Public Types | Static Public Member Functions

Wt::Dbo::dbo_default_traits Class Reference
[Database Objects (Dbo)]

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

#include <Wt/Dbo/Dbo>

Inheritance diagram for Wt::Dbo::dbo_default_traits:
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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.

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.


Member Typedef Documentation

Type of the primary key.

The default corresponds to a surrogate key, which is long long.

Reimplemented in Wt::Dbo::dbo_traits< C >.


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 >.

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 >.

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 >.

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