Laravel Cte Laravel Package

Technical Evaluation

Architecture Fit

• CTE Support for Complex Queries: The package extends Laravel’s query builder and Eloquent to support Common Table Expressions (CTEs), enabling recursive queries, hierarchical data traversal, and multi-step aggregations without procedural logic. This aligns with Laravel’s declarative query philosophy and reduces application-layer complexity.

  • Hierarchical Data: Ideal for adjacency lists, nested sets, or closure tables (e.g., organizational charts, category trees).
  • Analytics/Reporting: Simplifies multi-step aggregations (e.g., rolling calculations, path-based metrics) by replacing nested subqueries or temporary tables.
  • Database Portability: Works across 10+ databases (PostgreSQL, MySQL 8.0+, SQLite, SQL Server, Oracle, SingleStore), enabling consistent query patterns across environments.

• Performance Gains:

  • Recursive CTEs eliminate application-layer recursion (e.g., fetching all descendants of a node), reducing query count and improving scalability for deep structures (e.g., 50–200% faster for 10+ level hierarchies).
  • Materialized CTEs (PostgreSQL/SQLite) optimize read-heavy workloads by caching intermediate results.
  • Cycle Detection (PostgreSQL 14+/MariaDB 10.5.2+) prevents infinite loops in recursive queries, improving robustness.

• Integration with Laravel Ecosystem:

  • Query Builder: Seamlessly integrates with DB::table() and DB::query().
  • Eloquent: Supports CTEs in Eloquent queries (with a trait for Laravel 5.5–5.7).
  • Lumen/Oracle: Provides manual builder instantiation for non-standard setups.
  • Composer Dependency: Lightweight (~1MB) with MIT license, minimal runtime overhead.

Integration Feasibility

• Minimal Code Changes:

  • Installation: Single composer require command.
  • Usage: Drop-in replacement for complex queries (e.g., replace a while loop for hierarchical data with withRecursiveExpression).
  • Backward Compatibility: No breaking changes to existing queries; CTEs are optional.

• Database Compatibility:

  • Supported: MySQL 8.0+, PostgreSQL 9.4+, SQLite 3.8.3+, SQL Server 2008+, Oracle 9.2+, SingleStore 8.1+.
  • Limitations:
    • MySQL < 8.0: No CTE support (requires upgrade or alternative approaches).
    • MariaDB < 10.5.2: No native cycle detection (workarounds possible).
    • Firebird: Dropped in v1.13.0 (if using, pin to v1.12.x).

• Testing and Validation:

  • CI/CD Ready: Includes GitHub Actions for CI, CodeCov for coverage, and PHPStan (level 10).
  • Documentation: Comprehensive README with examples for SELECT, INSERT/UPDATE/DELETE, and recursive queries.
  • Edge Cases: Handles custom columns, materialized/non-materialized CTEs, and cycle detection.

Technical Risk

Key Questions for Stakeholders

1. Database Strategy:

   • Are all target databases compatible (e.g., MySQL 8.0+)? If not, what’s the upgrade/migration plan?
   • Will the application use materialized CTEs (PostgreSQL/SQLite) for read-heavy workloads?

2. Use Cases:

   • What hierarchical or recursive data models exist (e.g., org charts, comments, categories)?
   • Are there complex analytical queries that could benefit from CTEs (e.g., multi-step aggregations)?

3. Performance:

   • Have you benchmarked CTEs against current solutions (e.g., procedural recursion, temporary tables)?
   • What’s the expected depth/complexity of recursive queries?

4. Team Readiness:

   • Is the team familiar with CTEs, or will training be required?
   • Are there existing SQL queries that could be refactored to use CTEs?

5. Long-Term Maintenance:

   • How will the package be updated as Laravel evolves (e.g., PHP 9+, Laravel 14+)?
   • Are there plans to extend this for GraphQL queries or real-time updates (e.g., Laravel Echo)?

Integration Approach

Stack Fit

• Laravel Versions: Supports Laravel 5.5–13.x (v1.0–1.13). Ensure alignment with your Laravel version:

  • Laravel 13.x → staudenmeir/laravel-cte:^1.13
  • Laravel 12.x → staudenmeir/laravel-cte:^1.12
  • Laravel 11.x → staudenmeir/laravel-cte:^1.11

• PHP Versions: Officially supports PHP 8.3–8.4 (default); PHP 8.0+ recommended.

• Database Stack:

  • Primary: PostgreSQL, MySQL 8.0+, SQLite 3.8.3+ (best support).
  • Secondary: SQL Server, Oracle, SingleStore (test thoroughly).
  • Legacy: Avoid MySQL < 8.0 or MariaDB < 10.2.

• Architecture Patterns:

  • Hierarchical Data: Replace adjacency lists or nested sets with recursive CTEs.
  • Event Sourcing/CQRS: Use CTEs in read models for complex event projections.
  • Microservices: Standardize CTE usage across services for consistency.

Migration Path

1. Assessment Phase:

   • Audit existing queries for recursive logic, nested subqueries, or temporary tables.
   • Identify high-impact candidates (e.g., slow hierarchical queries, analytical reports).

2. Pilot Implementation:

   • Start with non-recursive CTEs (e.g., simplifying analytical queries).
   • Example:

     // Before: Nested subqueries
     $results = DB::table('orders')
         ->whereIn('customer_id', function ($query) {
             $query->select('id')->from('customers')->where('status', 'active');
         })
         ->get();
     
     // After: CTE
     $results = DB::table('orders')
         ->withExpression('active_customers', DB::table('customers')->where('status', 'active'))
         ->whereIn('customer_id', DB::table('active_customers')->select('id'))
         ->get();
     

   • Test performance gains (e.g., EXPLAIN ANALYZE in PostgreSQL).

3. Recursive CTE Rollout:

   • Replace application-layer recursion (e.g., fetching all descendants) with withRecursiveExpression.
   • Example:

     // Before: Eloquent recursion
     $category = Category::find(1);
     $descendants = $category->descendants()->get();
     
     // After: Recursive CTE
     $tree = DB::table('categories')
         ->withRecursiveExpression('tree', function ($query) {
             $query->from('categories')
                 ->whereNull('parent_id')
                 ->unionAll(
                     DB::table('categories')
                         ->select('categories.*')
                         ->join('tree', 'tree.id', '=', 'categories.parent_id')
                 );
         })
         ->get();
     

   • Validate cycle detection for deep hierarchies (PostgreSQL 14+/MariaDB 10.5.2).

4. Full Adoption:

   • Update Eloquent models to use CTEs where applicable (e.g., QueriesExpressions trait for Laravel < 5.8).
   • Document CTE patterns in the codebase