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Add pg_get_serial_sequence() function, and cause pg_dump to use it.

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This eliminates the assumption that a serial column's sequence will
have the same name on reload that it was given in the original database.

Christopher Kings-Lynne
This commit is contained in:
Tom Lane
2004-06-25 17:20:29 +00:00
parent ef2880263c
commit a0e842d81b
6 changed files with 185 additions and 29 deletions
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65
doc/src/sgml/func.sgml
View File

@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.210 2004/06/24 19:57:14 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.211 2004/06/25 17:20:21 tgl Exp $
PostgreSQL documentation
-->
@ -7228,29 +7228,13 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
<primary>pg_get_userbyid</primary>
</indexterm>
<indexterm zone="functions-misc">
<primary>pg_get_serial_sequence</primary>
</indexterm>
<para>
<xref linkend="functions-misc-catalog-table"> lists functions that
extract information from the system catalogs.
<function>pg_get_viewdef</function>,
<function>pg_get_ruledef</function>,
<function>pg_get_indexdef</function>,
<function>pg_get_triggerdef</function>, and
<function>pg_get_constraintdef</function> respectively
reconstruct the creating command for a view, rule, index, trigger, or
constraint. (Note that this is a decompiled reconstruction, not
the original text of the command.) Most of these come in two
variants, one of which can optionally <quote>pretty-print</> the result.
The pretty-printed format is more readable, but the default format is more
likely to be
interpreted the same way by future versions of <productname>PostgreSQL</>;
avoid using pretty-printed output for dump purposes.
Passing <literal>false</> for the pretty-print parameter yields the
same result as the variant that does not have the parameter at all.
<function>pg_get_expr</function> decompiles the internal form of an
individual expression, such as the default value for a column. It
may be useful when examining the contents of system catalogs.
<function>pg_get_userbyid</function>
extracts a user's name given a user ID number.
</para>
<table id="functions-misc-catalog-table">
@ -7335,10 +7319,49 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
<entry><type>name</type></entry>
<entry>get user name with given ID</entry>
</row>
<row>
<entry><literal><function>pg_get_serial_sequence</function>(<parameter>table_name</parameter>, <parameter>column_name</parameter>)</literal></entry>
<entry><type>text</type></entry>
<entry>get name of the sequence that a serial or bigserial column
uses</entry>
</row>
</tbody>
</tgroup>
</table>
<para>
<function>pg_get_viewdef</function>,
<function>pg_get_ruledef</function>,
<function>pg_get_indexdef</function>,
<function>pg_get_triggerdef</function>, and
<function>pg_get_constraintdef</function> respectively
reconstruct the creating command for a view, rule, index, trigger, or
constraint. (Note that this is a decompiled reconstruction, not
the original text of the command.)
<function>pg_get_expr</function> decompiles the internal form of an
individual expression, such as the default value for a column. It
may be useful when examining the contents of system catalogs.
Most of these functions come in two
variants, one of which can optionally <quote>pretty-print</> the result.
The pretty-printed format is more readable, but the default format is more
likely to be
interpreted the same way by future versions of <productname>PostgreSQL</>;
avoid using pretty-printed output for dump purposes.
Passing <literal>false</> for the pretty-print parameter yields the
same result as the variant that does not have the parameter at all.
</para>
<para>
<function>pg_get_userbyid</function>
extracts a user's name given a user ID number.
<function>pg_get_serial_sequence</function>
fetches the name of the sequence associated with a serial or
bigserial column. The name is suitably formatted
for passing to the sequence functions (see <xref
linkend="functions-sequence">).
NULL is returned if the column does not have a sequence attached.
</para>
<indexterm zone="functions-misc">
<primary>obj_description</primary>
</indexterm>