如何获取 PostgreSQL 10 中排除约束的详细信息？

Question

我正在开发一个SQL Postgre客户端工具SQL，想在工具中支持EXCLUDE约束功能，如何在Postgre中获取排除约束的详细信息SQL10?

我希望获得 EXCLUDE 约束的详细信息，如名称/索引方法/元素/注释/缓冲区/where/deferrable/deferred 等

Answer 1

我将使用这个例子：

CREATE TABLE xclude (id integer NOT NULL, EXCLUDE (id WITH =));

您可以使用这个查询：

SELECT c2.relname,
       i.indisvalid,
       pg_catalog.pg_get_indexdef(i.indexrelid, 0, true),
       pg_catalog.pg_get_constraintdef(con.oid, true),
       contype,
       condeferrable,
       condeferred,
       c2.reltablespace
FROM pg_catalog.pg_class c
   JOIN pg_catalog.pg_index i ON c.oid = i.indrelid
   JOIN pg_catalog.pg_class c2 On i.indexrelid = c2.oid
   LEFT JOIN pg_catalog.pg_constraint con ON (conrelid = i.indrelid AND conindid = i.indexrelid AND contype IN ('x'))
WHERE c.oid = 'xclude'::regclass;

结果：

relname              | xclude_id_excl
indisvalid           | t
pg_get_indexdef      | CREATE INDEX xclude_id_excl ON xclude USING btree (id)
pg_get_constraintdef | EXCLUDE USING btree (id WITH =)
contype              | x
condeferrable        | f
condeferred          | f
reltablespace        | 0

如何获取 PostgreSQL 10 中排除约束的详细信息？

how to get detail information of a exclude constraint in PostgreSQL 10?

postgresql

constraints

information-schema