4.2.4. MySQL PHP syntax

发布时间 :2025-10-25 12:31:19 UTC      

MySQL can be used in many languages, including PERL, C, Cellular, JAVA and PHP. Among these languages, MySQL is the most widely used in PHP’s web development.

Most of our examples in this tutorial use the PHP language. If you want to know more about the application of MySQL in PHP, you can visit our PHP 中使用 Mysqli 介绍 .

PHP provides several ways to access and manipulate Mysql database records. The format of PHP MySQL function is as follows:

mysqli_function(value,value,...);

The function section of the above format describes the functions of the mysql function, such as

mysqli_connect($connect);
mysqli_query($connect,"SQL 语句");
mysqli_fetch_array()
mysqli_close()

The following example shows the syntax for PHP to call the mysql function:

Instance (MySQLi)

<?php$retval=mysqli_function(value,[value,...]);if(!$retval){die("相关错误信息");}//其他
MySQL 或 PHP 语句?>

Starting with the next chapter, we will learn more about MySQL functions.

Principles, Technologies, and Methods of Geographic Information Systems  102

In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress.