From 16579e00c6f018af089391ed8540448fc13e047f Mon Sep 17 00:00:00 2001
From: shiyu7 <65223714+shiyu7@users.noreply.github.com>
Date: Thu, 1 Jul 2021 06:27:12 +0800
Subject: [PATCH] fix: fix race issue in prepare method (#4487)

---
 prepare_stmt.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/prepare_stmt.go b/prepare_stmt.go
index 14570061..48a614b7 100644
--- a/prepare_stmt.go
+++ b/prepare_stmt.go
@@ -64,7 +64,7 @@ func (db *PreparedStmtDB) prepare(ctx context.Context, conn ConnPool, isTransact
 		db.Stmts[query] = Stmt{Stmt: stmt, Transaction: isTransaction}
 		db.PreparedSQL = append(db.PreparedSQL, query)
 	}
-	db.Mux.Unlock()
+	defer db.Mux.Unlock()
 
 	return db.Stmts[query], err
 }