[4277] Added PostgreSQL HR Managment section to developer's guide

src/lib/dhcprsrv/images/pgsql_host_data_source.svg
    - New class diagram for PgSqlHostDataSource

doc/Doxyfile
    - Added src/lib/dhcprsrv/images to IMAGE_PATH

src/lib/dhcpsrv/Makefile.am
    - Added images/pgsql_host_data_source.svg to EXTRA_DIST

src/lib/dhcpsrv/libdhcpsrv.dox
    - Added subsection postgreSQLHostMgr

src/lib/dhcpsrv/pgsql_connection.h
src/lib/dhcpsrv/pgsql_exchange.h
    - Minor cleanup

1 files changed, 9 insertions, 0 deletions

diff --git a/src/lib/dhcpsrv/libdhcpsrv.dox b/src/lib/dhcpsrv/libdhcpsrv.dox
index e757c051f2..20defeb4d7 100644
--- a/src/lib/dhcpsrv/libdhcpsrv.dox
+++ b/src/lib/dhcpsrv/libdhcpsrv.dox
@@ -110,6 +110,15 @@ data source (if present) and concatenate results.
 For more information about the \ref isc::dhcp::HostMgr please refer to its
 documentation.
 
+@subsection postgreSQLHostMgr PostgreSQL Host Reservation Management
+
+Storing and retrieving host reservations within a PostgreSQL schema is
+provided by the class, \ref isc::dhcp::PgSqlHostDataSource, a derivation of
+\ref isc::dhcp::BaseHostDataSource and is depicted in the following
+class diagram:
+
+@image html pgsql_host_data_source.svg  "PgSqlHostDataSource Class Diagram"
+
 @section optionsConfig Options Configuration Information
 
 The \ref isc::dhcp::CfgOption object holds a collection of options being