mysqli_query failed in php

PHP mysqli_query() function

Definition and usage (Recommended learning: PHP video tutorial）

mysqli_query() function executes a query against the database.

Syntax

mysqli_query(connection,query,resultmode);<br/>

Parameter description:

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, a mysqli_result object will be returned. For other successful queries, TRUE will be returned. On failure, returns FALSE.

Execute a query against the database:

Delete database

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

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