relational-database-web-cloudbase

## Sibling skills (local only) Sibling CloudBase skills ship beside this skill. Use local relative paths such as `../auth-tool-cloudbase/SKILL.md`. If a referenced sibling skill file is missing from this environment, ask the user to install the full CloudBase plugin (or the missing skill). Do **not** HTTP-fetch remote skill or protocol markdown into the agent context. # CloudBase Relational Database Web SDK ## Activation Contract ### Use this first when - A browser or Web app must keep using `@cloudbase/js-sdk` against an environment that **already has** CloudBase MySQL. - Do **not** choose this skill for a new relational app. New relational Web work uses `postgresql-development-cloudbase` and `app.rdb()`. ### Read before writing code if - You need to distinguish browser SDK usage from MCP database management or backend Node access. - The request mentions Supabase migration, shared frontend DB client, or browser-side table queries. ### Then also read - MySQL SQL management and MCP operations -> `../relational-database-mcp-cloudbase/SKILL.md` - Web auth/login -> `../auth-web-cloudbase/SKILL.md` - General Web app setup -> `../web-development/SKILL.md` ### Do NOT use for - MCP-based SQL management, schema changes, or permissions management (provisioning is not offered through MCP). - Backend/Node service access. - Document database operations. ### Common mistakes / gotchas - Initializing SDKs in an MCP management flow. - Treating `app` itself as the relational database client. - Re-initializing CloudBase in every component. - Mixing frontend browser access with admin-style schema mutations. ### Minimal checklist - Confirm the caller is a Web frontend. - Keep one shared CloudBase app and one shared relational DB client. - Route MySQL management/schema work on an existing instance to `relational-database-mcp-cloudbase` (it does not provision). If the task says PostgreSQL, CloudBase PG, PG mode, `app.rdb()`, `queryPgDatabase`, `managePgDatabase`, or RLS, route to `postgresql-development-cloudbase` instead. - Handle auth separately before data access. ## Overview This skill standardizes the **browser-side initialization pattern** for CloudBase Relational Database. After initialization, use `db` with Supabase-style query patterns. ## Installation ```bash npm install @cloudbase/js-sdk ``` ## Canonical initialization ```javascript import cloudbase from "@cloudbase/js-sdk"; const app = cloudbase.init({ env: "your-env-id" }); const auth = app.auth; // Handle login separately const db = app.rdb(); ``` ## Initialization rules - Initialize synchronously. - Do not lazy-load the SDK with `import("@cloudbase/js-sdk")` unless the framework absolutely requires it. - Create one shared `db` client and reuse it. - Do not invent unsupported `cloudbase.init()` options. ## Quick routing ### Use this skill when - you are wiring browser components to relational tables - you are replacing a Supabase browser client with CloudBase - you need a canonical shared frontend `db` client ### Use `relational-database-mcp-cloudbase` instead when - you need to create/destroy MySQL - you need MySQL DDL or write-SQL administration - you need to inspect or change MySQL table security rules through MCP ### Use `postgresql-development-cloudbase` instead when - the task says PostgreSQL, CloudBase PG, PG mode, `app.rdb()`, `queryPgDatabase`, `managePgDatabase`, PostgREST, or RLS - browser-side table code must use PG semantics rather than legacy NoSQL / MySQL management tools ## Example: shared frontend DB client ```javascript import cloudbase from "@cloudbase/js-sdk"; const app = cloudbase.init({ env: "your-env-id" }); export const db = app.rdb(); ``` ## Example: Supabase-style query ```javascript const { data, error } = await db .from("posts") .select("*") .order("created_at", { ascending: false }); if (error) { console.error("Failed to load posts", error.message); } ``` ## Example: insert / update / delete ```javascript await db.from("posts").insert({ title: "Hello" }); await db.from("posts").update({ title: "Updated" }).eq("id", 1); await db.from("posts").delete().eq("id", 1); ``` ## Key principle - `app.rdb()` gives you the relational database client. - After that point, use Supabase-style query knowledge for table operations. - Keep schema management and privileged administration outside browser code.