diff --git a/frontend/src/components/ConnectionModal.tsx b/frontend/src/components/ConnectionModal.tsx
index ce4e813..4ad5c80 100644
--- a/frontend/src/components/ConnectionModal.tsx
+++ b/frontend/src/components/ConnectionModal.tsx
@@ -64,6 +64,13 @@ import { getCustomConnectionDsnValidationMessage } from "../utils/customConnecti
 import { mergeParsedUriValuesForForm } from "../utils/connectionUriMerge";
 import { buildRpcConnectionConfig } from "../utils/connectionRpcConfig";
 import { CUSTOM_CONNECTION_DRIVER_HELP } from "../utils/driverImportGuidance";
+import {
+  describeUnsupportedOceanBaseProtocol,
+  normalizeOceanBaseProtocol,
+  OCEANBASE_PROTOCOL_PARAM_KEYS,
+  resolveOceanBaseProtocolFromQueryText as resolveOceanBaseProtocolQueryText,
+  type OceanBaseProtocol,
+} from "../utils/oceanBaseProtocol";
 import {
   applyNoAutoCapAttributes,
   noAutoCapInputProps,
@@ -98,7 +105,7 @@ type ChoiceCardOption = {
   description?: string;
 };
 type ClickHouseProtocolChoice = "auto" | "http" | "native";
-type OceanBaseProtocolChoice = "mysql" | "oracle";
+type OceanBaseProtocolChoice = OceanBaseProtocol;
 const MAX_URI_LENGTH = 4096;
 const MAX_CONNECTION_PARAMS_LENGTH = 4096;
 const MAX_URI_HOSTS = 32;
@@ -122,15 +129,6 @@ const OCEANBASE_PROTOCOL_OPTIONS: Array<{
   { value: "mysql", label: "MySQL" },
   { value: "oracle", label: "Oracle" },
 ];
-const OCEANBASE_PROTOCOL_PARAM_KEYS = [
-  "protocol",
-  "oceanBaseProtocol",
-  "oceanbaseProtocol",
-  "tenantMode",
-  "compatMode",
-  "mode",
-];
-
 const normalizeClickHouseProtocolValue = (
   value: unknown,
 ): ClickHouseProtocolChoice => {
@@ -144,10 +142,7 @@ const normalizeClickHouseProtocolValue = (
 const normalizeOceanBaseProtocolValue = (
   value: unknown,
 ): OceanBaseProtocolChoice => {
-  const text = String(value || "")
-    .trim()
-    .toLowerCase();
-  return text === "oracle" ? "oracle" : "mysql";
+  return normalizeOceanBaseProtocol(value) || "mysql";
 };
 const resolveOceanBaseProtocolValue = (
   value: unknown,
@@ -156,29 +151,12 @@ const resolveOceanBaseProtocolValue = (
     .trim()
     .toLowerCase();
   if (!text) return undefined;
-  return ["oracle", "oracle-mode", "oracle_mode", "oboracle"].includes(text)
-    ? "oracle"
-    : "mysql";
+  return normalizeOceanBaseProtocol(text);
 };
 const resolveOceanBaseProtocolFromQueryText = (
   value: unknown,
 ): OceanBaseProtocolChoice | undefined => {
-  let text = String(value || "").trim();
-  if (!text) return undefined;
-  const queryIndex = text.indexOf("?");
-  if (queryIndex >= 0) {
-    text = text.slice(queryIndex + 1);
-  }
-  const hashIndex = text.indexOf("#");
-  if (hashIndex >= 0) {
-    text = text.slice(0, hashIndex);
-  }
-  const params = new URLSearchParams(text.replace(/^[?&]+/, ""));
-  for (const key of OCEANBASE_PROTOCOL_PARAM_KEYS) {
-    const protocol = resolveOceanBaseProtocolValue(params.get(key));
-    if (protocol) return protocol;
-  }
-  return undefined;
+  return resolveOceanBaseProtocolQueryText(value).protocol;
 };
 const resolveOceanBaseProtocolForConfig = (
   config: Partial<ConnectionConfig>,
@@ -1179,7 +1157,12 @@ const ConnectionModal: React.FC<{
     rawParams: unknown,
     selectedProtocol: OceanBaseProtocolChoice,
   ) => {
-    const params = new URLSearchParams(normalizeConnectionParamsText(rawParams));
+    const normalizedParamsText = normalizeConnectionParamsText(rawParams);
+    const protocolFromParams = resolveOceanBaseProtocolQueryText(normalizedParamsText);
+    if (protocolFromParams.unsupportedValue) {
+      throw new Error(describeUnsupportedOceanBaseProtocol(protocolFromParams.unsupportedValue));
+    }
+    const params = new URLSearchParams(normalizedParamsText);
     for (const key of OCEANBASE_PROTOCOL_PARAM_KEYS) {
       params.delete(key);
     }
@@ -4775,7 +4758,7 @@ const ConnectionModal: React.FC<{
                     <Form.Item
                       name="oceanBaseProtocol"
                       label="OceanBase 协议"
-                      help="MySQL 租户选择 MySQL；Oracle 租户选择 Oracle。该选择会同时影响连接测试、浏览表结构和 SQL 方言。"
+                      help="MySQL 租户选择 MySQL；Oracle 租户选择 Oracle。OceanBase 租户兼容模式不包含 Native，该选择会同时影响连接测试、浏览表结构和 SQL 方言。"
                       style={{ marginBottom: 0 }}
                     >
                       <Select
diff --git a/frontend/src/components/DefinitionViewer.tsx b/frontend/src/components/DefinitionViewer.tsx
index f462cd1..3d4476f 100644
--- a/frontend/src/components/DefinitionViewer.tsx
+++ b/frontend/src/components/DefinitionViewer.tsx
@@ -5,6 +5,7 @@ import { TabData } from '../types';
 import { useStore } from '../store';
 import { DBQuery } from '../../wailsjs/go/app/App';
 import { buildRpcConnectionConfig } from '../utils/connectionRpcConfig';
+import { normalizeOceanBaseProtocol } from '../utils/oceanBaseProtocol';
 
 interface DefinitionViewerProps {
     tab: TabData;
@@ -43,11 +44,11 @@ const DefinitionViewer: React.FC<DefinitionViewerProps> = ({ tab }) => {
         if (type === 'custom') {
             const driver = String(conn?.config?.driver || '').trim().toLowerCase();
             if (driver === 'diros' || driver === 'doris') return 'mysql';
-            if (driver === 'oceanbase') return 'mysql';
+            if (driver === 'oceanbase') return normalizeOceanBaseProtocol(conn?.config?.oceanBaseProtocol) === 'oracle' ? 'oracle' : 'mysql';
             if (driver === 'opengauss' || driver === 'open_gauss' || driver === 'open-gauss') return 'opengauss';
             return driver;
         }
-        if (type === 'oceanbase' && String(conn?.config?.oceanBaseProtocol || '').trim().toLowerCase() === 'oracle') return 'oracle';
+        if (type === 'oceanbase' && normalizeOceanBaseProtocol(conn?.config?.oceanBaseProtocol) === 'oracle') return 'oracle';
         if (type === 'mariadb' || type === 'oceanbase' || type === 'diros' || type === 'sphinx') return 'mysql';
         if (type === 'dameng') return 'dm';
         return type;
diff --git a/frontend/src/components/Sidebar.tsx b/frontend/src/components/Sidebar.tsx
index 80d166c..706a86e 100644
--- a/frontend/src/components/Sidebar.tsx
+++ b/frontend/src/components/Sidebar.tsx
@@ -48,6 +48,7 @@ import FindInDatabaseModal from './FindInDatabaseModal';
 import { buildRpcConnectionConfig } from '../utils/connectionRpcConfig';
 import { noAutoCapInputProps } from '../utils/inputAutoCap';
 import { normalizeSidebarViewName, resolveSidebarRuntimeDatabase } from '../utils/sidebarMetadata';
+import { normalizeOceanBaseProtocol } from '../utils/oceanBaseProtocol';
 import { resolveConnectionHostTokens } from '../utils/tabDisplay';
 import {
     findSidebarNodePathByKey,
@@ -686,11 +687,11 @@ const Sidebar: React.FC<{ onEditConnection?: (conn: SavedConnection) => void }>
       if (type === 'custom') {
           const driver = String(conn?.config?.driver || '').trim().toLowerCase();
           if (driver === 'diros' || driver === 'doris') return 'mysql';
-          if (driver === 'oceanbase') return 'mysql';
+          if (driver === 'oceanbase') return normalizeOceanBaseProtocol(conn?.config?.oceanBaseProtocol) === 'oracle' ? 'oracle' : 'mysql';
           if (driver === 'opengauss' || driver === 'open_gauss' || driver === 'open-gauss') return 'opengauss';
           return driver;
       }
-      if (type === 'oceanbase' && String(conn?.config?.oceanBaseProtocol || '').trim().toLowerCase() === 'oracle') return 'oracle';
+      if (type === 'oceanbase' && normalizeOceanBaseProtocol(conn?.config?.oceanBaseProtocol) === 'oracle') return 'oracle';
       if (type === 'mariadb' || type === 'oceanbase' || type === 'diros' || type === 'sphinx') return 'mysql';
       if (type === 'dameng') return 'dm';
       return type;
diff --git a/frontend/src/components/TableOverview.tsx b/frontend/src/components/TableOverview.tsx
index e5dcd92..1cb50bd 100644
--- a/frontend/src/components/TableOverview.tsx
+++ b/frontend/src/components/TableOverview.tsx
@@ -17,6 +17,7 @@ import {
     type TableOverviewSortField,
     type TableOverviewSortOrder,
 } from '../utils/tableOverviewFilter';
+import { normalizeOceanBaseProtocol } from '../utils/oceanBaseProtocol';
 
 interface TableOverviewProps {
     tab: TabData;
@@ -57,11 +58,11 @@ const getMetadataDialect = (connType: string, driver?: string, oceanBaseProtocol
     if (type === 'custom') {
         const d = (driver || '').trim().toLowerCase();
         if (d === 'diros' || d === 'doris') return 'mysql';
-        if (d === 'oceanbase') return 'mysql';
+        if (d === 'oceanbase') return normalizeOceanBaseProtocol(oceanBaseProtocol) === 'oracle' ? 'oracle' : 'mysql';
         if (d === 'opengauss' || d === 'open_gauss' || d === 'open-gauss') return 'opengauss';
         return d;
     }
-    if (type === 'oceanbase' && String(oceanBaseProtocol || '').trim().toLowerCase() === 'oracle') return 'oracle';
+    if (type === 'oceanbase' && normalizeOceanBaseProtocol(oceanBaseProtocol) === 'oracle') return 'oracle';
     if (type === 'mariadb' || type === 'oceanbase' || type === 'diros' || type === 'sphinx') return 'mysql';
     if (type === 'dameng') return 'dm';
     return type;
diff --git a/frontend/src/components/TriggerViewer.tsx b/frontend/src/components/TriggerViewer.tsx
index f326755..a27b061 100644
--- a/frontend/src/components/TriggerViewer.tsx
+++ b/frontend/src/components/TriggerViewer.tsx
@@ -5,6 +5,7 @@ import { TabData } from '../types';
 import { useStore } from '../store';
 import { DBQuery } from '../../wailsjs/go/app/App';
 import { buildRpcConnectionConfig } from '../utils/connectionRpcConfig';
+import { normalizeOceanBaseProtocol } from '../utils/oceanBaseProtocol';
 
 interface TriggerViewerProps {
     tab: TabData;
@@ -29,11 +30,11 @@ const TriggerViewer: React.FC<TriggerViewerProps> = ({ tab }) => {
         if (type === 'custom') {
             const driver = String(conn?.config?.driver || '').trim().toLowerCase();
             if (driver === 'diros' || driver === 'doris') return 'mysql';
-            if (driver === 'oceanbase') return 'mysql';
+            if (driver === 'oceanbase') return normalizeOceanBaseProtocol(conn?.config?.oceanBaseProtocol) === 'oracle' ? 'oracle' : 'mysql';
             if (driver === 'opengauss' || driver === 'open_gauss' || driver === 'open-gauss') return 'opengauss';
             return driver;
         }
-        if (type === 'oceanbase' && String(conn?.config?.oceanBaseProtocol || '').trim().toLowerCase() === 'oracle') return 'oracle';
+        if (type === 'oceanbase' && normalizeOceanBaseProtocol(conn?.config?.oceanBaseProtocol) === 'oracle') return 'oracle';
         if (type === 'mariadb' || type === 'oceanbase' || type === 'diros' || type === 'sphinx') return 'mysql';
         if (type === 'dameng') return 'dm';
         return type;
diff --git a/frontend/src/store.test.ts b/frontend/src/store.test.ts
index 95d9c74..66ea765 100644
--- a/frontend/src/store.test.ts
+++ b/frontend/src/store.test.ts
@@ -119,6 +119,36 @@ describe('store appearance persistence', () => {
     expect(useStore.getState().connections[0]?.config.password).toBe('secret');
   });
 
+  it('does not fail hydration when persisted OceanBase connection uses unsupported native protocol', async () => {
+    storage.setItem('lite-db-storage', JSON.stringify({
+      state: {
+        connections: [
+          {
+            id: 'oceanbase-native',
+            name: 'OceanBase Native',
+            config: {
+              id: 'oceanbase-native',
+              type: 'oceanbase',
+              host: 'ob.local',
+              port: 2881,
+              user: 'root@test',
+              oceanBaseProtocol: 'mysql',
+              connectionParams: 'protocol=native',
+            },
+          },
+        ],
+      },
+      version: 9,
+    }));
+
+    const { useStore } = await importStore();
+    const config = useStore.getState().connections[0]?.config;
+
+    expect(useStore.getState().connections).toHaveLength(1);
+    expect(config?.connectionParams).toBe('protocol=native');
+    expect(config?.oceanBaseProtocol).toBe('mysql');
+  });
+
   it('preserves JVM Arthas diagnostic config when replacing saved connections', async () => {
     const { useStore } = await importStore();
 
@@ -294,6 +324,32 @@ describe('store appearance persistence', () => {
     );
   });
 
+  it('keeps saved OceanBase native protocol loadable for connect-time rejection', async () => {
+    const { useStore } = await importStore();
+
+    expect(() => useStore.getState().replaceConnections([
+      {
+        id: 'oceanbase-native',
+        name: 'OceanBase Native',
+        config: {
+          id: 'oceanbase-native',
+          type: 'oceanbase',
+          host: 'ob.local',
+          port: 2881,
+          user: 'root@test',
+          oceanBaseProtocol: 'mysql',
+          connectionParams: 'protocol=native',
+        },
+      },
+    ])).not.toThrow();
+    expect(useStore.getState().connections[0]?.config.connectionParams).toBe(
+      'protocol=native',
+    );
+    expect(useStore.getState().connections[0]?.config.oceanBaseProtocol).toBe(
+      'mysql',
+    );
+  });
+
   it('normalizes OceanBase protocol when updating a saved connection', async () => {
     const { useStore } = await importStore();
 
diff --git a/frontend/src/store.ts b/frontend/src/store.ts
index e085ffb..728985f 100644
--- a/frontend/src/store.ts
+++ b/frontend/src/store.ts
@@ -34,6 +34,11 @@ import {
   sanitizeDataGridDisplaySettings,
   type DataGridDisplaySettings,
 } from "./utils/dataGridDisplay";
+import {
+  normalizeOceanBaseProtocol,
+  resolveOceanBaseProtocolFromConfig,
+  resolveOceanBaseProtocolFromQueryText,
+} from "./utils/oceanBaseProtocol";
 
 export interface AppearanceSettings extends DataGridDisplaySettings {
   enabled: boolean;
@@ -78,68 +83,26 @@ const DEFAULT_GLOBAL_PROXY: GlobalProxyConfig = {
   password: "",
   hasPassword: false,
 };
-const OCEANBASE_PROTOCOL_PARAM_KEYS = [
-  "protocol",
-  "oceanBaseProtocol",
-  "oceanbaseProtocol",
-  "tenantMode",
-  "compatMode",
-  "mode",
-];
-const normalizeOceanBaseProtocol = (
-  value: unknown,
-): "mysql" | "oracle" | undefined => {
-  const normalized = String(value ?? "").trim().toLowerCase();
-  if (!normalized) {
-    return undefined;
-  }
-  return normalized === "oracle" ||
-    normalized === "oracle-mode" ||
-    normalized === "oracle_mode" ||
-    normalized === "oboracle"
-    ? "oracle"
-    : "mysql";
-};
-const resolveOceanBaseProtocolFromQueryText = (
-  value: unknown,
-): "mysql" | "oracle" | undefined => {
-  let text = String(value ?? "").trim();
-  if (!text) {
-    return undefined;
-  }
-  const queryIndex = text.indexOf("?");
-  if (queryIndex >= 0) {
-    text = text.slice(queryIndex + 1);
-  }
-  const hashIndex = text.indexOf("#");
-  if (hashIndex >= 0) {
-    text = text.slice(0, hashIndex);
-  }
-  const params = new URLSearchParams(text.replace(/^[?&]+/, ""));
-  for (const key of OCEANBASE_PROTOCOL_PARAM_KEYS) {
-    const protocol = normalizeOceanBaseProtocol(params.get(key));
-    if (protocol) {
-      return protocol;
-    }
-  }
-  return undefined;
-};
 const resolveOceanBaseProtocol = (
   raw: Record<string, unknown>,
   normalizedConnectionParams: string,
   normalizedUri: string,
 ): "mysql" | "oracle" => {
-  if (Object.prototype.hasOwnProperty.call(raw, "oceanBaseProtocol")) {
-    const explicitProtocol = normalizeOceanBaseProtocol(raw.oceanBaseProtocol);
-    if (explicitProtocol) {
-      return explicitProtocol;
-    }
+  const normalizedConfig = {
+    ...raw,
+    connectionParams: normalizedConnectionParams,
+    uri: normalizedUri,
+  };
+  try {
+    return resolveOceanBaseProtocolFromConfig(normalizedConfig);
+  } catch {
+    return (
+      normalizeOceanBaseProtocol(raw.oceanBaseProtocol) ||
+      resolveOceanBaseProtocolFromQueryText(normalizedConnectionParams).protocol ||
+      resolveOceanBaseProtocolFromQueryText(normalizedUri).protocol ||
+      "mysql"
+    );
   }
-  return (
-    resolveOceanBaseProtocolFromQueryText(normalizedConnectionParams) ||
-    resolveOceanBaseProtocolFromQueryText(normalizedUri) ||
-    "mysql"
-  );
 };
 const SUPPORTED_CONNECTION_TYPES = new Set([
   "mysql",
diff --git a/frontend/src/types.ts b/frontend/src/types.ts
index 9b31cfd..18a4a7b 100644
--- a/frontend/src/types.ts
+++ b/frontend/src/types.ts
@@ -299,7 +299,7 @@ export interface ConnectionConfig {
   redisDB?: number; // Redis database index (0-15)
   uri?: string; // Connection URI for copy/paste
   clickHouseProtocol?: "auto" | "http" | "native"; // ClickHouse connection protocol override
-  oceanBaseProtocol?: "mysql" | "oracle"; // OceanBase tenant protocol
+  oceanBaseProtocol?: "mysql" | "oracle"; // OceanBase tenant compatibility protocol
   hosts?: string[]; // Multi-host addresses: host:port
   topology?: "single" | "replica" | "cluster";
   mysqlReplicaUser?: string;
diff --git a/frontend/src/utils/connectionModalPresentation.ts b/frontend/src/utils/connectionModalPresentation.ts
index a45e896..1a520f4 100644
--- a/frontend/src/utils/connectionModalPresentation.ts
+++ b/frontend/src/utils/connectionModalPresentation.ts
@@ -96,7 +96,7 @@ const CONNECTION_CONFIG_SECTION_COPY: Record<
   },
   oceanBaseProtocol: {
     title: 'OceanBase 协议',
-    description: '明确选择 MySQL 租户协议或 Oracle 租户协议。',
+    description: '明确选择 MySQL 或 Oracle 租户兼容协议。',
   },
   mongoDiscovery: {
     title: 'MongoDB 寻址',
diff --git a/frontend/src/utils/connectionRpcConfig.test.ts b/frontend/src/utils/connectionRpcConfig.test.ts
index 74ce6e3..b8f64b8 100644
--- a/frontend/src/utils/connectionRpcConfig.test.ts
+++ b/frontend/src/utils/connectionRpcConfig.test.ts
@@ -110,6 +110,31 @@ describe('buildRpcConnectionConfig', () => {
     expect(result.connectionParams).toBe('protocol=mysql');
   });
 
+  it('rejects unsupported OceanBase native protocol instead of falling back to MySQL', () => {
+    expect(() => buildRpcConnectionConfig({
+      id: 'conn-oceanbase-native',
+      type: 'oceanbase',
+      host: 'ob.local',
+      port: 2881,
+      user: 'root@test',
+      database: 'app',
+      connectionParams: 'protocol=native',
+    } as any)).toThrow(/不支持.*native/);
+  });
+
+  it('rejects unsupported OceanBase protocol even when form protocol is explicit MySQL', () => {
+    expect(() => buildRpcConnectionConfig({
+      id: 'conn-oceanbase-native-masked',
+      type: 'oceanbase',
+      host: 'ob.local',
+      port: 2881,
+      user: 'root@test',
+      database: 'app',
+      oceanBaseProtocol: 'mysql',
+      connectionParams: 'protocol=native',
+    } as any)).toThrow(/不支持.*native/);
+  });
+
   it('preserves extra connection params for RPC calls', () => {
     const result = buildRpcConnectionConfig({
       id: 'conn-mysql',
diff --git a/frontend/src/utils/connectionRpcConfig.ts b/frontend/src/utils/connectionRpcConfig.ts
index c400476..c096bee 100644
--- a/frontend/src/utils/connectionRpcConfig.ts
+++ b/frontend/src/utils/connectionRpcConfig.ts
@@ -1,4 +1,8 @@
 import { connection } from '../../wailsjs/go/models';
+import {
+  OCEANBASE_PROTOCOL_PARAM_KEYS,
+  resolveOceanBaseProtocolFromConfig,
+} from './oceanBaseProtocol';
 
 export type RpcConnectionConfig = connection.ConnectionConfig & { id?: string };
 type ConnectionConfigInput = {
@@ -11,15 +15,6 @@ type ConnectionConfigInput = {
 type SSHConfigInput = Record<string, any>;
 type ProxyConfigInput = Record<string, any>;
 type HttpTunnelConfigInput = Record<string, any>;
-type OceanBaseProtocol = 'mysql' | 'oracle';
-const OCEANBASE_PROTOCOL_PARAM_KEYS = [
-  'protocol',
-  'oceanBaseProtocol',
-  'oceanbaseProtocol',
-  'tenantMode',
-  'compatMode',
-  'mode',
-];
 
 const toStringValue = (value: unknown, fallback = ''): string => {
   if (typeof value === 'string') {
@@ -79,59 +74,12 @@ const normalizeHttpTunnelConfig = (value: unknown): connection.HTTPTunnelConfig
   });
 };
 
-const normalizeOceanBaseProtocol = (value: unknown): OceanBaseProtocol | undefined => {
-  const normalized = toStringValue(value).trim().toLowerCase();
-  if (!normalized) {
-    return undefined;
-  }
-  return normalized === 'oracle' || normalized === 'oracle-mode' || normalized === 'oracle_mode' || normalized === 'oboracle'
-    ? 'oracle'
-    : 'mysql';
-};
-
-const resolveOceanBaseProtocolFromQueryText = (raw: unknown): OceanBaseProtocol | undefined => {
-  let text = toStringValue(raw).trim();
-  if (!text) {
-    return undefined;
-  }
-  const queryStart = text.indexOf('?');
-  if (queryStart >= 0) {
-    text = text.slice(queryStart + 1);
-  }
-  const hashStart = text.indexOf('#');
-  if (hashStart >= 0) {
-    text = text.slice(0, hashStart);
-  }
-  const params = new URLSearchParams(text.replace(/^[?&]+/, ''));
-  for (const key of OCEANBASE_PROTOCOL_PARAM_KEYS) {
-    const protocol = normalizeOceanBaseProtocol(params.get(key));
-    if (protocol) {
-      return protocol;
-    }
-  }
-  return undefined;
-};
-
-const resolveOceanBaseProtocol = (config: ConnectionConfigInput): OceanBaseProtocol => {
-  if (Object.prototype.hasOwnProperty.call(config, 'oceanBaseProtocol')) {
-    const explicitProtocol = normalizeOceanBaseProtocol(config.oceanBaseProtocol);
-    if (explicitProtocol) {
-      return explicitProtocol;
-    }
-  }
-  return (
-    resolveOceanBaseProtocolFromQueryText(config.connectionParams) ||
-    resolveOceanBaseProtocolFromQueryText(config.uri) ||
-    'mysql'
-  );
-};
-
 const withOceanBaseProtocolParam = (config: ConnectionConfigInput): ConnectionConfigInput => {
   const type = toStringValue(config.type).trim().toLowerCase();
   if (type !== 'oceanbase') {
     return config;
   }
-  const selectedProtocol = resolveOceanBaseProtocol(config);
+  const selectedProtocol = resolveOceanBaseProtocolFromConfig(config);
   const params = new URLSearchParams(toStringValue(config.connectionParams));
   for (const key of OCEANBASE_PROTOCOL_PARAM_KEYS) {
     params.delete(key);
diff --git a/frontend/src/utils/dataSourceCapabilities.test.ts b/frontend/src/utils/dataSourceCapabilities.test.ts
index af458ef..425d9fa 100644
--- a/frontend/src/utils/dataSourceCapabilities.test.ts
+++ b/frontend/src/utils/dataSourceCapabilities.test.ts
@@ -40,4 +40,16 @@ describe('dataSourceCapabilities', () => {
       supportsApproximateTableCount: true,
     });
   });
+
+  it('treats custom OceanBase Oracle driver as Oracle capabilities', () => {
+    expect(getDataSourceCapabilities({
+      type: 'custom',
+      driver: 'oceanbase',
+      oceanBaseProtocol: 'oracle',
+    })).toMatchObject({
+      type: 'oracle',
+      preferManualTotalCount: true,
+      supportsApproximateTableCount: true,
+    });
+  });
 });
diff --git a/frontend/src/utils/dataSourceCapabilities.ts b/frontend/src/utils/dataSourceCapabilities.ts
index c7b52ea..2784ccf 100644
--- a/frontend/src/utils/dataSourceCapabilities.ts
+++ b/frontend/src/utils/dataSourceCapabilities.ts
@@ -1,4 +1,5 @@
 import type { ConnectionConfig } from '../types';
+import { normalizeOceanBaseProtocol } from './oceanBaseProtocol';
 
 type ConnectionLike = Pick<ConnectionConfig, 'type' | 'driver' | 'oceanBaseProtocol'> | null | undefined;
 
@@ -25,9 +26,12 @@ export const resolveDataSourceType = (config: ConnectionLike): string => {
   const type = normalizeDataSourceToken(String(config.type || ''));
   if (type === 'custom') {
     const driver = normalizeDataSourceToken(String(config.driver || ''));
+    if (driver === 'oceanbase' && normalizeOceanBaseProtocol(config.oceanBaseProtocol) === 'oracle') {
+      return 'oracle';
+    }
     return driver || 'custom';
   }
-  if (type === 'oceanbase' && String(config.oceanBaseProtocol || '').trim().toLowerCase() === 'oracle') {
+  if (type === 'oceanbase' && normalizeOceanBaseProtocol(config.oceanBaseProtocol) === 'oracle') {
     return 'oracle';
   }
   return type;
diff --git a/frontend/src/utils/oceanBaseProtocol.ts b/frontend/src/utils/oceanBaseProtocol.ts
new file mode 100644
index 0000000..37aecc4
--- /dev/null
+++ b/frontend/src/utils/oceanBaseProtocol.ts
@@ -0,0 +1,109 @@
+export type OceanBaseProtocol = 'mysql' | 'oracle';
+
+export const OCEANBASE_PROTOCOL_PARAM_KEYS = [
+  'protocol',
+  'oceanBaseProtocol',
+  'oceanbaseProtocol',
+  'tenantMode',
+  'compatMode',
+  'mode',
+];
+
+type OceanBaseProtocolResolution = {
+  protocol?: OceanBaseProtocol;
+  unsupportedValue?: string;
+  unsupportedKey?: string;
+};
+
+const normalizeToken = (value: unknown): string => String(value ?? '').trim().toLowerCase();
+
+export const normalizeOceanBaseProtocol = (value: unknown): OceanBaseProtocol | undefined => {
+  const normalized = normalizeToken(value);
+  if (!normalized) {
+    return undefined;
+  }
+  if (normalized === 'oracle' || normalized === 'oracle-mode' || normalized === 'oracle_mode' || normalized === 'oboracle') {
+    return 'oracle';
+  }
+  if (normalized === 'mysql' || normalized === 'mysql-compatible' || normalized === 'mysql_compatible' || normalized === 'mysql-mode' || normalized === 'mysql_mode' || normalized === 'obmysql') {
+    return 'mysql';
+  }
+  return undefined;
+};
+
+export const isUnsupportedOceanBaseProtocolValue = (value: unknown): boolean => {
+  const normalized = normalizeToken(value);
+  return normalized !== '' && !normalizeOceanBaseProtocol(normalized);
+};
+
+export const describeUnsupportedOceanBaseProtocol = (value: unknown): string => {
+  const raw = String(value ?? '').trim();
+  const label = raw ? ` "${raw}"` : '';
+  return `OceanBase 当前仅支持 MySQL/Oracle 租户协议，不支持${label}；请改为 MySQL 或 Oracle。`;
+};
+
+export const resolveOceanBaseProtocolFromQueryText = (raw: unknown): OceanBaseProtocolResolution => {
+  let text = String(raw ?? '').trim();
+  if (!text) {
+    return {};
+  }
+  const queryStart = text.indexOf('?');
+  if (queryStart >= 0) {
+    text = text.slice(queryStart + 1);
+  }
+  const hashStart = text.indexOf('#');
+  if (hashStart >= 0) {
+    text = text.slice(0, hashStart);
+  }
+  const params = new URLSearchParams(text.replace(/^[?&]+/, ''));
+  for (const key of OCEANBASE_PROTOCOL_PARAM_KEYS) {
+    const value = params.get(key);
+    if (value == null || String(value).trim() === '') {
+      continue;
+    }
+    const protocol = normalizeOceanBaseProtocol(value);
+    if (protocol) {
+      return { protocol };
+    }
+    return { unsupportedValue: value, unsupportedKey: key };
+  }
+  return {};
+};
+
+export const resolveOceanBaseProtocolFromConfig = (config: Record<string, unknown>): OceanBaseProtocol => {
+  const paramsProtocol = resolveOceanBaseProtocolFromQueryText(config.connectionParams);
+  const uriProtocol = resolveOceanBaseProtocolFromQueryText(config.uri);
+
+  if (Object.prototype.hasOwnProperty.call(config, 'oceanBaseProtocol')) {
+    const value = config.oceanBaseProtocol;
+    const protocol = normalizeOceanBaseProtocol(value);
+    if (isUnsupportedOceanBaseProtocolValue(value)) {
+      throw new Error(describeUnsupportedOceanBaseProtocol(value));
+    }
+    if (paramsProtocol.unsupportedValue) {
+      throw new Error(describeUnsupportedOceanBaseProtocol(paramsProtocol.unsupportedValue));
+    }
+    if (uriProtocol.unsupportedValue) {
+      throw new Error(describeUnsupportedOceanBaseProtocol(uriProtocol.unsupportedValue));
+    }
+    if (protocol) {
+      return protocol;
+    }
+  }
+
+  if (paramsProtocol.unsupportedValue) {
+    throw new Error(describeUnsupportedOceanBaseProtocol(paramsProtocol.unsupportedValue));
+  }
+  if (paramsProtocol.protocol) {
+    return paramsProtocol.protocol;
+  }
+
+  if (uriProtocol.unsupportedValue) {
+    throw new Error(describeUnsupportedOceanBaseProtocol(uriProtocol.unsupportedValue));
+  }
+  return uriProtocol.protocol || 'mysql';
+};
+
+export const resolveOceanBaseProtocolForDialect = (value: unknown): OceanBaseProtocol => (
+  normalizeOceanBaseProtocol(value) || 'mysql'
+);
diff --git a/frontend/src/utils/sidebarMetadata.ts b/frontend/src/utils/sidebarMetadata.ts
index a2b1d26..3bd5d8a 100644
--- a/frontend/src/utils/sidebarMetadata.ts
+++ b/frontend/src/utils/sidebarMetadata.ts
@@ -1,3 +1,5 @@
+import { normalizeOceanBaseProtocol } from './oceanBaseProtocol';
+
 const splitQualifiedName = (qualifiedName: string): { schemaName: string; objectName: string } => {
   const raw = String(qualifiedName || '').trim();
   if (!raw) return { schemaName: '', objectName: '' };
@@ -18,12 +20,14 @@ const normalizeSidebarConnectionDialect = (type: string, driver: string, oceanBa
     if (normalizedDriver === 'postgresql' || normalizedDriver === 'postgres' || normalizedDriver === 'pg') return 'postgres';
     if (normalizedDriver === 'opengauss' || normalizedDriver === 'open_gauss' || normalizedDriver === 'open-gauss') return 'opengauss';
     if (normalizedDriver === 'dameng' || normalizedDriver === 'dm' || normalizedDriver === 'dm8') return 'dm';
-    if (normalizedDriver === 'oceanbase') return 'mysql';
+    if (normalizedDriver === 'oceanbase') {
+      return normalizeOceanBaseProtocol(oceanBaseProtocol) === 'oracle' ? 'oracle' : 'mysql';
+    }
     if (normalizedDriver.includes('oracle')) return 'oracle';
     return normalizedDriver;
   }
   if (normalizedType === 'oceanbase') {
-    return String(oceanBaseProtocol || '').trim().toLowerCase() === 'oracle' ? 'oracle' : 'mysql';
+    return normalizeOceanBaseProtocol(oceanBaseProtocol) === 'oracle' ? 'oracle' : 'mysql';
   }
   if (normalizedType === 'open_gauss' || normalizedType === 'open-gauss') return 'opengauss';
   if (normalizedType === 'dameng') return 'dm';
diff --git a/frontend/src/utils/sqlDialect.test.ts b/frontend/src/utils/sqlDialect.test.ts
index f8e67a6..b96ebb5 100644
--- a/frontend/src/utils/sqlDialect.test.ts
+++ b/frontend/src/utils/sqlDialect.test.ts
@@ -23,6 +23,7 @@ describe('sqlDialect', () => {
     expect(resolveSqlDialect('custom', 'mariadb')).toBe('mariadb');
     expect(resolveSqlDialect('custom', 'open_gauss')).toBe('opengauss');
     expect(resolveSqlDialect('OceanBase', '', { oceanBaseProtocol: 'oracle' })).toBe('oracle');
+    expect(resolveSqlDialect('custom', 'oceanbase', { oceanBaseProtocol: 'oracle' })).toBe('oracle');
     expect(isMysqlFamilyDialect('mariadb')).toBe(true);
     expect(isMysqlFamilyDialect('oceanbase')).toBe(true);
     expect(isMysqlFamilyDialect('oracle')).toBe(false);
diff --git a/frontend/src/utils/sqlDialect.ts b/frontend/src/utils/sqlDialect.ts
index 1d543eb..859b4e7 100644
--- a/frontend/src/utils/sqlDialect.ts
+++ b/frontend/src/utils/sqlDialect.ts
@@ -1,3 +1,5 @@
+import { resolveOceanBaseProtocolForDialect } from './oceanBaseProtocol';
+
 export type ColumnTypeOption = { value: string };
 
 export type SqlFunctionCompletion = {
@@ -34,9 +36,7 @@ const optionValues = (values: string[]): ColumnTypeOption[] => values.map((value
 
 const normalizeRawDialect = (value: string): string => String(value || '').trim().toLowerCase();
 
-export const normalizeOceanBaseSqlProtocol = (value: unknown): 'mysql' | 'oracle' => (
-  String(value || '').trim().toLowerCase() === 'oracle' ? 'oracle' : 'mysql'
-);
+export const normalizeOceanBaseSqlProtocol = resolveOceanBaseProtocolForDialect;
 
 export const resolveSqlDialect = (
   rawType: string,
diff --git a/internal/app/app_cache_key_test.go b/internal/app/app_cache_key_test.go
index b977753..6f487b1 100644
--- a/internal/app/app_cache_key_test.go
+++ b/internal/app/app_cache_key_test.go
@@ -211,3 +211,50 @@ func TestGetCacheKey_OceanBaseProtocolParamWinsOverAliases(t *testing.T) {
 		t.Fatalf("expected explicit protocol=mysql to win over alias, got %s vs %s", left, right)
 	}
 }
+
+func TestGetCacheKey_OceanBaseExplicitProtocolOverridesConnectionParams(t *testing.T) {
+	base := connection.ConnectionConfig{
+		Type:             "oceanbase",
+		Host:             "ob.local",
+		Port:             2881,
+		User:             "root@test",
+		Database:         "app",
+		ConnectionParams: "connectTimeout=10",
+	}
+	modified := base
+	modified.OceanBaseProtocol = "mysql"
+	modified.ConnectionParams = "protocol=oracle&connectTimeout=10"
+
+	left := getCacheKey(base)
+	right := getCacheKey(modified)
+	if left != right {
+		t.Fatalf("expected explicit OceanBase protocol=mysql to override params protocol=oracle, got %s vs %s", left, right)
+	}
+}
+
+func TestGetCacheKey_KeepOceanBaseUnsupportedProtocolIsolation(t *testing.T) {
+	base := connection.ConnectionConfig{
+		Type:             "oceanbase",
+		Host:             "ob.local",
+		Port:             2881,
+		User:             "root@test",
+		Database:         "app",
+		ConnectionParams: "protocol=mysql",
+	}
+	modified := base
+	modified.ConnectionParams = "protocol=native"
+
+	left := getCacheKey(base)
+	right := getCacheKey(modified)
+	if left == right {
+		t.Fatalf("expected unsupported OceanBase protocol to stay isolated from MySQL cache key")
+	}
+
+	masked := base
+	masked.OceanBaseProtocol = "mysql"
+	masked.ConnectionParams = "protocol=native"
+
+	if left == getCacheKey(masked) {
+		t.Fatalf("expected unsupported OceanBase params protocol to stay isolated even with explicit mysql")
+	}
+}
diff --git a/internal/app/oceanbase_protocol.go b/internal/app/oceanbase_protocol.go
index c668cc9..59b995d 100644
--- a/internal/app/oceanbase_protocol.go
+++ b/internal/app/oceanbase_protocol.go
@@ -8,29 +8,53 @@ import (
 )
 
 func normalizeOceanBaseProtocolForApp(raw string) string {
-	switch strings.ToLower(strings.TrimSpace(raw)) {
+	normalized := strings.ToLower(strings.TrimSpace(raw))
+	switch normalized {
 	case "oracle", "oracle-mode", "oracle_mode", "oboracle":
 		return "oracle"
-	case "mysql", "mysql-compatible", "mysql_compatible", "mysql-mode", "mysql_mode":
+	case "mysql", "mysql-compatible", "mysql_compatible", "mysql-mode", "mysql_mode", "obmysql":
 		return "mysql"
 	default:
-		return "mysql"
+		return normalized
 	}
 }
 
+func isSupportedOceanBaseProtocolForApp(protocol string) bool {
+	return protocol == "mysql" || protocol == "oracle"
+}
+
 func resolveOceanBaseProtocolForApp(config connection.ConnectionConfig) string {
 	if !strings.EqualFold(strings.TrimSpace(config.Type), "oceanbase") {
 		return ""
 	}
+	explicitProtocol := ""
 	if explicit := strings.TrimSpace(config.OceanBaseProtocol); explicit != "" {
-		return normalizeOceanBaseProtocolForApp(explicit)
+		explicitProtocol = normalizeOceanBaseProtocolForApp(explicit)
+		if !isSupportedOceanBaseProtocolForApp(explicitProtocol) {
+			return explicitProtocol
+		}
 	}
 	if protocol := resolveOceanBaseProtocolParam(config.ConnectionParams); protocol != "" {
+		if !isSupportedOceanBaseProtocolForApp(protocol) {
+			return protocol
+		}
+		if explicitProtocol != "" {
+			return explicitProtocol
+		}
 		return protocol
 	}
 	if protocol := resolveOceanBaseProtocolParam(config.URI); protocol != "" {
+		if !isSupportedOceanBaseProtocolForApp(protocol) {
+			return protocol
+		}
+		if explicitProtocol != "" {
+			return explicitProtocol
+		}
 		return protocol
 	}
+	if explicitProtocol != "" {
+		return explicitProtocol
+	}
 	return "mysql"
 }
 
@@ -57,7 +81,7 @@ func resolveOceanBaseProtocolParam(raw string) string {
 	return ""
 }
 
-func normalizeOceanBaseConnectionParamsForCache(raw string) string {
+func stripOceanBaseConnectionParamsForCache(raw string) string {
 	text := strings.TrimSpace(raw)
 	if text == "" {
 		return ""
@@ -69,26 +93,40 @@ func normalizeOceanBaseConnectionParamsForCache(raw string) string {
 	if len(values) == 0 {
 		return ""
 	}
-	protocol := resolveOceanBaseProtocolParam(raw)
 	for _, key := range []string{"protocol", "oceanBaseProtocol", "oceanbaseProtocol", "tenantMode", "compatMode", "mode"} {
 		values.Del(key)
 	}
-	if strings.EqualFold(protocol, "oracle") {
-		values.Set("protocol", "oracle")
-	}
 	return values.Encode()
 }
 
+func normalizeOceanBaseConnectionParamsForCache(raw string) string {
+	normalized := stripOceanBaseConnectionParamsForCache(raw)
+	protocol := resolveOceanBaseProtocolParam(raw)
+	if protocol != "" && !strings.EqualFold(protocol, "mysql") {
+		values, err := url.ParseQuery(strings.TrimLeft(strings.TrimSpace(normalized), "?&"))
+		if err != nil {
+			values = url.Values{}
+		}
+		values.Set("protocol", protocol)
+		return values.Encode()
+	}
+	return normalized
+}
+
 func normalizeOceanBaseConnectionParamsForCacheWithProtocol(raw string, protocol string) string {
-	normalized := normalizeOceanBaseConnectionParamsForCache(raw)
-	if !strings.EqualFold(protocol, "oracle") {
+	resolvedProtocol := normalizeOceanBaseProtocolForApp(protocol)
+	if resolvedProtocol == "" {
+		return normalizeOceanBaseConnectionParamsForCache(raw)
+	}
+	normalized := stripOceanBaseConnectionParamsForCache(raw)
+	if strings.EqualFold(resolvedProtocol, "mysql") {
 		return normalized
 	}
 	values, err := url.ParseQuery(strings.TrimLeft(strings.TrimSpace(normalized), "?&"))
 	if err != nil {
 		values = url.Values{}
 	}
-	values.Set("protocol", "oracle")
+	values.Set("protocol", resolvedProtocol)
 	return values.Encode()
 }
 
diff --git a/internal/connection/types.go b/internal/connection/types.go
index 7b6b7fd..359ddf5 100644
--- a/internal/connection/types.go
+++ b/internal/connection/types.go
@@ -104,7 +104,7 @@ type ConnectionConfig struct {
 	RedisDB              int              `json:"redisDB,omitempty"`              // Redis database index (0-15)
 	URI                  string           `json:"uri,omitempty"`                  // Connection URI for copy/paste
 	ClickHouseProtocol   string           `json:"clickHouseProtocol,omitempty"`   // auto | http | native
-	OceanBaseProtocol    string           `json:"oceanBaseProtocol,omitempty"`    // mysql | oracle
+	OceanBaseProtocol    string           `json:"oceanBaseProtocol,omitempty"`    // OceanBase tenant compatibility protocol: mysql | oracle
 	Hosts                []string         `json:"hosts,omitempty"`                // Multi-host addresses: host:port
 	Topology             string           `json:"topology,omitempty"`             // single | replica | cluster
 	MySQLReplicaUser     string           `json:"mysqlReplicaUser,omitempty"`     // MySQL replica auth user
diff --git a/internal/db/oceanbase_impl.go b/internal/db/oceanbase_impl.go
index 9ebdcc9..947c2aa 100644
--- a/internal/db/oceanbase_impl.go
+++ b/internal/db/oceanbase_impl.go
@@ -151,36 +151,62 @@ func normalizeOceanBaseProtocol(raw string) string {
 	switch strings.ToLower(strings.TrimSpace(raw)) {
 	case oceanBaseProtocolOracle, "oracle-mode", "oracle_mode", "oboracle":
 		return oceanBaseProtocolOracle
-	case oceanBaseProtocolMySQL, "mysql-compatible", "mysql_compatible", "mysql-mode", "mysql_mode", "":
+	case oceanBaseProtocolMySQL, "mysql-compatible", "mysql_compatible", "mysql-mode", "mysql_mode", "obmysql", "":
 		return oceanBaseProtocolMySQL
 	default:
-		return oceanBaseProtocolMySQL
+		return ""
 	}
 }
 
-func resolveOceanBaseProtocolFromValues(values url.Values) string {
+func unsupportedOceanBaseProtocolError(raw string) error {
+	return fmt.Errorf("OceanBase 当前仅支持 MySQL/Oracle 租户协议，不支持 %q；请改为 MySQL 或 Oracle", strings.TrimSpace(raw))
+}
+
+func resolveOceanBaseProtocolFromValues(values url.Values) (string, error) {
 	if len(values) == 0 {
-		return ""
+		return "", nil
 	}
 	for _, key := range []string{"protocol", "oceanBaseProtocol", "oceanbaseProtocol", "tenantMode", "compatMode", "mode"} {
 		if value := strings.TrimSpace(values.Get(key)); value != "" {
-			return normalizeOceanBaseProtocol(value)
+			protocol := normalizeOceanBaseProtocol(value)
+			if protocol == "" {
+				return "", unsupportedOceanBaseProtocolError(value)
+			}
+			return protocol, nil
 		}
 	}
-	return ""
+	return "", nil
 }
 
-func resolveOceanBaseProtocol(config connection.ConnectionConfig) string {
+func resolveOceanBaseProtocol(config connection.ConnectionConfig) (string, error) {
+	explicitProtocol := ""
 	if explicit := strings.TrimSpace(config.OceanBaseProtocol); explicit != "" {
-		return normalizeOceanBaseProtocol(explicit)
+		protocol := normalizeOceanBaseProtocol(explicit)
+		if protocol == "" {
+			return "", unsupportedOceanBaseProtocolError(explicit)
+		}
+		explicitProtocol = protocol
 	}
-	if protocol := resolveOceanBaseProtocolFromValues(connectionParamsFromText(config.ConnectionParams)); protocol != "" {
-		return protocol
+	if protocol, err := resolveOceanBaseProtocolFromValues(connectionParamsFromText(config.ConnectionParams)); err != nil {
+		return "", err
+	} else if protocol != "" {
+		if explicitProtocol != "" {
+			return explicitProtocol, nil
+		}
+		return protocol, nil
 	}
-	if protocol := resolveOceanBaseProtocolFromValues(connectionParamsFromURI(config.URI, "oceanbase", "mysql")); protocol != "" {
-		return protocol
+	if protocol, err := resolveOceanBaseProtocolFromValues(connectionParamsFromURI(config.URI, "oceanbase", "mysql")); err != nil {
+		return "", err
+	} else if protocol != "" {
+		if explicitProtocol != "" {
+			return explicitProtocol, nil
+		}
+		return protocol, nil
 	}
-	return oceanBaseProtocolMySQL
+	if explicitProtocol != "" {
+		return explicitProtocol, nil
+	}
+	return oceanBaseProtocolMySQL, nil
 }
 
 func stripOceanBaseProtocolParams(raw string) string {
@@ -256,7 +282,10 @@ func (o *OceanBaseDB) Connect(config connection.ConnectionConfig) error {
 	o.oracle = nil
 	o.protocol = oceanBaseProtocolMySQL
 	appliedConfig := applyOceanBaseURI(config)
-	protocol := resolveOceanBaseProtocol(appliedConfig)
+	protocol, err := resolveOceanBaseProtocol(appliedConfig)
+	if err != nil {
+		return err
+	}
 	runConfig := withoutOceanBaseProtocolParams(appliedConfig)
 	if protocol == oceanBaseProtocolOracle {
 		logger.Infof("OceanBase 使用 Oracle 协议连接：地址=%s:%d 用户=%s", runConfig.Host, runConfig.Port, runConfig.User)
diff --git a/internal/db/oceanbase_impl_test.go b/internal/db/oceanbase_impl_test.go
index a289b47..9dd3cd7 100644
--- a/internal/db/oceanbase_impl_test.go
+++ b/internal/db/oceanbase_impl_test.go
@@ -79,13 +79,52 @@ func TestResolveOceanBaseProtocol(t *testing.T) {
 		tt := tt
 		t.Run(tt.name, func(t *testing.T) {
 			t.Parallel()
-			if got := resolveOceanBaseProtocol(tt.config); got != tt.want {
+			got, err := resolveOceanBaseProtocol(tt.config)
+			if err != nil {
+				t.Fatalf("resolveOceanBaseProtocol() unexpected error: %v", err)
+			}
+			if got != tt.want {
 				t.Fatalf("resolveOceanBaseProtocol() = %q, want %q", got, tt.want)
 			}
 		})
 	}
 }
 
+func TestResolveOceanBaseProtocolRejectsUnsupportedNative(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name   string
+		config connection.ConnectionConfig
+	}{
+		{
+			name: "params native",
+			config: connection.ConnectionConfig{
+				Type:             "oceanbase",
+				ConnectionParams: "protocol=native",
+			},
+		},
+		{
+			name: "explicit mysql does not mask params native",
+			config: connection.ConnectionConfig{
+				Type:              "oceanbase",
+				OceanBaseProtocol: "mysql",
+				ConnectionParams:  "protocol=native",
+			},
+		},
+	}
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			_, err := resolveOceanBaseProtocol(tt.config)
+			if err == nil || !strings.Contains(err.Error(), "不支持") {
+				t.Fatalf("expected unsupported protocol error, got %v", err)
+			}
+		})
+	}
+}
+
 func TestWithoutOceanBaseProtocolParamsStripsDriverMeta(t *testing.T) {
 	t.Parallel()