The role of mysqli_query function in php

The role of mysqli_query function in php

Definition and usage

## The #mysqli_query() function executes a query against the database.

Syntax

mysqli_query(connection,query,resultmode);

Parameters

connection required. Specifies the MySQL connection to use.

query Required, specifies the query string.

resultmode

Optional. a constant. Can be any of the following values:

MYSQLI_USE_RESULT (use this if you need to retrieve large amounts of data)

MYSQLI_STORE_RESULT (default)

Return value: For a successful SELECT , SHOW, DESCRIBE or EXPLAIN query will return a mysqli_result object. For other successful queries, TRUE will be returned. On failure, returns FALSE.

PHP Version: 5

Update log: The asynchronous query function is added in PHP 5.3.0.

Execute a query against the database:

Delete the database

<?php 
// 假定数据库用户名：root，密码：123456，数据库：RUNOOB 
$con=mysqli_connect("localhost","root","123456","RUNOOB"); 
if (mysqli_connect_errno($con)) 
{ 
    echo "连接 MySQL 失败: " . mysqli_connect_error(); 
} 
 
// 执行查询
mysqli_query($con,"SELECT * FROM websites");
mysqli_query($con,"INSERT INTO websites (name, url, alexa, country)
VALUES (&#39;百度&#39;,&#39;https://www.baidu.com/&#39;,&#39;4&#39;,&#39;CN&#39;)");
 
mysqli_close($con);
?>

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