.NETѧϰÊÖ¼ÇÖ®£ºlinq to SQL(Ò»)
Ò»¸ö¼òµ¥µÄÀý×Ó£º
ÏȽ¨Ò»¸öC#Àࣺ
ÒýÓÃSystem.Data.Linq.dll³ÌÐò¼¯£¬
using System.Data.Linq.MappingºÍ
using System.Data.Linq Á½¸ö¿Õ¼ä¡£
[Table]
public class Inventory
{
[Column]
public string Make;
[Column]
public string Color;
[Column]
public string PetName;
//Ö¸Ã÷Ö÷¼ü¡£
[Column(IsPrimaryKey = true)]
public int CarID;
public override string ToString()
{
return string.Format(
"±àºÅ={0};ÖÆÔìÉÌ={1};ÑÕÉ«={2};°®³Æ={3}",
CarID,Make.Trim(),Color.Trim(),PetName.Trim());
}
}
ÓëSQL(express°æ)Êý¾Ý¿â½»»¥:
class Program
{
const string cnStr=
@"Data Source=(local)\SQLEXPRESS;Initial Catalog=Autolot;"+
"Integrated Security=True";
static void Main(string[] args)
{
Console.WriteLine("*****LINQ to SQL ¼òµ¥Ó¦ÓÃ*****");
//´´½¨Ò»¸öDataContext¶ÔÏó¡£
DataContext db= new DataContext(cnStr);
//´´½¨Ò»¸öTable<>·ºÐÍʵÀý¡£
Table<Inventory> invTable = db.GetTable<Inventory>();
//ÓÃÒ»¸öLINQ²éѯÏÔʾ½á¹û¡£
foreach(var car in from c in invTable select c)
Console.WriteLine(car.ToString());
}
Console.ReadLine();
}
¶ÔDataContextÀà½øÐÐÀ©Õ¹£º
class MyAutoLotDatabase:DataContext
{
public Table<Inventory> Inventory;
public MyAut
Ïà¹ØÎĵµ£º
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[p_movefile]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[p_movefile]
GO
/*--ÒÆ¶¯·þÎñÆ÷ÉϵÄÎļþ
²»½èÖú xp_cmdshell ,ÒòΪÕâ¸öÔÚ´ó¶àÊýʱºò¶¼±»½ûÓÃÁË
--×Þ½¨ 2004.08(ÒýÓÃÇë±£Áô´ËÐÅÏ¢)--*/
/*--µ÷ÓÃʾÀý ......
4£®Êý¾ÝÀàÐÍת»»º¯Êý
¡ñÒþʽת»»
¸³ÖµÊ±¿É½øÐеÄÒþʽת»»ÓÐ
VARCHAR2»òCHAR —¡µNUMBER
VARCHAR2»òCHAR —¡µDATE
NUMBER —¡µVARCHAR ......
ÄãÊÇ·ñÔÚǧ·½°Ù¼ÆÓÅ»¯SQL Server Êý¾Ý¿âµÄÐÔÄÜ?Èç¹ûÄãµÄÊý¾Ý¿âÖк¬ÓдóÁ¿µÄ±í¸ñ£¬°ÑÕâЩ±í¸ñ·ÖÇø·ÅÈë¶ÀÁ¢µÄÎļþ×é¿ÉÄÜ»áÈÃÄãÊÜÒæ·Ëdz¡£SQL Server 2005ÒýÈëµÄ±í·ÖÇø¼¼Êõ£¬ÈÃÓû§Äܹ»°ÑÊý¾Ý·ÖÉ¢´æ·Åµ½²»Í¬µÄÎïÀí´ÅÅÌÖУ¬Ìá¸ßÕâЩ´ÅÅ̵IJ¢Ðд¦ÀíÐÔÄÜÒÔÓÅ»¯²éѯÐÔÄÜ¡£
¡¡¡¡SQL ServerÊý¾Ý¿â±í·ÖÇø²Ù×÷¹ý³ÌÓÉÈý¸ö²½Öè×é³É£º
¡ ......
¾¡Á¿ÉÙÓÃIN²Ù×÷·û£¬»ù±¾ÉÏËùÓеÄIN²Ù×÷·û¶¼¿ÉÒÔÓÃEXISTS´úÌæ¡£
²»ÓÃNOT IN²Ù×÷·û£¬¿ÉÒÔÓÃNOT EXISTS»òÕßÍâÁ¬½Ó+Ìæ´ú¡£
OracleÔÚÖ´ÐÐIN×Ó²éѯʱ£¬Ê×ÏÈÖ´ÐÐ×Ó²éѯ£¬½«²éѯ½á¹û·ÅÈëÁÙʱ±íÔÙÖ´ÐÐÖ÷²éѯ¡£¶øEXISTÔòÊÇÊ×Ïȼì²éÖ÷²éѯ£¬È»ºóÔËÐÐ×Ó²éѯֱµ½ÕÒµ½µÚÒ»¸öÆ¥ÅäÏî¡£NOT EXISTS±ÈNOT INЧÂÊÉԸߡ£µ«¾ßÌåÔÚÑ¡ÔñIN»òEXIST² ......
ÅжÏÊý¾Ý¿âÀàÐÍ
(select count(*) fromsysobjects)>0 //sqlÊý¾Ý¿â
(select count(*) from msysobjects)>0 //accessÊý¾Ý¿â
µÃµ½SqlÓû§Ãû
user>0
Conversion failed when converting the nvarchar value 'dbo' to data type int.
ÖØ¹¹SQLÓï¾ä
ÕûÊýÐÍ
(A) ID=49 ID=49 And [ ²éѯÌõ¼þ] £¬¼´Ê ......