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Commit 9048b73

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Implement the DO statement to support execution of PL code without having
to create a function for it. Procedural languages now have an additional entry point, namely a function to execute an inline code block. This seemed a better design than trying to hide the transient-ness of the code from the PL. As of this patch, only plpgsql has an inline handler, but probably people will soon write handlers for the other standard PLs. In passing, remove the long-dead LANCOMPILER option of CREATE LANGUAGE. Petr Jelinek
1 parent d5a43ff commit 9048b73

34 files changed

+970
-140
lines changed

‎doc/src/sgml/catalogs.sgml

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<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.206 2009/08/10 22:13:50 alvherre Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.207 2009/09/22 23:43:37 tgl Exp $ -->
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<!--
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Documentation of the system catalogs, directed toward PostgreSQL developers
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-->
@@ -2941,6 +2941,18 @@
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</entry>
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</row>
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<row>
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<entry><structfield>laninline</structfield></entry>
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<entry><type>oid</type></entry>
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<entry><literal><link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.oid</literal></entry>
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<entry>
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This references a function that is responsible for executing
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<quote>inline</> anonymous code blocks
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(<xref linkend="sql-do" endterm="sql-do-title"> blocks).
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Zero if inline blocks are not supported
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</entry>
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</row>
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<row>
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<entry><structfield>lanvalidator</structfield></entry>
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<entry><type>oid</type></entry>
@@ -3547,6 +3559,12 @@
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<entry>Name of call handler function</entry>
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</row>
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<row>
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<entry><structfield>tmplinline</structfield></entry>
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<entry><type>text</type></entry>
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<entry>Name of anonymous-block handler function, or NULL if none</entry>
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</row>
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<row>
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<entry><structfield>tmplvalidator</structfield></entry>
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<entry><type>text</type></entry>

‎doc/src/sgml/config.sgml

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<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.228 2009/09/13 19:52:29 petere Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.229 2009/09/22 23:43:37 tgl Exp $ -->
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<chapter Id="runtime-config">
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<title>Server Configuration</title>
@@ -3964,6 +3964,21 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
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</listitem>
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</varlistentry>
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<varlistentry id="guc-default-do-language" xreflabel="default_do_language">
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<term><varname>default_do_language</varname> (<type>string</type>)</term>
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<indexterm>
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<primary><varname>default_do_language</> configuration parameter</primary>
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</indexterm>
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<listitem>
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<para>
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This parameter specifies the language to use when the
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<literal>LANGUAGE</> option is omitted in a
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<xref linkend="sql-do" endterm="sql-do-title"> statement.
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The default is <literal>plpgsql</literal>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="guc-default-transaction-isolation" xreflabel="default_transaction_isolation">
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<indexterm>
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<primary>transaction isolation level</primary>

‎doc/src/sgml/keywords.sgml

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<!-- $PostgreSQL: pgsql/doc/src/sgml/keywords.sgml,v 2.25 2009/04/06 15:01:36 tgl Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/keywords.sgml,v 2.26 2009/09/22 23:43:37 tgl Exp $ -->
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<appendix id="sql-keywords-appendix">
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<title><acronym>SQL</acronym> Key Words</title>
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<entry>reserved</entry>
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<entry>reserved</entry>
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</row>
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<row>
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<entry><token>INLINE</token></entry>
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<entry>non-reserved</entry>
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<entry></entry>
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<entry></entry>
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<entry></entry>
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<entry></entry>
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</row>
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<row>
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<entry><token>INNER</token></entry>
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<entry>reserved (can be function or type)</entry>
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<entry></entry>
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<entry></entry>
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</row>
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<row>
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<entry><token>LANCOMPILER</token></entry>
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<entry>non-reserved</entry>
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<entry></entry>
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<entry></entry>
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<entry></entry>
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<entry></entry>
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</row>
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<row>
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<entry><token>LANGUAGE</token></entry>
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<entry>non-reserved</entry>

‎doc/src/sgml/ref/allfiles.sgml

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<!--
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$PostgreSQL: pgsql/doc/src/sgml/ref/allfiles.sgml,v 1.74 2008/12/19 16:25:16 petere Exp $
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$PostgreSQL: pgsql/doc/src/sgml/ref/allfiles.sgml,v 1.75 2009/09/22 23:43:37 tgl Exp $
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PostgreSQL documentation
44
Complete list of usable sgml source files in this directory.
55
-->
@@ -77,6 +77,7 @@ Complete list of usable sgml source files in this directory.
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<!entity declare system "declare.sgml">
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<!entity delete system "delete.sgml">
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<!entity discard system "discard.sgml">
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<!entity do system "do.sgml">
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<!entity dropAggregate system "drop_aggregate.sgml">
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<!entity dropCast system "drop_cast.sgml">
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<!entity dropConversion system "drop_conversion.sgml">

‎doc/src/sgml/ref/create_language.sgml

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<!--
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$PostgreSQL: pgsql/doc/src/sgml/ref/create_language.sgml,v 1.45 2008/11/14 10:22:46 petere Exp $
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$PostgreSQL: pgsql/doc/src/sgml/ref/create_language.sgml,v 1.46 2009/09/22 23:43:37 tgl Exp $
33
PostgreSQL documentation
44
-->
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@@ -23,7 +23,7 @@ PostgreSQL documentation
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<synopsis>
2424
CREATE [ PROCEDURAL ] LANGUAGE <replaceable class="parameter">name</replaceable>
2525
CREATE [ TRUSTED ] [ PROCEDURAL ] LANGUAGE <replaceable class="parameter">name</replaceable>
26-
HANDLER <replaceable class="parameter">call_handler</replaceable> [ VALIDATOR <replaceable>valfunction</replaceable> ]
26+
HANDLER <replaceable class="parameter">call_handler</replaceable> [ INLINE <replaceable class="parameter">inline_handler</replaceable> ] [ VALIDATOR <replaceable>valfunction</replaceable> ]
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</synopsis>
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</refsynopsisdiv>
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@@ -133,7 +133,7 @@ CREATE [ TRUSTED ] [ PROCEDURAL ] LANGUAGE <replaceable class="parameter">name</
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<para>
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<replaceable class="parameter">call_handler</replaceable> is
135135
the name of a previously registered function that will be
136-
called to execute the procedural language functions. The call
136+
called to execute the procedural language's functions. The call
137137
handler for a procedural language must be written in a compiled
138138
language such as C with version 1 call convention and
139139
registered with <productname>PostgreSQL</productname> as a
@@ -144,6 +144,27 @@ CREATE [ TRUSTED ] [ PROCEDURAL ] LANGUAGE <replaceable class="parameter">name</
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</listitem>
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</varlistentry>
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147+
<varlistentry>
148+
<term><literal>INLINE</literal> <replaceable class="parameter">inline_handler</replaceable></term>
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<listitem>
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<para>
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<replaceable class="parameter">inline_handler</replaceable> is the
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name of a previously registered function that will be called
154+
to execute an anonymous code block
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(<xref linkend="sql-do" endterm="sql-do-title"> command)
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in this language.
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If no <replaceable class="parameter">inline_handler</replaceable>
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function is specified, the language does not support anonymous code
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blocks.
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The handler function must take one argument of
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type <type>internal</type>, which will be the <command>DO</> command's
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internal representation, and it will typically return
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<type>void</>. The return value of the handler is ignored.
164+
</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>VALIDATOR</literal> <replaceable class="parameter">valfunction</replaceable></term>
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@@ -216,7 +237,8 @@ CREATE [ TRUSTED ] [ PROCEDURAL ] LANGUAGE <replaceable class="parameter">name</
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</para>
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<para>
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The call handler function and the validator function (if any)
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The call handler function, the inline handler function (if any),
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and the validator function (if any)
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must already exist if the server does not have an entry for the language
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in <structname>pg_pltemplate</>. But when there is an entry,
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the functions need not already exist;
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In <productname>PostgreSQL</productname> versions before 7.3, it was
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necessary to declare handler functions as returning the placeholder
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type <type>opaque</>, rather than <type>language_handler</>.
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To support loading
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To support loading
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of old dump files, <command>CREATE LANGUAGE</> will accept a function
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declared as returning <type>opaque</>, but it will issue a notice and
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change the function's declared return type to <type>language_handler</>.

‎doc/src/sgml/ref/do.sgml

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<!--
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$PostgreSQL: pgsql/doc/src/sgml/ref/do.sgml,v 1.1 2009/09/22 23:43:37 tgl Exp $
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PostgreSQL documentation
4+
-->
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6+
<refentry id="SQL-DO">
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<refmeta>
8+
<refentrytitle id="sql-do-title">DO</refentrytitle>
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<manvolnum>7</manvolnum>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
14+
<refname>DO</refname>
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<refpurpose>execute an anonymous code block</refpurpose>
16+
</refnamediv>
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18+
<indexterm zone="sql-do">
19+
<primary>DO</primary>
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</indexterm>
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22+
<indexterm zone="sql-do">
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<primary>anonymous code blocks</primary>
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</indexterm>
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<refsynopsisdiv>
27+
<synopsis>
28+
DO <replaceable class="PARAMETER">code</replaceable> [ LANGUAGE <replaceable class="PARAMETER">lang_name</replaceable> ]
29+
</synopsis>
30+
</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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35+
<para>
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<command>DO</command> executes an anonymous code block, or in other
37+
words a transient anonymous function in a procedural language.
38+
</para>
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<para>
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The code block is treated as though it were the body of a function
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with no parameters, returning <type>void</>. It is parsed and
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executed a single time.
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</para>
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</refsect1>
46+
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<refsect1>
48+
<title>Parameters</title>
49+
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<variablelist>
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<varlistentry>
52+
<term><replaceable class="PARAMETER">code</replaceable></term>
53+
<listitem>
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<para>
55+
The procedural language code to be executed. This must be specified
56+
as a string literal, just as in <command>CREATE FUNCTION</>.
57+
Use of a dollar-quoted literal is recommended.
58+
</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="PARAMETER">lang_name</replaceable></term>
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<listitem>
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<para>
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The name of the procedural language the code is written in.
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If omitted, the default is determined by the runtime parameter
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<xref linkend="guc-default-do-language">.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>
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The procedural language to be used must already have been installed
80+
into the current database by means of <command>CREATE LANGUAGE</>.
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</para>
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<para>
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The user must have <literal>USAGE</> privilege for the procedural
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language, or must be a superuser if the language is untrusted.
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This is the same privilege requirement as for creating a function
87+
in the language.
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</para>
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</refsect1>
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<refsect1 id="sql-do-examples">
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<title id="sql-do-examples-title">Examples</title>
93+
<para>
94+
Execute a simple PL/pgsql loop without needing to create a function:
95+
<programlisting>
96+
DO $$
97+
DECLARE r record;
98+
BEGIN
99+
FOR r IN SELECT rtrim(roomno) AS roomno, comment FROM Room ORDER BY roomno
100+
LOOP
101+
RAISE NOTICE '%, %', r.roomno, r.comment;
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END LOOP;
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END$$;
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</programlisting>
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</para>
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</refsect1>
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<refsect1>
108+
<title>Compatibility</title>
109+
110+
<para>
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There is no <command>DO</command> statement in the SQL standard.
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
117+
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<simplelist type="inline">
119+
<member><xref linkend="sql-createlanguage" endterm="sql-createlanguage-title"></member>
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</simplelist>
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</refsect1>
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</refentry>

‎doc/src/sgml/reference.sgml

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<!-- $PostgreSQL: pgsql/doc/src/sgml/reference.sgml,v 1.67 2008/12/19 16:25:16 petere Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/reference.sgml,v 1.68 2009/09/22 23:43:37 tgl Exp $ -->
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<part id="reference">
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<title>Reference</title>
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&declare;
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&delete;
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&discard;
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&do;
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&dropAggregate;
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&dropCast;
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&dropConversion;

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