如何在PostgreSQL转储中删除LANGUAGE c函数以导入CloudSQL？

Question

我想将Postgres转储导入CloudSQL。我实际上使用了uuid-ossp扩展名，并且语言c中的某些函数已导出到我的转储中。

但是，LANGUAGE c中的功能在云SQL https://cloud.google.com/sql/docs/postgres/extensions#language上是不允许的，我需要将其从转储中删除。 （请注意，稍后可以通过在cloudSQL数据库中激活扩展uuid-ossp来重新启用这些功能）

所以...我需要一个技巧来从转储文件中删除这些功能。

从包含以下功能的转储中提取：

--
-- TOC entry 542 (class 1255 OID 16529)
-- Name: uuid_generate_v1(); Type: FUNCTION; Schema: public; Owner: -
--

CREATE FUNCTION uuid_generate_v1() RETURNS uuid
    LANGUAGE c STRICT
    AS '$libdir/uuid-ossp', 'uuid_generate_v1';


--
-- TOC entry 543 (class 1255 OID 16530)
-- Name: uuid_generate_v1mc(); Type: FUNCTION; Schema: public; Owner: -
--

CREATE FUNCTION uuid_generate_v1mc() RETURNS uuid
    LANGUAGE c STRICT
    AS '$libdir/uuid-ossp', 'uuid_generate_v1mc';


--
-- TOC entry 544 (class 1255 OID 16531)
-- Name: uuid_generate_v3(uuid, text); Type: FUNCTION; Schema: public; Owner: -
--

CREATE FUNCTION uuid_generate_v3(namespace uuid, name text) RETURNS uuid
    LANGUAGE c IMMUTABLE STRICT
    AS '$libdir/uuid-ossp', 'uuid_generate_v3';


--
-- TOC entry 545 (class 1255 OID 16532)
-- Name: uuid_generate_v4(); Type: FUNCTION; Schema: public; Owner: -
--

CREATE FUNCTION uuid_generate_v4() RETURNS uuid
    LANGUAGE c STRICT
    AS '$libdir/uuid-ossp', 'uuid_generate_v4';


--
-- TOC entry 546 (class 1255 OID 16533)
-- Name: uuid_generate_v5(uuid, text); Type: FUNCTION; Schema: public; Owner: -
--

CREATE FUNCTION uuid_generate_v5(namespace uuid, name text) RETURNS uuid
    LANGUAGE c IMMUTABLE STRICT
    AS '$libdir/uuid-ossp', 'uuid_generate_v5';


--
-- TOC entry 547 (class 1255 OID 16534)
-- Name: uuid_nil(); Type: FUNCTION; Schema: public; Owner: -
--

CREATE FUNCTION uuid_nil() RETURNS uuid
    LANGUAGE c IMMUTABLE STRICT
    AS '$libdir/uuid-ossp', 'uuid_nil';


--
-- TOC entry 548 (class 1255 OID 16535)
-- Name: uuid_ns_dns(); Type: FUNCTION; Schema: public; Owner: -
--

CREATE FUNCTION uuid_ns_dns() RETURNS uuid
    LANGUAGE c IMMUTABLE STRICT
    AS '$libdir/uuid-ossp', 'uuid_ns_dns';


--
-- TOC entry 549 (class 1255 OID 16536)
-- Name: uuid_ns_oid(); Type: FUNCTION; Schema: public; Owner: -
--

CREATE FUNCTION uuid_ns_oid() RETURNS uuid
    LANGUAGE c IMMUTABLE STRICT
    AS '$libdir/uuid-ossp', 'uuid_ns_oid';


--
-- TOC entry 550 (class 1255 OID 16537)
-- Name: uuid_ns_url(); Type: FUNCTION; Schema: public; Owner: -
--

CREATE FUNCTION uuid_ns_url() RETURNS uuid
    LANGUAGE c IMMUTABLE STRICT
    AS '$libdir/uuid-ossp', 'uuid_ns_url';


--
-- TOC entry 512 (class 1255 OID 16538)
-- Name: uuid_ns_x500(); Type: FUNCTION; Schema: public; Owner: -
--

CREATE FUNCTION uuid_ns_x500() RETURNS uuid
    LANGUAGE c IMMUTABLE STRICT
    AS '$libdir/uuid-ossp', 'uuid_ns_x500';

Answer 1

解决方案1：清理数据库并重新导出转储

（根据@Laurenz Albe评论编辑）

1. 在所有DROP FUNCTION函数上执行LANGUAGE c
2. 转储数据库
3. 在转储开始时添加CREATE EXTENSION uuid-ossp

解决方案2：解析并清理转储

不是最好的，但是似乎可以。

基于这样的事实，幸运的是，要删除的所需函数位于3行：

# Extract all the language c functions (1 line before and 1 line after the "LANGUAGE c" line
grep -B 1 -A 1 "LANGUAGE c" schema.sql  > language-c-functions.sql

# Make the diff between the files, and keep line that are not in both files
diff schema.sql language-c-functions.sql | grep \^\< | sed 's/^<\ //' > cleaned.sql