Heim >Backend-Entwicklung >PHP-Tutorial >PHP数据库操作常用命令,php数据库常用命令_PHP教程

PHP数据库操作常用命令,php数据库常用命令_PHP教程

WBOY
WBOYOriginal
2016-07-12 09:03:15753Durchsuche

PHP数据库操作常用命令,php数据库常用命令

<?<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>

 

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/1082220.htmlTechArticlePHP数据库操作常用命令,php数据库常用命令 ? php // 设置字符集 header ("content-type:text/html;charset=utf8" ); // 连接数据库并判断成功与否 $link =...
Stellungnahme:
Der Inhalt dieses Artikels wird freiwillig von Internetnutzern beigesteuert und das Urheberrecht liegt beim ursprünglichen Autor. Diese Website übernimmt keine entsprechende rechtliche Verantwortung. Wenn Sie Inhalte finden, bei denen der Verdacht eines Plagiats oder einer Rechtsverletzung besteht, wenden Sie sich bitte an admin@php.cn