Database Xpath-extension Functions in SOA 12 by Pranav Davar

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In SOA, we can connect with databases using a database jca adapter and configuring the data source and connection factory in the WebLogic server. Sometimes, we may want to query the database directly within the BPEL component or XSLT without configuring a database jca adapter. For such use cases, we can take leverage of database functions that can be used within BPEL Assign Activity or XSLT transformations.

We have 3 different database functions available, that can be used in different use cases.

  1. oraeext:sequence-next-val()
  2. oraext:lookup-table()
  3. oraext:query-database()

1. oraext:sequence-next-val()

Syntax:

oraext:sequence-next-val(sequence as string, dataSource as string)
sequence: Specify the sequence available in the database for which the next value needs to be extracted.

dataSource: Specify the Data source JNDI name as configured in WebLogic server or JDBC string in the format jdbc:oracle:thin:username/password@host:port:sid

Note: Only oracle thin driver is supported if used as JDBC string.

This function is used when we want to fetch the next value of defined sequence in the database. It can be used in cases where we want each request to adhere with a particular sequence id which can be used to identify each unique record where using a db adapter might create overhead and extra transformation. This function is basically an alternative to the below SQL statement. Read the complete article here.

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Technorati Tags: SOA Community,Oracle SOA,Oracle BPM,OPN,Jürgen Kress

About Jürgen Kress
As a middleware expert Jürgen works at Oracle EMEA Alliances and Channels, responsible for Oracle’s EMEA Fusion Middleware partner business. He is the founder of the Oracle SOA & BPM and the WebLogic Partner Communities and the global Oracle Partner Advisory Councils. With more than 5000 members from all over the world the Middleware Partner Community is the most successful and active community at Oracle. Jürgen manages the community with monthly newsletters, webcasts and conferences. He hosts his annual Fusion Middleware Partner Community Forums and the Fusion Middleware Summer Camps, where more than 200 partners get product updates, roadmap insights and hands-on trainings. Supplemented by many web 2.0 tools like twitter, discussion forums, online communities, blogs and wikis. For the SOA & Cloud Symposium by Thomas Erl, Jürgen is a member of the steering board. He is also a frequent speaker at conferences like the SOA & BPM Integration Days, JAX, UKOUG, OUGN, or OOP.

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