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authorRobert Haas <rhaas@postgresql.org>2016-08-23 10:30:52 -0400
committerRobert Haas <rhaas@postgresql.org>2016-08-23 10:30:52 -0400
commit86f31695f3b54211226949de519063bbf248e8c4 (patch)
tree982c2bdcb5b6453e51b1318ac54be75ecdc665c3 /src/tutorial/advanced.source
parentff36700c3ba2180047b4103de440ffaa34889b72 (diff)
downloadpostgresql-86f31695f3b54211226949de519063bbf248e8c4.tar.gz
postgresql-86f31695f3b54211226949de519063bbf248e8c4.zip
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.
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