Table of Contents
Common commands for PHP database operations, common commands for PHP databases
Home Backend Development PHP Tutorial Common commands for PHP database operations, common commands for PHP database_PHP tutorial

Common commands for PHP database operations, common commands for PHP database_PHP tutorial

Jul 12, 2016 am 09:03 AM
mysql

Common commands for PHP database operations, common commands for PHP databases

<?<span>php
</span><span>//</span><span>设置字符集</span>
<span>header</span>("content-type:text/html;charset=utf8"<span>);
</span><span>//</span><span>连接数据库并判断成功与否</span>
<span>$link</span>=<span>mysql_connect</span>('localhost','root','root')or <span>die</span> ('连接失败'<span>);
</span><span>//</span><span>选择数据库</span>
<span>mysql_select_db</span>('数据库名'<span>);
</span><span>//</span><span>设置字符集</span>
mysql_set_charset('utf8'<span>);
</span><span>//</span><span>准备sql语句</span>
<span>$sql</span>="select * from user"<span>;
</span><span>//</span><span>发送sql语句</span>
<span>$result</span>=<span>mysql_query</span>(<span>$sql</span><span>);
</span><span>//</span><span>判断执行的sql语句是否成功</span>
<span>if</span>(<span>$result</span> && <span>mysql_affected_rows</span>()>0<span>){
    </span><span>echo</span> '查询成功'<span>;
}</span><span>else</span><span>{
    </span><span>echo</span> '查询失败'<span>;
}
</span><span>//</span><span>关闭数据库连接</span>
<span>mysql_close</span><span>();

</span><span>//</span><span>PHP数据库操作常用命令</span>
<span>require</span> ,<span>include</span><span>//</span><span>使用 函数将某个文件包含进来</span>
<span>mysql_connect</span>('localhost','root','root')<span>//</span><span>连接数据库</span>
<span>mysql_select_db</span>('数据库名')<span>//</span><span>选择数据库</span>
mysql_set_charset('utf8')<span>//</span><span>设置字符集</span>

<span>mysql_errno</span>()<span>//</span><span>错误号</span>
<span>mysql_error</span>()<span>//</span><span>错误信息</span>

<span>mysql_query</span>('sql语句')<span>//</span><span>执行sql语句成功返回资源,失败返回false</span>
<span>mysql_free_result</span>(<span>$result</span>)<span>//</span><span>释放资源</span>
<span>mysql_close</span>()<span>//</span><span>关闭数据库</span>
<span>mysql_affected_rows</span>(<span>$link</span>)<span>//</span><span>返回受影响行数 一般 添加 修改 删除的时候进行判断</span>
<span>mysql_insert_id</span>(<span>$link</span>)<span>//</span><span>如果表中有自增id 添加成功将通过此函数返回自增id</span>
<span>mysql_num_rows</span>(<span>$result</span>)<span>//</span><span>只用于查询 返回结果集中的记录数</span>

<span>mysql_fetch_array</span>(<span>$result</span>)<span>//</span><span>将结果集中的记录以数组的形式返回 混合数组 了解即可</span>
<span>mysql_fetch_row</span>(<span>$result</span>)<span>//</span><span>将结果集中的记录以数组的形式返回 索引数组 了解即可</span>
<span>mysql_fetch_assoc</span>(<span>$result</span>)<span>//</span><span>将结果集中的记录以数组的形式返回 关联数组  推荐使用并且掌握</span>
Copy after login

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1082220.htmlTechArticleCommon commands for PHP database operations, common commands for php database? php // Set character set header ("content-type: text/html;charset=utf8" ); // Connect to the database and determine success $link =...
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP's big data structure processing skills PHP's big data structure processing skills May 08, 2024 am 10:24 AM

PHP's big data structure processing skills

How to optimize MySQL query performance in PHP? How to optimize MySQL query performance in PHP? Jun 03, 2024 pm 08:11 PM

How to optimize MySQL query performance in PHP?

How to use MySQL backup and restore in PHP? How to use MySQL backup and restore in PHP? Jun 03, 2024 pm 12:19 PM

How to use MySQL backup and restore in PHP?

How to insert data into a MySQL table using PHP? How to insert data into a MySQL table using PHP? Jun 02, 2024 pm 02:26 PM

How to insert data into a MySQL table using PHP?

What are the application scenarios of Java enumeration types in databases? What are the application scenarios of Java enumeration types in databases? May 05, 2024 am 09:06 AM

What are the application scenarios of Java enumeration types in databases?

How to fix mysql_native_password not loaded errors on MySQL 8.4 How to fix mysql_native_password not loaded errors on MySQL 8.4 Dec 09, 2024 am 11:42 AM

How to fix mysql_native_password not loaded errors on MySQL 8.4

How to use MySQL stored procedures in PHP? How to use MySQL stored procedures in PHP? Jun 02, 2024 pm 02:13 PM

How to use MySQL stored procedures in PHP?

How to create a MySQL table using PHP? How to create a MySQL table using PHP? Jun 04, 2024 pm 01:57 PM

How to create a MySQL table using PHP?

See all articles