call to member function on a non-object error

codecowboy

Hi,

I am passing an object to a function and i get the following error when I try to call a function of that object from within the function that the object was passed to.

Here's the error message:

PHP Fatal error: Call to a member function query() on a non-object in C:\Program Files\Apache Group\Apache\htdocs\resume2\php\clsGenericObject.php on line 197

Here are some code snippets:

This is the function that i am passing the object to:

public function __construct(GenericObject $newGenObj, $newObjectTemplateImplementer){
    $this->genObj = $newGenObj;

    $this->objectTemplateImplementer = $newObjectTemplateImplementer;
    $this->arrFieldsInOrderWithValues = $this->genObj->getTableFieldNames();
}

My call to $this->genObj->getTableF.... is what is giving me the error:
$this->arrFieldsInOrderWithValues = $this->genObj->getTableFieldNames();

Here is the code for the genObj->getTableFieldNames() function including the line that the error message directly refers to which is line 197 inside of the GenericObject class:

public function getTableFieldNames(){
    $query = "SHOW COLUMNS FROM $this->table";

    $file = fopen("log.log", "a");
    $message = "getTableFieldNames() : 1 : $query \n\n";
    fwrite($file, $message);
    fclose($file);

197 $this->sql->query($query); (NOTE sql is a private member variable of the class. sql is another object that directly communicates with a database and i know that it works fine)

    $fields = $this->sql->getColumnValues("Field");

    return $fields;
}//end getTableFieldNames

Thank you for any help that you can give.

rebelo

codecowboy wrote:
197 $this->sql->query($query); (NOTE sql is a private member variable of the class. sql is another object that directly communicates with a database and i know that it works fine)

Everything here would indicate that $this->sql is not in fact set, or something similar is wrong.

Try adding before line 197:

var_dump($this->sql);die();

See what it has to say about it.