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You can use while to run a command as long as a condition is met. Listing 7-27 shows how while is used to monitor activity of an important process. Listing 7-27. Monitoring Process Activity with while #!/bin/bash # # usage: monitor <processname> while ps aux | grep $1 do sleep 1 done logger $1 is no longer present The body of this script consists of the command ps aux | grep $1. This command monitors for the availability of the process whose name was entered as an argument when starting the script. As long as the process is detected, the condition is met and the commands in the loop are executed. In this case, the script waits 1 second and then repeats its action. When the process is no longer detected, the logger command writes a message to syslog. As you can see from this example, while offers an excellent method to check if something (such as a process or an IP address) still exists. If you combine it with the sleep command, you can start your script with while as a kind of daemon and perform a check repeatedly. For example, the script in Listing 7-28 would write a message to syslog if due to an error the IP address suddenly gets lost. Listing 7-28. Checking if the IP Address Is Still There #!/bin/bash # # script that monitors an IP address # usage: ipmon <ip-address> while ip a s | grep $1/ > /dev/null do sleep 5 done logger HELP, the IP address $1 is gone.

Spring provides support for the annotations of a third-party library, AspectJ. AspectJ annotations allow you to express the pointcut definitions, the advices relationships with the pointcuts, and the aspect implementation all within the class implementation files. The major advantage of this technique is that this configuration information can be picked up purely by adding the <aop:aspectj-autoproxy/> element to the configuration file. Conversely, this can be a disadvantage if the user expects to have more visibility on the configuration and it s hidden away in an implementation file. Listing 5-25 shows the implementation of our timesheet security advice class with suitable annotations to apply the same rules as were specified in Listing 5-22. The initial set of five private methods in Listing 5-25 are provided purely as places to define the pointcuts.

WITH <cteName1> AS (SELECT <col1> FROM <table1>), <cteName2> AS (SELECT <col2> FROM <table2>), <cteName3> AS (SELECT <col3> FROM <table3>) SELECT <col1>, <col2>, <col3> FROM <cteName1> INNER JOIN <cteName2> ON <join condition1> INNER JOIN <cteName3> ON <join condition2> Of course, your CTE definitions can contain just about any valid SELECT statement, and your outer query can use the CTEs in any way you need to use them. Type in and execute Listing 10-1 to learn more. Listing 10-1. A Query with Multiple Queries in a CTE USE AdventureWorks; GO WITH Emp AS( SELECT e.EmployeeID, e.ManagerID,e.Title AS EmpTitle, c.FirstName + ISNULL(' ' + c.MiddleName,'') + ' ' + c.LastName AS EmpName FROM HumanResources.Employee AS e INNER JOIN Person.Contact AS c ON e.ContactID = c.ContactID ), Mgr AS( SELECT e.EmployeeID AS ManagerID,e.Title AS MgrTitle, c.FirstName + ISNULL(' ' + c.MiddleName,'') + ' ' + c.LastName AS MgrName FROM HumanResources.Employee AS e INNER JOIN Person.Contact AS c ON e.ContactID = c.ContactID ) SELECT EmployeeID, Emp.ManagerID, EmpName, EmpTitle, MgrName, MgrTitle FROM Emp INNER JOIN Mgr ON Emp.ManagerID = Mgr.ManagerID ORDER BY EmployeeID; Figure 10-1 shows the partial results. Each CTE must have a name, followed by the keyword AS and the definition in parentheses. Separate the CTE definitions with a comma. This query, from the AdventureWorks database, contains a CTE for the employees, Emp, and a CTE for the managers, Mgr. Within each CTE, the HumanResources.Employee table joins the Person.Contact table. By writing the query using CTEs, the outer query is very simple. You just join the Mgr CTE to the Emp CTE just as if they were regular tables or views.

Whereas while does its work as long as a certain condition is met, until is used for the opposite: it runs until the condition is met. This can be seen in Listing 7-29 where the script monitors if the user, whose name is entered as the argument, is logged in.