MySql update works fine when I apply the text to MySql Command but not as part of my program

jobheadclass.php
I pass an array of field values, to a function that creates a MySql update statement and reading the error it seems to doubt that my mysquli resources are correct.

I have included a copy of jobheadclass.php in here is the constructor for objects of jobhead class.

Three other functions are included as well, one = initialisejob works well, getmessage is trivial and the last of these is update newjobhead.

This function receives an array of data and is designed to update an existing record in the table. However there is a screen print with the following warning

Warning: mysquli_query() expects parameter 1 to be mysqli, null given in C:\wamp\bin\apache2.2.21\htdocs\SAMS\include\jobheadclass.inc on line 134

Plus the following error

Fatal error: Call to undefined method mysquli::error() in C:\wamp\bin\apache2.2.21\htdocs\SAMS\include\jobheadclass.inc on line 137

see file two messages.doc

and

jobheadclass.php

I would be grateful if anybody can help

Thanks very much

John
two-messages.doc
johnecollinsAsked:
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theGhost_k8Database ConsultantCommented:
still reading your question but "mysquli"??
shouldn't it be mysqlui ?? is it correct?
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Dave BaldwinFixer of ProblemsCommented:
In jobheadclass.inc , $cxn is not assigned a value anywhere that I could find.
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Ray PaseurCommented:
This is pretty self-explanatory:
Call to undefined method mysquli::error()

And on line 134, you probably want this
if(!$res = mysqli_query($this->cxn, $sql))

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Ray PaseurCommented:
Just a sidebar note... I found some other instances of $cxn and $this->cxn in other parts of the script.  You might want to make a coding practice that avoids naming class properties and local variables with the same kinds of names.  It's just too easy to confuse the meaning of the variables when the names are so similar.
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johnecollinsAuthor Commented:
Hi Ray,

Thanks for looking in, you were of course right I entered your amendment and it worked.

I am struggling with many things relative to my development, things like returns from SQL statements, and being sure I have chosen the correct mysqli command or that I got the desired result, is there somewhere that I can consult and interpret the values returned.

Plus how I can setup connections correctly.

Thanks Ray

John
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