Basic Example using For Each Component

1. Basic Example
using For Each
Component

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

3. FLOW

4. XML:
<?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="8080" path=“fe"
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>

5. Output:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ 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=Subject, marks=55, name=Name1, 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=Subject, marks=65, name=Name2, 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=Subject, marks=75, name=Name3, 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=Subject, marks=45, name=Name4, id=4}

6. Execution:
URL to trigger the service from browser
http://localhost:8080/fe
Database component connects to the specific database, executes the select
query and prints the result (one by one) using for each component

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