检查PHP行是否存在SQL行 [英] check if SQL row exists with PHP

问题描述

我使用MySQL和PHP，我需要做这样的事情（伪代码）：

I'm using MySQL with PHP and I need to do something like this (pseudocode):

if (sql row exists where username='bob')
{
    // do this stuff
}

推荐答案

如果您使用的是mysql数据库，请使用以下内容：

If you are using mysql database, then use the following -

$query = "SELECT username from my_table where username='bob'";
$result = mysql_query($query);

if(mysql_num_rows($result) > 0)
{
    // row exists. do whatever you would like to do.
}

如果您要使用 PDO（PHP数据对象） 使用以下代码 -

If you would like to use PDO (PHP Data Object), as alex suggested, then use the following code -

$dbh = new PDO("mysql:host=your_host_name;dbname=your_db_name", $user, $pass);
$stmt = $dbh->prepare("SELECT username from my_table where username = ':name'");
$stmt->bindParam(":name", "bob");
$stmt->execute();

if($stmt->rowCount() > 0)
{
    // row exists. do whatever you want to do.
}

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