队 我正在研究亚马逊RDS Postgres（9.3.1 / 9.3.2 / 9.3.3）
pgtest=> select version();
version
--------------------------------------------------------------------------------------------------------------
PostgreSQL 9.3.3 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.6.3 20120306 (Red Hat 4.6.3-2), 64-bit
(1 row)
我正在使用下面的脚本动态生成revoke语句。这适用于亚马逊红移。但不是在Postgres。它给出了错误。任何人都能纠正我吗？我可以在此获取子查询的查询输出。
注意：在redshift中，截至目前不支持触发器。所以我排除了＆＃34;触发＆＃34;在撤销列表中。但我现在正试图在AMAZON RDS Postgres中执行
select
'revoke ' || substring(
case when charindex('r',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',select ' else '' end
||case when charindex('w',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',update ' else '' end
||case when charindex('a',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',insert ' else '' end
||case when charindex('d',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',delete ' else '' end
||case when charindex('R',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',rule ' else '' end
||case when charindex('x',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',references ' else '' end
||case when charindex('X',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',execute ' else '' end
||case when charindex('U',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',usage ' else '' end
||case when charindex('C',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',create ' else '' end
||case when charindex('T',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',temporary ' else '' end
, 2,10000)
|| ' on '||namespace||'.'||item ||' from "'||pu.usename||'";' as grantsql
from
(SELECT
use.usename as subject,
nsp.nspname as namespace,
c.relname as item,
c.relkind as type,
use2.usename as owner,
c.relacl
FROM
pg_user use
cross join pg_class c
left join pg_namespace nsp on (c.relnamespace = nsp.oid)
left join pg_user use2 on (c.relowner = use2.usesysid)
WHERE
c.relowner = use.usesysid
and nsp.nspname NOT IN ('pg_catalog', 'pg_toast', 'information_schema')
ORDER BY subject, namespace, item
) as AA join pg_user pu on array_to_string(relacl, '|') like '%'||pu.usename||'%'
where relacl is not null
and pu.usename='test_user55';
我收到以下错误：
dbsa_db=> select
dbsa_db-> 'revoke ' || substring(
dbsa_db(> case when charindex('r',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',select ' else '' end
dbsa_db(> ||case when charindex('w',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',update ' else '' end
dbsa_db(> ||case when charindex('a',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',insert ' else '' end
dbsa_db(> ||case when charindex('d',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',delete ' else '' end
dbsa_db(> ||case when charindex('R',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',rule ' else '' end
dbsa_db(> ||case when charindex('x',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',references ' else '' end
dbsa_db(> ||case when charindex('X',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',execute ' else '' end
dbsa_db(> ||case when charindex('U',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',usage ' else '' end
dbsa_db(> ||case when charindex('C',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',create ' else '' end
dbsa_db(> ||case when charindex('T',split_part(split_part(array_to_string(relacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',temporary ' else '' end
dbsa_db(> , 2,10000)
dbsa_db-> || ' on '||namespace||'.'||item ||' from "'||pu.usename||'";' as grantsql
dbsa_db-> from
dbsa_db-> (SELECT
dbsa_db(> use.usename as subject,
dbsa_db(> nsp.nspname as namespace,
dbsa_db(> c.relname as item,
dbsa_db(> c.relkind as type,
dbsa_db(> use2.usename as owner,
dbsa_db(> c.relacl
dbsa_db(> FROM
dbsa_db(> pg_user use
dbsa_db(> cross join pg_class c
dbsa_db(> left join pg_namespace nsp on (c.relnamespace = nsp.oid)
dbsa_db(> left join pg_user use2 on (c.relowner = use2.usesysid)
dbsa_db(> WHERE
dbsa_db(> c.relowner = use.usesysid
dbsa_db(> and nsp.nspname NOT IN ('pg_catalog', 'pg_toast', 'information_schema')
dbsa_db(> ORDER BY subject, namespace, item
dbsa_db(> ) as AA join pg_user pu on array_to_string(relacl, '|') like '%'||pu.usename||'%'
dbsa_db-> where relacl is not null
dbsa_db-> and pu.usename='test_user55';
ERROR: function charindex(unknown, text) does not exist
LINE 3: case when charindex('r',split_part(split_part(a...
^
HINT: No function matches the given name and argument types. You might need to add explicit type casts.
dbsa_db=>
dbsa_db=>
dbsa_db=> SELECT
dbsa_db-> use.usename as subject,
dbsa_db-> nsp.nspname as namespace,
dbsa_db-> c.relname as item,
dbsa_db-> c.relkind as type,
dbsa_db-> use2.usename as owner,
dbsa_db-> c.relacl
dbsa_db-> FROM
dbsa_db-> pg_user use
dbsa_db-> cross join pg_class c
dbsa_db-> left join pg_namespace nsp on (c.relnamespace = nsp.oid)
dbsa_db-> left join pg_user use2 on (c.relowner = use2.usesysid)
dbsa_db-> WHERE
dbsa_db-> c.relowner = use.usesysid
dbsa_db-> and nsp.nspname NOT IN ('pg_catalog', 'pg_toast', 'information_schema')
dbsa_db-> ORDER BY subject, namespace, item;
subject | namespace | item | type | owner | relacl
-----------------+-----------+------------+------+-----------------+-------------------------------------------------------------------------------------------------------------------------
test_user55 | schema1 | table_mmar | r | test_user55 |
dbsa | schema1 | table1 | r | dbsa | {dbsa=arwdDxt/dbsa,service_user1=a*r*w*d*D*x*t*/dbsa,service_user2=a*r*w*d*D*x*t*/dbsa}
dbsa | schema1 | view1 | v | dbsa | {dbsa=arwdDxt/dbsa,service_user1=a*r*w*d*D*x*t*/dbsa,service_user2=a*r*w*d*D*x*t*/dbsa,test_user55=r/service_user1}
(3 rows)
dbsa_db=>
（ii）query2： 下面查询iam用于提取在schemalevel给出的任何授权。这在红移中运行良好。但不是在postgre 9.3.3
select
'revoke ' || substring(
case when charindex('U',split_part(split_part(array_to_string(nspacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',usage ' else '' end
||case when charindex('C',split_part(split_part(array_to_string(nspacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',create ' else '' end
, 2,10000)
|| ' on schema '||nspname||' from "'||pu.usename||'";' as syntax
from pg_namespace pn,pg_user pu
where pu.usename='test_user55' and array_to_string(nspacl,',') like '%'||pu.usename||'%'
and nspowner >= 1 ;
dbsa_db=> select substring(
dbsa_db(> case when charindex('U',split_part(split_part(array_to_string(nspacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',usage ' else '' end , 2,10000),
dbsa_db-> substring(
dbsa_db(> case when charindex('C',split_part(split_part(array_to_string(nspacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',create ' else '' end , 2,10000)
dbsa_db-> ,nspname
dbsa_db-> from pg_namespace pn, pg_user pu
dbsa_db-> where pu.usename='test_user55' and array_to_string(nspacl,',') like '%'||pu.usename||'%'
dbsa_db-> and nspowner > 1 ;
ERROR: function charindex(unknown, text) does not exist
LINE 2: case when charindex('U',split_part(split_part(array_...
^
HINT: No function matches the given name and argument types. You might need to add explicit type casts.
dbsa_db=>
（iii）query3 下面的查询我用来检查数据库级别是否给出任何授权。这适用于红移，但不适用于rds postgres。
dbsa_db=> grant all on database dbsa_db to test_user55;
GRANT
dbsa_db=>
select pu.usename, pd.datname, substring(
case when charindex('C',split_part(split_part(array_to_string(datacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',create ' else '' end, 2,10000),
substring(
case when charindex('T',split_part(split_part(array_to_string(datacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',temp ' else '' end, 2,10000)
from pg_database pd,pg_user pu
where pu.usename='test_user55' and array_to_string(datacl,',') like '%'||pu.usename||'%'
and datdba > 1;
dbsa_db=> select pu.usename, pd.datname, substring(
dbsa_db(> case when charindex('C',split_part(split_part(array_to_string(datacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',create ' else '' end, 2,10000),
dbsa_db-> substring(
dbsa_db(> case when charindex('T',split_part(split_part(array_to_string(datacl, '|'),pu.usename,2 ) ,'/',1)) > 0 then ',temp ' else '' end, 2,10000)
dbsa_db-> from pg_database pd,pg_user pu
dbsa_db-> where pu.usename='test_user55' and array_to_string(datacl,',') like '%'||pu.usename||'%'
dbsa_db-> and datdba > 1;
ERROR: function charindex(unknown, text) does not exist
LINE 2: case when charindex('C',split_part(split_part(ar...
^
HINT: No function matches the given name and argument types. You might need to add explicit type casts.
dbsa_db=>
请指导我。 感谢。
答案 0 :(得分：0)
PostgreSQL没有 charindex 功能，Amazon Redshift将此添加为 strpos 的同义词。对于使用PostgreSQL的Amazon RDS，您可以使用位置或 strpos 功能。
示例：Amazon Redshift可以执行此操作：
select charindex('fish', 'dogfish');
对于使用PostgreSQL的Amazon RDS，您可以执行以下两种操作之一：
select strpos('dogfish', 'fish');
select position('fish' in 'dogfish');
请注意 strpos 中的子字符串和字符串是相反的!!
所有结果都是4。
此外，这里有关于PostgreSQL字符串函数的文档： http://www.postgresql.org/docs/8.3/static/functions-string.html