~ubuntu-branches/ubuntu/trusty/postgresql-9.3/trusty-updates : contents of doc/src/sgml/html/sql-do.html at revision 27

~ubuntu-branches/ubuntu/trusty/postgresql-9.3/trusty-updates : (revision 27)
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>DO</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN75653"
></A
><H2
>Name</H2
>DO&nbsp;--&nbsp;execute an anonymous code block</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN75660"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>DO [ LANGUAGE <TT
CLASS="REPLACEABLE"
><I
>lang_name</I
></TT
> ] <TT
CLASS="REPLACEABLE"
><I
>code</I
></TT
></PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN75664"
></A
><H2
>Description</H2
><P
>   <TT
CLASS="COMMAND"
>DO</TT
> executes an anonymous code block, or in other
   words a transient anonymous function in a procedural language.
  </P
><P
>   The code block is treated as though it were the body of a function
   with no parameters, returning <TT
CLASS="TYPE"
>void</TT
>.  It is parsed and
   executed a single time.
  </P
><P
>   The optional <TT
CLASS="LITERAL"
>LANGUAGE</TT
> clause can be written either
   before or after the code block.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN75672"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>code</I
></TT
></DT
><DD
><P
>      The procedural language code to be executed.  This must be specified
      as a string literal, just as in <TT
CLASS="COMMAND"
>CREATE FUNCTION</TT
>.
      Use of a dollar-quoted literal is recommended.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>lang_name</I
></TT
></DT
><DD
><P
>      The name of the procedural language the code is written in.
      If omitted, the default is <TT
CLASS="LITERAL"
>plpgsql</TT
>.
     </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN75687"
></A
><H2
>Notes</H2
><P
>   The procedural language to be used must already have been installed
   into the current database by means of <TT
CLASS="COMMAND"
>CREATE LANGUAGE</TT
>.
   <TT
CLASS="LITERAL"
>plpgsql</TT
> is installed by default, but other languages are not.
  </P
><P
>   The user must have <TT
CLASS="LITERAL"
>USAGE</TT
> privilege for the procedural
   language, or must be a superuser if the language is untrusted.
   This is the same privilege requirement as for creating a function
   in the language.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="SQL-DO-EXAMPLES"
></A
><H2
>Examples</H2
><P
>   Grant all privileges on all views in schema <TT
CLASS="LITERAL"
>public</TT
> to
   role <TT
CLASS="LITERAL"
>webuser</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>DO $$DECLARE r record;
BEGIN
    FOR r IN SELECT table_schema, table_name FROM information_schema.tables
             WHERE table_type = 'VIEW' AND table_schema = 'public'
    LOOP
        EXECUTE 'GRANT ALL ON ' || quote_ident(r.table_schema) || '.' || quote_ident(r.table_name) || ' TO webuser';
    END LOOP;
END$$;</PRE
><P></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN75700"
></A
><H2
>Compatibility</H2
><P
>   There is no <TT
CLASS="COMMAND"
>DO</TT
> statement in the SQL standard.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN75704"
></A
><H2
>See Also</H2
><A
HREF="sql-createlanguage.html"
>CREATE LANGUAGE</A
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