Fix test Reviewed-on: https://gitea.com/xorm/xorm/pulls/1526
fix test fixed Join strings on func Exist Co-authored-by: Tomofumi Kusana <tkusana@morisawa.co.jp> Reviewed-on: https://gitea.com/xorm/xorm/pulls/1520
* add SetSchema for engine * fix user * fix postgres with schema * fix test * fix test * fix test * fix tablename * refactor tableName * fix schema support * improve the interface of EngineInterface