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Most of the time, you want to select methods based on some of their parts, such as the name, return type, throws declaration, or arguments. When selecting based on method parts, you will use the execution() or args() pointcut designators or a combination of these designators.

The value returned is either PortletSession.PORTLET_SCOPE or PortletSession.APPLICATION_SCOPE. Both of these methods look at the name of the attribute to determine if it starts with the portlet scope namespace, which is javax.portlet.p .

sql_query($sql)

4

mysql_query()

Portlets communicate with other portlets in the same portlet application through the user s portlet session In the initial version of the portlet API, this is the only available interportlet communication functionality Portal vendors may offer a proprietary way to pass messages or events between portlets Future versions of the portlet API will probably provide a standard for communication If we have one portlet that has a list of employees, and another portlet that displays their insurance information, the portlets will share a reference to the current employee in the session Both portlets must be in the same portlet application to share the session We will create a simple content browser tool that consists of two portlets One will display a set of topics, and the other will display content.

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The simplest way to select methods is by narrowing down the selection based on their names. Listing 4-40 shows a pointcut that selects all relax(), enjoy(), and chillOut() methods. Listing 4-40. Selecting Some Enjoyable Methods package com.apress.springbook.chapter04.aspects; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Pointcut; @Aspect public class SystemPointcutsAspect { @Pointcut("execution(* relax(..)) || execution(* enjoy(..)) || " + "execution(* chillOut(..))") public void goodTimes() {} } Each execution() pointcut designator in Listing 4-40 selects methods based on their names, regardless of all other properties. You can also use wildcards in method names. Listing 4-41 shows a pointcut that selects all methods whose names start with do. Listing 4-41. Selecting All Methods Whose Names Start with do package com.apress.springbook.chapter04.aspects; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Pointcut; @Aspect public class SystemPointcutsAspect { @Pointcut("execution(* do*(..))") public void performAction() {} }

Runs a query on your database using SQL statements defined in $sql. Returns the result of the query if it is successful, and false if a failure occurred. Returns a row of data as requested in the result of sql_query(), or false if a failure occurred. Use this function when you expect only one row of results. The data returned by sql_fetchrow() is an array indexed by field name. For example, to access the field user_name in the returned variable foo, use the notation $foo['user_name']. Works just like sql_fetchrow(), except it returns a multidimensional array containing multiple rows of data. Access the data returned by sql_fetchrowset() by using the notation $foo[$i]['field_name'], where $i is the number (starting with zero) of the result you wish to access. For example, to access the third result of a query on usernames, use the notation $foo[2]['user_name']. Clears out the result of a query and enables you to start fresh. This is a good cleanup method to use, particularly after a large query, to help free memory and keep things running smoothly. Simply pass a result from sql_query() into the function to make it work. Returns true if successful, and false if a failure occurred.

When the user clicks on a link in the topic browser, the portal page will refresh, the portal sends an action request to the topic portlet, and then the portal sends render requests to all of the portlets on the page The topic portlet reads the id parameter from the action URL when the portlet processes the action request The portlet then places the id parameter in the portlet session as the contentId parameter in the application scope We named them differently here to make it clear that the parameter on the action request is distinct from the parameter on the portlet session The render request and the other portlets in the portlet application do not have access to the action request parameters There are three key points to remember for interportlet communication using sessions: The portlet places the parameters in the session s application scope.

sql_fetchrow($query_id)

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