EDB PostgreSQL RM Switch Module

Provides the information required to build the EDB PostgreSQL RM switch module.
Attention: This topic applies to a feature that is in Early Adopter Program (EAP) release status. We intend to provide the finalized feature in a future release. Please contact Micro Focus Customer Care if you require further clarification.

The EDB PostgreSQL module provides two-phase commit support using PostgreSQL-provided SQL calls, and ensures that any database connections made using this switch module all participate in a single XA transaction.

PostgreSQL Server configuration for XA

Important: Before you can use the EDB PostgreSQL RM Switch Module, you must configure the PostgreSQL Server by changing the value of the max_prepared_transactions property from its default value of 0 (zero) to a value greater than 0. After making this change, you must restart the server before proceeding. For additional details about the max_prepared_transactions configuration property, see your PostgreSQL documentation.
Source Code
The EDB PostgreSQL RM switch module COBOL source file, ESPGSQLXA.CBL is located by default in the %ProgramFiles(x86)%\Micro Focus\Enterprise Developer\src\enterpriseserver\xa directory.
Note: If you prefer to supply user credentials programatically rather than in the xa_open string, instructions for doing so are provided in the COBOL source file in the Customization section.
Build Requirements
To build the EDB PostgreSQL RM switch module, you must have the Windows Software Development Kit (SDK) installed for your version of Windows.

Before building this switch module, ensure that your LIB environment variable contains the path to the odbc32.lib file, located in a subdirectory under your Windows SDK LIB directory.

Building the Switch Module
Method 1
  1. Start an Enterprise Developer command prompt, 32-bit or 64-bit depending on the application, running as an administrator.
  2. Change to the %ProgramFiles(x86)%\Micro Focus\Enterprise Developer\src\enterpriseserver\xa directory (default location).
  3. Enter build pg [directives]
Method 2
  1. Start an Enterprise Developer command prompt, 32-bit or 64-bit depending on the application.
  2. Copy all files from the %ProgramFiles(x86)%\Micro Focus\Enterprise Developer\src\enterpriseserver\xa directory (default location) to any location where you have WRITE permission.
  3. Change to the directory containing the copied files.
  4. Enter build pg [directives]
Build Output
The build process produces two binary switch module files from the ESPGSQLXA.CBL COBOL source file:
Binary File Type
ESPGSQLXA_S.DLL static
ESPGSQLXA.DLL dynamic

You can register an RM switch module with Enterprise Server dynamically, or register it statically depending on which binary file you use. We recommend that you use the dynamic switch module option, as this ensures that only active databases used in the global transaction participate in the TM/RM XA flow.

Additional Resources
For more information on using the EDB PostgreSQL RM switch module, including the xa_open string definition, see EDB PostgreSQL xa_open string.
Parent topic: Building RM Switch Modules
Related concepts
EDB PostgreSQL xa_open string