diff --git a/sec-beidou/src/main/java/com/imdroid/beidou/controller/APIController.java b/sec-beidou/src/main/java/com/imdroid/beidou/controller/APIController.java
index d3913ff2..723c1b39 100644
--- a/sec-beidou/src/main/java/com/imdroid/beidou/controller/APIController.java
+++ b/sec-beidou/src/main/java/com/imdroid/beidou/controller/APIController.java
@@ -134,6 +134,7 @@ public class APIController extends BasicController{
         QueryWrapper<DeviceCacheCmd> queryWrapper = new QueryWrapper<>();
         queryWrapper.eq("deviceid",deviceId);
         queryWrapper.eq("syn",false);
+        queryWrapper.last("limit 1");
         DeviceCacheCmd cacheCmd = cacheCmdMapper.selectOne(queryWrapper);
         if(cacheCmd != null){
             rtcmClient.config(deviceId, cacheCmd.getCmd());
diff --git a/sec-beidou/src/main/java/com/imdroid/beidou/controller/GnssDeviceController.java b/sec-beidou/src/main/java/com/imdroid/beidou/controller/GnssDeviceController.java
index b6ad50e1..832d3905 100644
--- a/sec-beidou/src/main/java/com/imdroid/beidou/controller/GnssDeviceController.java
+++ b/sec-beidou/src/main/java/com/imdroid/beidou/controller/GnssDeviceController.java
@@ -176,6 +176,7 @@ public class GnssDeviceController extends BasicController{
         GnssDevice device = JSONObject.toJavaObject(object,GnssDevice.class);
         QueryWrapper<Tenant> tenantQueryWrapper = new QueryWrapper<>();
         tenantQueryWrapper.eq("name", device.getTenantname());
+        tenantQueryWrapper.last("limit 1");
         Tenant tenant = tenantMapper.selectOne(tenantQueryWrapper);
         if(tenant==null) return HttpResult.result(2, "invalid tenant");
 
diff --git a/sec-beidou/src/main/java/com/imdroid/beidou/controller/WarningController.java b/sec-beidou/src/main/java/com/imdroid/beidou/controller/WarningController.java
index 6ed44109..a19df5e6 100644
--- a/sec-beidou/src/main/java/com/imdroid/beidou/controller/WarningController.java
+++ b/sec-beidou/src/main/java/com/imdroid/beidou/controller/WarningController.java
@@ -120,6 +120,7 @@ public class WarningController extends BasicController implements CommonExcelSer
         QueryWrapper<WarningCfg> queryWrapper = new QueryWrapper<>();
         queryWrapper.eq("devicetype", cfg.getDevicetype());
         queryWrapper.eq("type", cfg.getType());
+        queryWrapper.last("limit 1");
         WarningCfg oldCfg = warningCfgMapper.selectOne(queryWrapper);
         if (oldCfg == null) {
             num = warningCfgMapper.insert(cfg);