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pgsql - PostgreSQL support
On hosts with the PostgreSQL package installed, the driver can be
configured to interface with the PostgreSQL database. If that is done,
the driver defines the macro __PGSQL__ for LPC programs and
activates a number of related efuns.
-- Usage --
The interface to the PostgreSQL database is implemented
through the concept of a controlling object: when opening a
database connection, the LPC code has to provide a callback
function. The object this function is bound to is the
controlling object: all queries to the database will be issued
by this object, and the responses will be sent to the callback
The interface is also asynchronous: the pg_query() efun just
queues the query with the database connection, and returns
immediately. When the database has finished working the query,
the callback function is called with the results.
The callback function can be defined by name or by closure,
and can be defined with extra parameters:
#include <pgsql.h>
void <callback>(int type, mixed ret, int id [, mixed extra...])
<type> is the type of the call, <id> identifies the query
for which this call is executed:
PGRES_TUPLES_OK: <ret> is the result from a query.
It is either a mapping (field name as
key, indexing <n> values for n returned
tuples), or an array of arrays (one per
PGRES_COMMAND_OK: <ret> is a string which contains the
server response (e.g. on INSERT or DELETE)
PGRES_FATAL_ERROR: ret is the error-string
void <callback>(int type, mixed ret [, mixed extra...])
<type> is the type of the call, which is not related to a
specific query:
PGCONN_SUCCESS: The database-connection was established,
<ret> is a dummy string.
PGCONN_FAILED: The database-connection failed, <ret> is
the error message.
The first message to the callback after a call to
pg_connect() is always one of these two.
PGRES_NOTICE: <ret> is a informational text.
PGCONN_ABORTED: If the connection to the backend fails
we try to re-establish (reset) it. If the
reset fails, the connection is closed and
this value is returned. Consider the
connection gone and don't try to close or
otherwise operate further on it.
<ret> is a dummy string.
-- Security --
All SQL efuns (unless execute by the master or the simul-efun object)
trigger a privilege_violation ("pgsql", "<efun_name>"). If a more
finegrained control is desired, overload the individual efuns with a
nomask simul-efun.
Florian Heinz and others.
Added as package in LDMud 3.3.445.
LDMud 3.3.640 added a privilege_violation() call for each efun.
mysql(C), pg_connect(E), pg_conv_string(E), pg_query(E), pg_pending(E),
pg_close(E), privilege_violation(M)