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Document how to create advisory lock "bigint" values in SQL.

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David E. Wheeler
This commit is contained in:
Bruce Momjian 2012-08-27 22:36:37 -04:00
parent 7417a8e3dd
commit bf849af7f3
1 changed files with 4 additions and 1 deletions
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doc/src/sgml/catalogs.sgml
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@ -7412,7 +7412,10 @@
A <type>bigint</type> key is displayed with its
high-order half in the <structfield>classid</> column, its low-order half
in the <structfield>objid</> column, and <structfield>objsubid</> equal
to 1. Integer keys are displayed with the first key in the
to 1. The original <type>bigint</type> value can be reassembled with the
expression <literal>(classid::int::bit(64) &lt;&lt; 32 |
objid::int::bit(64))::bigint</literal>. Integer keys are displayed with the
first key in the
<structfield>classid</> column, the second key in the <structfield>objid</>
column, and <structfield>objsubid</> equal to 2. The actual meaning of
the keys is up to the user. Advisory locks are local to each database,