From 34782fcafbf759ae3c2ba5f3d3d6d2d1144f0289 Mon Sep 17 00:00:00 2001
From: wjk <1471511095@qq.com>
Date: Tue, 28 Jul 2026 17:19:24 +0800
Subject: [PATCH] =?UTF-8?q?fix(data-gateway):=20MySQL/MariaDB=20=E5=8F=AA?=
 =?UTF-8?q?=E8=AF=BB=E4=BA=8B=E5=8A=A1=E9=A1=BB=E5=85=88=20SET=20=E5=86=8D?=
 =?UTF-8?q?=20BEGIN?=
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MySQL/MariaDB 要求 SET TRANSACTION 在事务开始前执行；
原先 beginTransaction 后再 SET 会导致数据源 test 失败。

Fixes #91
---
 packages/data-gateway/src/adapters/sql-family-adapters.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/data-gateway/src/adapters/sql-family-adapters.ts b/packages/data-gateway/src/adapters/sql-family-adapters.ts
index 83e9999e..4970d547 100644
--- a/packages/data-gateway/src/adapters/sql-family-adapters.ts
+++ b/packages/data-gateway/src/adapters/sql-family-adapters.ts
@@ -127,8 +127,9 @@ export class MySqlAdapter implements DataSourceAdapter {
     };
     try {
       signal?.addEventListener("abort", abort, { once: true });
-      await connection.beginTransaction();
+      // SET TRANSACTION must run before a transaction starts (MySQL/MariaDB).
       await connection.query("SET TRANSACTION READ ONLY");
+      await connection.beginTransaction();
       const [rows] = await connection.query<RowDataPacket[]>(sql, values);
       await connection.rollback();
       return rows.filter(isRecord);