information_schema.sql

来自「PostgreSQL7.4.6 for Linux」· SQL 代码 · 共 1,693 行 · 第 1/5 页

           CAST(null AS sql_identifier) AS self_referencing_column_name,
           CAST(null AS character_data) AS reference_generation,

           CAST(null AS sql_identifier) AS user_defined_type_catalog,
           CAST(null AS sql_identifier) AS user_defined_type_schema,
           CAST(null AS sql_identifier) AS user_defined_name

    FROM pg_namespace nc, pg_class c, pg_user u

    WHERE c.relnamespace = nc.oid AND u.usesysid = c.relowner
          AND c.relkind IN ('r', 'v')
          AND (u.usename = current_user
               OR has_table_privilege(c.oid, 'SELECT')
               OR has_table_privilege(c.oid, 'INSERT')
               OR has_table_privilege(c.oid, 'UPDATE')
               OR has_table_privilege(c.oid, 'DELETE')
               OR has_table_privilege(c.oid, 'RULE')
               OR has_table_privilege(c.oid, 'REFERENCES')
               OR has_table_privilege(c.oid, 'TRIGGER') );

GRANT SELECT ON tables TO PUBLIC;


/*
 * 20.59
 * TRIGGERED_UPDATE_COLUMNS view
 */

-- PostgreSQL doesn't allow the specification of individual triggered
-- update columns, so this view is empty.

CREATE VIEW triggered_update_columns AS
    SELECT CAST(current_database() AS sql_identifier) AS trigger_catalog,
           CAST(null AS sql_identifier) AS trigger_schema,
           CAST(null AS sql_identifier) AS trigger_name,
           CAST(current_database() AS sql_identifier) AS event_object_catalog,
           CAST(null AS sql_identifier) AS event_object_schema,
           CAST(null AS sql_identifier) AS event_object_table,
           CAST(null AS sql_identifier) AS event_object_column
    WHERE false;

GRANT SELECT ON triggered_update_columns TO PUBLIC;


/*
 * 20.62
 * TRIGGERS view
 */

CREATE VIEW triggers AS
    SELECT CAST(current_database() AS sql_identifier) AS trigger_catalog,
           CAST(n.nspname AS sql_identifier) AS trigger_schema,
           CAST(t.tgname AS sql_identifier) AS trigger_name,
           CAST(em.text AS character_data) AS event_manipulation,
           CAST(current_database() AS sql_identifier) AS event_object_catalog,
           CAST(n.nspname AS sql_identifier) AS event_object_schema,
           CAST(c.relname AS sql_identifier) AS event_object_table,
           CAST(null AS cardinal_number) AS action_order,
           CAST(null AS character_data) AS action_condition,
           CAST(
             substring(pg_get_triggerdef(t.oid) from
                       position('EXECUTE PROCEDURE' in substring(pg_get_triggerdef(t.oid) from 48)) + 47)
             AS character_data) AS action_statement,
           CAST(
             CASE WHEN t.tgtype & 1 = 1 THEN 'ROW' ELSE 'STATEMENT' END
             AS character_data) AS action_orientation,
           CAST(
             CASE WHEN t.tgtype & 2 = 2 THEN 'BEFORE' ELSE 'AFTER' END
             AS character_data) AS condition_timing,
           CAST(null AS sql_identifier) AS condition_reference_old_table,
           CAST(null AS sql_identifier) AS condition_reference_new_table

    FROM pg_namespace n, pg_class c, pg_trigger t, pg_user u,
         (SELECT 4, 'INSERT' UNION ALL
          SELECT 8, 'DELETE' UNION ALL
          SELECT 16, 'UPDATE') AS em (num, text)

    WHERE n.oid = c.relnamespace
          AND c.oid = t.tgrelid
          AND c.relowner = u.usesysid
          AND t.tgtype & em.num <> 0
          AND NOT t.tgisconstraint
          AND u.usename = current_user;

GRANT SELECT ON triggers TO PUBLIC;


/*
 * 20.63
 * USAGE_PRIVILEGES view
 */

-- Of the things currently implemented in PostgreSQL, usage privileges
-- apply only to domains.  Since domains have no real privileges, we
-- represent all domains with implicit usage privilege here.

CREATE VIEW usage_privileges AS
    SELECT CAST(u.usename AS sql_identifier) AS grantor,
           CAST('PUBLIC' AS sql_identifier) AS grantee,
           CAST(current_database() AS sql_identifier) AS object_catalog,
           CAST(n.nspname AS sql_identifier) AS object_schema,
           CAST(t.typname AS sql_identifier) AS object_name,
           CAST('DOMAIN' AS character_data) AS object_type,
           CAST('USAGE' AS character_data) AS privilege_type,
           CAST('NO' AS character_data) AS is_grantable

    FROM pg_user u,
         pg_namespace n,
         pg_type t

    WHERE u.usesysid = t.typowner
          AND t.typnamespace = n.oid
          AND t.typtype = 'd';

GRANT SELECT ON usage_privileges TO PUBLIC;


/*
 * 20.65
 * VIEW_COLUMN_USAGE
 */

CREATE VIEW view_column_usage AS
    SELECT DISTINCT
           CAST(current_database() AS sql_identifier) AS view_catalog,
           CAST(nv.nspname AS sql_identifier) AS view_schema,
           CAST(v.relname AS sql_identifier) AS view_name,
           CAST(current_database() AS sql_identifier) AS table_catalog,
           CAST(nt.nspname AS sql_identifier) AS table_schema,
           CAST(t.relname AS sql_identifier) AS table_name,
           CAST(a.attname AS sql_identifier) AS column_name

    FROM pg_user, pg_namespace nv, pg_class v, pg_depend dv,
         pg_depend dt, pg_class t, pg_namespace nt,
         pg_attribute a, pg_user u

    WHERE nv.oid = v.relnamespace
          AND v.relkind = 'v'
          AND v.oid = dv.refobjid
          AND dv.refclassid = 'pg_catalog.pg_class'::regclass
          AND dv.classid = 'pg_catalog.pg_rewrite'::regclass
          AND dv.deptype = 'i'
          AND dv.objid = dt.objid
          AND dv.refobjid <> dt.refobjid
          AND dt.classid = 'pg_catalog.pg_rewrite'::regclass
          AND dt.refclassid = 'pg_catalog.pg_class'::regclass
          AND dt.refobjid = t.oid
          AND t.relnamespace = nt.oid
          AND t.relkind IN ('r', 'v')
          AND t.oid = a.attrelid
          AND dt.refobjsubid = a.attnum
          AND t.relowner = u.usesysid AND u.usename = current_user;

GRANT SELECT ON view_column_usage TO PUBLIC;


/*
 * 20.66
 * VIEW_TABLE_USAGE
 */

CREATE VIEW view_table_usage AS
    SELECT DISTINCT
           CAST(current_database() AS sql_identifier) AS view_catalog,
           CAST(nv.nspname AS sql_identifier) AS view_schema,
           CAST(v.relname AS sql_identifier) AS view_name,
           CAST(current_database() AS sql_identifier) AS table_catalog,
           CAST(nt.nspname AS sql_identifier) AS table_schema,
           CAST(t.relname AS sql_identifier) AS table_name

    FROM pg_user, pg_namespace nv, pg_class v, pg_depend dv,
         pg_depend dt, pg_class t, pg_namespace nt,
         pg_user u

    WHERE nv.oid = v.relnamespace
          AND v.relkind = 'v'
          AND v.oid = dv.refobjid
          AND dv.refclassid = 'pg_catalog.pg_class'::regclass
          AND dv.classid = 'pg_catalog.pg_rewrite'::regclass
          AND dv.deptype = 'i'
          AND dv.objid = dt.objid
          AND dv.refobjid <> dt.refobjid
          AND dt.classid = 'pg_catalog.pg_rewrite'::regclass
          AND dt.refclassid = 'pg_catalog.pg_class'::regclass
          AND dt.refobjid = t.oid
          AND t.relnamespace = nt.oid
          AND t.relkind IN ('r', 'v')
          AND t.relowner = u.usesysid AND u.usename = current_user;

GRANT SELECT ON view_table_usage TO PUBLIC;


/*
 * 20.68
 * VIEWS view
 */

CREATE VIEW views AS
    SELECT CAST(current_database() AS sql_identifier) AS table_catalog,
           CAST(nc.nspname AS sql_identifier) AS table_schema,
           CAST(c.relname AS sql_identifier) AS table_name,

           CAST(
             CASE WHEN u.usename = current_user THEN pg_get_viewdef(c.oid)
                  ELSE null END
             AS character_data) AS view_definition,

           CAST('NONE' AS character_data) AS check_option,
           CAST(null AS character_data) AS is_updatable, -- FIXME
           CAST(null AS character_data) AS is_insertable_into  -- FIXME

    FROM pg_namespace nc, pg_class c, pg_user u

    WHERE c.relnamespace = nc.oid AND u.usesysid = c.relowner
          AND c.relkind = 'v'
          AND (u.usename = current_user
               OR has_table_privilege(c.oid, 'SELECT')
               OR has_table_privilege(c.oid, 'INSERT')
               OR has_table_privilege(c.oid, 'UPDATE')
               OR has_table_privilege(c.oid, 'DELETE')
               OR has_table_privilege(c.oid, 'RULE')
               OR has_table_privilege(c.oid, 'REFERENCES')
               OR has_table_privilege(c.oid, 'TRIGGER') );

GRANT SELECT ON views TO PUBLIC;


-- The following views have dependencies that force them to appear out of order.

/*
 * 20.21
 * DATA_TYPE_PRIVILEGES view
 */

CREATE VIEW data_type_privileges AS
    SELECT CAST(current_database() AS sql_identifier) AS object_catalog,
           CAST(x.objschema AS sql_identifier) AS object_schema,
           CAST(x.objname AS sql_identifier) AS object_name,
           CAST(x.objtype AS character_data) AS object_type,
           CAST(x.objdtdid AS sql_identifier) AS dtd_identifier

    FROM
      (
        SELECT table_schema, table_name, 'TABLE'::text, dtd_identifier FROM columns
        UNION ALL
        SELECT domain_schema, domain_name, 'DOMAIN'::text, dtd_identifier FROM domains
        UNION ALL
        SELECT specific_schema, specific_name, 'ROUTINE'::text, dtd_identifier FROM parameters
        UNION ALL
        SELECT specific_schema, specific_name, 'ROUTINE'::text, dtd_identifier FROM routines
      ) AS x (objschema, objname, objtype, objdtdid);

GRANT SELECT ON data_type_privileges TO PUBLIC;


/*
 * 20.27
 * ELEMENT_TYPES view
 */

CREATE VIEW element_types AS
    SELECT CAST(current_database() AS sql_identifier) AS object_catalog,
           CAST(n.nspname AS sql_identifier) AS object_schema,
           CAST(x.objname AS sql_identifier) AS object_name,
           CAST(x.objtype AS character_data) AS object_type,
           CAST(x.objdtdid AS sql_identifier) AS array_type_identifier,
           CAST(
             CASE WHEN nbt.nspname = 'pg_catalog' THEN format_type(bt.oid, null)
                  ELSE 'USER-DEFINED' END AS character_data) AS data_type,

           CAST(null AS cardinal_number) AS character_maximum_length,
           CAST(null AS cardinal_number) AS character_octet_length,
           CAST(null AS sql_identifier) AS character_set_catalog,
           CAST(null AS sql_identifier) AS character_set_schema,
           CAST(null AS sql_identifier) AS character_set_name,
           CAST(null AS sql_identifier) AS collation_catalog,
           CAST(null AS sql_identifier) AS collation_schema,
           CAST(null AS sql_identifier) AS collation_name,
           CAST(null AS cardinal_number) AS numeric_precision,
           CAST(null AS cardinal_number) AS numeric_precision_radix,
           CAST(null AS cardinal_number) AS numeric_scale,
           CAST(null AS cardinal_number) AS datetime_precision,
           CAST(null AS character_data) AS interval_type,
           CAST(null AS character_data) AS interval_precision,
           
           CAST(null AS character_data) AS domain_default, -- XXX maybe a bug in the standard

           CAST(current_database() AS sql_identifier) AS udt_catalog,
           CAST(nbt.nspname AS sql_identifier) AS udt_schema,
           CAST(bt.typname AS sql_identifier) AS udt_name,

           CAST(null AS sql_identifier) AS scope_catalog,
           CAST(null AS sql_identifier) AS scope_schema,
           CAST(null AS sql_identifier) AS scope_name,

           CAST(null AS cardinal_number) AS maximum_cardinality,
           CAST('a' || x.objdtdid AS sql_identifier) AS dtd_identifier

    FROM pg_namespace n, pg_type at, pg_namespace nbt, pg_type bt,
         (
           /* columns */
           SELECT c.relnamespace, CAST(c.relname AS sql_identifier),
                  'TABLE'::text, a.attnum, a.atttypid
           FROM pg_class c, pg_attribute a
           WHERE c.oid = a.attrelid
                 AND c.relkind IN ('r', 'v')
                 AND attnum > 0 AND NOT attisdropped

           UNION ALL

           /* domains */
           SELECT t.typnamespace, CAST(t.typname AS sql_identifier),
                  'DOMAIN'::text, 1, t.typbasetype
           FROM pg_type t
           WHERE t.typtype = 'd'

           UNION ALL

           /* parameters */
           SELECT p.pronamespace, CAST(p.proname || '_' || CAST(p.oid AS text) AS sql_identifier),
                  'ROUTINE'::text, pos.n, p.proargtypes[pos.n-1]
           FROM pg_proc p, _pg_keypositions() AS pos(n)
           WHERE p.pronargs >= pos.n

           UNION ALL

           /* result types */
           SELECT p.pronamespace, CAST(p.proname || '_' || CAST(p.oid AS text) AS sql_identifier),
                  'ROUTINE'::text, 0, p.prorettype
           FROM pg_proc p

         ) AS x (objschema, objname, objtype, objdtdid, objtypeid)

    WHERE n.oid = x.objschema
          AND at.oid = x.objtypeid
          AND (at.typelem <> 0 AND at.typlen = -1)
          AND at.