fix(mysql): allow create database without selection

apps/desktop/src/composables/__tests__/useSqlExecution.spec.ts

@@ -0,0 +1,49 @@
+import { describe, expect, it } from "vitest";
+import { requiresDatabaseSelection } from "../useSqlExecution";
+import type { ConnectionConfig, QueryTab } from "@/types/database";
+
+function connection(dbType: ConnectionConfig["db_type"]): ConnectionConfig {
+  return {
+    id: "conn-1",
+    name: "Local",
+    db_type: dbType,
+    host: "localhost",
+    port: 3306,
+    username: "root",
+    password: "",
+  };
+}
+
+function queryTab(database = ""): QueryTab {
+  return {
+    id: "tab-1",
+    connectionId: "conn-1",
+    database,
+    schema: undefined,
+    title: "SQL",
+    sql: "",
+    mode: "query",
+    isDirty: false,
+    isExecuting: false,
+    isCancelling: false,
+    isExplaining: false,
+  };
+}
+
+describe("requiresDatabaseSelection", () => {
+  it("allows MySQL CREATE DATABASE to run without a selected database", () => {
+    expect(requiresDatabaseSelection(queryTab(), connection("mysql"), "CREATE DATABASE app_db")).toBe(false);
+  });
+
+  it("allows MySQL CREATE SCHEMA with options to run without a selected database", () => {
+    expect(requiresDatabaseSelection(queryTab(), connection("mysql"), "CREATE SCHEMA `app-db` DEFAULT CHARACTER SET utf8mb4")).toBe(false);
+  });
+
+  it("requires a database when a MySQL batch includes non-creation statements", () => {
+    expect(requiresDatabaseSelection(queryTab(), connection("mysql"), "CREATE DATABASE app_db; SELECT * FROM users")).toBe(true);
+  });
+
+  it("still requires a database for ordinary MySQL queries", () => {
+    expect(requiresDatabaseSelection(queryTab(), connection("mysql"), "SELECT * FROM users")).toBe(true);
+  });
+});

apps/desktop/src/composables/useSqlExecution.ts

@@ -14,6 +14,7 @@ import { extractSqlParameters } from "@/lib/sqlParameters";
 import type { ConnectionConfig, QueryTab } from "@/types/database";
 
 const DANGER_RE = /^\s*(DROP|DELETE|TRUNCATE|ALTER|UPDATE|MERGE|REPLACE)\b/i;
+const CONNECTION_LEVEL_CREATE_DATABASE_RE = /^\s*CREATE\s+(?:DATABASE|SCHEMA)\s+(?:IF\s+NOT\s+EXISTS\s+)?[`"[\]\w$.-]+/i;
 
 export function stripSqlComments(sql: string): string {
   return sql
@@ -72,7 +73,7 @@ export function useSqlExecution(deps: {
     const tab = deps.activeTab.value;
     const sql = await resolvedExecutableSql(sqlOverride);
     if (!tab || !sql.trim()) return;
-    if (requiresDatabaseSelection(tab, deps.activeConnection.value)) {
+    if (requiresDatabaseSelection(tab, deps.activeConnection.value, sql)) {
       deps.onMissingDatabase?.();
       return;
     }
@@ -118,7 +119,7 @@ export function useSqlExecution(deps: {
     sql ??= await resolvedExecutableSql();
     const tab = deps.activeTab.value;
     if (!tab || !sql.trim()) return;
-    if (requiresDatabaseSelection(tab, deps.activeConnection.value)) {
+    if (requiresDatabaseSelection(tab, deps.activeConnection.value, sql)) {
       deps.onMissingDatabase?.();
       return;
     }
@@ -226,9 +227,21 @@ function supportsSqlTemplateParameters(connection: ConnectionConfig | undefined)
   return connection.db_type !== "redis" && connection.db_type !== "mongodb";
 }
 
-function requiresDatabaseSelection(tab: QueryTab, connection: ConnectionConfig | undefined): boolean {
+function canExecuteWithoutSelectedDatabase(connection: ConnectionConfig, sql: string): boolean {
+  if (connection.db_type !== "mysql") return false;
+  const statements = stripSqlComments(sql)
+    .split(";")
+    .map((stmt) => stmt.trim())
+    .filter(Boolean);
+  // Only connection-level database creation may bypass the selected-database guard.
+  if (statements.length !== 1) return false;
+  return CONNECTION_LEVEL_CREATE_DATABASE_RE.test(statements[0]);
+}
+
+export function requiresDatabaseSelection(tab: QueryTab, connection: ConnectionConfig | undefined, sql = ""): boolean {
   if (tab.mode !== "query") return false;
   if (!connection || tab.database) return false;
   if (isSingleDatabase(connection.db_type)) return false;
+  if (canExecuteWithoutSelectedDatabase(connection, sql)) return false;
   return !["elasticsearch", "qdrant", "milvus", "weaviate", "chromadb", "zookeeper"].includes(connection.db_type);
 }