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SQLite3 Node.js JSON


SQLite3 Node.js JSON

By : Brett James Settle
Date : November 22 2020, 07:01 PM
I wish this helpful for you The sqlite3 package supports the Sqlite JSON1 extension by default. Riffing slightly on the example provided by the sqlite3 package:
code :
const sqlite3 = require('sqlite3').verbose();
const db = new sqlite3.Database(':memory:');

db.serialize(function() {
    db.run('CREATE TABLE lorem (info TEXT)');
    let stmt = db.prepare('INSERT INTO lorem VALUES(json(?))');
    for (let i=0; i<10; i++) {
        stmt.run(JSON.stringify({ a: i }));
    }
    stmt.finalize();

    db.each('SELECT rowid AS id, json_extract(info, \'$.a\') AS info FROM lorem', function(err, row) {
        console.log(row.id + ": " + row.info);
    });
});


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How to format node.js sqlite3 record set as a JSON object of record arrays

How to format node.js sqlite3 record set as a JSON object of record arrays


By : Hangl
Date : March 29 2020, 07:55 AM
To fix this issue
Based on what I know of JSON I was expecting the whole recordset to be enclosed with curly brackets, and each record to be enclosed with a square bracket. However I'm seeing the opposite.
I am sending a sqlite3 query result through node js to the browser as json

I am sending a sqlite3 query result through node js to the browser as json


By : user796467
Date : March 29 2020, 07:55 AM
wish of those help Likely cause
You're trying to open Items.db in the same directory as server.js. There is no file named Items.db in the directory, so a new empty database Items.db is created.
code :
var db = new sqlite3.Database('Items.db');
var db = new sqlite3.Database('relative_path_to/Items.db');
sqlite3 Items.db
sqlite> CREATE TABLE IF NOT EXISTS Items (id INTEGER);
sqlite> .exit
Return array of ids from sqlite3 database using node-sqlite3

Return array of ids from sqlite3 database using node-sqlite3


By : Mariann Magyar
Date : March 29 2020, 07:55 AM
To fix the issue you can do I was able to achieve the desired result by wrapping the call to db.each with a Promise:
code :
const selectIds = () => {
  return new Promise((resolve, reject) => {
    let result = []
    db.each(`select id from users;`, (err, row) => {
      if(err) { reject(err) }
      result.push(row.id)
    }, () => {
      resolve(result)
    })
  })
}

selectIds().then((ids) => console.log(ids)
How to install node-sqlite3, but skip the build step and provide my own build of sqlite3?

How to install node-sqlite3, but skip the build step and provide my own build of sqlite3?


By : user2457404
Date : March 29 2020, 07:55 AM
With these it helps It turns out that I was looking for a package like this one:
dblite on npm, GitHub
Node-sqlite3 seems slow compared to Python's sqlite3 module

Node-sqlite3 seems slow compared to Python's sqlite3 module


By : Rohan Sharma
Date : March 29 2020, 07:55 AM
this one helps. Well, the python library and the node.js library do not work at all in the same way.
Python will run everything in the same thread, in a sequential way. At most one query is processed at the same time, and the memory footprint is limited to the results of one query.
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