From 32031a7f53b6012d455e4abe2efda277d0e9a2ef Mon Sep 17 00:00:00 2001
From: what <what-00@qq.com>
Date: Mon, 24 Jul 2023 10:28:08 +0800
Subject: [PATCH] =?UTF-8?q?[fix]=20=E6=9D=A1=E4=BB=B6=E5=88=86=E6=94=AF?=
 =?UTF-8?q?=E4=B8=BA=E7=A9=BA=E6=97=B6,=20=E6=9E=84=E5=BB=BAsql=E9=94=99?=
 =?UTF-8?q?=E8=AF=AF?=
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---
 engine/engine_case.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/engine/engine_case.go b/engine/engine_case.go
index d508abb..d37e59c 100644
--- a/engine/engine_case.go
+++ b/engine/engine_case.go
@@ -11,6 +11,10 @@ type EngineCase[T any] struct {
 }
 
 func (this EngineCase[T]) ToSql(param contracts.ModelParam) db.Expression {
+	if this.predicate == nil || this.predicate.IsEmpty() {
+		return db.Raw("NULL")
+	}
+
 	return this.predicate.ToSql(param)
 }