Release 10.1A: OpenEdge Development:
Programming Interfaces

Using shared record buffers with aliases

Be careful when using shared buffers with aliases. If you reference a shared buffer after changing the alias that initially was used in defining it, a run-time error results:

i-main2.p

CREATE ALIAS myalias FOR DATABASE sports1. RUN i-makebuf.p.

i-makebuf.p

DEFINE NEW SHARED BUFFER mybuf FOR myalias.customer. CREATE ALIAS myalias FOR DATABASE sports2. RUN i-disp.p

i-disp.p

DEFINE SHARED BUFFER mybuf FOR myalias.customer. FOR EACH mybuf:   DISPLAY mybuf. END.

In this example, procedure i-main2.p calls i-makebuf.p, which in turn calls i-disp.p. The alias myalias is created in main.p, with reference to database sports1. In i-makebuf.p, the shared buffer mybuf is defined for the table myalias.customer. Then, in the next line, myalias is changed, so that it now refers to database sports2. When an attempt is made to reference shared buffer mybuf in procedure i-disp.p, a run-time error occurs, with the message “i-disp.p unable to find shared buffer for mybuf.”