Bind columns, Clash of Kings account binding_PHP tutorial

<?<span>php
    </span><span>try</span><span>{
        </span><span>$dbh</span> = <span>new</span> PDO('mysql:dbname=testdb;host=localhost', 'mysql_user', 'mysql_pwd'<span>);
        </span><span>$dbh</span>->setAttribute(PDO::ATTR_ERRMODE, PDO::<span>ERRMODE_EXCEPTION);
    }</span><span>catch</span>(PDOException <span>$e</span><span>){
        </span><span>echo</span> '数据库连接失败：'.<span>$e</span>-><span>getMessage();
        </span><span>exit</span><span>;
    }
　　
    </span><span>//</span><span>声明一个SELECT查询，从表contactInfo中获取D01部门的四个字段的信息</span>
    <span>$query</span> = "SELECT uid, name, phone, email FROM contactInfo WHERE departmentId='D01'"<span>;
    </span><span>try</span><span> {
        </span><span>$stmt</span> = <span>$dbh</span>->prepare(<span>$query</span>);　　　　　　                <span>//</span><span>准备声明好的一个查询</span>
        <span>$stmt</span>->execute();　　　　　　　　　　　                <span>//</span><span>执行准备好的查询</span>
        <span>$stmt</span>->bindColumn(1, <span>$uid</span>);　　　　　　　　            <span>//</span><span>通过列位置偏移数绑定变量$uid</span>
        <span>$stmt</span>->bindColumn(2, <span>$name</span>);                              <span>//</span><span>通过列位置偏移数绑定变量$name</span>
        <span>$stmt</span>->bindColumn('phone', <span>$phone</span>);                        <span>//</span><span>绑定列名称到变量$phone上</span>
        <span>$stmt</span>->bindColumn('email', <span>$email</span>);　　　　             <span>//</span><span>绑定列名称到变量$email上</span>

        <span>while</span> (<span>$stmt</span>->fetch(PDO::FETCH_BOUND)) {                <span>//</span><span>fetch()方法传入特定的参数遍历</span>
            <span>echo</span> <span>$uid</span>."\t".<span>$name</span>."\t".<span>$phone</span>."\t".<span>$email</span>."\n";    <span>//</span><span>输出自动将列值赋给对应变量的值</span>
<span>        }
    } </span><span>catch</span> (PDOException <span>$e</span><span>) {
        </span><span>echo</span> <span>$e</span>-><span>getMessage();
    }</span>