atg.droplet.sql

Class SQLQueryForEach

java.lang.Object

atg.nucleus.logging.VariableArgumentApplicationLoggingImpl

atg.nucleus.GenericService

atg.nucleus.TimedOperationService

atg.nucleus.servlet.ServletService

atg.nucleus.servlet.HttpServletService

atg.servlet.DynamoServlet

atg.droplet.ForEach

atg.droplet.sql.SQLQueryForEach

All Implemented Interfaces:

atg.core.logging.Logging, atg.core.logging.TraceLogging, atg.naming.AbsoluteNameable, NameContextBindingListener, NameContextElement, atg.naming.NameContextParentable, NameResolver, AdminableService, atg.nucleus.Configured, ApplicationLogging, atg.nucleus.logging.ApplicationLoggingSender, atg.nucleus.logging.TraceApplicationLogging, VariableArgumentApplicationLogging, ComponentNameResolver, Service, ServiceListener, ParameterServlet, java.util.EventListener, javax.servlet.Servlet

public class SQLQueryForEach
extends ForEach

This servlet executes a SQL query and renders its output parameter for each element returned by the query. The query can either be specified as a reference to an SQLQuery bean, or it can be specified inline with parameters.

For each row returned by the query, we set the following parameters:

index

The 0-based index of the returned row

count

The 1-based number of the returned row

element

A dynamic bean that has properties for accessing the values returned in the result set. You can access the values either by name or by column index. The name refers to either the column name or the column alias if one was used in the query. To access values by name, you say: "element.name". To access values by column index, you say: element.columns[i] where "i" is the 0-based index of the returned column.

As mentioned before, there are two ways that you can specify a query to the SQLQueryForEach droplet. You can refer to an existing SQLQuery bean using the queryBean parameter. For example, you might say:

   <param name="queryBean" value="bean:/mySite/MySQLQuery">
 

Alternatively, you can specify the SQL directly in the jhtml file with the querySQL parameter. In this case, you also have to specify the values of the "dataSource" and "transactionManager" parameters. Thus your droplet declaration would include the following parameters:

   <param name="myAge" value="bean:MyUser.age">
   <param name="querySQL" value="select * from person where age=:myAge">
   <param name="dataSource" value="bean:/atg/dynamo/service/jdbc/JTDataSource">>
   <param name="transactionManager" value="bean:/atg/dynamo/transaction/TransactionManager">>
 

The values for the ":name" constructs in your query are taken from the parameters in your request. You can also define a set of output parameters which you can use to control the formatting for the returned results:

outputStart

This parameter is rendered before any output tags if the array is not empty.

outputEnd

This parameter is rendered after all output tags if the array is not empty.

output

This parameter is rendered for once for each element in the array.

empty

This optional parameter is rendered if the array contains no elements.

error

This optional parameter is rendered if there was an error executing the query.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	CLASS_VERSION

Fields inherited from class atg.droplet.ForEach

ARRAY, COUNT, DEBUG, ELEMENT, ELEMENT_NAME, EMPTY, INDEX, INDEX_NAME, KEY, OUTPUT, OUTPUT_END, OUTPUT_START, REVERSE_ORDER, SIZE, SORT_PROPERTIES

Fields inherited from class atg.servlet.DynamoServlet

mAllowCleanupRequest, mParameters

Fields inherited from class atg.nucleus.servlet.ServletService

SERVLET_INFO_KEY

Fields inherited from class atg.nucleus.GenericService

SERVICE_INFO_KEY

Fields inherited from interface atg.nucleus.logging.TraceApplicationLogging

DEFAULT_LOG_TRACE_STATUS

Fields inherited from interface atg.nucleus.logging.ApplicationLogging

DEFAULT_LOG_DEBUG_STATUS, DEFAULT_LOG_ERROR_STATUS, DEFAULT_LOG_INFO_STATUS, DEFAULT_LOG_WARNING_STATUS

Constructor Summary

Constructors

Constructor and Description
SQLQueryForEach()

Method Summary

Modifier and Type	Method and Description
java.lang.Object	getArray(DynamoHttpServletRequest pReq) Returns the enumeration from the SQLQuery that contains the elements in the result set
void	service(DynamoHttpServletRequest pReq, DynamoHttpServletResponse pRes) Renders the list of items retrieved by the query

Methods inherited from class atg.droplet.ForEach

getSortedArray, serviceArray, serviceCollection, serviceDictionary, serviceEnumeration, serviceIndexedList, serviceIterator, serviceMap, serviceMapArray, servicePrimitiveArray, setElementParameter

Methods inherited from class atg.servlet.DynamoServlet

doDelete, doGet, doPost, doPut, getParameter, getParameters, getServletContext, init, service, service, setParameter

Methods inherited from class atg.nucleus.servlet.ServletService

destroy, getServletConfig, getServletInfo, setServletInfo

Methods inherited from class atg.nucleus.TimedOperationService

getAverageRequestHandlingTime, getHandledRequestCount, getRequestStartTime, getTotalRequestHandlingTime, isKeepingStatistics, notifyHandledRequest, resetStatistics, setKeepingStatistics

Methods inherited from class atg.nucleus.GenericService

addLogListener, createAdminServlet, doStartService, doStopService, getAbsoluteName, getAdminServlet, getAdminServletOutputStreamEncoding, getLoggingForVlogging, getLogListenerCount, getLogListeners, getName, getNameContext, getNucleus, getRoot, getServiceConfiguration, getServiceInfo, isAdminServletUseServletOutputStream, isLoggingDebug, isLoggingError, isLoggingInfo, isLoggingTrace, isLoggingWarning, isRunning, logDebug, logDebug, logDebug, logError, logError, logError, logInfo, logInfo, logInfo, logTrace, logTrace, logTrace, logWarning, logWarning, logWarning, nameContextElementBound, nameContextElementUnbound, removeLogListener, reResolveThis, resolveName, resolveName, resolveName, resolveName, sendLogEvent, setAdminServletOutputStreamEncoding, setAdminServletUseServletOutputStream, setLoggingDebug, setLoggingError, setLoggingInfo, setLoggingTrace, setLoggingWarning, setNucleus, setServiceInfo, startService, stopService, toString

Methods inherited from class atg.nucleus.logging.VariableArgumentApplicationLoggingImpl

vlogDebug, vlogDebug, vlogDebug, vlogDebug, vlogDebugTrace, vlogError, vlogError, vlogError, vlogError, vlogInfo, vlogInfo, vlogInfo, vlogInfo, vlogTrace, vlogTrace, vlogTrace, vlogTrace, vlogWarning, vlogWarning, vlogWarning, vlogWarning

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

CLASS_VERSION

public static java.lang.String CLASS_VERSION

Constructor Detail

SQLQueryForEach

public SQLQueryForEach()

Method Detail

getArray

public java.lang.Object getArray(DynamoHttpServletRequest pReq)

Returns the enumeration from the SQLQuery that contains the elements in the result set

Overrides:

getArray in class ForEach

service

public void service(DynamoHttpServletRequest pReq,
                    DynamoHttpServletResponse pRes)
             throws javax.servlet.ServletException,
                    java.io.IOException

Renders the list of items retrieved by the query

Overrides:

service in class ForEach

Parameters:

pReq - the request to be processed

pRes - the response object for this request

Throws:

javax.servlet.ServletException - an application specific error occurred processing this request

java.io.IOException - an error occurred reading data from the request or writing data to the response.