* @param array $values An array of values to SET. For each array element,
* the key gives the field name, and the value gives the data to set
* that field to. The data will be quoted by IDatabase::addQuotes().
+ * Values with integer keys form unquoted SET statements, which can be used for
+ * things like "field = field + 1" or similar computed values.
* @param array $conds An array of conditions (WHERE). See
* IDatabase::select() for the details of the format of condition
* arrays. Use '*' to update all rows.
* @param array $set An array of values to SET. For each array element, the
* key gives the field name, and the value gives the data to set that
* field to. The data will be quoted by IDatabase::addQuotes().
+ * Values with integer keys form unquoted SET statements, which can be used for
+ * things like "field = field + 1" or similar computed values.
* @param string $fname Calling function name (use __METHOD__) for logs/profiling
* @throws Exception
* @return bool