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.
| this |
a server provider. |
| cnc |
a Connection object, or null |
| string |
the SQL string to convert to a value |
| preferred_type |
a Type, or INVALID |
| dbms_type |
place to get the actual database type used if the conversion succeeded, or null |
|
a new Value, or null |