【276天】每日項目總結系列014（2017.11.08）

叨叨兩句

1. ~

JDBC的使用步驟

1.註冊驅動
2.得到鏈接
3.建立執行SQL語句的對象
4.執行SQL語句
5.關閉資源

public static void main(String[] args) throws SQLException {
        //註冊驅動
        DriverManager.registerDriver(new Driver());
        String url = "jdbc:mysql://localhost:3306/day10";
        String user = "root";
        String password = "123456";
        //得到鏈接
        Connection connection = DriverManager.getConnection(url, user, password);
        //建立執行sql語句對象
        Statement statement = connection.createStatement();
        //執行sql,處理結果
        String sql = "select *from user";
        ResultSet resultSet = statement.executeQuery(sql);
        while (resultSet.next()) {
            System.out.println(resultSet.getObject(1));
            System.out.println(resultSet.getObject(2));
            System.out.println(resultSet.getObject(3));
            System.out.println(resultSet.getObject(4));
            
        }
        //關閉資源
        if(resultSet != null){
            resultSet.close();
            
        }
        
        if(statement  != null){
            statement .close();
        }
        
        if(connection != null){
            connection.close();
        }
        

    }