍû¶Ô´ó¼ÒÓÐËù°ïÖú¡£
1£® ×Ô¶¯Ôö³¤µÄÊý¾ÝÀàÐ ......

SqlserverÖÐCompute By×Ó¾äÓ÷¨·ÖÎö

SqlserverÖÐCompute By×Ó¾äÓ÷¨·ÖÎö
2007Äê04ÔÂ20ÈÕ ÐÇÆÚÎå 08:05
ʹÓÃCompute by×Ó¾äºÍÐÐͳ¼Æº¯Êý£¨count,sum,max,avg,minµÈ£©£¬¿ÉÒÔͳ¼ÆÅÅÐòÖнá¹ûÍêÈ«ÏàͬµÄÁУ¬Í³¼ÆÖµ×÷Ϊ²éѯ½á¹ûÒÔ¸½¼ÓÐеÄÐÎʽÏÔʾ£¬
Óï·¨£ºCompute avg|count|max|min|sum by ±í´ïʽ
1¡¢¾ÙÒ»¸öÀý×Ó
±ÈÈçÓÐÒ»¸öÊý¾Ý±í£º±íÃûΪperson,Èý¸ö×ֶηֱð ......

Ò»Ö»²éѯSQLServer 2005ËùÓÐÐÅÏ¢µÄÓï¾ä

select
    table_name=
    (
    case when t_c.column_id=1
        then t_o.name
        else ''
    end
    ),
    column_id=t_ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ