From dc711bd7c69394788e6532ad9c89f5bdcb12b007 Mon Sep 17 00:00:00 2001
From: jasonchuan <jason_chuan@qq.com>
Date: Sun, 4 Feb 2024 14:12:39 +0800
Subject: [PATCH] let gorm support  limit and offset binding parameters,change
 the BindVar of postgres driver (#239)
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* Update postgres.go

if limit and offset use the parameter  in new gorm version，must remove config vars before bindvar to ,and then restore them.

* optimise the BindVarTo code to ensure   the code  more efficient

* fix"for bug "  for bindvar

* remove cases

* remove for logic

* just check the 0 index
---
 postgres.go | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/postgres.go b/postgres.go
index 960e067..50bb307 100644
--- a/postgres.go
+++ b/postgres.go
@@ -115,7 +115,15 @@ func (dialector Dialector) DefaultValueOf(field *schema.Field) clause.Expression
 
 func (dialector Dialector) BindVarTo(writer clause.Writer, stmt *gorm.Statement, v interface{}) {
 	writer.WriteByte('$')
-	writer.WriteString(strconv.Itoa(len(stmt.Vars)))
+	index := 0
+	varLen := len(stmt.Vars)
+	if varLen > 0 {
+		switch stmt.Vars[0].(type) {
+		case pgx.QueryExecMode:
+			index++
+		}
+	}
+	writer.WriteString(strconv.Itoa(varLen - index))
 }
 
 func (dialector Dialector) QuoteTo(writer clause.Writer, str string) {