Java面試題 寫一個比較完美的JDBC 鏈接數據庫的程序

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

 

public class JDBCTest {

 

public static void main(String[] args) {

Connection conn = null;

Statement stmt = null;

ResultSet rs = null;

try {

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

conn = DriverManager

.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL",

"ccug", "ccug1234");

stmt = conn.createStatement();

rs = stmt.executeQuery("select * from usr");

while (rs.next()) {

System.out.println(rs.getString("username"));

rs.getString("password");

}

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (SQLException e) {

e.printStackTrace();

} finally {

try {

if (rs != null) {

rs.close();

rs = null;

}

if (stmt != null) {

stmt.close();

stmt = null;

}

if (conn != null) {

conn.close();

conn = null;

}

 

} catch (SQLException e) { 

e.printStackTrace();

}

}

 

}

}

 

面試題中若是有JDBC 鏈接數據庫的題 你這麼寫就比較完美了 最好加上註釋！！！