2ÖÖÁ¬½ÓÊý¾Ý¿âºÍ¶ÁÈ¡sqlÎļþÌí¼ÓÊý¾Ý¿âºÍ±í
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 ;
private Statement stmt ;
private ResultSet rs ;
/***
* Á¬½ÓMYSQLÊý¾Ý¿â
* @return
*/
public Connection getMySqlConn(){
try{
ADDRESS = "127.0.0.1";
PORT = 3306;
DBNAME = "test";
USERNAME = "root";
PASSWORD = "123456";
if(conn==null){
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://"+ADDRESS+":"+PORT+"?user="+USERNAME+"&password="+PASSWORD+"&useUnicode=true&characterEncoding=utf8");
}
}catch(Exception e){
e.printStackTrace();
}
return conn;
}
/***
* Á¬½ÓMSSQLÊý¾Ý¿â
* @return
*/
public Connection getMSSqlConn(){
try{
ADDRESS = "127.0.0.1";
PORT = 1433;
DBNAME = "mytest";
USERNAME = "sa";
PASSWORD = "";
if(conn==null){
Class.forName("net.sourceforge.jtds.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:jtds:sqlserver://"+ADDRESS+":"+PORT,USERNAME,PASSWORD);
}
}catch(Exception e){
e.printStackTrace();
}
return conn;
}
/**
* ¹Ø±ÕÊý¾Ý¿âÁ¬½Ó
* @return
*/
public void closeConn(){
try{
Ïà¹ØÎĵµ£º
²¿ÃŽṹ
Id name parentId
-----------------
1 ÈËʲ¿ 0
2
¿ª·¢²¿ 1
3 ·þÎñ²¿ 1
Óû§½á¹¹
Id name departId
--------------------
101
ÕÅÈý 2
102 ÀîËÄ 2
103 ÍõÎå 3
ÏëµÃµ½
ID name
parentId
-------------------
1 ÈËʲ¿ 0
2 ¿ª·¢²¿ 1
101
ÕÅ ......
ÔÚ¸ø¸÷ºÏ×÷ѧУ°²×°Ó¦ÓÃϵͳ¹ý³ÌÖУ¬·¢ÏÖѧУÀïµÄSQL SERVER 2000Êý¾Ý¿âËð»µÁË֨װºó¶¼·¢ÉúÁËͬÑùµÄÎÊÌ⣬ÄǾÍÊǰ²×°SQL SERVERÊý¾Ý¿â²»³É¹¦¡£ÔÒò£º¼´Ê¹Äãͨ¹ý¿ØÖÆÃæ°åÀïµÄ“Ìí¼Ó/ɾ³ý³ÌÐò” Õý³£µÄÐ¶ÔØSQL SERVERÊý¾Ý¿â£¬µ«ÊÇ£¬SQL SERVER»¹ÊÇûÓÐÍêÈ«Ð¶ÔØ¸É¾»£¬»¹ÐèÒªÊÖ¹¤½øÐÐһЩ²Ù×÷¡£Òò´ËÖØÐ°²×°²»³É¹¦£¬º ......
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 ......
SQL·ÖÒ³
ÍòÄÜ·ÖÒ³
.net´úÂë
select top ÿҳÏÔʾµÄ¼Ç¼Êý * from topic where id not in
(select top £¨µ±Ç°µÄÒ³Êý-1£©×ÿҳÏÔʾµÄ¼Ç¼Êý id from topic order by id desc)  ......