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PostgreSQL 8 for Windows
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Figure 4-14 The Customer Table Privileges tab
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Next, do the same for the Accountant Group Role, assigning them only SELECT privileges for the table When you have finished, do the same for the Product table, assigning INSERT, SELECT, UPDATE, and DELETE privileges for the Accountant role, and only SELECT privileges for the Salesman role Finally, assign privileges for the Order table, giving both the Salesman and Accountant roles INSERT, SELECT, UPDATE, and DELETE privileges Now that you have all of the table privileges created, you might think that you are done Unfortunately that is not the case There is one more privilege you need to address As a security feature, a newly created schema does not grant any privileges to any groups (not even the public group) Only the superuser (postgres by default) has privileges to modify the schema By default, pgAdmin III does not show individual user privileges in the listing until after you add group privileges, so you will not see the postgres user privileges displayed You must specify if your new Group Roles should have access to the store schema Double-click the store schema in pgAdmin III, then
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Managing PostgreSQL on Windows
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Privilege INSERT (append) SELECT (read) UPDATE (write) DELETE RULE REFERENCES TRIGGER EXECUTE USAGE CREATE TEMPORARY
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Table 4-6 pgAdmin Object Privilege Codes
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click the Privileges tab You should not see any group privileges shown for the schema Select the group to add privileges for from the drop-down menu The USAGE privilege allows the group to use existing objects in the schema The CREATE privilege allows groups to create new objects in the schema You must add the USAGE privilege to both the Salesman and Accountant Group Roles for those users to have access to objects in the schema Just select the appropriate Group Role from the drop-down menu, check the USAGE check box, and click the Add/Change button When you are done, click OK Now your application should be all set for user accounts
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Now that you have created a security environment, you can start creating user accounts and assigning them to Group Roles In PostgreSQL, user accounts are called Login Roles Right-click the Login Roles entry in pgAdmin III and select New Login Role The New Login Role window appears, as shown in Figure 4-15 As expected, on the Properties tab, you need to fill in the role name (user account name) that will be used to log into the server, and assign a password for the account (do not create Login Role accounts without passwords) If needed, you can also set an expiration date for the account
PostgreSQL 8 for Windows
Figure 4-15 The New Login Role window
In the Role Privileges section, you must select the Inherits Rights from Parent Roles check box This ensures that the Login Role will inherit the privileges assigned to the Group Role it is assigned to After filling in the Properties tab, click the Role Membership tab This is where you assign the Login Role to one or more Group Roles For a Salesman account, click the Salesman group name in the left box and click the right arrows The Salesman group name is added to the Member In list To complete this example, create two Login Roles, user barney and user fred Add barney to the Salesman group and add fred to the Accountant group While it is not necessary, it is best practice to create Login Roles using all lowercase letters As mentioned before, PostgreSQL is case sensitive in all things, so creating a Login Role Barney can result in future problems if the user does not remember to capitalize the first letter Using all lower case letters is a standard practice on database systems
4:
Managing PostgreSQL on Windows
Testing Privileges
You can now test your new user environment by logging into the PostgreSQL server using the newly created Login Roles The easiest way to do that is to use the psql program 5 describes this program in great detail, but for now we will just use it to see if we can get to the new tables The easiest way to start the psql program is to choose Start | Programs | PostgreSQL 82 | Command Prompt This creates a command prompt window in the default bin directory of PostgreSQL, where all of the utilities are located From here you can run the psql command-line program There are lots of command-line options for psql (as you will see in 5) For now we will just use a basic format:
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