>我有这样的表格：
users_info:
userID | title | content
1 | Firstname | Tester
1 | Lastname | Wester
2 | Firstname | LKks
我想使用 PHP 函数检查数据库中是否已经存在名字和姓氏。如何运行简单的查询来检查是否有任何结果？名字的变量是：$firstname，姓氏的变量是$lastname。
感谢您的帮助！
我认为最好的方法是子查询。
SELECT userID from users_info where title = 'Firstname' and content = '$firstname' AND
userID IN (SELECT userID from users_info where title = 'Lastname' and content = '$lastname')
如果得到任何结果。 您有具有此名字的行和具有相同 ID 的姓氏。
function tableValidate($firstname, $lastname)
{
$query = $dbConnect->prepare("SELECT * FROM users_info WHERE title = ? AND content = ?");
$query->bindValue(1, 'Firstname');
$query->bindValue(2, $firstname);
$query->execute();
try
{
$result = $query->rowCount();
}
catch(PDOException $e)
{
die($e->getMessage());
}
$queryOne = $dbConnect->prepare("SELECT * FROM users_info WHERE title = ? AND content = ?");
$queryOne->bindValue(1, 'Lastname');
$queryOne->bindValue(2, $lastname);
$queryOne->execute();
try
{
$resultOne = $queryOne->rowCount();
}
catch(PDOException $e)
{
die($e->getMessage());
}
if($result > 0 && $resultOne > 0)
{
echo "Firstname and Lastname Exists";
}
else if ($result > 0)
{
echo "Firstname Exists";
}
else if ($resultOne > 0)
{
echo "Lastname Exists";
}
else
{
echo "Success";
}
}