public InsertTrait::fields(array $fields, array $values = array())
Adds a set of field->value pairs to be inserted.
This method may only be called once. Calling it a second time will be ignored. To queue up multiple sets of values to be inserted at once, use the values() method.
Parameters
array $fields: An array of fields on which to insert. This array may be indexed or associative. If indexed, the array is taken to be the list of fields. If associative, the keys of the array are taken to