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Doc: improve xfunc-c-type-table. 

List types numeric and timestamptz, which don't seem to have ever been
included here.  Restore bigint, which was no-doubt-accidentally deleted
in v12.  Fix some errors, or at least obsolete usages (nobody declares
float arguments as "float8*" anymore, even though they might be that
under the hood).  Re-alphabetize.  Remove the seeming claim that this
is a complete list of built-in types.

Per question from Oskar Stenberg.

Discussion: https://postgr.es/m/HE1PR03MB2971DE2527ECE1E99D6C19A8F96E9@HE1PR03MB2971.eurprd03.prod.outlook.com
This commit is contained in:
Tom Lane 2021-12-08 16:54:31 -05:00
parent 745b99c644
commit 6f0e6ab04d
1 changed files with 32 additions and 20 deletions
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52
doc/src/sgml/xfunc.sgml
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@ -2166,16 +2166,18 @@ memcpy(destination->data, buffer, 40);
</para>
<para>
<xref linkend="xfunc-c-type-table"/> specifies which C type
corresponds to which SQL type when writing a C-language function
that uses a built-in type of <productname>PostgreSQL</productname>.
<xref linkend="xfunc-c-type-table"/> shows the C types
corresponding to many of the built-in SQL data types
of <productname>PostgreSQL</productname>.
The <quote>Defined In</quote> column gives the header file that
needs to be included to get the type definition. (The actual
definition might be in a different file that is included by the
listed file. It is recommended that users stick to the defined
interface.) Note that you should always include
<filename>postgres.h</filename> first in any source file, because
it declares a number of things that you will need anyway.
<filename>postgres.h</filename> first in any source file of server
code, because it declares a number of things that you will need
anyway, and because including other headers first can cause
portability issues.
</para>
<table tocentry="1" id="xfunc-c-type-table">
@ -2234,28 +2236,28 @@ memcpy(destination->data, buffer, 40);
<entry><filename>utils/date.h</filename></entry>
</row>
<row>
<entry><type>smallint</type> (<type>int2</type>)</entry>
<entry><type>float4</type> (<type>real</type>)</entry>
<entry><type>float4</type></entry>
<entry><filename>postgres.h</filename></entry>
</row>
<row>
<entry><type>float8</type> (<type>double precision</type>)</entry>
<entry><type>float8</type></entry>
<entry><filename>postgres.h</filename></entry>
</row>
<row>
<entry><type>int2</type> (<type>smallint</type>)</entry>
<entry><type>int16</type></entry>
<entry><filename>postgres.h</filename></entry>
</row>
<row>
<entry><type>int2vector</type></entry>
<entry><type>int2vector*</type></entry>
<entry><filename>postgres.h</filename></entry>
</row>
<row>
<entry><type>integer</type> (<type>int4</type>)</entry>
<entry><type>int4</type> (<type>integer</type>)</entry>
<entry><type>int32</type></entry>
<entry><filename>postgres.h</filename></entry>
</row>
<row>
<entry><type>real</type> (<type>float4</type>)</entry>
<entry><type>float4*</type></entry>
<entry><filename>postgres.h</filename></entry>
</row>
<row>
<entry><type>double precision</type> (<type>float8</type>)</entry>
<entry><type>float8*</type></entry>
<entry><type>int8</type> (<type>bigint</type>)</entry>
<entry><type>int64</type></entry>
<entry><filename>postgres.h</filename></entry>
</row>
<row>
@ -2273,6 +2275,11 @@ memcpy(destination->data, buffer, 40);
<entry><type>Name</type></entry>
<entry><filename>postgres.h</filename></entry>
</row>
<row>
<entry><type>numeric</type></entry>
<entry><type>Numeric</type></entry>
<entry><filename>utils/numeric.h</filename></entry>
</row>
<row>
<entry><type>oid</type></entry>
<entry><type>Oid</type></entry>
@ -2295,7 +2302,7 @@ memcpy(destination->data, buffer, 40);
</row>
<row>
<entry><type>regproc</type></entry>
<entry><type>regproc</type></entry>
<entry><type>RegProcedure</type></entry>
<entry><filename>postgres.h</filename></entry>
</row>
<row>
@ -2323,6 +2330,11 @@ memcpy(destination->data, buffer, 40);
<entry><type>Timestamp</type></entry>
<entry><filename>datatype/timestamp.h</filename></entry>
</row>
<row>
<entry><type>timestamp with time zone</type></entry>
<entry><type>TimestampTz</type></entry>
<entry><filename>datatype/timestamp.h</filename></entry>
</row>
<row>
<entry><type>varchar</type></entry>
<entry><type>VarChar*</type></entry>