使用Entity Framework 6检查Oracle数据库中是否存在记录的最快方法

Question

I need to figure out if a key exists in an Oracle database using Entity Framework. My front end uses this call a lot, I was wondering which approach would be fastest? Should I get the first matching record and check if is null, check the count of the key and see if it's greater than one, or use Any? Or is there a solution I haven't thought of that is quicker than these?

Answer 1

I'd recommend Any , as you don't need to count. It should be translated to an EXISTS statement, which is faster than a COUNT(*).

Maybe something like:

var exists = ctx.MyEntities.Where(x => x.Id == ...).Any();

Don't instantiate your entity (eg, using Find ) because that would hurt the performance, as you only want to check if a record exists.