Wt
3.2.2
|
Default traits for a class mapped with Wt::Dbo. More...
#include <Wt/Dbo/Dbo>
Public Types | |
typedef long long | IdType |
Type of the primary key. | |
Static Public Member Functions | |
static IdType | invalidId () |
Returns the sentinel value for a null id. | |
static const char * | surrogateIdField () |
Returns the database field name for the surrogate primary key. | |
static const char * | versionField () |
Configures the optimistic concurrency version field. |
Default traits for a class mapped with Wt::Dbo.
This class provides the default traits. It is convenient (and future proof) to inherit these default traits when customizing the traits for one particular class.
typedef long long Wt::Dbo::dbo_default_traits::IdType |
Type of the primary key.
The default corresponds to a surrogate key, which is long long
.
Reimplemented in Wt::Dbo::dbo_traits< C >, Wt::Dbo::dbo_traits< AuthToken< AuthInfoType > >, Wt::Dbo::dbo_traits< UserType >, Wt::Dbo::dbo_traits< DboType >, Wt::Dbo::dbo_traits< AuthInfo< UserType > >, Wt::Dbo::dbo_traits< AuthIdentity< AuthInfoType > >, and Wt::Dbo::dbo_traits< AuthInfoType >.
static IdType Wt::Dbo::dbo_default_traits::invalidId | ( | ) | [static] |
Returns the sentinel value for a null
id.
The default implementation returns -1.
Reimplemented in Wt::Dbo::dbo_traits< C >, Wt::Dbo::dbo_traits< AuthToken< AuthInfoType > >, Wt::Dbo::dbo_traits< UserType >, Wt::Dbo::dbo_traits< DboType >, Wt::Dbo::dbo_traits< AuthInfo< UserType > >, Wt::Dbo::dbo_traits< AuthIdentity< AuthInfoType > >, and Wt::Dbo::dbo_traits< AuthInfoType >.
static const char* Wt::Dbo::dbo_default_traits::surrogateIdField | ( | ) | [static] |
Returns the database field name for the surrogate primary key.
The default surrogate id database field name is "id"
.
Reimplemented in Wt::Dbo::dbo_traits< C >, Wt::Dbo::dbo_traits< AuthToken< AuthInfoType > >, Wt::Dbo::dbo_traits< UserType >, Wt::Dbo::dbo_traits< DboType >, Wt::Dbo::dbo_traits< AuthInfo< UserType > >, Wt::Dbo::dbo_traits< AuthIdentity< AuthInfoType > >, and Wt::Dbo::dbo_traits< AuthInfoType >.
static const char* Wt::Dbo::dbo_default_traits::versionField | ( | ) | [static] |
Configures the optimistic concurrency version field.
By default, optimistic concurrency locking is enabled using a "version"
field.
Reimplemented in Wt::Dbo::dbo_traits< C >, Wt::Dbo::dbo_traits< AuthToken< AuthInfoType > >, Wt::Dbo::dbo_traits< UserType >, Wt::Dbo::dbo_traits< DboType >, Wt::Dbo::dbo_traits< AuthInfo< UserType > >, Wt::Dbo::dbo_traits< AuthIdentity< AuthInfoType > >, and Wt::Dbo::dbo_traits< AuthInfoType >.