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doc: clarify the useful features of procedures

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This was not clearly documented when procedures were added in PG 11.

Reported-by: Robin Abbi

Discussion: https://postgr.es/m/CAGmg_NX327KKVuJmbWZD=pGutYFxzZjX1rU+3ji8UuX=8ONn9Q@mail.gmail.com

Backpatch-through: 11
This commit is contained in:
Bruce Momjian 2020-08-31 13:20:04 -04:00
parent 3a1f6a2581
commit 785affc1d6
1 changed files with 5 additions and 2 deletions
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doc/src/sgml/xfunc.sgml
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@ -84,8 +84,11 @@
A procedure is a database object similar to a function. The difference is A procedure is a database object similar to a function. The difference is
that a procedure does not return a value, so there is no return type that a procedure does not return a value, so there is no return type
declaration. While a function is called as part of a query or DML declaration. While a function is called as part of a query or DML
command, a procedure is called explicitly using command, a procedure is called in isolation using
the <xref linkend="sql-call"/> statement. the <xref linkend="sql-call"/> command. If the CALL command is not
part of an explicit transaction, a procedure in many server-side
languages can commit, rollback, and begin new transactions during
its execution, which is not possible in functions.
</para> </para>
<para> <para>