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
create PROCEDURE pagelist
@tablename nvarchar(50),
@fieldname nvarchar(50)='*',
@pagesize int output,--ÿҳÏÔʾ¼Ç¼ÌõÊý
@currentpage int output,--µÚ¼¸Ò³
@orderid nvarchar(50),--Ö÷¼üÅÅÐò
@sort int,--ÅÅÐò·½Ê½£¬1±íʾÉýÐò£¬0±íʾ½µÐòÅÅÁÐ
......
SQL½ØÈ¡×Ö·û´®
SUBSTRING
·µ»Ø×Ö·û¡¢binary¡¢text »ò image ±í´ïʽµÄÒ»²¿·Ö¡£ÓйؿÉÓë¸Ãº¯ÊýÒ»ÆðʹÓõÄÓÐЧMicrosoft SQL Server Êý¾ÝÀàÐ͵ĸü¶àÐÅÏ¢£¬Çë²Î¼ûÊý¾ÝÀàÐÍ¡£
Óï·¨
SUBSTRING ( expression & ......
Sample1:
/* Variable Declaration */
DECLARE @EmpID AS SMALLINT
DECLARE @SQLQuery AS NVARCHAR(500)
/* Build and Execute a Transact-SQL String with a single parameter value Using EXECUTE Command */
SET @EmpID = 1001
SET @SQLQuery = 'SELECT * from tblEmployees WHERE EmployeeID = ' + CAST(@EmpID A ......
¡¡¡¡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¡ ......
ÏÂÃæµÄÕâЩ½Å±¾¶¼¿ÉÒÔÕÒµ½ÒýÆð´ÅÅÌÅÅÐòµÄSQL¡£
SELECT /*+ rule */ DISTINCT a.SID, a.process, a.serial#,
TO_CHAR (a.logon_time, 'YYYYMMDD HH24:MI:SS') LOGON, a.osuser,TABLESPACE, b.sql_text
from v$session a, v$sql b, v$sort_usage c
WHERE a.sql_address = b.address AND a.saddr = c.session_addr;
......