»ù´¡ JAVA¶ÔMysql½øÐÐÁ¬½Ó¡¢²åÈë¡¢Ð޸ġ¢É¾³ý²Ù×÷
Êý¾Ý¿â±íµ¥µÄ´´½¨
mysql> create database shuishengmu;
Query OK, 1 row affected (0.00 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| shuishengmu |
| test |
+--------------------+
4 rows in set (0.00 sec)
mysql> use shuishengmu;
Database changed
mysql> create table user(
-> userid int(8) unsigned not null auto_increment,
-> username varchar(20) not null default'',
-> password varchar(40) not null default'',
-> email varchar(40) not null default'',
-> primary key(userid)
-> )
-> type=myisam;
Query OK, 0 rows affected, 1 warning (0.00 sec)
******************************************************************************
ÏÂÃæµÄÀàÊÇÁ¬½Ó¡¢²åÈë¡¢Ð޸ġ¢É¾³ý²Ù×÷
package shuishengmu;
import java.sql.*;
import java.util.logging.Level;
import java.util.logging.Logger;
public class ConnectDatabase {
String drivename="com.mysql.jdbc.Driver";
String url="jdbc:mysql://localhost/shuishengmu";
String user="root";
String password="111111";
String insql;
String upsql;
String delsql;
String sql="select * from user";
String name;
Connection conn;
ResultSet rs=null;
public Connection ConnectMysql(){
try{
&n
Ïà¹ØÎĵµ£º
ÔÚEclipseÖÐÁ¬ÉÏjavadocsÎĵµ
Ò»¡¢ °²×°Eclipse
¶þ¡¢ ´ÓOracle¹ÙÍø»òÕßsunÒÔǰµÄ¹ÙÍøÉÏÏÂÔØJavaÏàÓ¦µÄdocsÎĵµ
Èý¡¢ & ......
ÎÒÓõÄÊÇmysql5.0£¬
ÎÒ³ÌÐòÖÐÓõ½ÁËÒ»¾äsqlÊÇ
SQL code
select count(DISTINCT id) from Policyinfo p where p.filename not in
(select p2.filename from Policyreadinfo p2 where p2.reader='test')
µ«ÊÇÿ´ÎÔÚ³ÌÐòÖÐÿ´ÎÖ´ÐÐÕâ¾äsqlÊ±ÍøÒ³¾ÍÌØÂý£¬Òª10¶àÃ룬¶øÕâ2¸ö±íµÄ¼Ç¼ÐÐÊýÒ²¾Í1000¶à¶øÒÑ£¬ÎÒ°ÑÕâ¾äsqlµ¥¶ÀÄ ......
ÔÚmysqlÖÐÀûÓÃselectÓï¾äµÄÒ»¸öÌØÐԾͿÉÒԺܷ½±ãµØÊµÏÖ²éѯ½á¹ûµÄ·ÖÒ³£¬selectÓï¾äµÄÓï·¨£º
SELECT [STRAIGHT_JOIN] [SQL_SMALL_RESULT] [SQL_BIG_RESULT] [HIGH_PRIORITY]
[DISTINCT | DISTINCTROW | ALL]
select_expression,...
[INTO OUTFILE 'file_name'&nb ......
MySQLË÷Òýͨ³£ÊDZ»ÓÃÓÚÌá¸ßWHEREÌõ¼þµÄÊý¾ÝÐÐÆ¥Åä»òÕßÖ´ÐÐÁª½á²Ù×÷ʱƥÅäÆäËü±íµÄÊý¾ÝÐеÄËÑË÷ËÙ¶È¡£
MySQLÒ²ÄÜÀûÓÃË÷ÒýÀ´¿ìËÙµØÖ´ÐÐORDER BYºÍGROUP BYÓï¾äµÄÅÅÐòºÍ·Ö×é²Ù×÷¡£
ͨ¹ýË÷ÒýÓÅ»¯À´ÊµÏÖMySQLµÄORDER BYÓï¾äÓÅ»¯£º
1¡¢ORDER BYµÄË÷ÒýÓÅ»¯¡£Èç¹ûÒ»¸öSQLÓï¾äÐÎÈ磺
SELECT [column1],[column2],…. fro ......
ÔÚwindowsÏ£º
´ò¿ªÃüÁîÐд°¿Ú£¬Í£Ö¹mysql·þÎñ(»òÕßÔÚÈÎÎñ¹ÜÀíÆ÷Àï½áÊøµômysqld-nt.exe½ø³Ì)£º Net stop mysql
Æô¶¯mysql£¬Ò»°ãµ½mysqlµÄ°²×°Â·¾¶£¬ÕÒµ½ mysqld-nt.exe
Ö´ÐУºmysqld-nt --skip-grant-tables
ÁíÍâ´ò¿ªÒ»¸öÃüÁîÐд°¿Ú£¬Ö´ÐÐmysql
use mysql
update us ......