Build a PostgreSQL Interface for Wave Financial Data using the CData JDBC Driver

There are a vast number of PostgreSQL clients available on the Internet. From standard Drivers to BI and Analytics tools, PostgreSQL is a popular interface for data access. Using our JDBC Drivers, you can now create PostgreSQL entry-points that you can connect to from any standard client.

To access Wave Financial data as a PostgreSQL database, use the CData JDBC Driver for Wave Financial and a JDBC foreign data wrapper (FDW). In this article, we compile the FDW, install it, and query Wave Financial data from PostgreSQL Server.

Connect to Wave Financial Data as a JDBC Data Source

To connect to Wave Financial as a JDBC data source, you will need the following:

• Driver JAR path: The JAR is located in the lib subfolder of the installation directory.

• Driver class:

  cdata.jdbc.wavefinancial.WaveFinancialDriver
  

• JDBC URL: The URL must start with "jdbc:wavefinancial:" and can include any of the connection properties in name-value pairs separated with semicolons.

  Connect using the API Token

  You can connect to Wave Financial by specifying the APIToken You can obtain an API Token using the following steps:

  1. Log in to your Wave account and navigate to "Manage Applications" in the left pane.
  2. Select the application that you would like to create a token for. You may need to create an application first.
  3. Click the "Create token" button to generate an APIToken.

  Connect using OAuth

  If you wish, you can connect using the embedded OAuth credentials. See the Help documentation for more information.

  Built-in Connection String Designer

  For assistance in constructing the JDBC URL, use the connection string designer built into the Wave Financial JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.

  java -jar cdata.jdbc.wavefinancial.jar
  

  Fill in the connection properties and copy the connection string to the clipboard.

  👁 Using the built-in connection string designer to generate a JDBC URL (Salesforce is shown.)
  

  A typical JDBC URL is below:

  jdbc:wavefinancial:InitiateOAuth=GETANDREFRESH;
  

Build the JDBC Foreign Data Wrapper

The Foreign Data Wrapper can be installed as an extension to PostgreSQL, without recompiling PostgreSQL. The jdbc2_fdw extension is used as an example (downloadable here).

1. Add a symlink from the shared object for your version of the JRE to /usr/lib/libjvm.so. For example:

   ln -s /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server/libjvm.so /usr/lib/libjvm.so
   

2. Start the build:

   make install USE_PGXS=1
   

Query Wave Financial Data as a PostgreSQL Database

After you have installed the extension, follow the steps below to start executing queries to Wave Financial data:

1. Log into your database.
2. Load the extension for the database:

   CREATE EXTENSION jdbc2_fdw;
   

3. Create a server object for Wave Financial:

   CREATE SERVER WaveFinancial 
   FOREIGN DATA WRAPPER jdbc2_fdw OPTIONS (
   drivername 'cdata.jdbc.wavefinancial.WaveFinancialDriver',
   url 'jdbc:wavefinancial:InitiateOAuth=GETANDREFRESH;',
   querytimeout '15',
   jarfile '/home/MyUser/CData/CData\ JDBC\ Driver\ for\ Salesforce MyDriverEdition/lib/cdata.jdbc.wavefinancial.jar'); 
   

4. Create a user mapping for the username and password of a user known to the MySQL daemon.

   CREATE USER MAPPING for postgres SERVER WaveFinancial OPTIONS (
   username 'admin', 
   password 'test');
   

5. Create a foreign table in your local database:

   postgres=# CREATE FOREIGN TABLE invoices (
   invoices_id text,
   invoices_Id text,
   invoices_DueDate numeric) 
   SERVER WaveFinancial OPTIONS (
   table_name 'invoices');
   

You can now execute read/write commands to Wave Financial:

postgres=# SELECT * FROM invoices;