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);

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

// 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 ('百度','https://www.baidu.com/','4','CN')");
 
mysqli_close($con);
?>

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