How to call database in php

How PHP calls the database: first connect to the database through the "mysqli_connect" method; then execute the command "show databaces"; and finally send the command to the MySQL server.

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1. Three ways to call the database Method:

Command (cmd), language call (PHP, GO), third-party software.

Command mode:

Language call:

<?php
//链接数据库
$link = mysqli_connect(&#39;localhost&#39;, &#39;root&#39;, &#39;&#39;);
//SQL命令的准备
$sql = &#39;show databaces&#39;;
//讲话命令发送到MySQL服务器
$res = mysqli_query($link, $sql);
var_dump($res);
?>

Third-party software:

2. Operation process

1. Link database
2. Set encoding (Communication encoding)
3. Write SQL statements
4. Send SQL statements to MySQL server
5. MuSQL server receives SQL statements and parses them

6. Parsing completed Finally, return the result to the calling program

   

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