如何在Report Server中创建基于PostgreSQL的Mondrian数据源连接？解决Saiku报表问题

I’ve worked through similar setups before, so here’s a straightforward step-by-step to get your new data source up and running:

Prerequisites #

First, make sure the PostgreSQL JDBC driver (postgresql-<version>.jar) is in your Report Server’s lib directory. If it’s missing, download a version matching your PostgreSQL server, add it to the folder, and restart the Report Server.

Step-by-Step Setup #

1. Log into your Report Server and head to Admin > Data Sources.
2. Click Add Data Source and select Mondrian OLAP from the available types.
3. Fill in basic details:
   • Name: A clear, descriptive name (e.g., "PostgreSQL Sales OLAP")
   • Description: Optional, but useful for other team members
4. Configure the JDBC connection:
   • JDBC URL: Use the format jdbc:postgresql://<db-host>:<port>/<database-name> (default port is 5432)
   • Driver Class: Enter org.postgresql.Driver
   • Username/Password: Input credentials for a PostgreSQL user with read access to your OLAP tables
5. Set up the Mondrian schema:
   • Either upload a pre-written .mondrian.xml file or paste the schema XML directly into the text box. This schema defines your cubes, dimensions, measures, and their mappings to PostgreSQL tables.
   • Use the Validate Schema button to catch typos or mapping errors before saving.
6. Click Test Connection to confirm everything works, then hit Save to finalize the data source.

If you’re stuck building Saiku reports with existing Mondrian connections, here are the most common fixes I’ve relied on:

• Schema Validation Failures: Even a tiny typo in table/column names or invalid MDX in the Mondrian schema can break Saiku. Use Report Server’s built-in schema validator or Mondrian’s standalone tool to spot issues.
• Permission Mismatches: Ensure your user account has:
  • Access to the Mondrian data source in Report Server (check role permissions under Admin > Roles)
  • Proper PostgreSQL grants to read the tables in the schema (run GRANT SELECT ON ALL TABLES IN SCHEMA <schema-name> TO <your-user>; if needed)
• Saiku Integration Issues: Confirm the Saiku plugin is enabled and up-to-date. Some Report Server versions require you to toggle an "Allow Saiku Access" checkbox when editing the Mondrian data source.
• MDX Query Errors: Start with a super simple MDX query (e.g., SELECT [Measures].[Total Sales] ON COLUMNS FROM [Sales Cube]) to test if the connection works. If that fails, the issue is with the data source; if it works, your complex query has a problem.
• Driver Compatibility: Mismatched JDBC driver versions cause weird, hard-to-debug errors. Make sure your PostgreSQL driver is compatible with both your PostgreSQL server and the Mondrian version in Report Server.
• Cache Corruption: Old cache data can interfere. Clear Report Server’s cache (under Admin > Cache Management) and Saiku’s temp cache, then restart the server and try again.

内容的提问来源于stack exchange，提问作者Swapnil Solanki