What is a possible value for a Uint8Array typed variable in TypeScript?

Question

What are possible values if a variable inside an interface is typed as Uint8Array?

typeorm/src/driver/sqljs/SqljsConnectionOptions.ts https://github.com/typeorm/typeorm/blob/master/src/driver/sqljs/SqljsConnectionOptions.ts

/**
 * Sql.js-specific connection options.
 */
export interface SqljsConnectionOptions extends BaseConnectionOptions {

    /**
     * A Uint8Array that gets imported when the connection is opened.
     */
    readonly database?: Uint8Array;
}

If already read MDN's article on Uint8Array, but it did not help.

EDIT: As you can see, there is a database name required. Intuitivly I would past in the name of my database, but this is a string. So how does a database in Uint8Array format look like?

What do you mean, it did not help? A variable declared as Uint8Array can have a value of Uint8Array, obviously. E.g. new Uint8Array(10) is a value it could have. What specifically is the problem you are having? — Amadan
– Amadan, Commented Feb 23, 2018 at 19:55

Amadan · Accepted Answer · 2018-02-27 06:12:07Z

2

It is not a database name. It is a database. Reading up on what sql.js is will show you it is SQLite compiled into JavaScript through Emscripten, with an in-memory store. By default, it gives you a blank database, which will get forgotten when you stop using it; but you have an option of importing it from, or exporting it to, an Uint8Array, which is literally the byte-by-byte contents of your SQLite database file. Look at sql.js readme to see many examples of how to get the database array (from upload, from XHR, from Node.js reading of a file...).

answered Feb 27, 2018 at 6:12

Amadan

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4 Comments

Michael W. Czechowski Over a year ago

This wasn't really clear for me. After reading more, I've understood the principles of Unit8Array, but please, this is not cristal clear and unintuitive.

Amadan Over a year ago

What specifically wasn't clear? Do you have a SQLite database you wish to import? If you do, where is it? Are we talking clientside or serverside? The answer is as clear as the question lets it be; besides, the examples on the linked README address most scenarios.

Michael W. Czechowski Over a year ago

I think you have missunderstood me, I am totally fine with your answer. I meant the reading for instance on MDN etc. You'r answer finally clearified everthing ;)

Amadan Over a year ago

Ah I see. :) Cheers then!

LuizAsFight · Accepted Answer · 2022-06-20 19:04:19Z

1

Type of data is gonna be an array of 8-bit unsigned integer.

If you're not familiar with it, this link explains well http://ctp.mkprog.com/en/ctp/unsigned_8bit_integer/

"8-bit unsigned integer type is used to store only pozitiv whole number. 8-bit unsigned integer and his value range: from 0 to 255."

answered Jun 20, 2022 at 19:04

LuizAsFight

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