在节点js的sqllite数据库中批量插入class object

Question

I have the following class called Label:

class Label{
    constructor(imageid, plotid, camera, date, x, y, w, h, id, hash){
      this.imageid = imageid;
      this.plotid = plotid;
      this.camera = camera;
      this.date = date;
      this.x = x;
      this.y = y;
      this.w = w;
      this.h = h;
      this.id = id;
      this.hash = hash
    }
  }

I have a list of these class objects called labels that I want to insert, or rather bulk insert into my sqllite database, which looks like the following:

I tried to insert this array of class objects with:

function addRowsToDb(){
    console.log("Adding rows to the db")
    db = new sqlite3.Database('./annotator.db');
    db.serialize(function() {

        var stmt = db.prepare("INSERT INTO Label(ImageID, PlotID, Camera, Date, x, y, w, h, LabelHash) VALUES (?,?,?,?,?,?,?,?,?)");
        labels.forEach((label) => {
            stmt.run(label.imageid, label.plotid, label.camera, label.date, label.x, label.y, label.w, label.h, label.hash);
        })
        stmt.finalize();
    });
    db.close();
}

Which gave me the following errors in the console:

Uncaught Error: SQLITE_CONSTRAINT: NOT NULL constraint failed: Label.ImageID

Uncaught Error: SQLITE_CONSTRAINT: NOT NULL constraint failed: Label.LabelHash

Could someone explain to me how to do this properly and how to do this with bulk data, so not the forEach with the labels array?

Answer 1

I think the error is pretty straight forward - you try to insert NULL values into non-nullable db columns ( Label.ImageID and Label.LabelHash ).

How to solve this depends on what makes the most sense for your app:

• remove the NOT NULL constraint on those columns
• skip the labels that don't have ImageID and LabelHash set
• provide a default value (empty string for example) for the ImageID and LabelHash cols