From bdb30da0a7af4329238ba2a17b46860aa4d18a65 Mon Sep 17 00:00:00 2001
From: Jinzhu <wosmvp@gmail.com>
Date: Wed, 21 Oct 2020 15:47:46 +0800
Subject: [PATCH] Fix copy lock for prepared statement, close #3642, #3607

---
 gorm.go         | 1 +
 prepare_stmt.go | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/gorm.go b/gorm.go
index e5c4a8a4..affa8e69 100644
--- a/gorm.go
+++ b/gorm.go
@@ -117,6 +117,7 @@ func Open(dialector Dialector, config *Config) (db *DB, err error) {
 	preparedStmt := &PreparedStmtDB{
 		ConnPool:    db.ConnPool,
 		Stmts:       map[string]*sql.Stmt{},
+		Mux:         &sync.RWMutex{},
 		PreparedSQL: make([]string, 0, 100),
 	}
 	db.cacheStore.Store("preparedStmt", preparedStmt)
diff --git a/prepare_stmt.go b/prepare_stmt.go
index 14a6aaec..eddee1f2 100644
--- a/prepare_stmt.go
+++ b/prepare_stmt.go
@@ -9,7 +9,7 @@ import (
 type PreparedStmtDB struct {
 	Stmts       map[string]*sql.Stmt
 	PreparedSQL []string
-	Mux         sync.RWMutex
+	Mux         *sync.RWMutex
 	ConnPool
 }