2. Relation Query Language (RQL)

This chapter describes the Relation Query Language syntax and its implementation in CubicWeb.

• 2.1. Introduction
  • 2.1.1. Goals of RQL
  • 2.1.2. Comparison with existing languages
  • 2.1.3. The different types of queries
  • 2.1.4. RQL relation expressions
  • 2.1.5. RQL Operators
• 2.2. RQL syntax
  • 2.2.1. Reserved keywords
  • 2.2.2. Case
  • 2.2.3. Variables and typing
  • 2.2.4. Virtual relations
  • 2.2.5. Literal expressions
  • 2.2.6. Operators
  • 2.2.7. Search Query
  • 2.2.8. Available functions
  • 2.2.9. Examples
  • 2.2.10. Insertion query
  • 2.2.11. Update and relation creation queries
  • 2.2.12. Deletion query
• 2.3. Debugging RQL
  • 2.3.1. Available levels
  • 2.3.2. Enable verbose output
  • 2.3.3. Detect largest RQL queries
  • 2.3.4. API
• 2.4. Implementation
  • 2.4.1. BNF grammar
  • 2.4.2. Internal representation (syntactic tree)
  • 2.4.3. Known limitations
  • 2.4.4. Topics