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Next, start PostgreSQL for the first time and have it create its own data directory, which contains its system tables and configurations. To do this, enter service postgresql start The data directory will be created in /var/lib/pgsql/data. The PostgreSQL server process called postmaster will then listen to database connections on port 5432, its default.

events[2] = events[0];

causes the third element to refer to the same object as the first. This doesn t modify the object that element previously referenced. (It might cause the object to become inaccessible, though if nothing else has a reference to that object, overwriting the array element that referred to it means the program no longer has any way of getting hold of that object, and so the .NET Framework can reclaim the memory it occupies during the next garbage collection cycle.) It s often tempting to talk in terms of the fourth object in the array, and in a lot of cases, that s a perfectly reasonable approximation in practice. As long as you re aware that with reference types, array elements contain references, not objects, and that what you really mean is the object referred to by the fourth element in the array you won t get any nasty surprises. Regardless of what element type you choose for an array, all arrays provide various useful methods and properties.

An array is an object in its own right; distinct from any objects its elements may refer to. And like any object, it has a type as you ve already seen, we write an array type as SomeType[]. Whatever type SomeType may be, its corresponding array type, Some Type[], will derive from a standard built-in type called Array, defined in the System namespace. The Array base class provides a variety of services for working with arrays. It can help you find interesting items in an array. It can reorder the elements, or move information between arrays. And there are methods for working with the array s size.

PostgreSQL administration can be done using its command-line client called psql, which creates the interactive terminal. With the interactive terminal, you can create database objects such as users and tables as needed. But be warned, you need to be logged in as the real postgres system user before you can use it. The root system user is not available on the default PostgreSQL installation. The syntax of psql is psql [ U target_user] [ h target_host] target_database where target_user is the user we want to connect with. The target_host can be a valid host name or IP address of the PostgreSQL server we need to connect. The target_database is the name of the database.

o far this book has covered the basics of workflow, all the out-of-the-box activities, and discussed designing workflows. Once a workflow application is constructed, it must be deployed. This chapter will cover how best to deploy a workflow application. This chapter will also cover how to persist workflow data so multiple users can use the same workflow.

Suppose we want to find out if an array of calendar items contains any events that start on a particular date. An obvious way to do this would be to write a loop that iterates through all of the elements in the array, looking at each date in turn (see Example 7-13).

DateTime dateOfInterest = new DateTime (2009, 7, 12); foreach (CalendarEvent item in events) { if (item.StartTime.Date == dateOfInterest) { Console.WriteLine(item.Title + ": " + item.StartTime);

In this exercise you will try the Postgres interactive terminal on the default system database as the postgres user. Assume that you are logged as the root user. Change into postgres by issuing su - postgres Run the next command to enter the interactive terminal: psql template1 This command will connect you locally to the PostgreSQL system database, called template1. After a successful connection your terminal should look like Figure 12-4.

}

}

Example 7-13 relies on a useful feature of the DateTimeOffset type that makes it easy to work out whether two DateTimeOffset values fall on the same day, regardless of the exact time. The Date property returns a DateTime in which the year, month, and day are copied over, but the time of day is set to the default time of midnight.

Figure 12-4. The PostgreSQL interactive terminal connected to the template1 database With the interactive terminal, you can now run queries as PostgreSQL s postgres user.

Although Example 7-13 works just fine, the Array class provides an alternative: its FindAll method builds a new array containing only those elements in the original array that match whatever criteria you specify. Example 7-14 uses this method to do the same job as Example 7-13.

DateTime dateOfInterest = new DateTime (2009, 7, 12); CalendarEvent[] itemsOnDateOfInterest = Array.FindAll(events, e => e.StartTime.Date == dateOfInterest); foreach (CalendarEvent item in itemsOnDateOfInterest) { Console.WriteLine(item.Title + ": " + item.StartTime); }