It's the empty slot, it's the missing information, it's the unanswered question. Rocket Hazmat Rocket Hazmat k 36 36 gold badges silver badges bronze badges. Email Required, but never shown. To me that's what "optional" means. Featured on Meta.
MySQL IFNULL Practical Examples of IFNULL Function
To pass a NULL to MySQL, you do just that. INSERT INTO table (field,field2) VALUES (NULL,3). So, in your code, check if $intLat, $intLng are. › questions › php-mysql-insert-null-if-variable-is.
Empty string in notnull column in MySQL
If you want to insert a NULL value into MySQL, you have to pass a null-value, insert empty strings or change the column to accept null values.
SaschaM78 3, 3 3 gold badges 26 26 silver badges 36 36 bronze badges. A variable is considered to be null if: it has been assigned the constant NULL.
He'll only get NULL for default, if the table is set up that way. The special NULL value represents a variable with no value.
Relying on this feature is highly discouraged.
In innoDB, NULL occupies less space as compared to empty string.
PHP NULL Manual
Also, the NULL length is null while length of the empty string is 0.
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But you must use the function constant "NULL" ; to get it's value. Related Louis 2, 1 1 gold badge 14 14 silver badges 21 21 bronze badges.
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|Feedback post: Moderator review and reinstatement processes. Active 1 year, 7 months ago. It's a bit of semantic awkwardness to speak of a "null value", but if a variable can exist without having a value, the language and implementation have to have something to represent that situation.
For those without the temperature sensor I needed NULL and not 0, for obvious reasons 0 is an accepted temperature value also. This is how I tried it:. First is that you are using string concatenation instead of prepared statements. Sign up using Facebook.
Sometimes you want NULL values to be returned with a different value, such as “N/A”, “Not Applicable”, “None”, or even the empty string “”.
Video: Mysql if null then empty string php mySQL Test for Null and Blank
MySQL IFNULL() takes two expressions and if the first expression is not context in which it is used, it returns either numeric or string value.
Linked 1. Email Required, but never shown. Last but not least, generally there isn't a need to explicitly check for null in postvars and then pass a null again.
Detecting MySQL NULL in PHP PHP The SitePoint Forums
Hope this helps, I just had to use this for some hardware data loggers, some of them collecting temperature and radiation, others only radiation.
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|First is that you are using string concatenation instead of prepared statements. Featured on Meta. But crucially, you are still surrounding the column value in single quotes, so you are back to square one, assigning a string, not a database NULL.
Check the variables before building the query, if they are empty, change them to the string NULL. For some reason, radhoo's solution wouldn't work for me.