project setup

src/server/api/root.ts

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+import { createTRPCRouter } from "~/server/api/trpc";
+
+export const appRouter = createTRPCRouter({});
+
+export type AppRouter = typeof appRouter;

src/server/api/trpc.ts

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+import { initTRPC } from "@trpc/server";
+import { type CreateNextContextOptions } from "@trpc/server/adapters/next";
+import superjson from "superjson";
+import { ZodError } from "zod";
+
+import { db } from "~/server/db";
+
+/**
+ * 1. CONTEXT
+ */
+
+type CreateContextOptions = Record<string, never>;
+
+const createInnerTRPCContext = (_opts: CreateContextOptions) => {
+  return {
+    db,
+  };
+};
+
+export const createTRPCContext = (_opts: CreateNextContextOptions) => {
+  return createInnerTRPCContext({});
+};
+
+/**
+ * 2. INITIALIZATION
+ */
+
+const t = initTRPC.context<typeof createTRPCContext>().create({
+  transformer: superjson,
+  errorFormatter({ shape, error }) {
+    return {
+      ...shape,
+      data: {
+        ...shape.data,
+        zodError:
+          error.cause instanceof ZodError ? error.cause.flatten() : null,
+      },
+    };
+  },
+});
+
+/**
+ * 3. ROUTER & PROCEDURE (THE IMPORTANT BIT)
+ */
+
+export const createTRPCRouter = t.router;
+
+export const publicProcedure = t.procedure;

src/server/db/index.ts

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+import { Client } from "@planetscale/database";
+import { drizzle } from "drizzle-orm/planetscale-serverless";
+
+import { env } from "~/env";
+import * as schema from "./schema";
+
+export const db = drizzle(
+  new Client({
+    url: env.DATABASE_URL,
+  }).connection(),
+  { schema },
+);

src/server/db/schema.ts

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+import { mysqlTableCreator } from "drizzle-orm/mysql-core";
+
+export const mysqlTable = mysqlTableCreator(name => `me_${name}`);