¶¯Ì¬sqlÓï¾ä»ù±¾Óï·¨
¶¯Ì¬sqlÓï¾ä»ù±¾Óï·¨
1 :ÆÕͨSQLÓï¾ä¿ÉÒÔÓÃExecÖ´ÐÐ
eg: Select * from tableName
Exec('select * from tableName')
Exec sp_executesql N'select * from tableName' -- Çë×¢Òâ×Ö·û´®Ç°Ò»¶¨Òª¼ÓN
2:×Ö¶ÎÃû£¬±íÃû£¬Êý¾Ý¿âÃûÖ®Àà×÷Ϊ±äÁ¿Ê±£¬±ØÐëÓö¯Ì¬SQL
eg:
declare @fname varchar(20)
set @fname = 'FiledName'
Select @fname from tableName -- ´íÎó,²»»áÌáʾ´íÎ󣬵«½á¹ûΪ¹Ì¶¨ÖµFiledName,²¢·ÇËùÒª¡£
Exec('select ' + @fname + ' from tableName') -- Çë×¢Òâ ¼ÓºÅǰºóµÄ µ¥ÒýºÅµÄ±ßÉϼӿոñ
µ±È»½«×Ö·û´®¸Ä³É±äÁ¿µÄÐÎʽҲ¿É
declare @fname varchar(20)
set @fname = 'FiledName' --ÉèÖÃ×Ö¶ÎÃû
declare @s varchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s) -- ³É¹¦
exec sp_executesql @s -- ´
Ïà¹ØÎĵµ£º
-->Ŀ¼
-->SQL Server ¹¹¼Ü
-->ʵʩϸÔò
-->×î´óÈÝÁ¿ËµÃ÷
×î´óÖµ£¨ÊýÁ¿»ò´óС£©
¶ÔÏó SQL Server 7.0 SQL Server 2000
Åú´¦Àí´óС 65,536 * ÍøÂçÊý¾Ý°ü´óС1 65,536 * ÍøÂçÊý¾Ý°ü´óС1
ÿ¸ö¶Ì×Ö·û´®ÁеÄ×Ö½ÚÊý 8,000 8,000
ÿ¸ö text¡¢ntext¡¢»ò image ÁеÄ×Ö½ÚÊý 2 GB£2 2 GB£2
ÿ¸ö GROU ......
£Ó£Ñ£Ì×¢ÈëÊÇ´ÓÕý³£µÄWWW¶Ë¿Ú·ÃÎÊ£¬¶øÇÒ±íÃæ¿´ÆðÀ´¸úÒ»°ãµÄWebÒ³Ãæ·ÃÎÊÃ»Ê²Ã´Çø±ð£¬ ËùÒÔĿǰÊÐÃæµÄ·À»ðǽ¶¼²»»á¶Ô£Ó£Ñ£Ì×¢Èë·¢³ö¾¯±¨£¬Èç¹û¹ÜÀíԱû²é¿´IISÈÕÖ¾µÄϰ¹ß£¬¿ÉÄܱ»ÈëÇֺܳ¤Ê±¼ä¶¼²»»á·¢¾õ¡£
Ëæ×ÅB/SģʽӦÓÿª·¢µÄ·¢Õ¹£¬Ê¹ÓÃÕâÖÖģʽ±àдӦÓóÌÐòµÄ³ÌÐòÔ±Ò²Ô½À´Ô½¶à¡£µ«ÊÇÓÉÓÚÕâ¸öÐÐÒµµÄÈëÃÅÃż÷²»¸ß£¬³ÌÐòÔ±µ ......
¹úÍâ¿Õ¼äÃ²ËÆ¶ÔÖÐÎıȽϸÐð Èç¹ûÊý¾ÝÀàÐÍÉè¼ÆÎª varchar ÀàÐ͵ϰ ´æ´¢µÄÊý¾Ý»ù±¾ÉÏÊÇ "£¿£¿£¿£¿"
ºÜ¼òµ¥ ½« varchar ÀàÐÍ Éè¼ÆÎª nvarchar ÀàÐÍ
create table cs
(
txt1 nvarchar(50) null
)
insert into cs (txt1 ) values ('²âÊÔ') -- Èë¿âʱÊý¾Ýʱ £¿£¿£¿£¿
insert into cs (txt ......
string s = " 80,81,83,82";
string[] s1 = s.Split(',');
int[] p = new int[s1.Count()];
for (int i = 0; i < s1.Count( ......
import java.io.*;
import java.sql.*;
public class DBConn {
private String ADDRESS ;
private int PORT ;
private String DBNAME ;
private String USERNAME ;
private String PASSWORD ;
private Connection conn ;
private PreparedStatement pstmt ;
pri ......