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How to pass only changed fields to sql UPDATE?

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Mar 10.2010

Trying to construct a sql statement to update field values contained in a form. I would like to only update the values that are changed. If the current $_POST[] values populated in the form are not changed, there is no need to add that field to the UPDATE statement… but i am not sure how to do this with javascript and pass only those values. Can someone help?

Some say that it is not worth the code processing to do this but I would like to do this if possible. I know that phpmyadmin works this way.

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@Gozzy82Mar 10.2010 — you can store the values in a session and check if the values you get from post are different ifso change it

or you can add all the values to a hidden input and compare with that or you add hidden inputs which you set to true/false when the input has been changed

something like

<input type="text" name="firstname" value="blaat" onclick="change(this.name);" />

<input type="hidden" name="firstname_hidden" value="0" />


function change(name){

document.getElementsByName(name + '_hidden')[0].value = '1';

}

on post check the hidden inputs and update accordingly

but i agree its too much work for such a thing and besides if you know phpadmin does it why dont you use the method you have seen in phpadmin?
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@mellowauthorMar 10.2010 — Thanks for the help. I will try your suggestions.

I have not looked at the source code for phpmyadmin... only noticed that when I use it, it only posts changed-value fields.
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