MWe’re setting a clear goal: we want to make D1 “generally available” (GA) for production use-cases by early next year (Q1 2024).
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undefined has never been supported.KNot supported. Queries with undefined values will return a D1_TYPE_ERROR
Kundefined to bindMK
bind and seeing which one is undefined, and going from there - the part of the D1 binding that throws that error hasn't changed functionally in a very long time.
JMwrangler.toml in production: https://developers.cloudflare.com/pages/platform/functions/bindings/#d1-databases
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SELECT on an indexed unique column. 
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IIIundefinedundefinedbindbind[env.staging]
d1_databases = [
{ binding = "DB", database_name = "test1", database_id = "1111", preview_database_id = "DB" },
]
wrangler pages deploy ./public --project-name myproj --env staging # works
[env.production]
d1_databases = [
{ binding = "DB", database_name = "test1-prod", database_id = "1111" },
]
wrangler pages deploy ./public --project-name myproj --env production --branch main # throw "Cannot read properties of undefined (reading 'prepare')"wrangler.tomlSELECTlet d1ReadResults = await env.DB.prepare("SELECT * FROM Entries WHERE hash = ?1")
.bind(hash)
.first();