Function to execute query in php

The function that executes queries in PHP is mysqli_query(), which requires a connection handle and a SQL query string as parameters, and returns a mysqli_result object representing the query result.

Function to execute query in PHP

Question:Function to execute query in PHP What is it?

Answer: mysqli_query() function

Detailed explanation:

mysqli_query() function is used to execute on the MySQL database SQL query. This function accepts two parameters:

• Connection handle: The mysqli object that represents the connection to the MySQL database.
• Query string: The SQL query to be executed.

This function returns a mysqli_result object, representing the result of the query. If the query fails, returns FALSE.

Usage:

The following example demonstrates how to use the mysqli_query() function:

<code class="php"><?php
$conn = mysqli_connect("localhost", "username", "password", "database");
$sql = "SELECT * FROM users";
$result = mysqli_query($conn, $sql);

if ($result) {
  // 处理查询结果
} else {
  // 处理查询错误
}
mysqli_close($conn);
?></code>

Notes:

• The mysqli_query() function is only available for MySQL databases.
• Before executing the query, you must first use the mysqli_connect() function to establish a connection to the database.
• The query string must be valid SQL syntax.
• Please handle errors properly to prevent query failure.

The above is the detailed content of Function to execute query in php. For more information, please follow other related articles on the PHP Chinese website!