Using Mule Studio to read XML Data from File(Inbound) and write it to PostgreSQL (Outbound) - Step by Step approach

Niladri.Biswas
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In this article we will look into as how we can use Mule Studio to read XML Data from File(Inbound) and write it to PostgreSQL (Outbound)


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Using Mule Studio to read XML Data from File(Inbound) and write it to PostgreSQL (Outbound) - Step by Step approach

In the last article we saw how to use Mule Studio for reading CSV Data from File(Inbound) and write it to PostgreSQL (Outbound).In this article we will look into reading XML Data from File(Inbound) and write it to PostgreSQL (Outbound).

What we need to have for doing the experiment?

We need

  1. PostgreSQL
  2. PostgreSQL JDBC driver
  3. Download Mule ESB
  4. A database to be created in PostgreSQL say "TestDB" where atleast one Table say "tblFamily" should be created.

    			-- Table Creation Script
    			CREATE TABLE "tblFamily"
    			(			 
    			  "Title" text,
    			  "FirstName" text,
    			   "LastName" text
    			)
    		
  5. A CSV file from where the data needs to be read.The CSV file structure will be as under

  6. Everything should be up and running properly

Let us start the experiment

Step1:Open Mule Studio

So now we are all set to do our first example using Mule Studio.Execute the "MuleStudio.exe" and enter a location for creating the workspace. Workspace is the location where we need to work for the project.

Click on "OK" button to receive the Mule Studio window.Click on "Go to Mule Studio".We will receive the Mule studio editor.

Click File > New > Mule Project.From the "New Mule Project" window that appears, populate the "Name" field with "JDBC-PostgreSQL-Mule-Experiment".

Click "Next" button and "New Mule Flow" window appears.Click "Next" button and "New Mule Flow" window appears.Leave it as it is.Click "Next" button and "Create New Java Project" window appears. Use proper JRE version that you are using.

Click "Next" button and "Java Settings" window appears.Leave it as it is.Click "Finish" button.We will be presented with the following

Step2:Import the Postgre SQL JDBC Driver

(a)In the Package Explorer, right-click over the Project folder ( in this case "jdbc-postgresql-mule-experiment)- >BuildPath->Add External Archives…

(b)Choose the location where the "postgresql-9.2-1002.jdbc4.jar" jar file is located in the hard drive and then click on the "Open" button.

(c)Now we can find the jar file being present in the "Referenced Libraries" of the package explorer.

This will allow us to create an instance of the Object driver

Step 3: Now the time for creating DataSource

(a) Switch to the "Global Elements" tab

(b)Click on the "Create" button.Look for Data Sources > PostgreSQL Data Source and click the OK button.

(c)The PostgreSQL Data Source Window appears

(d)In that, we need to specify the Database name in the URL section, PostgreSQL User Name in the "User" field and Password in "Password" field and click OK.

Step4:Let us create the Connector now

So we have successfully created a DataSource with it's proper driver.Now we need a Connector.

(a)Click on the "Create" button.Look for Connector > Database.Then click OK.

(b)From the Database Window that appears, click on the "Database Specific" dropdown and choose "PostgreSQL_Data_Source".It is the Data-Source that we created in the previous step

(c)Switch to the "Queries" tab and click on the button ("Add Query"). First we need to specify the "Query Key"(which is "Insert Record" here) and then the query as shown under.Click "OK" button.

INSERT INTO "tblFamily"("Title", "FirstName", "LastName") VALUES (#[xpath('//Title').text],#[xpath

('//FirstName').text],#[xpath('//LastName').text])

Finally, we will be presented with the below screen if everything has gone right so far

If at this stage we view the "Configuration XML" tab, it will look like

<jdbc:postgresql-data-source name="PostgreSQL_Data_Source" user="postgres" password="niladri_123" 

url="jdbc:postgresql://localhost:5432/TestDB" transactionIsolation="UNSPECIFIED" doc:name="PostgreSQL Data Source"/>
<jdbc:connector name="PostgreSQL_JDBC_Connector" dataSource-ref="PostgreSQL_Data_Source" validateConnections="true" 

queryTimeout="-1" pollingFrequency="0" doc:name="Database">
  <jdbc:query key="InsertRecord" value="INSERT INTO "tblFamily"("Title", "FirstName", 

"LastName") VALUES (#[xpath('//Title').text],#[xpath('//FirstName').text],#[xpath('//LastName').text])"/>
</jdbc:connector>

Step5:Let us create flow now

Switch to the "Configuration XML" tab first and add the below piece of code just after the "<jdbc:postgresql-data- source....>"

<flow name="testxmlFlow1" doc:name="testxmlFlow1">
    
	<!-- Step 1: XML file source -->    	
	<file:inbound-endpoint path="D:\InputLocation" responseTimeout="10000" doc:name="Source"/>
	
	<!-- Step 2: Convert between byte arrays and strings -->        
	<byte-array-to-string-transformer doc:name="Byte-Array-to-String"/>
	
	<!-- Step 3: Split each row using XPath -->        
	<splitter evaluator="xpath" expression="/Families/Family" doc:name="Splitter"/>
	
	<!-- Step 4: Dump into the destination Database -->        
	<jdbc:outbound-endpoint exchange-pattern="one-way" queryKey="InsertRecord" queryTimeout="-1" connector-

ref="PostgreSQL_JDBC_Connector" doc:name="Destination"/>
        
</flow>

It is quite simple.At the first step, we basically use the "File" component(InBound) to locate the XML file.

In the second step, we basically convert between byte arrays and strings by using the "byte-array-to-string-transformer"

In the third step, we basically parse the XML file value by using the "Splitter" component.We specify a valid Mule XPath expression for the purpose.

In the last step , we push the records to the PostgreSQL Database which is the "Database" component (Outbound).

The final flow is

The full configuration XML should look like

<?xml version="1.0" encoding="UTF-8"?>

<mule xmlns:file="http://www.mulesoft.org/schema/mule/file"
	xmlns:jdbc="http://www.mulesoft.org/schema/mule/jdbc" 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="CE-3.3.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="
http://www.mulesoft.org/schema/mule/file http://www.mulesoft.org/schema/mule/file/current/mule-file.xsd 
http://www.mulesoft.org/schema/mule/jdbc http://www.mulesoft.org/schema/mule/jdbc/current/mule-jdbc.xsd 
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 ">
    
    <jdbc:postgresql-data-source name="PostgreSQL_Data_Source" user="postgres" password="niladri_123" 

url="jdbc:postgresql://localhost:5432/TestDB" transactionIsolation="UNSPECIFIED" doc:name="PostgreSQL Data Source"/>
    <jdbc:connector name="PostgreSQL_JDBC_Connector" dataSource-ref="PostgreSQL_Data_Source" validateConnections="true" 

queryTimeout="-1" pollingFrequency="0" doc:name="Database">
        <jdbc:query key="InsertRecord" value="INSERT INTO "tblFamily"("Title", "FirstName", 

"LastName") VALUES (#[xpath('//Title').text],#[xpath('//FirstName').text],#[xpath('//LastName').text])"/>
    </jdbc:connector>
    
    <flow name="testxmlFlow1" doc:name="testxmlFlow1">
    
    	<!-- Step 1: XML file source -->    	
        <file:inbound-endpoint path="D:\InputLocation" responseTimeout="10000" doc:name="Source"/>
        
        <!-- Step 2: Convert between byte arrays and strings -->        
        <byte-array-to-string-transformer doc:name="Byte-Array-to-String"/>
        
        <!-- Step 3: Split each row using XPath -->        
        <splitter evaluator="xpath" expression="/Families/Family" doc:name="Splitter"/>
        
        <!-- Step 4: Dump into the destination Database -->        
        <jdbc:outbound-endpoint exchange-pattern="one-way" queryKey="InsertRecord" queryTimeout="-1" connector-

ref="PostgreSQL_JDBC_Connector" doc:name="Destination"/>
        
    </flow>
</mule>

We are now almost done.Next we need to run the application.Right click on "JDBC-PostgreSQL-Mule-Experiment.mflow" and from the context menu, choose Run As->Mule Application.

We will encounter the below screen

If we now look into the tblFamily, we will find that 5 records has been inserted

Conclusion

Hope you enjoyed the step by step tutorial of using Mule Studio to read XML Data from File(Inbound) and write it to PostgreSQL(Outbound).I will write more on the same as and when I will perform some experiment.Thanks for reading.The configuration-xml file and cource xml file is attached in the zipped format.

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About the Author

Niladri.Biswas
Full Name: Niladri Biswas
Member Level: Platinum
Member Status: Member
Member Since: 10/25/2010 11:04:24 AM
Country: India
Best Regards, Niladri Biswas
http://www.dotnetfunda.com
Technical Lead at HCL Technologies

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