WORKING WITH USER ACCOUNTS in .NET framework

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If you have been following the exercise in this chapter on your own computer, you have the makings of a real application However, there is one important piece still missing
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So far you have been accessing your tables using just the postgres superuser account While this works okay in development, this is a major no-no in the production world In the real world, you want each of the database users to have their own Login Roles (user accounts) assigned to them This ensures that you can track database activity down to the individual user You also want to create Group Roles to grant permissions to tables based on functions performed, then assign the individual Login Roles to the appropriate Group Roles This allows you to move user Login Roles around between tables without having to mess with individual privileges This section walks through the steps required to set up a simple user environment for the test database created
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Creating Group Roles
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The first step toward implementing a secure database environment is to create Group Roles to control access to your data tables In this example, we will use two Group Roles to control access: Salesman Has write access to the Customer and Order tables, and read access to the Product table Accountant Has write access to the Product and Order tables, and read access to the Customer table To create a new Group Role, right-click the Group Roles entry in the pgAdmin III window and select New Group Role The New Group Role window, shown in Figure 4-13, appears By now you should be familiar with the drill In the window, there is a simple form on the Properties tab to fill out the information pertinent to the Group Role you want to create Group Roles do not have login privileges, so you do not need to create a password for the role (although PostgreSQL allows you to if you want to) For these Group Roles, you also do not need to check any of the check boxes in the Role Privileges area of the Properties tab We obviously do not want the members of this group to be superusers, and there will not be any objects or roles that these users need to create You can cascade Group Roles, assigning one group as a member of another group, and allowing it to inherit all of the permissions assigned to the parent group We will not get that complicated in this simple example You also have the option of setting a date when the group will expire This is convenient for setting up temporary testing groups for applications Go ahead and create the Salesman and Accountant roles using the New Group Role window You should see the new roles added to the PostgreSQL system as you create them After creating the new Group Roles, you must assign the proper permissions to the tables for them This is done in the individual Table Properties windows
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Figure 4-13 The New Group Role window
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Double-click the Customer table icon in pgAdmin III The Table Properties window appears for the table Click the Privileges tab, showing the configuration window to set permissions on the table, shown in Figure 4-14 In the lower section, you must select the role to grant permissions for Select the Salesman Group Role Next, select the permissions you want to grant for that Group Role For the Salesman role, we want to grant them INSERT, SELECT, UPDATE, and DELETE privileges, so check those check boxes The WITH GRANT OPTION check box allows members in the Group Role to reassign the same privileges to other users We do not want our users going behind our backs and giving other users privileges to the tables, so leave those check boxes empty When you are done, click the Add/Change button to assign the selected privileges You will see the Salesman Group Role name added to the list in the top frame, along with a code showing the privileges assigned The codes are shorthand for the privileges set Table 4-6 shows the codes that are used
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