Fatal error using try!

[Silve2611]

As already mentioned in #339 the try! will cause a program to crash if multiple programs access the database at the same time.
This is not only happening when using Scalar but also when using

SELECT * FROM table

let table = Table("TProperties")
var all = [Row]()
do{
    all = Array(try db.prepare(table))
}catch{
     print("getSettings failed")
}

The reason behind it is the Generator type

extension Statement : GeneratorType {
    public func next() -> [Binding?]? {
        return try! step() ? Array(row) : nil
    }
}

My solution for it is the following change but i couldn't test yet if it is really working

extension Statement : GeneratorType {
    public func next() -> [Binding?]? {
        var result:[Binding?]?
        do{
            result = try step() ? Array(row) : nil
        }catch{
            result = nil
        }
        return result
        //return try! step() ? Array(row) : nil
    }
}

[blkbam]

I'm seeing the same thing occur. I'm crashing while iterating through the results. @Silve2611 did this change work for you?

[nickmshelley]

I'm hoping #413 will get merged at some point, which I think should take care of this. Unfortunately it's dependent on #451, but once that's through I'll try to get the error handling one to a good place.

[blkbam]

Just the change above alone to next() seems to do it in my short time testing however I'm sure the other changes are beneficial. I'll go through some more testing and take a look at the other PR's to see if I need to branch or hold off.

[Silve2611]

Yes you are right. I had to modify the next() method to solve this. I helped myself by rewriting the statement function

extension Statement : GeneratorType {
     public func next() -> [Binding?]? {
        var result:[Binding?]?
        do{
            result = try step() ? Array(row) : nil
        }catch{
            result = nil
        }
        return result
        //this was the old code
        //return try! step() ? Array(row) : nil 
    }
}