Databases in VS .NET

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Databases
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Databases are the core objects in PostgreSQL They hold all of the data objects used in PostgreSQL When a user account connects to a PostgreSQL server, it connects to a database object, and has access to all the objects contained within the database, restricted by the privileges that are granted on the objects A user account can only access objects within a single database in a single connection You cannot access objects in two separate databases in one connection Of course, there is no restriction as to how many database connections a single user can have within an application at the same time, but each individual connection can only be connected to a single database A PostgreSQL system can (and usually does) have multiple databases defined on the system The default database created during the PostgreSQL installation (or when you use the initdb command) is called postgres The postgres database contains the default system tables for handling the internal PostgreSQL Data Dictionary These tables are not shown in pgAdmin III, but can be accessed via SQL queries There are two additional databases that are configured by default in PostgreSQL, but not shown in pgAdmin III: template0 and template1 These are, as their names suggest, generic templates that are used to create new databases Values assigned to these templates (such as the tablespace location and database owner) are assigned to new databases created using the template As you will see in the Creating a New Database section later in this chapter, the pgAdmin III interface allows you to choose any database to base a newly created database on The difference between template0 and template1 is that template1 can be modified If you need to create lots of database objects with certain features or objects, you can modify the template1 database template to include the features and objects, then use it as the master template to create all of your new databases Each new database will have the same features and objects as the template1 database template The template0 database template cannot be modified and always describes a generic PostgreSQL database object This template uses the pg_default tablespace, and any new databases created with this template will always use the pg_default tablespace As you can see from the pgAdmin III display (shown in Figure 4-2), each database object contains four types of objects: Casts Languages
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Replications Schemas Casts allow you to specify conversions from one data type to another Once a cast is defined, it is active for the entire database and can be used in any table object defined in the database Casts are often used to create unique data types for a database By default there are no casts defined in the database Languages define procedural programming languages that can be used for functions and triggers within the database In 2, you had the opportunity to install new procedural languages at installation time Replications define copies (or replicas) of the PostgreSQL database in a fault-tolerant operation PostgreSQL uses an add-on package called Slony-I to control database replicas distributed among remote servers This is not part of the standard PostgreSQL package Schemas are the most important objects within the database As you can see from Figure 4-2, a schema contains the tables, triggers, functions, views, and other objects for handling data in the database Table 4-1 describes the different objects contained within a schema
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Description Defines functions that produce results based on processing input values from multiple records in a table (such as a sum or average) Defines conversions between character set encodings User-defined data types User-defined functions User-defined table triggers User-defined functions that manipulate data but do not return a value User-defined operators used to compare data Defines how a data type can be used within an index Defines a sequenced number generator User-created data repositories User-defined data types used in the database User-created queries combining data from multiple tables
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Conversions Domains Functions Trigger Functions Procedures Operators Operator Classes Sequences Tables Types Views
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