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Pipeline mode disallows multicommand strings

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... so mention that in appropriate places of the libpq docs.

Backpatch to 14.

Reported-by: RekGRpth <rekgrpth@gmail.com>
Discussion: https://postgr.es/m/17235-53bb38fc5be593dc@postgresql.org
This commit is contained in:
Alvaro Herrera 2021-11-05 11:40:03 -03:00
parent e543906e21
commit 105c1de019
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1 changed files with 7 additions and 1 deletions
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doc/src/sgml/libpq.sgml
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@ -4594,6 +4594,11 @@ int PQsendQuery(PGconn *conn, const char *command);
(on the same connection) until <xref linkend="libpq-PQgetResult"/> (on the same connection) until <xref linkend="libpq-PQgetResult"/>
has returned a null pointer, indicating that the command is done. has returned a null pointer, indicating that the command is done.
</para> </para>
<para>
In pipeline mode, command strings containing more than one SQL command
are disallowed.
</para>
</listitem> </listitem>
</varlistentry> </varlistentry>
@ -5046,7 +5051,8 @@ int PQflush(PGconn *conn);
<xref linkend="libpq-PQpipelineStatus"/> can be used <xref linkend="libpq-PQpipelineStatus"/> can be used
to test whether pipeline mode is active. to test whether pipeline mode is active.
In pipeline mode, only <link linkend="libpq-async">asynchronous operations</link> In pipeline mode, only <link linkend="libpq-async">asynchronous operations</link>
are permitted, and <literal>COPY</literal> is disallowed. are permitted, command strings containing multiple SQL commands are
disallowed, and so is <literal>COPY</literal>.
Using synchronous command execution functions Using synchronous command execution functions
such as <function>PQfn</function>, such as <function>PQfn</function>,
<function>PQexec</function>, <function>PQexec</function>,