  Neumann boundary condition plays an important role in the initial proposal of
holographic dual of boundary conformal field theory, which has yield many
interesting results and passed several non-trivial tests. In this paper, we
show that Dirichlet boundary condition works as well as Neumann boundary
condition. For instance, it includes AdS solution and obeys the g-theorem.
Furthermore, it can produce the correct expression of one point function, the
boundary Weyl anomaly and the universal relations between them. We also study
the relative boundary condition for gauge fields, which is the counterpart of
Dirichlet boundary condition for gravitational fields. Interestingly, the
four-dimensional Reissner-Nordstrom black hole with magnetic charge is an exact
solution to relative boundary condition under some conditions. This holographic
model predicts that a constant magnetic field in the bulk can induce a constant
current on the boundary in three dimensions. We suggest to measure this
interesting boundary current in materials such as the graphene.
