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Add txid_current_ifassigned().

author Robert Haas <rhaas@postgresql.org>

2016年8月23日 14:30:52 +0000 (10:30 -0400)

committer Robert Haas <rhaas@postgresql.org>

2016年8月23日 14:30:52 +0000 (10:30 -0400)

commit 86f31695f3b54211226949de519063bbf248e8c4

tree 982c2bdcb5b6453e51b1318ac54be75ecdc665c3 tree

parent ff36700c3ba2180047b4103de440ffaa34889b72 commit | diff

Add txid_current_ifassigned().

Add a variant of txid_current() that returns NULL if no transaction ID
is assigned. This version can be used even on a standby server,
although it will always return NULL since no transaction IDs can be
assigned during recovery.

Craig Ringer, per suggestion from Jim Nasby. Reviewed by Petr Jelinek
and by me.

doc/src/sgml/func.sgml diff | blob | blame | history

src/backend/utils/adt/txid.c diff | blob | blame | history

src/include/catalog/pg_proc.h diff | blob | blame | history

src/include/utils/builtins.h diff | blob | blame | history

src/test/regress/expected/txid.out diff | blob | blame | history

src/test/regress/sql/txid.sql diff | blob | blame | history

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