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Document that PL/Python now returns floats using repr() not str().

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Commit 1ce7a57ca neglected to update the user-facing documentation,
which described the old behavior precisely.
This commit is contained in:
Tom Lane 2015-09-01 19:25:58 -04:00
parent 813e08123b
commit e2e78accca
1 changed files with 14 additions and 10 deletions
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24
doc/src/sgml/plpython.sgml
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@ -288,8 +288,9 @@ $$ LANGUAGE plpythonu;
<sect2>
<title>Data Type Mapping</title>
<para>
Function arguments are converted from their PostgreSQL type to a
corresponding Python type:
When a PL/Python function is called, its arguments are converted from
their PostgreSQL data type to a corresponding Python type:
<itemizedlist>
<listitem>
<para>
@ -322,7 +323,7 @@ $$ LANGUAGE plpythonu;
Otherwise,
<literal>decimal.Decimal</literal> from the standard library will be
used. <literal>cdecimal</literal> is significantly faster
than <literal>decimal</literal>. In Python 3.3,
than <literal>decimal</literal>. In Python 3.3 and up,
however, <literal>cdecimal</literal> has been integrated into the
standard library under the name <literal>decimal</literal>, so there is
no longer any difference.
@ -356,8 +357,9 @@ $$ LANGUAGE plpythonu;
</para>
<para>
Function return values are converted to the declared PostgreSQL
return data type as follows:
When a PL/Python function returns, its return value is converted to the
function's declared PostgreSQL return data type as follows:
<itemizedlist>
<listitem>
<para>
@ -373,16 +375,18 @@ $$ LANGUAGE plpythonu;
When the PostgreSQL return type is <type>bytea</type>, the
return value will be converted to a string (Python 2) or bytes
(Python 3) using the respective Python built-ins, with the
result being converted <type>bytea</type>.
result being converted to <type>bytea</type>.
</para>
</listitem>
<listitem>
<para>
For all other PostgreSQL return types, the returned Python
value is converted to a string using the Python
built-in <literal>str</literal>, and the result is passed to the
input function of the PostgreSQL data type.
For all other PostgreSQL return types, the return value is converted
to a string using the Python built-in <literal>str</literal>, and the
result is passed to the input function of the PostgreSQL data type.
(If the Python value is a <type>float</>, it is converted using
the <literal>repr</> built-in instead of <literal>str</literal>, to
avoid loss of precision.)
</para>
<para>