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If you are creating your PostgreSQL database in a production environment, most likely you will need to interface it with application programs Different application development environments require different methods to interface with the PostgreSQL database PostgreSQL provides a few drivers to support the following interfaces: JDBC Npgsql ODBC OLEDB If you plan to work in a Java development environment, the Java Database Connectivity (JDBC) driver allows your Java applications to connect to the PostgreSQL database and perform database transactions Similarly, the Npgsql driver allows applications created in Microsoft s NET environment to connect to PostgreSQL The ODBC and Object Linking and Embedding Database (OLEDB) drivers interface legacy Microsoft applications, including Microsoft Access, with the PostgreSQL database
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Part III, Windows Programming with PostgreSQL, demonstrates how to use each of these drivers in their respective development environments If you plan to follow along in this section, you need to install these drivers if they are not already installed All of these drivers are installed by default If you decide you do not want to use any of these drivers, you can choose not to install them They can be individually installed later on if you need them
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The development install packages include libraries and header files for use with various development environments If you plan on developing C or C++ applications for PostgreSQL (as covered in 13), you need to include the development packages in your installation If you choose not to install any of the features during the initial installation process, you can always rerun the PostgreSQL installer and select just the options you did not install the first time
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After selecting the appropriate installation pieces, click Next to continue with the installation The Service Configuration window allows you to configure how PostgreSQL is started on your Windows system Figure 2-4 shows how the window appears
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Figure 2-4 The PostgreSQL Service Configuration window
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PostgreSQL 8 for Windows
There are two methods you can use to run PostgreSQL on your Windows system: As a background service As a normal program The PostgreSQL installation process provides an easy way for you to create a PostgreSQL background service on your Windows system Checking the Install as a Service check box allows the PostgreSQL installer to create the necessary service objects on the Windows system This method allows PostgreSQL to automatically start when the system is booted This is almost always the preferred method of running PostgreSQL on servers It also comes in handy if you are doing development work on your workstation If you are just playing around with PostgreSQL on your workstation, you might not want it to load every time you turn on your system In that case, choose to not install PostgreSQL as a service (clear the check box) The Service Configuration window allows you to customize the way the service runs You can specify the name of the service, as well as the user account used to run the service If the user account does not exist on the system, the installer will attempt to create it The default account PostgreSQL will create is called postgres There is one word of caution if you run PostgreSQL as a service To support strict security requirements, PostgreSQL will not allow itself to be started by a user account that has administrator privileges This blocks hackers from utilizing the PostgreSQL program to gain uncontrolled access to the Windows system The postgres user account created has limited privileges on the system When you have completed your selections for the Services Configuration window, click Next to move on in the installation
Initialise Database Cluster Window
If you chose to install PostgreSQL as a service, the installer next provides an easy method for you to create a default database for your system This is done in the Initialise Database Cluster window, shown in Figure 2-5 This section makes creating a new database simple Unless you are an advanced PostgreSQL administrator, it is easiest to create the default database now using this window If you decide to create a database, there are a few parameters you must set for PostgreSQL in the Initialise Database Cluster window The first two parameters are related to the network connectivity for the database The Port Number parameter assigns a specific TCP port to the PostgreSQL server so that applications can connect to send queries The default value for the PostgreSQL port is 5432, as shown in Figure 2-5 You can elect to change this value, but it is important that you remember the new value you assign, as it must be used for all communications with the PostgreSQL system The Addresses parameter specifies whether you want the PostgreSQL system to accept connections only from applications running on the local Windows system This prevents network access to the database Checking the check box allows PostgreSQL to
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