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NodeJS - Modularising SQLite3


NodeJS - Modularising SQLite3

By : jason zhou
Date : November 22 2020, 10:33 AM
I wish this helpful for you I like to split out my code where possible - and having SQL in a route makes me cringe. , Sorted it by adding an actual call back to the function... sigh...
code :
module.exports.get_names = function(db, callback) {

  var sql = " SELECT attr_name " +
            "      , attr_value " +  
            "   FROM contacts  a " +
            "      , contact_attributes b " +
            "  WHERE a.contact_id = b.contact_id " +
            "    AND (attr_name = 'forename' OR attr_name = 'surname')";


  return db.all(sql, function(err, rowset) {
    if (err) throw err;

    return callback(rowset);

  });

}


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NodeJS + AppJS + Sqlite3

NodeJS + AppJS + Sqlite3


By : Nipunika Niyomali
Date : March 29 2020, 07:55 AM
help you fix your problem Found a great solution. Persist works perfectly with AppJS, and has a great non-blocking sqlite3 driver. Just in case anyone else was wondering
sqlite3 nodejs get value from table

sqlite3 nodejs get value from table


By : user5939935
Date : March 29 2020, 07:55 AM
may help you . Returning data from an async function might return undefined as the database request might not have completed on execution of return statement.
code :
function getName(uid, callback){
  var query = "SELECT name FROM table WHERE uid = " + uid;
  var name = null;
  db.all(query, function (err, rows) {
    if(err){
        console.log(err);
    }else{
      name = rows[0].name;
    }
  });
  return name; <--- this can be execute before db.all() if executed therefore returning null. This is because javascript runs asynchronously.
}
function getName(uid, callback){
  var query = "SELECT name FROM table WHERE uid = " + uid;
  db.all(query, function (err, rows) {
    if(err){
        console.log(err);
    }else{
        callback(rows[0].name);
    }
  });
}
function print(name) {
  console.log(name);
}
var uid = req.session.user;
getName(uid, print);
Why I'm getting no results from sqlite3 (under nodeJs)?

Why I'm getting no results from sqlite3 (under nodeJs)?


By : J Doe
Date : March 29 2020, 07:55 AM
I hope this helps you . You actually haven't added users in your database.
In order to execute a prepared query statement, you need to use the .run method.
code :
var stmt = db.prepare("INSERT INTO usersTable VALUES (null, ?, ?)");          
stmt.run( userName, passw, onAddNewUsernameFinished );
stmt.finalize();
Modularising projects with Maven

Modularising projects with Maven


By : Teja Saragadam
Date : March 29 2020, 07:55 AM
I hope this helps . The best aproach is to create a multi module build which looks like this:
Modularising CSS questions

Modularising CSS questions


By : geoff
Date : March 29 2020, 07:55 AM
this one helps. 1) According to BEM methodology you can use mixes to solve your first issue:
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