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Table 4-1 Schema Objects in PostgreSQL
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A database can contain several different schemas, each with its own set of tables, triggers, functions, and views While users can only access objects within one database at a time, they can access all of the schemas within that database (restricted by assigned privileges) Sometimes related applications can share the same database, but use different schemas to hold their separate data This makes it easier for users to find data tables related to the applications within the database This is especially true if tables have the same names Table names must be unique within a schema, but can be duplicated between schemas Tables are referenced in SQL statements using the format:
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schemanametablename
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This format specifies exactly which table in which schema is being accessed Depending on your naming conventions, this format can become quite cumbersome However, PostgreSQL provides a shortcut for us Much like a Windows PATH environment variable, PostgreSQL uses the search_ path variable for defining default schema names If you specify a table name alone within a SQL statement, PostgreSQL attempts to find the table by searching the schemas in your search_path In 6, you will see how you can set your search_path variable for your particular schema configuration The schema objects created in a new database are based on the template used to create the database By default, the template0 and template1 templates contain a schema called public By default, all user accounts that have permission to a database have permission to create and access objects in the public schema Most applications do not use the public schema, but instead create their own schemas to control data used in the application You will see how to do that in the Creating a New Schema section later on in this chapter
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Group Roles
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Group Roles are used to create access permissions for groups of users While you can grant an individual user account access directly to a database object, the preferred method is to use Group Roles (in fact, pgAdmin III only allows you to grant Group Roles access to database objects) A Group Role is not allowed to log into the PostgreSQL server, but controls access for user accounts that do log in Group Roles are defined at the PostgreSQL server level and used by all databases controlled by the PostgreSQL server By default, there is one Group Role configured in PostgreSQL The public group role applies to all users on the PostgreSQL system You are not able to remove any user account from the public Group Role Because of this, the public Group Role does not appear in the pgAdmin III Group Roles listing You can create your own Group Roles using pgAdmin III to control access to your application schemas and tables This process is described in detail in the Working with User Accounts section later in this chapter
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4:
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Login Roles
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Login Roles are roles that are allowed to log into the PostgreSQL server They are also known as user accounts The Login Roles section is where you define accounts for individual users for the PostgreSQL system Each database user should have an individual account for logging into the PostgreSQL system That account is then assigned as a member of the appropriate Group Roles that grant privileges to the database objects required In a large database environment, this allows you to easily change access for database objects without having to touch hundreds (or even thousands) of individual user Login Roles
CREATING A NEW APPLICATION
Now that we have looked into the different parts within the PostgreSQL system, it is time to start working with them To help demonstrate managing a database application using pgAdmin III, this section walks through creating a simple application environment It uses the store example described in 1 In this example we will create a new database for the application and a new schema to control access to the data Within the schema, we will create three tables to hold the data required for the store: Customer Contains information on the store customers Product Contains information on the products the store sells Order Contains information on orders placed by customers To control access to the data, we will create two Group Roles The Salesman Group Role will be given write permission on the Customer and Order tables, but only read permission on the Product table The Accountant Group Role will be given write permission on the Product and Order tables, and read permission on the Customer table To round out our application, we will create two Login Roles Our store will consist of a salesman, called Barney, and an accountant, called Fred The following sections create our new store application
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