[mdb-dev] [PATCH] handle no-rows case in table

[David M. <mdb...@dm...>]

Hi Brian,

It seems as though the table->num_rows variable contains junk.  It is 
always 1625 (or thereabouts) for every table in my Jet4 database.

In any case, the mdb_get_relations was seg-faulting because it was 
accessing a bogus page.  It was accessing a bogus page because the 
allocation map specifies no pages at all.  In this case, the initial 
mdb_read_next_dpg is returning 0, but the code ignores this and uses the 
data in mdb->pg_bug as if it were valid.

The attached patch fixes this, and cures the segfault (also reported on 
the list) in the mdb-schema relations section.

Apply with -p1.

David

-- 
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| David Mansfield              |
| mdb...@dm...       |
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