Creates a new GValue which represents the SQL value given as argument.
This is the opposite of the function get_sql_from_value. The type argument is used to determine the real data type requested for the returned value.
If the sql string is null, then the returned GValue is of type GDA_TYPE_NULL; if the
sql string does not correspond to a valid SQL string for the requested type, then the null
is returned.
| this |
an object which implements the DataHandler interface |
| sql |
an SQL string, or null |
| type |
a GType |
|
the new Value or null on error |