alter_value_attributes
Description:
Alters the attributes of the value stored at (proxy_row, col) in this.
the alter_flags can only contain the GDA_VALUE_ATTR_IS_NULL, GDA_VALUE_ATTR_IS_DEFAULT and GDA_VALUE_ATTR_IS_UNCHANGED flags (
other flags are ignored).
Parameters:
| this |
a DataProxy object |
| proxy_row |
A proxy row number |
| col |
a valid column number |
| alter_flags |
flags to alter the attributes |