A 


queryCreateRows


 action must be enclosed in a 


queryBlock


 action. A 


queryCreateRows


 action will iterate over the results of the last executed query and will 


generate up to as many rows as requested.


A 


queryDisplay


action must be enclosed in a 


queryCreateRows


 action. A 


queryDisplay


 action will access the requested field from the current iteration in 


queryCreateRows


 and insert the value into the out object.


FIGURE 1 2 


A JSP page using custom actions




<%@ taglib uri= http://acme.com/taglibs/simpleDB.tld  prefix= x  %>






SELECT ACCOUNT, BALANCE FROM ...




The top 10 accounts and balances are:




ACCOUNTBALANCE













In this example:


The x:queryCreateRows action implicitly refers to the object created by the 


x:queryStatement within the same x:queryBlock


The x:queryDisplay actions refer to the current row in the query result that is being 


iterated over by x:queryCreateRows


The code that locates a connection (perhaps from a connection pool), performs the 


JDBC  API query, and navigates through the result of this query is hidden in the 


implementation of the custom actions. This encourages division of labor and isolation 


from changes.


21


JavaServer Pages 1.1 Specification   November 30, 1999






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