Creating a New Database in .NET

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Creating a New Database
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The first step for the application is to create a new database object While you can use the standard postgres database object to hold the application data, it is usually best programming practice to create a separate database object that contains your applications Remember, each client connection to the PostgreSQL server can connect to only one database object By using a separate database object for your applications, you help isolate application users from the system tables To create the new database, first start pgAdmin III and log into your PostgreSQL server Right-click the Databases object and select New Database from the menu The New Database window, shown in Figure 4-3, appears
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Figure 4-3 The New Database window
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The New Database window contains four tabs for entering information for the new database The Properties tab contains a form for entering the required information to create the new database The Variables tab is a generic tab used in pgAdmin III, but does not apply to the New Database function By default, only the database owner will be able to create or modify objects in the database The Privileges tab allows you to assign privileges to other Group Roles configured in the PostgreSQL server The SQL tab shows the SQL statement generated by your selected options in the other tabs to create the database Creating a new database uses the CREATE DATABASE SQL statement pgAdmin III fills in the appropriate statement parameters for you automatically based on your entries in the configuration tabs Go to the Properties tab and assign a name to your new database (for this example, I use the database name test) You must select an owner for your database At this point, you might not have any users other than the postgres superuser created on your server,
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so you can make that user the owner of the database Remember, the database owner has complete control over all objects in the database You never want to make a normal database user owner of the entire application database After entering the database owner, you must select the encoding to use for the database By default, pgAdmin III uses the SQL_ASCII encoding The ASCII character set is an old 7-bit character set that has been around almost since the dawn of computers This value has worked fine for simple, English-language databases However, if you plan on creating tables that contain advanced data types or using languages with more complicated character sets, the 7-bit ASCII character set will not work You need to use a full 8-bit character encoding In the past this has been a problem with running PostgreSQL on Windows However, since version 81, PostgreSQL supports the UTF8 encoding format on Windows systems If you are not sure what type of data your application will ultimately hold, it is always safest to use the UTF8 encoding The next setting on Properties tab is the template to use to create the new database If this is the first database you have created, all that will be available to you are the template0 and template1 templates As you create new databases, pgAdmin III provides those to be used as templates as well For now you can use the template1 template to create your new database After the template choice comes the tablespace In most situations, you should use the pg_default tablespace for your new database Although pgAdmin III offers the pg_global tablespace as an option, you should never create new objects in the pg_ global tablespace It is generally not a good idea to mix your application objects with the system objects If you had created a new tablespace on your system, it would also appear in the list of options available The Comment section is another area that does not apply to creating databases PostgreSQL allows you to add comments to many objects when they are created, but databases are not one of them After filling out the Properties tab, look at the SQL tab It contains the complete SQL statement used to create the database This is shown in Figure 4-4 The CREATE DATABASE SQL statement (see Figure 4-4) is what pgAdmin III runs to create the new database In 6, you will learn how to manually create and enter these types of SQL commands However, with pgAdmin III it is as easy as filling out a form and clicking a button Speaking of clicking a button, go back to the Properties tab and, if it is complete, click the OK button PostgreSQL will create the new database object, which then appears in your pgAdmin III main window object listing By default, you are not connected to the new database object, so it is shown with a red X over it Clicking the new object connects you to the database and expands the database object in the window
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