The document discusses how to use the For Each component in Mule applications. The For Each component splits a collection into elements and processes them iteratively through embedded processors. An example Mule flow is provided that uses a For Each component to iterate over results returned from a database query and log each element. The flow executes a select query, passes the results to the For Each component, and logs the payload within the loop to output each database record individually.

1. How to use For Each Component
28-09-2014

2. Abstract
• The main motto of this PPT is how to use For
Each component in our applications.

3. Introduction
• The Foreach scope splits a collection into
elements and processes them iteratively
through the processors embedded in the
scope, then returns the original message to
the flow.

4. Example

5. • .mflow<?xml version="1.0" encoding="UTF-8"?>
• <mule xmlns:jdbc-ee="http://www.mulesoft.org/schema/mule/ee/jdbc" xmlns:http="http://www.mulesoft.org/schema/mule/http"
xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
xmlns:spring="http://www.springframework.org/schema/beans" version="EE-3.4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-
instance" xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-current.xsd
• http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
• http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
• http://www.mulesoft.org/schema/mule/ee/jdbc http://www.mulesoft.org/schema/mule/ee/jdbc/current/mule-jdbc-ee.xsd">
• <jdbc-ee:mssql-data-source name="MS_SQL_Data_Source" user=“****" password=“****"
url="jdbc:sqlserver://localhost;databaseName=test1" transactionIsolation="UNSPECIFIED" doc:name="MS SQL Data Source"/>
• <jdbc-ee:connector name="Database" dataSource-ref="MS_SQL_Data_Source" validateConnections="true" queryTimeout="-1"
pollingFrequency="0" doc:name="Database"/>
• <flow name="Database_ComponentFlow1" doc:name="Database_ComponentFlow1">
• <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8087" path="database" doc:name="HTTP"/>
• <logger message="--main flow--" level="INFO" doc:name="Logger"/>
• <jdbc-ee:outbound-endpoint exchange-pattern="request-response" queryKey="select" queryTimeout="-1" connector-
ref="Database" doc:name="Database">
• <jdbc-ee:query key="select" value="select * from mytable"/>
• </jdbc-ee:outbound-endpoint>
• <foreach collection="#[payload]" doc:name="For Each">
• <logger message="--In foreach loop" level="INFO" doc:name="Logger"/>
• <logger message="--Result--#[payload]" level="INFO" doc:name="Logger"/>
• </foreach>
• </flow>
• </mule>

6. • Output:INFO 2015-10-03 17:50:45,299 [main] org.mule.DefaultMuleContext:
• **********************************************************************
• * Application: Database Component *
• * OS encoding: Cp1252, Mule encoding: UTF-8 *
• * *
• * Agents Running: *
• * Clustering Agent *
• * JMX Agent *
• **********************************************************************
• INFO 2015-10-03 17:50:45,300 [main] org.mule.module.launcher.MuleDeploymentService:
• ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
• + Started app 'Database Component' +
• ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
• INFO 2015-10-03 17:50:52,770 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-main flow--
• INFO 2015-10-03 17:50:52,778 [[Database Component].connector.http.mule.default.receiver.02] org.mule.lifecycle.AbstractLifecycleManager:
Initialising: 'Database.dispatcher.424429501'. Object is: EEJdbcMessageDispatcher
• INFO 2015-10-03 17:50:52,779 [[Database Component].connector.http.mule.default.receiver.02] org.mule.lifecycle.AbstractLifecycleManager:
Starting: 'Database.dispatcher.424429501'. Object is: EEJdbcMessageDispatcher
• INFO 2015-10-03 17:50:53,042 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-In foreach loop
• INFO 2015-10-03 17:50:53,046 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-Result--{subj=Hindi, marks=55, name=Ramesh, id=1}
• INFO 2015-10-03 17:50:53,047 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-In foreach loop
• INFO 2015-10-03 17:50:53,049 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-Result--{subj=English, marks=65, name=Mahesh, id=2}
• INFO 2015-10-03 17:50:53,050 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-In foreach loop
• INFO 2015-10-03 17:50:53,052 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-Result--{subj=science, marks=75, name=Pavan, id=3}
• INFO 2015-10-03 17:50:53,053 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-In foreach loop
• INFO 2015-10-03 17:50:53,056 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-Result--{subj=social, marks=45, name=Siva, id=4}

7. • Flow of execution:
1. URL to trigger the service from browser
http://localhost:8087/foreach
2. Database component connects to the specific
database, executes the select query and prints
the result (one by one) using for each
component

8. References
• https://docs.mulesoft.com/mule-user-
guide/v/3.7/foreach