snapshot of https://github.com/ent/ent.git (master, 2026-09-15; blobs > 131072B omitted)

entc/gen/template/dialect/sql/feature/lock.tmpl

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+{{/*
+Copyright 2019-present Facebook Inc. All rights reserved.
+This source code is licensed under the Apache 2.0 license found
+in the LICENSE file in the root directory of this source tree.
+*/}}
+
+{{/* gotype: entgo.io/ent/entc/gen.Type */}}
+
+{{/* Templates used by the "sql/lock" feature-flag to add "SELECT ... FOR UPDATE/SHARE" capabilities. */}}
+
+{{ define "dialect/sql/query/additional/locking" }}
+    {{ if $.FeatureEnabled "sql/lock" }}
+        {{ template "helper/sqlock" $ }}
+    {{ end }}
+{{ end }}
+
+{{ define "helper/sqlock" }}
+{{ $builder := pascal $.Scope.Builder }}
+{{ $receiver := $.Scope.Receiver }}
+
+// ForUpdate locks the selected rows against concurrent updates, and prevent them from being
+// updated, deleted or "selected ... for update" by other sessions, until the transaction is
+// either committed or rolled-back.
+func ({{ $receiver }} *{{ $builder }}) ForUpdate(opts ...sql.LockOption) *{{ $builder }} {
+    if {{ $receiver }}.driver.Dialect() == dialect.Postgres {
+        {{ $receiver }}.Unique(false)
+    }
+    {{ $receiver }}.modifiers = append({{ $receiver }}.modifiers, func(s *sql.Selector) {
+        s.ForUpdate(opts...)
+    })
+    return {{ $receiver }}
+}
+
+// ForShare behaves similarly to ForUpdate, except that it acquires a shared mode lock
+// on any rows that are read. Other sessions can read the rows, but cannot modify them
+// until your transaction commits.
+func ({{ $receiver }} *{{ $builder }}) ForShare(opts ...sql.LockOption) *{{ $builder }} {
+    if {{ $receiver }}.driver.Dialect() == dialect.Postgres {
+        {{ $receiver }}.Unique(false)
+    }
+    {{ $receiver }}.modifiers = append({{ $receiver }}.modifiers, func(s *sql.Selector) {
+        s.ForShare(opts...)
+    })
+    return {{ $receiver }}
+}
+{{ end }}