php - UPDATE 语句中的 SQL 语法错误

Question

$sql_select3 = "UPDATE `pdfhash` 
SET `PdfHash` = '$pdf1hash',`DateModified` = '.$date.' 
WHERE `Filename` ='current.pdf'";

此 SQL 语句返回一个错误，说明这一点

Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'current.pdf'',`DateModified` = 'Thursday the 30th ' WHERE `Filename` ='.current.' at line 1

Answer 1

像这样不正确的引用使用，

$sql_select3 = "UPDATE `pdfhash` SET `PdfHash` = '$pdf1hash',
               `DateModified` = " . $date ." 
                WHERE `Filename` ='current.pdf'";

Answer 2

尝试这个

$sql_select3 = "UPDATE `pdfhash` SET `PdfHash` = '".$pdf1hash."',`DateModified` = '".$date."' WHERE `Filename` ='current.pdf'";

这会有所帮助。

Answer 3

代替

'.$date.'

和

'".$date."'

Answer 4

$sql_select3 = "UPDATE pdfhashSET PdfHash= '$pdf1hash', DateModified= '".$date."' WHERE Filename='current.pdf'";

'.$日期。' 至

'".$date."'