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Information schema views for collation support

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Add the views character_sets, collations, and
collation_character_set_applicability.
This commit is contained in:
Peter Eisentraut
2011-02-09 23:26:48 +02:00
parent 183d3cff85
commit 2e2d56fea9
3 changed files with 292 additions and 4 deletions
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43
src/backend/catalog/information_schema.sql
View File

@ -354,7 +354,23 @@ GRANT SELECT ON attributes TO PUBLIC;
* CHARACTER_SETS view
*/
-- feature not supported
CREATE VIEW character_sets AS
SELECT CAST(null AS sql_identifier) AS character_set_catalog,
CAST(null AS sql_identifier) AS character_set_schema,
CAST(getdatabaseencoding() AS sql_identifier) AS character_set_name,
CAST(CASE WHEN getdatabaseencoding() = 'UTF8' THEN 'UCS' ELSE getdatabaseencoding() END AS sql_identifier) AS character_repertoire,
CAST(getdatabaseencoding() AS sql_identifier) AS form_of_use,
CAST(current_database() AS sql_identifier) AS default_collate_catalog,
CAST(nc.nspname AS sql_identifier) AS default_collate_schema,
CAST(c.collname AS sql_identifier) AS default_collate_name
FROM pg_database d
LEFT JOIN (pg_collation c JOIN pg_namespace nc ON (c.collnamespace = nc.oid))
ON (datcollate = collcollate AND datctype = collctype)
WHERE d.datname = current_database()
ORDER BY char_length(c.collname) DESC, c.collname ASC -- prefer full/canonical name
LIMIT 1;
GRANT SELECT ON character_sets TO PUBLIC;
/*
@ -425,14 +441,35 @@ GRANT SELECT ON check_constraints TO PUBLIC;
* COLLATIONS view
*/
-- feature not supported
CREATE VIEW collations AS
SELECT CAST(current_database() AS sql_identifier) AS collation_catalog,
CAST(nc.nspname AS sql_identifier) AS collation_schema,
CAST(c.collname AS sql_identifier) AS collation_name,
CAST('NO PAD' AS character_data) AS pad_attribute
FROM pg_collation c, pg_namespace nc
WHERE c.collnamespace = nc.oid
AND collencoding = (SELECT encoding FROM pg_catalog.pg_database WHERE datname = pg_catalog.current_database());
GRANT SELECT ON collations TO PUBLIC;
/*
* 5.16
* COLLATION_CHARACTER_SET_APPLICABILITY view
*/
-- feature not supported
CREATE VIEW collation_character_set_applicability AS
SELECT CAST(current_database() AS sql_identifier) AS collation_catalog,
CAST(nc.nspname AS sql_identifier) AS collation_schema,
CAST(c.collname AS sql_identifier) AS collation_name,
CAST(null AS sql_identifier) AS character_set_catalog,
CAST(null AS sql_identifier) AS character_set_schema,
CAST(getdatabaseencoding() AS sql_identifier) AS character_set_name
FROM pg_collation c, pg_namespace nc
WHERE c.collnamespace = nc.oid
AND collencoding = (SELECT encoding FROM pg_catalog.pg_database WHERE datname = pg_catalog.current_database());
GRANT SELECT ON collation_character_set_applicability TO PUBLIC;
/*

2
src/include/catalog/catversion.h
View File

@ -53,6 +53,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 201102084
#define CATALOG_VERSION_NO 201102091
#endif