PostgreSQL批量修改函数拥有者的操作

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Postgresql如何批量修改函数拥有者，默认创建的函数对象的拥有者为当前创建的用户，如果使用postgres超级管理员创建一个test()的函数，拥有者就是postgres用户。下面讲解下如何批量修改拥有者。

本文演示的Postgresql版本如下：

PostgreSQL 9.6.8

单个修改

如果需要修改的函数只有一个，请执行如下SQL语句即可：

// 无参数函数
ALTER FUNCTION "abc"."test"() OWNER TO "dbadmin";
//带参数函数
ALTER FUNCTION "abc"."test3"(p1 varchar, p2 varchar) OWNER TO "dbadmin";

批量修改

首先可以查询当前模式下函数的所有者分别是哪个用户，使用下面SQL来查询：

SELECT 
n.nspname as "Schema",
p.proname as "Name",
pg_catalog.pg_get_function_result(p.oid) as "Result data type",
pg_catalog.pg_get_function_arguments(p.oid) as "Argument data types",
pg_catalog.pg_get_userbyid(p.proowner) as "Owner"
FROM pg_catalog.pg_proc p
  LEFT JOIN pg_catalog.pg_namespace n ON n.oid = p.pronamespace
  LEFT JOIN pg_catalog.pg_language l ON l.oid = p.prolang
WHERE pg_catalog.pg_function_is_visible(p.oid)
  AND n.nspname <> 'pg_catalog'
  AND n.nspname <> 'information_schema'
ORDER BY 1, 2;

当前显示模式“abc”有2个无参函数和1个带参函数，拥有者都是postgres超级用户。

然后根据上面讲的两个视图： routines 和 parameters关联查询出模式下的所有函数和参数（目的是为了拼接SQL语句），参考如下：

SELECT 
"routines".specific_schema,
"routines".routine_name, 
COALESCE("parameters".parameter_name, '') AS parameter_name, -- COALESCE返回参数中的第一个非null的值
COALESCE("parameters".udt_name, '') AS udt_name,
COALESCE("parameters".parameter_name, '') || ' ' || COALESCE("parameters".udt_name, '') AS params,
"parameters".ordinal_position 
FROM "information_schema"."routines"
LEFT JOIN "information_schema"."parameters" ON "routines".specific_name="parameters".specific_name 
WHERE "routines".specific_schema='abc' 
ORDER BY 1,2,6;

这里我们再使用聚合函数: string_agg 把字段 params所有行连接成字符串，并用逗号分隔符分隔。

WITH tmp AS (SELECT 
"routines".specific_schema,
"routines".routine_name, 
COALESCE("parameters".parameter_name, '') AS parameter_name, -- COALESCE返回参数中的第一个非null的值
COALESCE("parameters".udt_name, '') AS udt_name,
COALESCE("parameters".parameter_name, '') || ' ' || COALESCE("parameters".udt_name, '') AS params,
"parameters".ordinal_position 
FROM "information_schema"."routines"
LEFT JOIN "information_schema"."parameters" ON "routines".specific_name="parameters".specific_name 
WHERE "routines".specific_schema='abc' 
ORDER BY 1,2,6) 
SELECT 
specific_schema, 
routine_name, 
string_agg(params, ',') AS params, 
'"'||specific_schema||'"."'||routine_name||'"('||string_agg(params, ',')||')' AS fname 
FROM tmp GROUP BY specific_schema, routine_name;

最后使用一个Postgres执行代码片段完成批量修改，完整SQL如下：

DO $$
DECLARE r record;
BEGIN
FOR r IN
WITH tmp AS (SELECT 
"routines".specific_schema,
"routines".routine_name, 
COALESCE("parameters".parameter_name, '') AS parameter_name, -- COALESCE返回参数中的第一个非null的值
COALESCE("parameters".udt_name, '') AS udt_name,
COALESCE("parameters".parameter_name, '') || ' ' || COALESCE("parameters".udt_name, '') AS params,
"parameters".ordinal_position 
FROM "information_schema"."routines"
LEFT JOIN "information_schema"."parameters" ON "routines".specific_name="parameters".specific_name 
WHERE "routines".specific_schema='abc' 
ORDER BY 1,2,6) SELECT '"'||specific_schema||'"."'||routine_name||'"('||string_agg(params, ',')||')' AS fname FROM tmp GROUP BY specific_schema, routine_name
LOOP
EXECUTE 'ALTER FUNCTION '|| r.fname||' OWNER TO "dbadmin" ';
END LOOP;
END $$;

可以看到模式“abc”的Owner已经全部改为dbadmin这个账号了。

上次批量修改函数可能存在部分特殊场景会报错，会把“参数类型” + “返回类型” 拼接在一起

改进方法：我们通过pg_catalog目录来实现批量修改，参考代码如下：

DO $$
DECLARE r record;
BEGIN
FOR r IN
 WITH tmp AS (
 SELECT n.nspname as "Schema",
 p.proname as "Name",
 pg_catalog.pg_get_function_result(p.oid) as "Result data type",
 pg_catalog.pg_get_function_arguments(p.oid) as "Argument data types",
 CASE
 WHEN p.proisagg THEN 'agg'
 WHEN p.proiswindow THEN 'window'
 WHEN p.prorettype = 'pg_catalog.trigger'::pg_catalog.regtype THEN 'trigger'
 ELSE 'normal'
 END as "Type"
 FROM pg_catalog.pg_proc p
  LEFT JOIN pg_catalog.pg_namespace n ON n.oid = p.pronamespace
 WHERE n.nspname = 'etl'
 ORDER BY 1, 2, 4
 ) SELECT '"' || "Schema" || '"' || '.' || '"' || "Name" || '"' || '(' || "Argument data types" ||')' AS fname FROM tmp
LOOP
EXECUTE 'ALTER FUNCTION '|| r.fname||' OWNER TO "postgres" ';
END LOOP;
END $$;

补充：PostgreSQL更改Owner所有者

网上一个大神写的

SELECT
‘alter table ' || nsp.nspname || ‘.' || cls.relname || ' owner to usr_zhudong;' || chr ( 13 )
FROM
pg_catalog.pg_class cls,
pg_catalog.pg_namespace nsp
WHERE
nsp.nspname IN ( ‘public' )
AND cls.relnamespace = nsp.oid
AND cls.relkind = ‘r'
ORDER BY
nsp.nspname,
cls.relname;

我来做一个改版

SELECT
'alter table ' || nsp.nspname || '.' || cls.relname || ' owner to test2;' || chr ( 13 )
FROM
pg_catalog.pg_class cls,
pg_catalog.pg_namespace nsp
WHERE
nsp.nspname IN ( 'public' )
AND cls.relnamespace = nsp.oid
AND cls.relkind = 'r'
ORDER BY
nsp.nspname,
cls.relname;
 
SELECT
'alter table "' || nsp.nspname || '"."' || cls.relname || '" owner to user01;' || chr ( 13 )
FROM
pg_catalog.pg_class cls,
pg_catalog.pg_namespace nsp
WHERE
nsp.nspname IN ( 'public' )
AND cls.relnamespace = nsp.oid
AND cls.relkind = 'r'
ORDER BY
nsp.nspname,
cls.relname;

效果：

以上为个人经验，希望能给大家一个参考，也希望大家多多支持极客世界。如有错误或未考虑完全的地方，望不吝赐教。