Check if data is included in SQLite3 database with node.js

Question

So i want to check if some kind of text data is in my database with node.js

if(db.run("message.author.username IN (participations|name)")) {
    db.run("INSERT INTO participations(name, info) VALUES (?, ?)", [message.author.username, message.content]);
    message.author.send("Teilnahme bestätigt!");
} else {
    message.author.send("Du nimmst schon teil!");
};

The if().. part isnt working, everything else without if() is working too. Is there a way to use that properly?

Answer 1

Database calls are generally promises... meaning you need to provide a callback function, then check the results there:

db.run("message.author.username IN (participations|name)", (err, rows) => {
    if(rows.length > 0) {
      console.log("we have data!");
      db.run("INSERT INTO participations(name, info) VALUES (?, ?)", [message.author.username, message.content]);
    } else {
      console.log("no data!");
    }
});

Also, it appears your "select" isn't actaully valid SQL, unless there's some magic of the SQLite3 framework that I'm unaware of. Generally, the SQL to determine if rows exist would be in the format of:

SELECT * FROM <table.name> WHERE username IN (<your values>)