Mapped Cache Extensions and the Application Database
The fields of a mapped cache extension that are mapped to the fields of a base data access
class (DAC) are used by the system to work with the database columns to which the fields of the
base DAC are bound.
If a mapped cache extension includes fields that are bound to database columns (with the type
attributes that are derived from the PXDBFieldAttribute class, such as
PXDBString), the database table that corresponds to the base DAC must contain
these fields of the mapped cache extension. That is, the database table must include the fields
bound to a database column that are defined both in the base DAC and the mapped cache extension,
as shown in the following diagram.Figure 1. Database schema for a DAC and mapped cache extension
