From 9c6627547cde6c6f1ec442718d60f3daa4c7c9fa Mon Sep 17 00:00:00 2001
From: Gwynne Raskind <gwynne@vapor.codes>
Date: Tue, 2 Aug 2022 15:15:30 -0500
Subject: [PATCH] Provide the correct PostgreSQL syntax for SELECT locking
 clauses via the new SQLDialect properties.

---
 Sources/PostgresKit/PostgresDialect.swift | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Sources/PostgresKit/PostgresDialect.swift b/Sources/PostgresKit/PostgresDialect.swift
index 8080a18..efa7379 100644
--- a/Sources/PostgresKit/PostgresDialect.swift
+++ b/Sources/PostgresKit/PostgresDialect.swift
@@ -59,4 +59,12 @@ public struct PostgresDialect: SQLDialect {
     public var unionFeatures: SQLUnionFeatures {
         [.union, .unionAll, .intersect, .intersectAll, .except, .exceptAll, .explicitDistinct, .parenthesizedSubqueries]
     }
+
+    public var sharedSelectLockExpression: SQLExpression? {
+        SQLRaw("FOR SHARE")
+    }
+
+    public var exclusiveSelectLockExpression: SQLExpression? {
+        SQLRaw("FOR UPDATE")
+    }
 }