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handle1 method

DataMount

An opaque capability for SQL queries against a named remote mount; the handle reveals nothing of where the data lives. An app receives one only in datumhue.args.data_mounts: granted at launch, or by its parent's data_mounts spawn option.

Obtained from
datumhue.args
Accepted by
datumhue.app.spawn

The examples on this page start from:

lua
local sales = datumhue.args.data_mounts.sales

Methods 1

DataMount:query

method
DataMount:query(sql: string, params?: table) -> DataHandle

Build a DataHandle that runs sql against the mount when it is first read; nothing is sent before then. Errors raise where the handle is read; wrap that read in pcall to catch them. params is an integer-indexed table of bound values substituted into ? placeholders in order, or omitted for no parameters. Each value must be nil, boolean, integer, number, or string.

Example
local sql = "SELECT region, total FROM orders WHERE year = ?"
local orders = sales:query(sql, { 2026 })
-- The query runs here, when the handle is first consumed.
print(orders:count())

In the guide: Query and chart data

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This Font Software is licensed under the SIL Open Font License, Version 1.1.
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