การรับข้อมูลที่ส่งมาจากฟอร์ม Form นั้น มีวิธีการส่งอยู่ 2 แบบนั่นคือ แบบ GET กับแบบ POST แต่เป็นวิธีการส่งข้อมูลให้กับ server ทั้งคู่ดังนั้นเมื่อเริ่มศึกษาการเขียนเว็บไซต์คนส่วนใหญ่จะสับสนถึงความแตกต่างในการใช้งานระหว่าง GET และ POST ว่าควรใช้งานในลักษณะใดซึ่งสามารถสรุปได้สั้นๆ ดังนี้
นอกจากนี้ยังมีรายละเอียดปลีกย่อยต่างๆเพิ่มเติมที่จะกล่าวถึงต่อไปดังนี้
This article explains how to install PHP 8 and Apache 2.4 on Windows 10 (64-bit).
Linux and macOS users often have Apache and PHP pre-installed or available via package managers. Windows 10 requires a little more effort. The steps below may work with other editions of Windows, PHP, and Apache, but check the documentation of each dependency for specific instructions.
A handy feature often used on Windows computers is creating shortcuts. Shortcuts are handy ways to link to items such as folders, files, apps, and more. To better understand shortcuts, look at our Understanding Shortcuts article.
When you create a shortcut Windows creates an icon that looks similar to the item your shortcut links to and will have two additional identifiers—a curved arrow icon in the lower-left corner of the icon and the text “- Shortcut” added at the end of the shortcut’s name. If you find that you typically rename your shortcut by removing the “- Shortcut” text or you would prefer to change the appended text, you can do so using the Registry Editor within Windows 10. In two other tips, we have covered how to modify the default name for new folders and how to change the name of copied folders. If you followed those two articles much of what you do in this tip will be familiar.
There are three ways to check MySQL database and table sizes:
1. Using phpMyAdmin.
2. Using the SELECT statement.
3. Using MySQL workbench.
All methods provide ways to check the size for:
Choose a method that best fits your configuration and follow the step-by-step instructions below.
Step 1. Press Windows+R simultaneously, and then a new window is opened. Type “regedit” in the blank, and click the button of OK.
Step 2. Navigate to the following location: HKEY_CURRENT_USER> Control Panel> Desktop> WindowMetrics
วันนี้จะมาเขียนข้อมูลเกี่ยวกับ sql ที่ได้เขียนมา โจทย์ก็ตามหัวข้อเลยครับ คือให้ดึงข้อมูลจากตาราง 7 วันล่าสุด และถ้าวันไหนไม่มีข้อมูลให้โชว์ Value เป็น 0
คือปกติเวลาคิวรี่ข้อมูล มันจะแสดงข้อมูลเฉพาะที่มีขึ้นมาแสดงใช่ไหมครับ เช่น สมมุติข้อมูลมี ดังภาพด้านล่าง
เวลาเราคิวรี่ข้อมูล 7 วันล่าสุด ก็จะใช้โค้ดประมาณนี้
SELECT * FROM challenge_table WHERE challenge_date BETWEEN DATE_SUB(NOW(), INTERVAL 7 DAY) AND NOW()
Once you have installed the Arduino IDE, open it up and click on preferences.
We will need to add the ESP board manager URL. Enter the following into the additional board manager URLs text box.
https://arduino.esp8266.com/stable/package_esp8266com_index.json
If you need to use multiple board managers, you can click the small icon to the right of the text box and enter multiple URLs.
RS232 Connector Pin Assignment
RS232 Cable Information
DB 9 and DB 25 Connection
The original pin layout for RS232 was developed for a 25 pins D sub connector. In this pin-out provisions were made for a secondary communication channel. In practice, only one communication channel with accompanying handshaking is present. For that reason the smaller 9 pin version is more commonly used today.
The diagrams show the signals common to both connector types in black. The signals only present on the larger connector are shown in red.
Note: The protective ground is assigned to a pin at the large connector, in DB9 version protective ground connector to encloser.
For the DEC modified modular jack. Although is differential (the receive and transmit have their own floating ground level) still possible to connect RS232 compatible devices with this interface.
This article is a guide for the ESP8266 GPIOs: pinout diagrams, their functions and how to use them.
The ESP8266 12-E chip comes with 17 GPIO pins. Not all GPIOs are exposed in all ESP8266 development boards, some GPIOs are not recommended to use, and others have very specific functions.
With this guide, you’ll learn how to properly use the ESP8266 GPIOs and avoid hours of frustration by using the most suitable pins for your projects.
We also have a guide for the ESP32 GPIOs: ESP32 Pinout Reference: Which GPIO pins should you use?
