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 |
| 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 |
Returns:
|
a new Value, or |