You can use Entry.objects.filter(name=”name”, title=”title”).exists() This will return to you true/false values. When you use count the orm generates query which will be executed much longer than in exists method. The get method will raise an exception when object does not exists. request.POST is a dictionary so to check db with it you use, i.e.: … Read more
Query is rewritten and compiled by the database server If you don’t use a prepared statement, the database server will have to parse, and compute an execution plan for the statement each time you run it. If you find that you’ll run the same statement multiple times (with different parameters) then its worth preparing the … Read more
There is a box in SQL Commander labeled Max Rows. Set it to -1 for the complete result set.
Member .findOne({ country_id: 10 }) .sort(‘-score’) // give me the max .exec(function (err, member) { // your callback code }); Check the mongoose docs for querying, they are pretty good. If you dont’t want to write the same code again you could also add a static method to your Member model like this: memberSchema.statics.findMax = … Read more
In the general sense, I think that overnormalized is when you are doing so many JOINs to retrieve data that it is causing notable performance penalties and deadlocks on your database, even after you’ve tuned the heck out of your indexes. Obviously, for huge applications and sites like MySpace or eBay, de-normalization is a scaling … Read more
I ended up finding a quick line that’d do it for me: foreach (var deleteMe in deleteThese) { // Delete validation if(CanDeleteItem(deleteMe.ItemId)) { /// deleteMe.Prices.ToList().ForEach(p => db.ItemPrices.Remove(p)); /// db.Entry(deleteMe).State = EntityState.Deleted; } } db.SaveChanges();
No, you’re just making extra work for yourself. As long as you’re doing enough testing that changing an ID here or there won’t give the users access to something they shouldn’t then you’re fine having the IDs visible. In some situations it can be beneficial to hide them or have non-sequential numbers, or maybe not … Read more
Separate table, normalized Not as XML or json , but separate numbers in separate rows No matter what you think, it’s the best way. You can thank me later
You should create column before creating a foreign key: $table->integer(‘category_id’)->unsigned(); $table->foreign(‘category_id’)->references(‘id’)->on(‘categories’); Documentation: http://laravel.com/docs/5.1/migrations#foreign-key-constraints