From 061c2a5f43ccfcdbe0bf04a9a5203f4fc31fc63b Mon Sep 17 00:00:00 2001
From: Yasuhiro Matsumoto <mattn.jp@gmail.com>
Date: Wed, 8 Apr 2026 13:38:45 +0900
Subject: [PATCH] check stmtCacheSize before acquiring mutex in takeCachedStmt

stmtCacheSize is immutable after connection open, so checking it
before the lock avoids mutex overhead when cache is not enabled.
---
 sqlite3.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sqlite3.go b/sqlite3.go
index ef06c85..5861a2f 100644
--- a/sqlite3.go
+++ b/sqlite3.go
@@ -1906,14 +1906,14 @@ func (c *SQLiteConn) dbConnOpen() bool {
 }
 
 func (c *SQLiteConn) takeCachedStmt(query string) *SQLiteStmt {
-	if c == nil || query == "" {
+	if c == nil || query == "" || c.stmtCacheSize <= 0 {
 		return nil
 	}
 
 	c.mu.Lock()
 	defer c.mu.Unlock()
 
-	if c.db == nil || c.stmtCacheSize <= 0 {
+	if c.db == nil {
 		return nil
 	}
 	stmts := c.stmtCache[query]