找不到PDO SQL删除语句

Question

我在尝试通过PDO执行的SQL语句遇到麻烦。没有异常只会引发警告：“ sh：1：DELETE：not found”。我不确定错误是否出在我的语法中或pdo的安装/设置是否有帮助？

try {
    $ConnectionObj = new PDO("mysql:host=localhost;dbname=Person", 'user', '1234');
    $ConnectionObj->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $SqlStr = "DELETE FROM Details WHERE EmailAddress = '".$EmailAddrStr."' ";
    exec($SqlStr);
    //echo "Person deleted"."\n";
}
catch (PDOException $exception) {
    echo $exception;
}

Answer 1

exec()不是PDO函数，它用于运行外部应用程序：

exec

(PHP 4, PHP 5, PHP 7)

exec — Execute an external program
Description 
exec ( string $command [, array &$output [, int &$return_var ]] ) : string

exec() executes the given command.

相反，请执行以下操作：

$conn = new PDO('mysql:host=localhost;dbname=db', 'usr', 'pass');

$sql = "DELETE FROM Details WHERE EmailAddress = :addr";
$stmt = $conn->prepare($sql);
$stmt->execute([':addr' => $EmailAddrStr]);

可以找到更多信息here：