dbx Dialect

dialect

Dialect abstraction for dbx and sqltmplx. Capabilities are layered; implement only what you need.

Capability layers

Layer	Interface	Required	Used by
Contract	`Name()`, `BindVar(n)`	Yes	sqltmplx render, dbx render, validate
Dialect	Contract + `QuoteIdent`, `RenderLimitOffset`	Yes for query DSL	dbx query build
QueryFeaturesProvider	`QueryFeatures()`	Optional	dbx render (upsert, RETURNING, excluded ref). Fallback: `DefaultQueryFeatures(name)` for known dialects
SchemaDialect	Dialect + DDL/inspect (in dbx)	Optional	schema migrate, AutoMigrate

Adding a new dialect

Implement dialect.Dialect (Contract + QuoteIdent + RenderLimitOffset).
Implement dialect.QueryFeaturesProvider to declare upsert/returning support (or rely on DefaultQueryFeatures if your dialect matches a known one).
For schema migration: implement dbx.SchemaDialect (BuildCreateTable, InspectTable, etc.) or rely on Atlas when supported.
For sqltmplx validation: register a parser via validate.Register(dialectName, factory).

No need to add dialect branches in render.go, schema_migrate_atlas.go, or sqltmplx—capabilities are declared via interfaces.