??????????
????JDBC??URL??Э????????Э???????????????
????Э????????“jdbc”?? ??Э??????JDBC??????????д??????? ???????????????????????????????Щ????????????? Oracle??URL ???? ??????oracle.jdbc.driver.OracleDriver URL??jdbc:oracle:thin:@machine_name:port:dbname ?1??machine_name?????????????????????? ?2??port????????????1521 ???
????Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
????String url="jdbc:oracle:thin:@localhost:1521:orcl"; //orcl???????SID
????String user="test";
????String password="test";
????Connection conn= DriverManager.getConnection(url??user??password);
????Mysql??URL ???? ??????com.MySQL.jdbc.Driver URL??jdbc:mysql://machine_name:port/dbname ?1??machine_name?????????????????????? ?2??port??????????3306 ???
????Class.forName("com.mysql.jdbc.Driver").newInstance();
????String url ="jdbc:mysql://localhost/myDB?
????user=soft&password=soft1234&useUnicode=true&characterEncoding=8859_1"
????//myDB????????
????Connection conn= DriverManager.getConnection(url);
????SQL Server??URL ???? ??????com.microsoft.sqlserver.jdbc.SQLServerDriver URL??jdbc:sqlserver://machine_name:port;databaseName= ?1??machine_name?????????????????????? ?2??port????????????1433 ?3??databaseName????Сд??????databasename????DatabaseName????????? ???
????Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();
????String url="jdbc:sqlserver://localhost:1433;databaseName=mydb";
????//mydb??????
????String user="sa";
????String password="";
????Connection conn= DriverManager.getConnection(url??user??password);