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The cron service is activated by default. It checks its configuration files every minute to see if something needs to be done. The cron process looks for configuration data in different places: The generic file /etc/crontab can contain lines that tell cron when to execute a given command. In the directory /etc/cron.d, an administrator can put a file that defines what should happen, and when. Every user can have its own cron configuration file, telling the system when to execute certain tasks. The directories /etc/cron.hourly, cron.daily, cron.weekly, and cron.monthly are used to activate jobs once an hour, a day, a week, or a month, respectively. These directories contain files that are activated every hour, day, week, or month. Working with the cron time activation mechanisms makes it very easy for an administrator to start jobs on a regular basis. The scripts in these directories are just regular shell scripts that make sure the job gets done. So all you have to do is include a shell script that activates

You created a SqlCommand object using the default constructor, and printed a message indicating you d created it:

WHERE extension BETWEEN 400 AND 500 returns the rows where Extension is between 400 and 500, inclusive. WHERE city IN ('Seattle', 'London') returns the rows where City is either Seattle or London.

' Create command Dim cmd as SqlCommand = new SqlCommand() Console.WriteLine("Command created.")

the job you want to start. These scripts can be very simple: just a line that starts the service is enough.

Quite often you ll need to use more than one predicate to filter your data. You can use the logical operators shown in Table 5-6. Table 5-6. SQL Logical Operators

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In this example, the command is empty. It isn t associated with a connection, and it doesn t have its text (in other words, the SQL) set. You can t do much with it here, so let s move on and see how you can associate a command with a connection.

Note Some daemons need to be restarted to make sure that changes are activated, but this isn t true for

For your commands to be executed against a database, each command must be associated with a connection to the database. You do this by setting the Connection property of the command, and in order to save resources, multiple commands can use the same connection. You have a couple of ways to set up this association, so let s modify our example to try them.

Combines two expressions, evaluating the complete expression as true only if both are true Negates a Boolean value Combines two expressions, evaluating the complete expression as true if either is true

To set the Connection property: 1. Add the following bold code to the Try block of Listing 6-1.

You can set up your system to allow individual users to start their cron jobs. Such a configuration starts with the files /etc/cron.allow and /etc/cron.deny. A user who is listed in /etc/cron.allow or who isn t listed in /etc/cron.deny is capable of adding cron jobs. If /etc/cron.allow exists, only this file is evaluated and settings in /etc/cron.deny are ignored. If both files don t exist, only root can create cron jobs. The cron configuration files for individual users are stored in the directory /var/spool/crontabs. The crontab command can be used to edit this file. Next we ll look at some examples of the crontab command in action.

Try ' Open connection conn.Open() ' Connect command to connection cmd.Connection = conn Console.WriteLine("Connected command to this connection.")

HERE (title LIKE 'Sales%' AND lastname ='Peacock') WHERE NOT (title LIKE 'Sales%' AND lastname ='Peacock') WHERE (title = 'Peacock' OR title = 'King')

Note By default, the crontab command uses the nano editor to do its work. The problem with nano,

2. Run it with Ctrl+F5. You should see the result in Figure 6-2.

however, is that it doesn t by default write its configuration files to the right location. To fix this, as root add the following line to the end of /etc/profile: export VISUAL=vim. After logging in again, vim will be used as the default editor for crontab and some other editor-related commands as well. The advantage The right file will be created at the right location automatically.

As you saw in the previous example, you started the code by creating the connection and command:

When you use these operators, it s often a good idea to use parentheses to clarify the conditions. In complex queries, this may be absolutely necessary.

' Create connection Dim conn As SqlConnection = New SqlConnection(connString) ' Create command Dim cmd as SqlCommand = new SqlCommand() Console.WriteLine("Command created.")

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