From 3b1dc9c328c33e438b573950f3096d63c160b58e Mon Sep 17 00:00:00 2001
From: FFuchsi <56107867+FFuchsi@users.noreply.github.com>
Date: Tue, 26 Sep 2023 09:35:25 +0200
Subject: [PATCH] Added OrderByCase Expression (#14)

---
 expression_ext.go | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/expression_ext.go b/expression_ext.go
index c11d892e..d74aa004 100644
--- a/expression_ext.go
+++ b/expression_ext.go
@@ -559,6 +559,20 @@ func (e *expr) NotIn(values ...interface{}) *expr {
 	return e.in(" NOT", values...)
 }
 
+func (e *expr) OrderByCase(conditions ...interface{}) *expr {
+	e.expr = "(CASE " + e.expr
+
+	for i, condition := range conditions {
+		e.expr += " WHEN ? THEN ?"
+		e.args = append(e.args, condition, i+1)
+	}
+
+	e.expr += " ELSE ? END)"
+	e.args = append(e.args, len(conditions)+1)
+
+	return e
+}
+
 func (e *expr) OrderAsc() string {
 	return e.expr + " ASC "
 }