PHP PDO

PHP Data Objects (PDO) extension defines a lightweight, consistent interface for PHP to access databases.

<code><span><span><?php </span><span>try</span> {
        <span>$dsn</span> = <span>"mysql:host=localhost; port=3306; dbname=wsq_hotel; charset=utf-8"</span>;
        <span>$user</span> = <span>'root'</span>;
        <span>$psw</span> =<span>'root'</span>;
        <span>$pdo</span> = <span>new</span> PDO(<span>$dsn</span>,<span>$user</span>,<span>$psw</span>);
        <span>$sql</span> = <span>'select goods_prices from wsq_goods_info where goods_id=2'</span>;
        <span>// $sql = "show database";</span><span>$res</span> = <span>$pdo</span>->query(<span>$sql</span>) <span>or</span> var_dump(<span>$pdo</span>->errorInfo());
        <span>// var_dump($res);</span><span>$mon</span> = <span>$res</span>->fetch(PDO::FETCH_ASSOC);
        <span>echo</span><span>$mon</span>[<span>'goods_price'</span>];
    } <span>catch</span> (PDOException <span>$e</span>) {
        <span>echo</span><span>$e</span>->getMessage();
    }
 <span>?></span></span></span></code>

PDO operation transaction

<code><span>//开启事务</span><span>beginTransacition()</span><span>//回滚</span><span>rollback()</span><span>//提交</span><span>commit()</span><span>//判断是否处于事务之中</span><span>inTransaction()</span></code>

Returns the ID of the last inserted row
PDO::lastInsertID()

exec() execution
Compared with query(), exec() returns the number of affected rows

<code><span>$sql</span> = <span>"insert into table values('<span>$val</span>')"</span>;
<span>if</span>(<span>false</span>===<span>$pdo</span>-><span>exec</span>(<span>$sql</span>)){
    <span>echo</span><span>'执行失败'</span>;
}</code>

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The above is an introduction to PDO in PHP, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.