kotlin: support postgresql uuid (#1022)

Co-authored-by: Kyle Conroy <kyle@conroy.org>

Author: eivindr

internal/codegen/kotlin/gen.go

@@ -107,6 +107,9 @@ func jdbcSet(t ktType, idx int, name string) string {
 	if t.IsInstant() {
 		return fmt.Sprintf("stmt.setTimestamp(%d, Timestamp.from(%s))", idx, name)
 	}
+	if t.IsUUID() {
+		return fmt.Sprintf("stmt.setObject(%d, %s)", idx, name)
+	}
 	return fmt.Sprintf("stmt.set%s(%d, %s)", t.Name, idx, name)
 }
 
@@ -159,6 +162,13 @@ func jdbcGet(t ktType, idx int) string {
 	if t.IsInstant() {
 		return fmt.Sprintf(`results.getTimestamp(%d).toInstant()`, idx)
 	}
+	if t.IsUUID() {
+		var nullCast string
+		if t.IsNull {
+			nullCast = "?"
+		}
+		return fmt.Sprintf(`results.getObject(%d) as%s %s`, idx, nullCast, t.Name)
+	}
 	return fmt.Sprintf(`results.get%s(%d)`, t.Name, idx)
 }
 
@@ -350,6 +360,10 @@ func (t ktType) IsInstant() bool {
 	return t.Name == "Instant"
 }
 
+func (t ktType) IsUUID() bool {
+	return t.Name == "UUID"
+}
+
 func makeType(r *compiler.Result, col *compiler.Column, settings config.CombinedSettings) ktType {
 	typ, isEnum := ktInnerType(r, col, settings)
 	return ktType{

internal/codegen/kotlin/imports.go

@@ -83,6 +83,9 @@ func (i *importer) modelImports() [][]string {
 	if i.usesType("OffsetDateTime") {
 		std["java.time.OffsetDateTime"] = struct{}{}
 	}
+	if i.usesType("UUID") {
+		std["java.util.UUID"] = struct{}{}
+	}
 
 	stds := make([]string, 0, len(std))
 	for s := range std {
@@ -114,6 +117,10 @@ func stdImports(uses func(name string) bool) map[string]struct{} {
 	if uses("OffsetDateTime") {
 		std["java.time.OffsetDateTime"] = struct{}{}
 	}
+	if uses("UUID") {
+		std["java.util.UUID"] = struct{}{}
+	}
+
 	return std
 }
 

internal/codegen/kotlin/postgresql_type.go

@@ -67,8 +67,7 @@ func postgresType(r *compiler.Result, col *compiler.Column, settings config.Comb
 		return "String", false
 
 	case "uuid":
-		// TODO
-		return "uuid.UUID", false
+		return "UUID", false
 
 	case "inet":
 		// TODO