Wt::Dbo::dbo_default_traits Class Reference

Default traits for a class mapped with Wt::Dbo. More...

#include <Wt/Dbo/Dbo>

Inheritance diagram for Wt::Dbo::dbo_default_traits:

List of all members.

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.

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Detailed Description

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.

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Member Typedef Documentation

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< AuthInfo< UserType > >, Wt::Dbo::dbo_traits< AuthIdentity< AuthInfoType > >, and Wt::Dbo::dbo_traits< MutC >.

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Member Function Documentation

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< AuthInfo< UserType > >, Wt::Dbo::dbo_traits< AuthIdentity< AuthInfoType > >, and Wt::Dbo::dbo_traits< MutC >.

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< AuthInfo< UserType > >, Wt::Dbo::dbo_traits< AuthIdentity< AuthInfoType > >, and Wt::Dbo::dbo_traits< MutC >.

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< AuthInfo< UserType > >, Wt::Dbo::dbo_traits< AuthIdentity< AuthInfoType > >, and Wt::Dbo::dbo_traits< MutC >.