SvGrid Studio · live SQL

What this example shows

Data-app Studio (live SQL) - the same Studio stack, but backed by a REAL Postgres running entirely in your browser via PGlite (WASM). No server.

`createSqlDataSource` turns the grid's sort / filter / page requests into parameterized SQL and runs them through PGlite's `query(text, params)`. Every action below executes actual Postgres - watch the SQL under the toolbar update as you sort, filter, and page.

Imports, features and API used

Imports: @electric-sql/pglite, @svgrid/grid, @svgrid/enterprise, ../shared/SvGridStudio.svelte

Source code (193-studio-live-sql.svelte)

<script lang="ts">
  /**
   * Data-app Studio (live SQL) - the same Studio stack, but backed by a REAL
   * Postgres running entirely in your browser via PGlite (WASM). No server.
   *
   * `createSqlDataSource` turns the grid's sort / filter / page requests into
   * parameterized SQL and runs them through PGlite's `query(text, params)`.
   * Every action below executes actual Postgres - watch the SQL under the
   * toolbar update as you sort, filter, and page.
   */
  import { PGlite } from '@electric-sql/pglite'
  import { SvGrid, createServerDataSource, type ServerState } from '@svgrid/grid'
  import {
    SvGridEditPanel,
    createSqlDataSource,
    schemaToColumns,
    type EntitySchema,
  } from '@svgrid/enterprise'
  import SvGridStudio from '../shared/SvGridStudio.svelte'

  type Customer = {
    id: number
    name: string
    email: string
    tier: string
    mrr: number
    active: boolean
  }

  const schema: EntitySchema<Customer> = {
    name: 'customers',
    label: 'Customer',
    idField: 'id',
    fields: [
      { field: 'id', type: 'number', primaryKey: true, readonly: true },
      { field: 'name', type: 'text', required: true, minLength: 2 },
      { field: 'email', type: 'text', label: 'Email', required: true, format: 'email' },
      {
        field: 'tier',
        type: 'enum',
        options: [
          { value: 'free', label: 'Free' },
          { value: 'pro', label: 'Pro' },
          { value: 'enterprise', label: 'Enterprise' },
        ],
      },
      { field: 'mrr', type: 'number', label: 'MRR ($)', min: 0 },
      { field: 'active', type: 'boolean' },
    ],
  }

  const columns = schemaToColumns(schema)

  let ready = $state(false)
  let lastSql = $state('')
  let editing = $state<Customer | null | undefined>(undefined)
  let selected = $state<Customer[]>([])

  let view = $state<ServerState<Customer>>({
    rows: [], total: 0, loading: false, saving: false, error: null,
    pageIndex: 0, pageSize: 10, pageCount: 1, sortModel: [], filterModel: {},
  })

  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  let controller: any

  const SEED = [
    ['Ada Lovelace', '[email protected]', 'enterprise', 1200, true],
    ['Alan Turing', '[email protected]', 'pro', 240, true],
    ['Grace Hopper', '[email protected]', 'enterprise', 980, true],
    ['Edsger Dijkstra', '[email protected]', 'free', 0, false],
    ['Barbara Liskov', '[email protected]', 'pro', 300, true],
    ['Donald Knuth', '[email protected]', 'enterprise', 1500, true],
    ['Margaret Hamilton', '[email protected]', 'pro', 420, true],
    ['Tim Berners-Lee', '[email protected]', 'enterprise', 1100, true],
    ['Linus Torvalds', '[email protected]', 'pro', 360, true],
    ['Katherine Johnson', '[email protected]', 'enterprise', 890, true],
    ['Dennis Ritchie', '[email protected]', 'pro', 275, false],
    ['Radia Perlman', '[email protected]', 'enterprise', 760, true],
    ['Ken Thompson', '[email protected]', 'pro', 310, true],
    ['Frances Allen', '[email protected]', 'free', 0, false],
    ['Vint Cerf', '[email protected]', 'enterprise', 1320, true],
    ['Guido van Rossum', '[email protected]', 'pro', 340, true],
    ['Bjarne Stroustrup', '[email protected]', 'enterprise', 720, true],
    ['Anita Borg', '[email protected]', 'pro', 410, true],
    ['John McCarthy', '[email protected]', 'free', 0, false],
    ['Shafi Goldwasser', '[email protected]', 'enterprise', 1180, true],
  ] as const

  async function init() {
    const db = new PGlite() // in-memory Postgres (WASM)
    await db.exec(`
      CREATE TABLE customers (
        id SERIAL PRIMARY KEY,
        name TEXT NOT NULL,
        email TEXT NOT NULL,
        tier TEXT,
        mrr INTEGER,
        active BOOLEAN
      );
    `)
    for (const [name, email, tier, mrr, active] of SEED) {
      await db.query('INSERT INTO customers (name, email, tier, mrr, active) VALUES ($1, $2, $3, $4, $5)', [
        name, email, tier, mrr, active,
      ])
    }

    const source = createSqlDataSource<Customer>({
      schema,
      table: 'customers',
      dialect: { placeholders: '$', ilike: true },
      execute: async (text, params) => {
        // Show the interesting query (the SELECT / INSERT / UPDATE / DELETE),
        // not the COUNT(*) that follows each read.
        if (!text.startsWith('SELECT COUNT(')) lastSql = text
        const res = await db.query(text, params)
        return res.rows as Record<string, unknown>[]
      },
    })

    controller = createServerDataSource<Customer>(source, {
      pageSize: 10,
      optimistic: true,
      getRowId: (r) => String(r.id),
      onChange: (s) => (view = s),
    })
    controller.refresh()
    ready = true
  }
  init()

  async function save({ mode, id, values }: { mode: 'create' | 'edit'; id: string | null; values: Partial<Customer> }) {
    if (mode === 'create') {
      await controller.createRow(values)
      controller.setPage(view.pageCount - 1) // jump to the new row (appended at the end)
    } else if (id) {
      await controller.updateRow(id, values)
    }
    editing = undefined
  }
  async function removeSelected() {
    for (const row of selected) await controller.deleteRow(String(row.id))
    selected = []
  }
</script>

<SvGridStudio
  title="Live SQL"
  subtitle="A real Postgres running in your browser (<code>PGlite</code>, WASM). Every action is actual SQL."
>
  {#snippet actions()}
    <span class="st-badge st-badge--live">● Postgres · WASM · no server</span>
  {/snippet}

  {#if !ready}
    <div class="live__loading">Booting Postgres in the browser…</div>
  {:else}
    <div class="st__toolbar">
      <button class="st-btn st-btn--primary" onclick={() => (editing = null)}>+ New customer</button>
      <button class="st-btn" disabled={selected.length === 0} onclick={removeSelected}>
        Delete{selected.length ? ` (${selected.length})` : ''}
      </button>
    </div>

    <div class="live__sql"><span>SQL</span> <code>{lastSql}</code></div>

    <SvGrid responsive={true}
      data={view.rows}
      {columns}
      loading={view.loading}
      fitColumns
      enableRowSummaries={false}
      showRowSelection
      sortable
      externalSort
      onSortingChange={(s) => controller.setSort(s)}
      filterable
      filterMode="row"
      externalFilter
      onFiltersChange={(f) =>
        controller.setFilter({
          global: f.global || undefined,
          columns: Object.fromEntries(
            f.columns.map((c) => [c.id, { operator: c.operator, value: c.value, valueTo: c.valueTo, selectedValues: c.selectedValues }]),
          ),
        })}
      onRowDoubleClick={(e) => (editing = e.row)}
      onRowSelectionChange={(_sel, rows) => (selected = rows)}
      showPagination
      externalPagination
      rowCount={view.total}
      pageIndex={view.pageIndex}
      pageSize={view.pageSize}
      onPaginationChange={({ pageIndex, pageSize }) => {
        if (pageSize !== view.pageSize) controller.setPageSize(pageSize)
        else controller.setPage(pageIndex)
      }}
      containerHeight={340}
    />

    {#if editing !== undefined}
      <SvGridEditPanel {schema} row={editing} presentation="modal" persistKey="studio" onSubmit={save} onCancel={() => (editing = undefined)} />
    {/if}
  {/if}
</SvGridStudio>

<style>
  .live__loading { padding: 40px; text-align: center; color: var(--sg-muted, #888); }
  .live__sql { display: flex; align-items: center; gap: 8px; font-size: 12px; overflow: auto; }
  .live__sql span { flex: 0 0 auto; font-weight: 700; color: var(--sg-muted, #888); }
  .live__sql code { white-space: nowrap; color: var(--sg-fg, inherit); background: var(--sg-header-bg, #f6f6f6); padding: 4px 8px; border-radius: 6px; }
</style>

View this example on GitHub

Related documentation

• Code generation
• Databases
• Getting started
• SvGrid Studio

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More Studio examples

• Northwind on PGlite - The classic Northwind sample DB (categories, customers, products, orders, order_details) seeded into a real in-browser Postgres (PGlite, WASM). Switch between a five-table JOIN exposed as a read-only VIEW and the editable base tables - each via createSqlDataSource. Sort / filter / page / edit all run as parameterized SQL; new rows get an auto id from a Postgres IDENTITY sequence.
• SvGrid Studio · Supabase - The Studio stack over hosted Postgres on Supabase, straight from the browser via supabase-js (PostgREST) and your project's public anon key. createSupabaseDataSource maps the grid's sort / filter / page / CRUD onto the query builder, introspectSupabaseTable adapts to any table AND detects foreign keys (a FK column auto-becomes a searchable lookup in the form), and createSupabaseRealtime makes it LIVE - change a row in the Supabase dashboard and it flashes in the grid (toggle the Live pill). Paste your URL + anon key, run the one-time setup SQL, done. RLS keeps the anon key safe.
• SvGrid Studio · relations - Foreign-key lookup fields end to end. Contacts belong to a Company: the contact form renders a searchable Company picker (SvLookupInput + createRelationLookup) that queries the Companies source and stores the id, while the grid shows the resolved company NAME. The lookup runs over the same ServerDataSource contract, so related options can come from Supabase / REST / SQL / in-memory (here both entities are in-memory).
• SvGrid Studio · secured - A secured screen: SvAuthGate requires a signed-in user (Supabase Auth via createSupabaseAuth) before showing the Studio grid, with a login / sign-up form and a signed-in bar. Uses a mock auth client so any email + password works here; swap for your supabase-js client and Row-Level Security scopes each user to their own rows (auth = who, RLS = what).
• SvGrid Studio · chart - A live chart panel beside the grid, driven by the same data source: rowsToChartSpec aggregates the rows (group by tier / active, reduce MRR by sum / avg / count) and SvGridChart renders bar / pie / line - no external chart library. The chart doubles as a filter control: click a bar or slice to filter the grid to that category. Create / edit / delete and the chart updates.