Oracle数据库链接（一）

没有使用ConnDBa辅助类package
two;

import
java.sql.Connection;

import
java.sql.DriverManager;

import
java.sql.ResultSet;

import
java.sql.SQLException;

import
java.sql.Statement;

public
class
SingleOracleJDBC {

public
static
void
main(String[] args) {

Connection conn=null
;

Statement sm=null
;

ResultSet rs=null
;

try
{

//1.注册驱动

Class.forName("oracle.jdbc.driver.OracleDriver"
);

//2.建立数据库链接 conn = DriverManager.getConnection(url, username, password);

conn=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl"
,"scott"
,"hello"
);

//3.创建JDBC Statement对象

sm=conn.createStatement();

//4.读取数据库

rs=sm.executeQuery("select * from dept"
);

while
(rs.next()){

System.out.println("deptno=="
+ rs.getInt(1));

System.out.println("dname=="
+ rs.getString(2));

System.out.println("loc=="
+ rs.getString(3));

}

} catch
(ClassNotFoundException e) {

e.printStackTrace();

} catch
(SQLException e) {

e.printStackTrace();

}finally
{

try
{

if
(rs!=null
){

rs.close();

}

if
(sm!=null
){

sm.close();

}

if
(conn!=null
){

conn.close();

}

} catch
(SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

}