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Php versions – update datetime with null value in mysql by php

I’m using this code to update my datatime field to NULL,
php version 7.3.7

    if($_POST['value']=='0000-00-00 00:00:00'){
      $timestamp=NULL;
    }else {
      $dateTime = $_POST['value'];
      $timestamp = date('Y-m-d H:i', strtotime($_POST['value']));
   }
$query="update forms set $_POST[limitInputField]='$timestamp' where  formid='$_POST[formId]'";
$result=$dbCnn->query($query)or die($dbCnn->error);

it gives error when $timestamp is null:

Incorrect datetime value: ” for column farsifor_m.forms.enddate at row 1

But when I quote “NULL” and remove quotations around $timestamp in the query, if
$timestamp is null it works properly but if $timestamp value is not null it gives error.

   if($_POST['value']=='0000-00-00 00:00:00'){
     $timestamp="NULL";
   }else {
     $dateTime = $_POST['value'];
     $timestamp = date('Y-m-d H:i', strtotime($_POST['value']));
   }
  $query="update forms set $_POST[limitInputField]=$timestamp where       formid='$_POST[formId]'";
    $result=$dbCnn->query($query)or die($dbCnn->error);
Tags:

3

Answers


  1. 0

    You can resolve this with some slight changes to your code (take note of single and double quotes):

        if($_POST['value']=='0000-00-00 00:00:00'){
      $timestamp="NULL";
    }else {
      $dateTime = $_POST['value'];
      $timestamp = "'".date('Y-m-d H:i', strtotime($_POST['value']))."'";
   }
$query="update forms set $_POST[limitInputField]=$timestamp where  formid='$_POST[formId]'";

    This way if you’re setting a NULL value in timestamp the query would look something like this:

    update forms set limitInputField=NULL where formid='123'

    But if you’re putting a value in there it would look like this:

    update forms set limitInputField='2019-09-03 17:08' where formid='123'

    Important to note there are no quotes around the NULL when setting the value, but there are around the date.

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  2. 0

    Learn to use prepared statements; and do not inject post variables to “build” the query. Having said that:

    You can use NULLIF for convenience. In the following example the specific value 0000-00-00 00:00:00 will be converted to NULL:

    UPDATE forms SET col = NULLIF(:timestamp, '0000-00-00 00:00:00') WHERE formid = :formid

    Or you can simply:

    UPDATE forms SET col = :timestamp WHERE formid = :formid

    And use PHP to pass a variable containing string or null.

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  3. 0 
    $date = $_POST['Date']; //get date from form
$time = $_POST['Time']; //get time from form

if(strtotime($date.$time)==0){ // check if null or not 
    $AboutDate = "0000-00-00 00:00:00"; 
}else{                        
    $AboutDate = date("Y-m-d H:i", strtotime($date.$time)); 
}

    Then Update/Insert into SQL

    UPDATE xxx(table) SET xxx(column) = NULLIF('$AboutDate','0000-00-00 00:00:00') WHERE xxxx = xxxxx

    Let’s go BABY

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