PHP/MySQL Three-Day Pass - Day Two (Two)_PHP Tutorial
四、 向服务器发送数据
现在我们从数据库读取数据已经没有太多困难了。但是怎么反过来向数据库发送数据呢?其实这不是PHP的问题。
首选,我们创建一个带有简单表格的网页。
$#@60;html$#@62; $#@60;body$#@62; $#@60;form method="post" action="$#@60;?php echo $PATH_INFO?$#@62;"$#@62; 名:$#@60;input type="Text" name="first"$#@62;$#@60;br$#@62; 姓:$#@60;input type="Text" name="last"$#@62;$#@60;br$#@62; 住址:$#@60;input type="Text" name="address"$#@62;$#@60;br$#@62; 职位:$#@60;input type="Text" name="position"$#@62;$#@60;br$#@62; $#@60;input type="Submit" name="submit" value="输入信息"$#@62; $#@60;/form$#@62; $#@60;/body$#@62; $#@60;/html$#@62; |
同样要注意$PATH_INFO的用法。就象我在第一课里讲到的,您可以在HTML代码中的任意位置使用PHP。您也会注意到,表格中的每一个元素都对应着数据库中的一个字段。这种对应关系并不是必须的,这么做只是更直观一些,便于您以后理解这些代码。
还要注意的是,我在Submit按钮中加入了name属性。这样我在程序中可以试探$submit变量是否存在。于是,当网页被再次调用时,我就会知道调用页面时是否已经填写了表格。
我应该指出,您不一定要把上面的网页内容写到PHP程序中,再返过来调用程序本身。您完全可以把显示表格的网页和处理表格的程序分开放在两个网页、三个网页甚至更多网页中,悉听尊便。放在一个文件中只是可以使内容更加紧凑而已。
那好,我们现在加入一些代码,来检查用户在表格中输入的内容。我会把用$HTTP_POST_VARS把所有查询参数变量都显示出来,这只不过是为了证明PHP确实把所有变量都传给了程序。这种方法是一个很有用的调试手段。如果您要想看全部的变量,可以用$GLOBALS。
$#@60;html$#@62; $#@60;body$#@62; $#@60;?php if ($submit) { // 处理表格输入 while (list($name, $value) = each($HTTP_POST_VARS)) { echo "$name = $value$#@60;br$#@62; "; } } else{ // 显示表格 ?$#@62; $#@60;form method="post" action="$#@60;?php echo $PATH_INFO?$#@62;"$#@62; 名:$#@60;input type="Text" name="first"$#@62;$#@60;br$#@62; 姓:$#@60;input type="Text" name="last"$#@62;$#@60;br$#@62; 住址:$#@60;input type="Text" name="address"$#@62;$#@60;br$#@62; 职位:$#@60;input type="Text" name="position"$#@62;$#@60;br$#@62; $#@60;input type="Submit" name="submit" value="输入信息"$#@62; $#@60;/form$#@62; $#@60;?php } // end if,if结束 ?$#@62; $#@60;/body$#@62; $#@60;/html$#@62; |
The program is now running normally, so we can now get the contents entered in the form and send them to the database.
$#@60;html$#@62; $#@60;body$#@62; $#@60;?php if ($submit) { // 处理表格输入 $db = mysql_connect("localhost", "root"); mysql_select_db("mydb",$db); $sql = "INSERT INTO employees (first,last,address,position) VALUES ($first,$last,$address,$position)"; $result = mysql_query($sql); echo "Thank you! Information entered. "; } else{ // 显示表格内容 ?$#@62; $#@60;form method="post" action="$#@60;?php echo $PATH_INFO?$#@62;"$#@62; 名:$#@60;input type="Text" name="first"$#@62;$#@60;br$#@62; 姓:$#@60;input type="Text" name="last"$#@62;$#@60;br$#@62; 住址:$#@60;input type="Text" name="address"$#@62;$#@60;br$#@62; 职位:$#@60;input type="Text" name="position"$#@62;$#@60;br$#@62; $#@60;input type="Submit" name="submit" value="输入信息"$#@62; $#@60;/form$#@62; $#@60;?php } // end if,if结束 ?$#@62; $#@60;/body$#@62; $#@60;/html$#@62; |
You have now inserted data into the database. However, there is still a lot of improvement work to be done. What if the user doesn't fill in a certain field? What should I do if I fill in text where numbers are required? Or what should I do if I fill it out incorrectly? don’t worry. Let's take it step by step.

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

The process of starting MySQL in Docker consists of the following steps: Pull the MySQL image to create and start the container, set the root user password, and map the port verification connection Create the database and the user grants all permissions to the database

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.
