¾¡Á¿²»ÒªÆ´´ÕSqlÓï¾ä,ÓòÎÊýÀ´·À×¢Èë
Èç¹ûÊÇÀàËÆ"select * from user where uid="+uid +" and pwd="+pwd ºÜÈÝÒ׳öÎÊÌâ
ʹÓà SQLParamenter
°ÑÄãµÄSQLÓï¾äд³É ÀàËÆ´æ´¢¹ý³Ì
select * from user where uid=@uid and pwd=@pwd
ʹÓÃÕâ¸öSQLÓï¾ä¶¨ÒåΪ SQLCommand ¶ÔÏó È»ºóʹÓà Paramenter ¶ÔÏó°Ñ @*** Ìæ»»Îª Öµ
¾Í¿ÉÒԸ㶨עÈëʽ©¶´ÁË
Ïà¹ØÎĵµ£º
ÊìϤSQL SERVER 2000µÄÊý¾Ý¿â¹ÜÀíÔ±¶¼ÖªµÀ£¬ÆäDTS¿ÉÒÔ½øÐÐÊý¾ÝµÄµ¼Èëµ¼³ö£¬Æäʵ£¬ÎÒÃÇÒ²¿ÉÒÔʹÓÃTransact-SQLÓï¾ä½øÐе¼Èëµ¼³ö²Ù×÷¡£ÔÚTransact-SQLÓï¾äÖУ¬ÎÒÃÇÖ÷ҪʹÓÃOpenDataSourceº¯Êý¡¢OPENROWSET º¯Êý£¬¹ØÓÚº¯ÊýµÄÏêϸ˵Ã÷£¬Çë²Î¿¼SQLÁª»ú°ïÖú¡£ÀûÓÃÏÂÊö·½·¨£¬¿ÉÒÔÊ®·ÖÈÝÒ×µØÊµÏÖSQL SERVER¡¢ACCESS¡¢EXCELÊý¾Ýת»»£ ......
±êÇ©£ºÊý¾Ý·ÃÎÊ ADO.NET
DataAdapter ¶ÔÏóÖеÄSQLÃüÁî ×¢£ºADO.NET¶ÔÏóÄ£ÐÍ ºÍ C# Òª±È SQL ¸üÊʺϴ¦Àí¸´ÔÓÔËËã ºÍ µ¼º½Âß¼£¨±ÈÈ磬²éÕÒÏà¹ØµÄÁíÒ»¸ö±íµÄÊý¾Ý£©
......
Êý¾Ý¿â²Ù×÷£ºÀûÓú¯Êý¼õÉÙ´æ´¢¿Õ¼ä£¨ÒÔʱ¼ä»»È¡¿Õ¼ä£©
ÀýÈçÒ»¸ö±íÓÐIPÁУ¬ÔÚ´æ´¢µÄʱºòÎÒÃÇΪÁ˼õÉÙ´æ´¢¿Õ¼ä£¬¿ÉÒÔ½«Ëüת»¯ÎªÕûÊý£¬´æ´¢ÔÚÊý¾Ý¿â£¬µ«ÊÇÔÚ´ÓÊý¾Ý¿âÀï²éѯ²¢ÏÔʾ¸ø´ó¼Ò¿´µÄʱºò£¬¿ÉÄÜÄãÊÇ¿´²»Ã÷°×ÕûÊý¾ßÌåÊÇʲô¡£ÕâÑùΪÁËÀûÓÚ´ó¼ÒÔĶÁ·ÖÎöÊý¾Ý£¬¿ÉÒÔÔÚ²éѯµÄʱºòÀûÓú¯Êý½«ÕûÊýIPתΪΪ×Ö·û´®
ÀýÈ磺
&nbs ......
Case¾ßÓÐÁ½ÖÖ¸ñʽ¡£¼òµ¥Caseº¯ÊýºÍCaseËÑË÷º¯Êý¡£
--¼òµ¥Caseº¯Êý
CASE sex
WHEN '1' THEN 'ÄÐ'
WHEN '2' THEN 'Å®'
ELSE 'ÆäËû' END
--CaseËÑË÷º¯Êý
CASE WHEN sex = '1' THEN 'ÄÐ'
  ......