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A PostgreSQL Interface for Excel Online Data

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

Connect to Excel Online Data as a JDBC Data Source

To connect to Excel Online 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.excelonline.ExcelOnlineDriver

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

    You can connect to a workbook by providing authentication to Excel Online and then setting the following properties:

    • Workbook: Set this to the name or Id of the workbook.

      If you want to view a list of information about the available workbooks, execute a query to the Workbooks view after you authenticate.

    • UseSandbox: Set this to true if you are connecting to a workbook in a sandbox account. Otherwise, leave this blank to connect to a production account.

    You use the OAuth authentication standard to authenticate to Excel Online. See the Getting Started section in the help documentation for a guide. Getting Started also guides you through executing SQL to worksheets and ranges.

    Built-in Connection String Designer

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

    java -jar cdata.jdbc.excelonline.jar

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

    A typical JDBC URL is below:

    jdbc:excelonline: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.

  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 Excel Online Data as a PostgreSQL Database

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

  1. Log into your database.
  2. Load the extension for the database: CREATE EXTENSION jdbc2_fdw;
  3. Create a server object for Excel Online: CREATE SERVER ExcelOnline FOREIGN DATA WRAPPER jdbc2_fdw OPTIONS ( drivername 'cdata.jdbc.excelonline.ExcelOnlineDriver', url 'jdbc:excelonline:InitiateOAuth=GETANDREFRESH', querytimeout '15', jarfile '/home/MyUser/CData/CData\ JDBC\ Driver\ for\ Salesforce MyDriverEdition/lib/cdata.jdbc.excelonline.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 ExcelOnline OPTIONS ( username 'admin', password 'test');
  5. Create a foreign table in your local database: postgres=# CREATE FOREIGN TABLE test_xlsx_sheet1 ( test_xlsx_sheet1_id text, test_xlsx_sheet1_Id text, test_xlsx_sheet1_Column1 numeric) SERVER ExcelOnline OPTIONS ( table_name 'test_xlsx_sheet1');
You can now execute read/write commands to Excel Online: postgres=# SELECT * FROM test_xlsx_sheet1;