JAVA连接各种数据库
1、Oracle 数据库（thin模式）   

Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();    
String url="jdbc:oracle:thin:@localhost:1521:orcl";  //orcl为数据库的SID      
String user="test";    
String password="test";    
Connection conn= DriverManager.getConnection(url,user,password);  

 
2、MySQL数据库   

Class.forName("org.gjt.mm.mysql.Driver").newInstance();   
//myDB为数据库名
String url ="jdbc:mysql://localhost/myDB?user=soft&password=soft1234&useUnicode=true&characterEncoding=8859_1"  
Connection conn= DriverManager.getConnection(url);  

 
3、Sql Server7.0/2000数据库   

Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();    
String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=mydb"; //mydb为数据库  
String user="sa";  
String password="";  
Connection conn= DriverManager.getConnection(url,user,password);

 
4、Sybase数据库   

Class.forName("com.sybase.jdbc.SybDriver").newInstance();    
String url =" jdbc:sybase:Tds:localhost:5007/myDB"; //myDB为你的数据库名  
Properties sysProps = System.getProperties();  
SysProps.put("user","userid");    
SysProps.put("password","user_password");    
Connection conn= DriverManager.getConnection(url, SysProps); 

  
5、Informix数据库   

Class.forName("com.informix.jdbc.IfxDriver").newInstance();    
 //myDB为数据库名  
String url = "jdbc:informix-sqli://123.45.67.89:1533/myDB:INFORMIXSERVER=myserver;    
user=testuser;
password=testpassword"; 
Connection conn= DriverManager.getConnection(url); 

   
6、DB2数据库  

Class.forName("com.ibm.db2.jdbc.app.DB2Driver ").newInstance();    
String url="jdbc:db2://localhost:5000/sample";//sample为你的数据库名   
String user="admin";  
String password="";    
Connection conn= DriverManager.getConnection(url,user,password);  

7、PostgreSQL数据库  

Class.forName("org.postgresql.Driver").newInstance();  
//myDB为数据库名  
String url ="jdbc:postgresql://localhost/myDB"   
String user="myuser";   
String password="mypassword";    
Connection conn= DriverManager.getConnection(url,user,password);