Compares two values of the same type, with the exception that a value of any type can be compared to a GDA_TYPE_NULL value, specifically:
<itemizedlist> <listitem><para>if value1 and value2 are both GDA_TYPE_NULL values then the
returned value is 0</para></listitem> <listitem><para>if value1 is a GDA_TYPE_NULL value and
value2 is of another type then the returned value is -1</para></listitem> <listitem><para>if
value1 is of another type and value2 is a GDA_TYPE_NULL value then the returned value is 1</para></listitem
> <listitem><para>in all other cases, value1 and value2 must be of the same type and their
values are compared</para></listitem> </itemizedlist>
| value1 |
a Value to compare (not null) |
| value2 |
the other Value to be compared to |
|
if both values have the same type, returns 0 if both contain the same value, an integer less than 0 if |