can add Named Argument for orm

[dfy167]

1. What version of Go and system type/arch are you using?

go 1.12, linux/amd64

2. What version of GoFrame are you using?

2.0.6

3. Can this issue be re-produced with the latest release?

no

5. What did you expect to see?

supports named arguments such as : db.Where("name1 = @name OR name2 = @name", map[string]interface{}{"name": "namedpara"})