JDBC连接oracle数据库代码

package com.muzi.unit;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DButil {

public Connection getconn() {

try {
Class.forName("oracle.jdbc.driver.OracleDriver");// 加载Oracle驱动程序
String url = "jdbc:oracle:thin:@localhost:1521:orcl";// localhost是本机地址，可更改为IP地址
String user = "muzi";// 用户名,系统默认的账户名
String password = "123465";// 你安装时选设置的密码
Connection conn = DriverManager.getConnection(url, user, password);// 获取连接

return conn;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

public void closeConn(Connection conn) {
try {
if (conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}

package com.muzi.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.muzi.unit.DButil;

public class UserDao {

public void getUserByUsername(String name) {
DButil util = new DButil();//new一个实例
Connection conn = util.getconn();
// sql?
String sql = "select * from users where u_name=?";//sql语句
try {
PreparedStatement pres = conn.prepareStatement(sql);//
pres.setString(1,"name");//参数
ResultSet res = pres.executeQuery();//获得结果集
while(res.next()) {
String id = res.getString("u_id");//u_id是数据库表列名
String username = res.getString("u_name");
String password = res.getString("u_pass");
System.out.println(id+username+password);//输出
}
} catch (SQLException e) {
e.printStackTrace();
}

}

}

package com.muzi.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import com.muzi.unit.DButil;

public class EditBrandDao {
public int editBrand() {
DButil util = new DButil();
Connection conn = util.getconn();
String sql = "update brand set b_name=?,b_phone=?,b_factory=? where b_id=?";
try {
PreparedStatement pres = conn.prepareStatement(sql);
pres.setString(1, "");
pres.setString(2, "");
pres.setString(3, "");
pres.setString(4, "");
int  res = pres.executeUpdate();
return res;

} catch (SQLException e) {
e.printStackTrace();
}
return 0;

}
}