Module Caqti_template.VersionSource

Opaque version with comparison.

This version number module is intended for dispatching on details about an SQL intepreter or other relevant aspects of a relational database system. The only constructor is private, instead the Infix module provides direct comparison to strings for ideomatic usage in the query-returning callback of request templates.

Note that a version can be undefined, in which case it will compare like the empty string.