From ab589716efc19b62452c1a27366ec14b76ec8c53 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BC=A0=E4=B8=87=E4=B9=89?= <zhang516307288@163.com>
Date: Mon, 31 Aug 2026 11:12:28 +0800
Subject: [PATCH] [BugFix] Fix ECM TooManyResultsException when querying after
 abnormal restart (#5316)

When ECM abnormally shuts down and restarts, duplicate records may exist in the
database causing MyBatis selectOne() to throw TooManyResultsException. This fix
adds LIMIT 1 to single-result queries in NodeManagerMapper to prevent the
exception when multiple records are unexpectedly returned.

Affected queries:
- getNodeInstance: LIMIT 1 added
- getNodeInstanceByTicketId: LIMIT 1 added
- getEMNodeInstanceByEngineNode: LIMIT 1 added
---
 .../src/main/resources/mapper/common/NodeManagerMapper.xml     | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/linkis-computation-governance/linkis-manager/linkis-manager-persistence/src/main/resources/mapper/common/NodeManagerMapper.xml b/linkis-computation-governance/linkis-manager/linkis-manager-persistence/src/main/resources/mapper/common/NodeManagerMapper.xml
index 04ff4286b70..d69cf0e9a91 100644
--- a/linkis-computation-governance/linkis-manager/linkis-manager-persistence/src/main/resources/mapper/common/NodeManagerMapper.xml
+++ b/linkis-computation-governance/linkis-manager/linkis-manager-persistence/src/main/resources/mapper/common/NodeManagerMapper.xml
@@ -134,12 +134,14 @@
         SELECT *
         FROM linkis_cg_manager_service_instance
         WHERE instance = #{instance}
+        LIMIT 1
     </select>
 
     <select id="getNodeInstanceByTicketId" resultType="org.apache.linkis.manager.common.entity.persistence.PersistenceNode">
         SELECT *
         FROM linkis_cg_manager_service_instance
         WHERE ticketId = #{ticketId}
+        LIMIT 1
     </select>
 
     <select id="getNodeInstanceById" resultType="org.apache.linkis.manager.common.entity.persistence.PersistenceNode">
@@ -156,6 +158,7 @@
         FROM linkis_cg_manager_engine_em
         WHERE engine_instance = #{instance}
         )
+        LIMIT 1
     </select>
 
     <select id="getNodeInstances" resultType="org.apache.linkis.manager.common.entity.persistence.PersistenceNode">