How to use query method in ThinkPHP5
May 28, 2023 pm 12:46 PM
1. How to use the sum of queries
In ThinkPHP5, the sum of queries can be realized through the query and sum methods. The query method is used to create a SQL statement, while the sum method is used to execute the SQL statement and obtain the sum from the query results.
Specifically, the query sum is used as follows:
<code>//導(dǎo)入命名空間<br/>use think\Db;<br/><br/>//構(gòu)建SQL語句<br/>$result = Db::query('SELECT SUM(column_name) AS total FROM table_name');<br/><br/>//取出查詢結(jié)果中的和<br/>$sum = $result[0]['total'];<br/></code>
In the above code, we first quoted the think\Db namespace, and then used the query method to write the SQL statement. Among them, SUM(column_name) is used to calculate the sum of all values ??in column column_name, and AS total is used to set the name of the calculation result to total. Then, we execute the query method to query the SQL statement and obtain the sum of the query results, which is $result0.
2. Examples of sum of queries
The following uses an example to introduce the use of sum of queries in ThinkPHP5.
Suppose there is a table named students in our database, which contains the performance information of each student, as shown below:
<code>id name grade1 grade2 grade3<br/>1 張三 80 90 85<br/>2 李四 75 82 93<br/>3 王五 90 85 87<br/>...<br/></code>
We need to query the total scores of all students and follow Sort by total score in descending order. We can use the following code to achieve this:
<code>//導(dǎo)入命名空間<br/>use think\Db;<br/><br/>//構(gòu)建SQL語句<br/>$sql = "SELECT id, name, (grade1 + grade2 + grade3) AS total_grade FROM students ORDER BY total_grade DESC";<br/><br/>//執(zhí)行SQL語句并取出查詢結(jié)果中的和<br/>$results = Db::query($sql);<br/><br/>//輸出查詢結(jié)果<br/>echo "<table>";<br/>echo "<tr><th>ID</th><th>姓名</th><th>總成績</th></tr>";<br/>foreach($results as $result){<br/> echo "<tr><td>".$result['id']."</td><td>".$result['name']."</td><td>".$result['total_grade']."</td></tr>";<br/>}<br/>echo "</table>";<br/></code>We first introduced the think\Db namespace and used the SELECT statement to construct the SQL statement. Among them, (grade1 grade2 grade3) is used to calculate the total grade of each student, and the name of the calculation result is set to total_grade. Then, we execute the query method to execute the SQL statement and obtain the query results. Finally, we output the query results on the page.
The above is the detailed content of How to use query method in ThinkPHP5. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
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)
How to run thinkphp project
Apr 09, 2024 pm 05:33 PM
To run the ThinkPHP project, you need to: install Composer; use Composer to create the project; enter the project directory and execute php bin/console serve; visit http://localhost:8000 to view the welcome page.
There are several versions of thinkphp
Apr 09, 2024 pm 06:09 PM
ThinkPHP has multiple versions designed for different PHP versions. Major versions include 3.2, 5.0, 5.1, and 6.0, while minor versions are used to fix bugs and provide new features. The latest stable version is ThinkPHP 6.0.16. When choosing a version, consider the PHP version, feature requirements, and community support. It is recommended to use the latest stable version for best performance and support.
How to run thinkphp
Apr 09, 2024 pm 05:39 PM
Steps to run ThinkPHP Framework locally: Download and unzip ThinkPHP Framework to a local directory. Create a virtual host (optional) pointing to the ThinkPHP root directory. Configure database connection parameters. Start the web server. Initialize the ThinkPHP application. Access the ThinkPHP application URL and run it.
Which one is better, laravel or thinkphp?
Apr 09, 2024 pm 03:18 PM
Performance comparison of Laravel and ThinkPHP frameworks: ThinkPHP generally performs better than Laravel, focusing on optimization and caching. Laravel performs well, but for complex applications, ThinkPHP may be a better fit.
How to install thinkphp
Apr 09, 2024 pm 05:42 PM
ThinkPHP installation steps: Prepare PHP, Composer, and MySQL environments. Create projects using Composer. Install the ThinkPHP framework and dependencies. Configure database connection. Generate application code. Launch the application and visit http://localhost:8000.
How is the performance of thinkphp?
Apr 09, 2024 pm 05:24 PM
ThinkPHP is a high-performance PHP framework with advantages such as caching mechanism, code optimization, parallel processing and database optimization. Official performance tests show that it can handle more than 10,000 requests per second and is widely used in large-scale websites and enterprise systems such as JD.com and Ctrip in actual applications.
Development suggestions: How to use the ThinkPHP framework for API development
Nov 22, 2023 pm 05:18 PM
Development suggestions: How to use the ThinkPHP framework for API development. With the continuous development of the Internet, the importance of API (Application Programming Interface) has become increasingly prominent. API is a bridge for communication between different applications. It can realize data sharing, function calling and other operations, and provides developers with a relatively simple and fast development method. As an excellent PHP development framework, the ThinkPHP framework is efficient, scalable and easy to use.
Development suggestions: How to use the ThinkPHP framework to implement asynchronous tasks
Nov 22, 2023 pm 12:01 PM
"Development Suggestions: How to Use the ThinkPHP Framework to Implement Asynchronous Tasks" With the rapid development of Internet technology, Web applications have increasingly higher requirements for handling a large number of concurrent requests and complex business logic. In order to improve system performance and user experience, developers often consider using asynchronous tasks to perform some time-consuming operations, such as sending emails, processing file uploads, generating reports, etc. In the field of PHP, the ThinkPHP framework, as a popular development framework, provides some convenient ways to implement asynchronous tasks.
