已尝试设置search_path为public仍无法解决Heroku Connect中get_xmlbinary()函数不存在错误怎么办？

Hey there, let's work through this frustrating error you're facing with Heroku Connect. I've helped a few folks troubleshoot this exact issue, so here's what you need to check and fix:

• First, install the xml2 PostgreSQL extension
  The get_xmlbinary() function lives in the xml2 extension, which isn't installed by default in Heroku Postgres. To add it, fire up a psql session to your Heroku database:

  heroku pg:psql -a your-app-name
  

  Then run this command inside the psql shell:

  CREATE EXTENSION IF NOT EXISTS xml2;
  

  This will install the extension into the public schema (by default) and make the function available.

• Double-check your search_path (with a twist)
  You tried SET search_path TO public;, but if the xml2 extension ended up in another schema (like pg_catalog—though rare), you'll need to include it. Run this to confirm where the function lives:

  SELECT proname, nspname FROM pg_proc WHERE proname = 'get_xmlbinary';
  

  If it shows up in pg_catalog, update your search path to include both schemas:

  SET search_path TO public, pg_catalog;
  

  To make this permanent for your Heroku Connect user, you can alter the user's search path:

  ALTER ROLE your-heroku-connect-user SET search_path TO public, pg_catalog;
  

• Verify Heroku Connect has access to the function
  Ensure the database user that Heroku Connect uses has permission to execute get_xmlbinary(). You can grant access with:

  GRANT EXECUTE ON FUNCTION get_xmlbinary() TO your-heroku-connect-user;
  

• Restart Heroku Connect
  Sometimes Heroku Connect caches database schema information. After installing the extension and adjusting permissions, head to your Heroku Dashboard, find the Heroku Connect add-on, and restart it. This forces it to pick up the new function.

If you still run into issues, double-check that the extension installed successfully by running \dx in psql to list all installed extensions—you should see xml2 listed there.

内容的提问来源于stack exchange，提问作者Prasad