string_to_value
Description:
Use this to create a new Value from a single string representation.
The preferred_type
can optionally ask this to return a
Value of the requested type (but if such a value can't be created from string
, then null is returned); pass INVALID
if any returned type is acceptable.
The returned value is either a new Value or null in
the following cases: - string
cannot be converted to preferred_type
type - the provider does not handle
preferred_type
- the provider could not make a Value from string
If dbms_type
is not null, then if will contain a constant string representing the database type
used for the conversion if the conversion was successfull, or null otherwise.
Parameters:
this |
a server provider. |
cnc |
a Connection object, or null |
string |
the SQL string to convert to a value |
preferred_type | |
dbms_type |
place to get the actual database type used if the conversion succeeded, or null |
Returns:
a new Value, or null |