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BPEL Database Adapter Part 1Author
Name: prudhvi E-mail: [email protected]
Database Adapter is a partnerlink in BPEL which is used to interact with
Database for read, write operations. Using Database Adapter we can perform
the following functions.
1. Call a Stored Procedure of Function
2. Perform DML operations like insert, update, delete on a table
3. Perform SELECT operation
4. Execute custom SQL Statements
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English
008847959432230710149:f24qrsxseto
FORID:10
In this Article I will explain how to create simple synchronous BPEL process
containing Database Adapter which will read the data from a table and pa
Overview:
Database Adapter is a partnerlink in BPEL which is used to interact with Database for
read, write operations. Using Database Adapter we can perform the following functions.
1. Call a Stored Procedure of Function
2. Perform DML operations like insert, update, delete on a table
3. Perform SELECT operation
4. Execute custom SQL Statements
In this Article I will explain how to create simple synchronous BPEL process containing
Database Adapter which will read the data from a table and pass the value to output
parameter.
Prerequisites:
1. You need to establish a Database Connection in Connection Navigator before you proceed further. Refer to my previous article on how to create a Database Connection by
clicking the following link h t t p : / / w w w . a p p s f a q . c o m / A p p s / o r a c l e - a p p l i c a t i o n s / a r t i c l e s / F u s i o n - M i d d l e w a r e / S O A / B P E L / B P E L - O l i t e - D a t a b a s e - C o n n e c t i o n / i n d e x . a s p x
2. If this is your first BPEL Process I suggest you to go through my hello world article first.
h t t p : / / w w w . a p p s f a q . c o m / A p p s / o r a c l e - a p p l i c a t i o n s / a r t i c l e s / F u s i o n - M i d d l e w a r e / S O A / B P E L / B P E L - T u t o r i a l - f o r - b e g i n n e r s - w i t h - h e l l o w o r l d - e x a m p l e / i n d e x . a s p x
Create Application:
Open JDeveloper and select Applications in the JDeveloper
Right Click on ‘Application’ and select ‘New Application’
Create Application Window opens as show below
Change the Application Name to ‘DatabaseAdapterTutorial’
Leave remaining fields with default values and click OK
Click Cancel not the OK button
Create Process
Right click on the DatabaseAdapterTutorial and click New Project as show below
Select ‘BPEL Process Project’ from the projects list
Click Ok
Chang the Name which is optional and change the Template to Synchronous BPEL
Process as shown below.
Click Next
Leave the default values and click Finish
DatabaseAdapterTutorial Shows up in the Applications Navigator
On the right side of the jdeveloper window select ‘Services’ in the component Palette
dropdown box.
Select the Database Adapter and Drag it to right side Services portion of jdeveloper main
window
Adapter Configuration Wizard screen will pop up as below
Click Next
Enter the Service Name as ‘FetchEmail’
Description field is optional
Click Next
Select the Database Connection ‘BPELOlite’ from the Connection list. This connection
varies as you create Database connections in Connection Navigator
Leave the JNDI Name with default value and click next
Select ‘Perform an Operation on a Table’ option from the list
check Only ‘SELECT’ checkbox
Click Next
Click on Import Tables button
Click on the Query button to see the list of tables available in your database
Select the Table name from the list on which you want to operate the select command
I have selected the table ERPSCHOOLS. I am listing the commands below to create the
table ERPSCHOOLS if you want to use
Now Click Ok
Click Next
Select all columns and click Next
I am not creating any relationship with this table so just click Next button
Click Next
SELECT command is shown in SQL box. If you want to add any parameters to the query
you can add it here. You can also directly edit your SQL statement. I am changing my
SQL statement to fetch only one record.
Click Next
Click Finish
Create Partner link will pop up as shown below
Leave all fields with default values and click OK
Now your BPEL main window screen should look like the below screen
Fetch email partner link/Database Adapter will show in Service area as shown in the red
circle.
Now select ‘Process Activities’ in the Component Palette
Select and Drag the Invoke activity below the receiveInput activity
Double click the Invoke_1 activity
Change the Name to Invoke_FetchEmail
Click on the Flashlight right to Partner Link Field
Select FetchEmail and click OK
Partner Link and Operation fields are populated automatically
Click on the Create Variable fields right to both input and output Variables
Click the small red circle icon, create variable window will pop up as shown below
Click Ok
Now click on red circle icon right to output variable
Click Ok
Click Apply
If you have everything correctly you should not see the errors in the red circle show in the
above figure.
If you don’t have any errors click OK
Main screen should look like the above picture.
We have created the Invoke activity which will call Database Adapter(FetchEmail) and
Database Adapter will query the table ERPSCHOOLS and fetches email field value. Now
to catch the value fetched by Database Adapter use Assign Activity, which will transfer
the value of email field fetched by Database Adapter to replyOutput field.
Drag the Assign activity from the component palette to mainwindow below the
Invoke_FetchEmail activity.
Double click on Assign_1 activity to open the Assign properties window
Chang the name to Assign_Email and click on the second tab ‘Copy Operation’
Click Create button circled above and select ‘Copy Operation’ to open the Create Copy
Operation window as show below
Select ns2:email on the left and client:result on the right side as show below
Click OK
Click Apply to remove the errors
Click Ok
Save your project by clicking CTRL+S
DEPLOY BPEL Process
Now we are ready to deploy the process, Start your SOA Suite and deploy the process
If you are not familiar with deploy process follow the link to see how to deploy the process
After you deploy your process successfully your Apache Ant log will show like this
Run the BPEL Process
Go to your BPEL Console
h t t p : / / l o c a l h o s t : 8 8 8 8 / B P E L C o n s o l e
login in with oc4jadmin/welcome1 (default values)
Once you login to console you can see ‘DatabaseAdapterTutorial’ project in the Deployed
BPEL Processes list.
Click on DatabaseAdapterTutorial
The initiate screen will show up
Click on Post XML Message
Click on Visual Flow
Click on Assign_Email activity to see the output
The result field contains p r u d h v i @ e r p s c h o o l s . c o m which is my output.
praneeth commented on 11/19/2009 12:30:50 AM
Excellent tutorials for Bpel beginners. Thanks for providing this to us Prudhvi.
Hemadri commented on 11/25/2009 3:59:34 AM
Good article
Brindha commented on 12/2/2009 3:59:24 AM
Really Good.. Understood the concept of DB adapter now!!
saravanan commented on 12/22/2009 2:48:01 AM
v.good article .would requesting to post more article on the same area if u have time.
Jay
Shete commented on 1/1/2010 5:32:28 PM
Very good example, Thanks for your help
Pawan
Saini commented on 3/10/2010 9:24:31 AM
Nice article. I have a question here, If I do not put any where clause in the generated
query will it return the complete data in the table?
Bhushan commented on 3/25/2010 4:46:42 PM
Hi, how can I import multiple table?
venky commented on 5/18/2010 3:44:22 AM
In the database connection, i connect to a remote Oracle database, when i deploy and
run the process,it gives an exception saying "Could not create/access the TopLink
Session.
This session is used to connect to the datastore" and says to change the oc4j-ra.xml in
the J2EEHome directory....pls help
stanly commented on 5/29/2010 11:03:11 AM
Nice tutorial Prudhvi. Thanks for sharing it with us.
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In this article I will explain how to pass parameters to the Database Adapter. This article is
continuation of our previous Database Adapter Tutorial 1.
Open previously created project in jdeveloper.
Post
Cancel
Now Double Click the ‘FetchEmail’ Database Adapter
Click the Define Adapter Service Icon
Click Next
Next
Next
Next
Next
Next
In the Parameters Section Click Add Button
Enter Parameter Name as v_id
Click Ok
In the SQL Section click Edit Button
Click Yes
Click Add
In the Second Argument select Parameter option and select v_id
Click Ok
Click Next
Click Finish
Click Apply and Ok
Save Project CTRL+S
Now Double Click Invoke_FetchEmail activity and
Select Operation as FetchEmailSelect_v_id
Click Automatically Create Input Variable button and Automatically Create Output Variable
buttons to create new variables
Click Apply and then OK
Save Project CTRL+S
Drag Assign Activity below the receiveInput and above the Invoke_FetchEmail
Double Click Assign_1 activity
Click Copy Operation tab
From Type: Variable
Client:input
To Type: Variable
ns2:v_id
Click Ok
Click Apply and OK
Save project CTRL+S
Double Click Assign_Email
And change the Copy Operation as per below picture
Click Ok
Save CTRL+S
Deploy the process
Select version as 1.1
Click Ok
BUILD SUCCESSFUL
Now go to h t t p : / / l o c a l h o s t : 8 8 8 8
Click BPEL Control
Click On DatabaseAdapterTutorial v 1.1
Enter the ID number as input and click submit
Output is displayed
Verify the output with Database
Pratap commented on 9/22/2009 5:24:35 PM
Hi,
Thanks for sharing the info.
How to fetch multiple records using db adapter.
Right now I have 5 to 6 columns in my query and in the output of bpel process I can view
only one column.
How can I view multiple columns and multiple records.
Thanks in Advance
Pratap
Regards,
Pratap.
mIKE commented on 10/15/2009 12:39:37 PM
do you have an update example??
vinodkumar commented on 8/17/2010 3:23:50 AM
HI SIR,
THANKS FOR GIVING ME THIS VALUEABLE INFORMATION..........