PHP mysqli_query() function definition and usage

Definition and usage

mysqli_query() function executes a query against the database.

Syntax

mysqli_query(connection,query,resultmode);

Parameter description:

connection Required, specifies the MySQL connection to be used.

query Required, specifies the query string.

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

1.MYSQLI_USE_RESULT (use this if you need to retrieve a large amount of data)

2.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.

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

PHP mysqli_query() function usage example:

Execute a query against the database:

Delete 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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