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

linq to sql Ïê

×î½üѧϰ linq to sql ¸Ð¾õ»¹ÊÇ¿ÉÒԵ쬷½±ã¿ì½Ý£¬ÒÔǰÎÊÊÇÒÔΪ²»ºÃÓ㬲»ÏëÓ㬵«ÊǽñÌìÓÃÁËһϸоõ»¹ÊDz»´íµÄ£¬ ȷʵÊǿ죬µ«ÊÇÎÒÓÖÔÚÏë
Èç¹û³ö´íÁËÔõô°ì£¬ÕâÑùÒ»¸öÀàÀï·ÅÄÇô¶àµÄÎļþÊÇÓе㲻ºÃ£¬ÔÙ˵ÁË linq to sql µÍ²ã²»ÖªµÀÔõôʵÏֵ쬻¹ÊÇûÓÐ×Ô¼ºÐ´µÄ·ÃÎʸоõÊæ·þµãºÇºÇ£¡£¡£¡
Èç¹ûÊÇ¿ìËÙ¿ª·¢Óàlinq to sql »¹ÊDz»´íµÄÑ¡Ôñ°¡£¡£¡£¡
-
»ù±¾µÄÔöɾ³ý¸Ä²é
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;
namespace WebServiceText
{
/// <summary>
/// Service1 µÄժҪ˵Ã÷
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ToolboxItem(false)]
// ÈôÒªÔÊÐíʹÓà ASP.NET AJAX ´Ó½Å±¾Öе÷ÓÃ´Ë Web ·þÎñ£¬ÇëÈ¡Ïû¶ÔÏÂÐеÄ×¢ÊÍ¡£
// [System.Web.Script.Services.ScriptService]
public class Service1 : System.Web.Services.WebService
{
DataClasses1DataContext context = new DataClasses1DataContext();
[WebMethod]
public List<Text> selectSwhere(int startid,int endid)
{
var result = (from text in context.Text
where text.id >= startid && text .id <=endid
select text).ToList<Text>();
return result;
}
[WebMethod]
public List<Text> selectAll()
{
return context.Text.ToList<Text>();
}
/// <summary>
/// Ìí¼ÓÒ»¸öÊý¾Ý
/// </summary>
/// <param name="sex">ÐÔ±ð</param>
/// <param name="age">ÄêÁä</param>
/// <returns>³É¹¦ÎªTrue·ñÔòΪFalse</returns>
[WebMethod]
public List<Text> addText(string sex, int age)
{
Te


Ïà¹ØÎĵµ£º

sql²éѯ±íÖÐ×ֶβ»Öظ´

·½·¨Ò»£º
 select distinct name from tablename
·½·¨¶þ£º
select min(fid),name,sex from tablename group by name
×ܼƣº
select distinct name from tablename ´ò¿ªÖظ´¼Ç¼µÄµ¥¸ö×Ö¶Î
select * from tablename where fid in(Select min(fid) from tablename group by name)´ò¿ªÖظ´¼Ç¼µÄËùÓÐ×Ö¶ÎÖµ
select ......

SQL ServerºÍOracleµÄ³£Óú¯Êý¶Ô±È

---------Êýѧº¯Êý
1.¾ø¶ÔÖµ
S:select abs(-1) value
O:select abs(-1) value from dual
2.È¡Õû(´ó)
S:select ceiling(-1.001) value
O:select ceil(-1.001) value from dual
3.È¡Õû£¨Ð¡£©
S:select floor(-1.001) value
O:select floor(-1.001) value from dual
4.È¡Õû£¨½ØÈ¡£©
S:select cast(-1.002 as int) v ......

DBA³£ÓÃsql(Ò»)

--¼à¿ØË÷ÒýÊÇ·ñʹÓà alter index &index_name monitoring usage; alter index &index_name nomonitoring usage; select * from v$object_usage where index_name = &index_name;
--ÇóÊý¾ÝÎļþµÄI/O·Ö²¼ select df.name,phyrds,phywrts,phyblkrd,phyblkwrt,singleblkrds,readtim,writetim from v$filestat fs,v ......

SQLÓïÑÔµÄCASEʹÓÃ×ܽá

 ×ª×Ôhttp://lavasoft.blog.51cto.com/62575/23373
SQLÓïÑÔµÄCASEÓï¾ä±¸Íü
 
¸ÅÊö£º
SQLÓï¾äÖеÄCASEÓï¾äÓë¸ß¼¶ÓïÑÔÖеÄswitchÓï¾ä£¬ÊDZê×¼SQLµÄÓï·¨£¬ÊÊÓÃÓëÒ»¸öÌõ¼þÅжÏÓжàÖÖÖµµÄÇé¿öÏ·ֱðÖ´Ðв»Í¬µÄ²Ù×÷¡£Áé»îÓ¦ÓÃCASEÓï¾ä¿ÉÒÔʹSQLÓï¾ä±äµÃ¼ò½àÒ×¶Á£¬ÏÂÃæÔÚDB2»·¾³ÏÂͨ¹ýÒ»¸ö¼òµ¥µÄ²éѯÀ´Õ¹Ê¾SQL CASEÓ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ