這節課開始我們開始講封裝jdbc

  分析:

在前面幾課中，我們都要先建立連線，獲取Connection物件，而且程式碼是重複的，我們可以將這部分程式碼提取出來

  實現:

package com.tool;



import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;



//Database Connection，負責連線資料庫，返回一個Connection物件

public class 
 
Dbc {



    //不允許呼叫構造器

    private Dbc(){}



    public static Connection getConnection(String driver,String url,String user, String password) throws ClassNotFoundException, SQLException {

        Class.forName(driver)
 
;

        return DriverManager.getConnection(url,user,password);

    }

}

  測試程式碼:

public static void main(String[] args) throws SQLException, ClassNotFoundException {

    String driver = "com.mysql.jdbc.Driver";

    
 
String url = "jdbc:mysql://localhost:3306/teach";

    String user = "root";

    String password = "root";

    Connection conn = Dbc.getConnection(driver, url, user, password);



    //測試下連線是否真的可用

    Statement statement = conn.createStatement();

    String sql = "select * from tbl_employee where id = 1";

    ResultSet resultSet = statement.executeQuery(sql);

    resultSet.next();

    System.out.println(resultSet.getInt(1));

    System.out.println(resultSet.getString(2));

    //連線確實可用

}

  結果:

1

xiaoye