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Add PL/Python functions for quoting strings

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Add functions plpy.quote_ident, plpy.quote_literal,
plpy.quote_nullable, which wrap the equivalent SQL functions.

To be able to propagate char * constness properly, make the argument
of quote_literal_cstr() const char *.  This also makes it more
consistent with quote_identifier().

Jan Urbański, reviewed by Hitoshi Harada, some refinements by Peter
Eisentraut
This commit is contained in:
Peter Eisentraut
2011-02-22 23:33:44 +02:00
parent 3e6b305d9e
commit 1c51c7d5ff
8 changed files with 179 additions and 7 deletions
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17
doc/src/sgml/plpython.sgml
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@ -997,6 +997,23 @@ $$ LANGUAGE plpythonu;
<xref linkend="guc-client-min-messages"> configuration
variables. See <xref linkend="runtime-config"> for more information.
</para>
<para>
Another set of utility functions are
<literal>plpy.quote_literal(<replaceable>string</>)</literal>,
<literal>plpy.quote_nullable(<replaceable>string</>)</literal>, and
<literal>plpy.quote_ident(<replaceable>string</>)</literal>. They
are equivalent to the built-in quoting functions described in <xref
linkend="functions-string">. They are useful when constructing
ad-hoc queries. A PL/Python equivalent of dynamic SQL from <xref
linkend="plpgsql-quote-literal-example"> would be:
<programlisting>
plpy.execute("UPDATE tbl SET %s = %s where key = %s" % (
plpy.quote_ident(colname),
plpy.quote_nullable(newvalue),
plpy.quote_literal(keyvalue)))
</programlisting>
</para>
</sect1>
<sect1 id="plpython-envar">