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VALID UNTIL date Specify a date when the role will expire
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Table 6-4 The CREATE ROLE SQL Command Options
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Using Basic SQL
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By default, the CREATE ROLE command uses the NOLOGIN option to create a Group Role (although it also does not hurt to specify it) Remember, you must have superuser privileges to create new roles in the database This is a job usually done with the postgres user account:
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test2=# create role management with nologin; CREATE ROLE test2=# create role technician nologin; CREATE ROLE test2=#
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Notice that the WITH keyword is optional in the command If it makes things easier for you, go ahead and use it To create a new Login Role, the command can get somewhat complex Just as in creating tables, you can also use the ALTER ROLE command to help break up the options Unfortunately, you cannot use the IN ROLE option in the ALTER TABLE command, so that must be entered in the CREATE ROLE command:
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test2=# create role wilma in role management; CREATE ROLE test2=# alter role wilma login password 'pebbles' inherit; ALTER ROLE test2=# create role betty in role technician; CREATE ROLE test2=# alter role betty login password 'bambam' inherit; ALTER ROLE test2=# \du wilma List of roles Role name | Superuser | Create role | Create DB | Connections | Member of + + + + + wilma | no | no | no | no limit | {management} (1 row) test2=#
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The INHERIT parameter tells PostgreSQL to allow the Login Roles to inherit any privileges assigned to the Group Roles they belong to If you need to remove any Login or Group Roles, you can use the DROP ROLE command However, PostgreSQL will not let you remove a role if it is the owner of any database objects, such as schemas or tables You must perform an ALTER command to change the owner of the object to another role
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Now that you have some Login and Group Roles created, it is time to assign privileges to database objects In the SQL language, the command to assign privileges is GRANT:
GRANT privlist ON object TO roles
PostgreSQL 8 for Windows
The privlist parameter contains a list of the privileges you want roles to have on the object object Granting privileges can be a complex function to perform There are two types of GRANT commands, depending on what the object specified in the command is: Granting privileges to database objects Granting privileges to role objects
Granting Privileges to Database Objects
Granting privileges to database objects involves allowing Login and Group Roles to create, access, and modify the object Table 6-5 lists and describes the privileges that can be assigned to database objects
Database Object Privilege ALL PRIVILEGES CREATE
Description Allow role to have all privileges to the specified object Allow role to create schemas within a specified database, or create tables, views, functions, and triggers within a specified schema Allow role to remove data from a row in a specified table object Allow role to run a specified function object Allow role to insert data into a specified table object Allow role to create a foreign key constraint in a table object Allow role to create rules for a specified table object Allow role to query columns to retrieve data from the table object Allow role to create temporary table objects Allow role to create a trigger on the specified table object Allow role to modify any column within a specified table object Allow role to use a specified language, or access objects contained in a specified schema
DELETE EXECUTE INSERT REFERENCES RULE SELECT TEMPORARY TRIGGER UPDATE USAGE
Table 6-5 GRANT Command Database Object Privileges
6:
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When using the GRANT command on database objects, by default the command assumes you are using table objects If you are granting privileges to any other database object, you must specify the object type before the object name:
test2=# grant usage on schema store to management; GRANT test2=#
This is an extremely important privilege that many novice administrators overlook It is easy to get caught up in figuring out privileges for tables and forget to give your users access to the schema If you forget to do that, even with table privileges their SQL commands will fail! Once your users have access to the schema, you can start granting privileges to individual tables for your Group Roles:
test2=# grant select, insert, update on store"Customer" to management; GRANT test2=# grant select on store"Customer" to technician; GRANT test2=#
To see the assigned privileges for a table, use the \z meta-command:
test2=# \z store"Customer" Access privileges for database "test2" Schema | Name | Type | Access privileges + + + store | Customer | table | {fred=arwdRxt/fred,management=arw/fred, technician=r/fred} (1 row) test2=#
The \z command shows all of the roles that have been assigned privileges for the table, along with the privilege codes (described in 4) The Login Role listed after the privilege is the one who granted the privileges To grant a privilege to all users on the system, use the special public Group Role:
test2=# grant select on store"Customer" to public; GRANT test2=#
Now all users on the system have the ability to query data from the Customer table If you try to view the privileges for the table, you may be confused by what you now see Instead of seeing an entry for public, you will see an entry with no name, assigned the r privilege:
{fred=arwdRxt/fred,management=arw/fred,technician=r/fred,=r/fred}
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