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A PostgreSQL Interface for Btrieve Data

Use the Remoting features of the Btrieve JDBC Driver to create a PostgreSQL entry-point for data access.

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

Connect to Btrieve Data as a JDBC Data Source

To connect to Btrieve 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.btrieve.BtrieveDriver

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

    The PSQL v13 client will need to be installed on the same machine as the driver. To connect, set the User, Password, Server, and Database properties.

    Built-in Connection String Designer

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

    java -jar cdata.jdbc.btrieve.jar

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

    A typical JDBC URL is below:

    jdbc:btrieve:User=myuser;Password=mypassword;Server=myserver;Database=mydatabase;

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.

  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 Btrieve Data as a PostgreSQL Database

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

  1. Log into your database.
  2. Load the extension for the database: CREATE EXTENSION jdbc2_fdw;
  3. Create a server object for Btrieve: CREATE SERVER Btrieve FOREIGN DATA WRAPPER jdbc2_fdw OPTIONS ( drivername 'cdata.jdbc.btrieve.BtrieveDriver', url 'jdbc:btrieve:User=myuser;Password=mypassword;Server=myserver;Database=mydatabase;', querytimeout '15', jarfile '/home/MyUser/CData/CData\ JDBC\ Driver\ for\ Salesforce MyDriverEdition/lib/cdata.jdbc.btrieve.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 Btrieve OPTIONS ( username 'admin', password 'test');
  5. Create a foreign table in your local database: postgres=# CREATE FOREIGN TABLE billing ( billing_id text, billing_Student_ID text, billing_Transaction_Number numeric) SERVER Btrieve OPTIONS ( table_name 'billing');
You can now execute read/write commands to Btrieve: postgres=# SELECT * FROM billing;