GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
RedHat 6.2(Zoot) |
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grant(l) |
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GRANT − Grants access privilege to a user, a group or all users
GRANT
privilege [, ...] ON object [, ...]
TO { PUBLIC | GROUP group | username }
INPUTS
privilege
The possible privileges are:
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SELECT |
Access all of the columns of a specific table/view. | ||
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INSERT |
Insert data into all columns of a specific table. | ||
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UPDATE |
Update all columns of a specific table. | ||
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DELETE |
Delete rows from a specific table. | ||
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RULE |
Define rules on the table/view (See CREATE RULE statement). | ||
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ALL |
Grant all privileges. | ||
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object |
The name of an object to which to grant access. The possible objects are:
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• |
table |
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• |
view |
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sequence |
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index |
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PUBLIC |
A short form representing all users.
GROUP group
A group to whom to grant privileges. In the current release, the group must be created explicitly as described below.
username
The name of a user to whom grant privileges. PUBLIC is a short form representing all users.
OUTPUTS
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CHANGE |
Message returned if successful. |
ERROR: ChangeAcl: class "object" not found
Message returned if the specified object is not available or if it is impossible to give privileges to the specified group or users.
GRANT allows the creator of an object to give specific permissions to all users (PUBLIC) or to a certain user or group. Users other than the creator don’t have any access permission unless the creator GRANTs permissions, after the object is created.
Once a user has a privilege on an object, he is enabled to exercise that privilege. There is no need to GRANT privileges to the creator of an object, the creator automatically holds ALL privileges, and can also drop the object.
NOTES
Currently, to grant privileges in Postgres to only few
columns, you must create a view having desired columns and
then grant privileges to that view.
Use psql \z for further information about permissions on existing objects:
Database =
lusitania
+------------------+---------------------------------------------+
| Relation | Grant/Revoke Permissions |
+------------------+---------------------------------------------+
| mytable |
{"=rw","miriam=arwR","group
todos=rw"} |
+------------------+---------------------------------------------+
Legend:
uname=arwR -- privileges granted to a user
group gname=arwR -- privileges granted to a GROUP
=arwR -- privileges granted to PUBLIC
r -- SELECT
w -- UPDATE/DELETE
a -- INSERT
R -- RULE
arwR -- ALL
Tip: Currently, to create a GROUP you have to insert data manually into table pg_group as:
INSERT INTO
pg_group VALUES (’todos’);
CREATE USER miriam IN GROUP todos;
Refer to REVOKE statements to revoke access privileges.
Grant insert privilege to all users on table films:
GRANT INSERT ON films TO PUBLIC;
Grant all privileges to user manuel on view kinds:
GRANT ALL ON kinds TO manuel;
SQL92
The SQL92 syntax for GRANT allows setting privileges for
individual columns within a table, and allows setting a
privilege to grant the same privileges to others:
GRANT
privilege [, ...]
ON object [ ( column [, ...] ) ] [, ...]
TO { PUBLIC | username [, ...] } [ WITH GRANT OPTION
]
Fields are
compatible with the those in the Postgres implementation,
with the following additions:
privilege
SQL92 permits additional privileges to be specified:
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SELECT |
REFERENCES
Allowed to reference some or all of the columns of a specific table/view in integrity constraints.
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USAGE |
Allowed to use a domain, character set, collation or translation. If an object specifies anything other than a table/view, privilege must specify only USAGE. | ||
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object |
[ TABLE ] table
SQL92 allows the additional non-functional keyword TABLE.
CHARACTER SET
Allowed to use the specified character set.
COLLATION
Allowed to use the specified collation sequence.
TRANSLATION
Allowed to use the specified character set translation.
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DOMAIN |
Allowed to use the specified domain. |
WITH GRANT OPTION
Allowed to grant the same privilege to others.
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grant(l) | |