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Add pretty-printing variants of pg_get_viewdef and related functions.

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Patch from Andreas Pflug.
This commit is contained in:
Tom Lane 2003-07-30 22:56:24 +00:00
parent 12911ea2e1
commit 52347b6637
5 changed files with 950 additions and 192 deletions
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63
doc/src/sgml/func.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.161 2003/07/29 00:03:17 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.162 2003/07/30 22:56:23 tgl Exp $
PostgreSQL documentation
-->
@ -6494,10 +6494,9 @@ SET search_path TO <replaceable>schema</> <optional>, <replaceable>schema</>, ..
<para>
The function <function>current_setting</function> yields the
current value of the setting <parameter>setting_name</parameter>,
as part of a query result. It corresponds to the
<acronym>SQL</acronym> command <command>SHOW</command>. An
example:
current value of the setting <parameter>setting_name</parameter>.
It corresponds to the <acronym>SQL</acronym> command
<command>SHOW</command>. An example:
<programlisting>
SELECT current_setting('datestyle');
@ -6832,6 +6831,10 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
<primary>pg_get_constraintdef</primary>
</indexterm>
<indexterm zone="functions-misc">
<primary>pg_get_expr</primary>
</indexterm>
<indexterm zone="functions-misc">
<primary>pg_get_userbyid</primary>
</indexterm>
@ -6846,7 +6849,16 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
<function>pg_get_constraintdef</function> respectively
reconstruct the creating command for a view, rule, index, or
constraint. (Note that this is a decompiled reconstruction, not
the verbatim text of the command.)
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 form is more readable but is less 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>
@ -6864,21 +6876,43 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
<entry><type>text</type></entry>
<entry>get <command>CREATE VIEW</> command for view (<emphasis>deprecated</emphasis>)</entry>
</row>
<row>
<entry><literal><function>pg_get_viewdef</function>(<parameter>view_name</parameter>, <parameter>pretty_bool</>)</literal></entry>
<entry><type>text</type></entry>
<entry>get <command>CREATE VIEW</> command for view (<emphasis>deprecated</emphasis>)</entry>
</row>
<row>
<entry><literal><function>pg_get_viewdef</function>(<parameter>view_oid</parameter>)</literal></entry>
<entry><type>text</type></entry>
<entry>get <command>CREATE VIEW</> command for view</entry>
</row>
<row>
<entry><literal><function>pg_get_viewdef</function>(<parameter>view_oid</parameter>, <parameter>pretty_bool</>)</literal></entry>
<entry><type>text</type></entry>
<entry>get <command>CREATE VIEW</> command for view</entry>
</row>
<row>
<entry><literal><function>pg_get_ruledef</function>(<parameter>rule_oid</parameter>)</literal></entry>
<entry><type>text</type></entry>
<entry>get <command>CREATE RULE</> command for rule</entry>
</row>
<row>
<entry><literal><function>pg_get_ruledef</function>(<parameter>rule_oid</parameter>, <parameter>pretty_bool</>)</literal></entry>
<entry><type>text</type></entry>
<entry>get <command>CREATE RULE</> command for rule</entry>
</row>
<row>
<entry><literal><function>pg_get_indexdef</function>(<parameter>index_oid</parameter>)</literal></entry>
<entry><type>text</type></entry>
<entry>get <command>CREATE INDEX</> command for index</entry>
</row>
<row>
<entry><literal><function>pg_get_indexdef</function>(<parameter>index_oid</parameter>, <parameter>column_no</>, <parameter>pretty_bool</>)</literal></entry>
<entry><type>text</type></entry>
<entry>get <command>CREATE INDEX</> command for index,
or definition of just one index column when
<parameter>column_no</> is not zero</entry>
</row>
<row>
<entry><function>pg_get_triggerdef</function>(<parameter>trigger_oid</parameter>)</entry>
<entry><type>text</type></entry>
@ -6889,6 +6923,23 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
<entry><type>text</type></entry>
<entry>get definition of a constraint</entry>
</row>
<row>
<entry><literal><function>pg_get_constraintdef</function>(<parameter>constraint_oid</parameter>, <parameter>pretty_bool</>)</literal></entry>
<entry><type>text</type></entry>
<entry>get definition of a constraint</entry>
</row>
<row>
<entry><literal><function>pg_get_expr</function>(<parameter>expr_text</parameter>, <parameter>relation_oid</>)</literal></entry>
<entry><type>text</type></entry>
<entry>decompile internal form of an expression, assuming that any Vars
in it refer to the relation indicated by the second parameter</entry>
</row>
<row>
<entry><literal><function>pg_get_expr</function>(<parameter>expr_text</parameter>, <parameter>relation_oid</>, <parameter>pretty_bool</>)</literal></entry>
<entry><type>text</type></entry>
<entry>decompile internal form of an expression, assuming that any Vars
in it refer to the relation indicated by the second parameter</entry>
</row>
<row>
<entry><literal><function>pg_get_userbyid</function>(<parameter>userid</parameter>)</literal></entry>
<entry><type>name</type></entry>

901
src/backend/utils/adt/ruleutils.c
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4
src/include/catalog/catversion.h
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@ -37,7 +37,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: catversion.h,v 1.203 2003/07/29 17:21:27 tgl Exp $
* $Id: catversion.h,v 1.204 2003/07/30 22:56:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -53,6 +53,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 200307291
#define CATALOG_VERSION_NO 200307301
#endif

16
src/include/catalog/pg_proc.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: pg_proc.h,v 1.309 2003/07/01 00:04:38 tgl Exp $
* $Id: pg_proc.h,v 1.310 2003/07/30 22:56:24 tgl Exp $
*
* NOTES
* The script catalog/genbki.sh reads this file and generates .bki
@ -3405,6 +3405,20 @@ DESCR("I/O");
DATA(insert OID = 2503 ( anyarray_send PGNSP PGUID 12 f f t f s 1 17 "2277" anyarray_send - _null_ ));
DESCR("I/O");
/* System-view support functions with pretty-print option */
DATA(insert OID = 2504 ( pg_get_ruledef PGNSP PGUID 12 f f t f s 2 25 "26 16" pg_get_ruledef_ext - _null_ ));
DESCR("source text of a rule with pretty-print option");
DATA(insert OID = 2505 ( pg_get_viewdef PGNSP PGUID 12 f f t f s 2 25 "25 16" pg_get_viewdef_name_ext - _null_ ));
DESCR("select statement of a view with pretty-print option");
DATA(insert OID = 2506 ( pg_get_viewdef PGNSP PGUID 12 f f t f s 2 25 "26 16" pg_get_viewdef_ext - _null_ ));
DESCR("select statement of a view with pretty-print option");
DATA(insert OID = 2507 ( pg_get_indexdef PGNSP PGUID 12 f f t f s 3 25 "26 23 16" pg_get_indexdef_ext - _null_ ));
DESCR("index description (full create statement or single expression) with pretty-print option");
DATA(insert OID = 2508 ( pg_get_constraintdef PGNSP PGUID 12 f f t f s 2 25 "26 16" pg_get_constraintdef_ext - _null_ ));
DESCR("constraint description with pretty-print option");
DATA(insert OID = 2509 ( pg_get_expr PGNSP PGUID 12 f f t f s 3 25 "25 26 16" pg_get_expr_ext - _null_ ));
DESCR("deparse an encoded expression with pretty-print option");
/*
* Symbolic values for provolatile column: these indicate whether the result

8
src/include/utils/builtins.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: builtins.h,v 1.223 2003/06/27 00:33:26 tgl Exp $
* $Id: builtins.h,v 1.224 2003/07/30 22:56:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -441,13 +441,19 @@ extern char *format_operator(Oid operator_oid);
/* ruleutils.c */
extern Datum pg_get_ruledef(PG_FUNCTION_ARGS);
extern Datum pg_get_ruledef_ext(PG_FUNCTION_ARGS);
extern Datum pg_get_viewdef(PG_FUNCTION_ARGS);
extern Datum pg_get_viewdef_ext(PG_FUNCTION_ARGS);
extern Datum pg_get_viewdef_name(PG_FUNCTION_ARGS);
extern Datum pg_get_viewdef_name_ext(PG_FUNCTION_ARGS);
extern Datum pg_get_indexdef(PG_FUNCTION_ARGS);
extern Datum pg_get_indexdef_ext(PG_FUNCTION_ARGS);
extern Datum pg_get_triggerdef(PG_FUNCTION_ARGS);
extern Datum pg_get_constraintdef(PG_FUNCTION_ARGS);
extern Datum pg_get_constraintdef_ext(PG_FUNCTION_ARGS);
extern Datum pg_get_userbyid(PG_FUNCTION_ARGS);
extern Datum pg_get_expr(PG_FUNCTION_ARGS);
extern Datum pg_get_expr_ext(PG_FUNCTION_ARGS);
extern char *deparse_expression(Node *expr, List *dpcontext,
bool forceprefix, bool showimplicit);
extern List *deparse_context_for(const char *aliasname, Oid relid);