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
±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£©
......
SQL´¥·¢Æ÷ʵÀý½²½â
2008-10-31 21:06
SQL´¥·¢Æ÷ʵÀý1
¶¨Ò壺 ºÎΪ´¥·¢Æ÷£¿ÔÚSQL ServerÀïÃæÒ²¾ÍÊǶÔijһ¸ö±íµÄÒ»¶¨µÄ²Ù×÷£¬´¥·¢Ä³ÖÖÌõ¼þ£¬´Ó¶øÖ´ÐеÄÒ»¶Î³ÌÐò¡£´¥·¢Æ÷ÊÇÒ»¸öÌØÊâµÄ´æ´¢¹ý³Ì¡£
³£¼ûµÄ´¥·¢Æ÷ÓÐÈýÖÖ£º·Ö±ðÓ¦ÓÃÓÚInsert , Update , Delete ʼþ¡£
&nbs ......
¡¡¡¡º¯ÊýÊÇÒ»ÖÖÓÐÁã¸ö»ò¶à¸ö²ÎÊý²¢ÇÒÓÐÒ»¸ö·µ»ØÖµµÄ³ÌÐò¡£ÔÚSQLÖÐOracleÄÚ½¨ÁËһϵÁк¯Êý£¬ÕâЩº¯Êý¶¼¿É±»³ÆÎªSQL»òPL/SQLÓï¾ä£¬º¯ÊýÖ÷Òª·ÖΪÁ½´óÀࣺ
¡¡¡¡ µ¥Ðк¯Êý
¡¡¡¡ ×麯Êý
¡¡¡¡±¾ÎĽ«ÌÖÂÛÈçºÎÀûÓõ¥Ðк¯ÊýÒÔ¼°Ê¹ÓùæÔò¡£
¡¡¡¡SQLÖеĵ¥Ðк¯Êý
¡¡¡¡SQLºÍPL/SQLÖÐ×Ô´øºÜ¶àÀàÐ͵ĺ¯Êý£¬ÓÐ×Ö·û¡¢Êý×Ö¡¢ÈÕÆÚ¡ ......
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'
  ......
ÓÃSQLÓï¾äÌí¼Óɾ³ýÐÞ¸Ä×Ö¶Î
1.Ôö¼Ó×Ö¶Î
alter table docdsp add dspcode char(200)
alter table tbl add meet_group int2
2.ɾ³ý×Ö¶Î
ALTER TABLE table_NAME DROP COLUMN column_NAME
3.ÐÞ¸Ä×Ö¶ÎÀàÐÍ
&nbs ......