fix(mysql): show inherited charset and collation in structure editor

apps/desktop/src/lib/__tests__/table/mysqlTableCollation.spec.ts

@@ -0,0 +1,30 @@
+import { describe, expect, it } from "vitest";
+import type { QueryResult } from "@/types/database";
+import { mysqlTableCollationSql, parseMysqlTableCollation } from "@/lib/table/mysqlTableCollation";
+
+function result(columns: string[], rows: QueryResult["rows"]): QueryResult {
+  return { columns, rows, affected_rows: 0, execution_time_ms: 1 };
+}
+
+describe("mysqlTableCollation", () => {
+  it("builds mode-independent lookup SQL for quoted and Unicode names", () => {
+    const sql = mysqlTableCollationSql("db'x", "订单\\archive");
+    expect(sql).toContain("TABLE_COLLATION AS table_collation");
+    expect(sql).toContain("TABLE_SCHEMA = CONVERT(X'64622778' USING utf8mb4)");
+    expect(sql).toContain("TABLE_NAME = CONVERT(X'e8aea2e58d955c61726368697665' USING utf8mb4)");
+    expect(sql).not.toContain("db'x");
+  });
+
+  it("reads the reported collation regardless of column-name casing", () => {
+    expect(parseMysqlTableCollation(result(["TABLE_COLLATION"], [["utf8mb4_0900_ai_ci"]]))).toBe("utf8mb4_0900_ai_ci");
+    expect(parseMysqlTableCollation(result(["table_collation"], [[" utf8mb4_bin "]]))).toBe("utf8mb4_bin");
+  });
+
+  it("falls back to no table default when the server reports nothing usable", () => {
+    // MySQL reports TABLE_COLLATION as NULL for views, and the lookup itself may fail.
+    expect(parseMysqlTableCollation(result(["table_collation"], [[null]]))).toBe("");
+    expect(parseMysqlTableCollation(result(["table_collation"], []))).toBe("");
+    expect(parseMysqlTableCollation(result(["engine"], [["InnoDB"]]))).toBe("");
+    expect(parseMysqlTableCollation(undefined)).toBe("");
+  });
+});