WIP: db2 support

[lunny]

No description provided.

[codecov-io]

Codecov Report

Merging #1387 into master will decrease coverage by 1.9%.
The diff coverage is 2.13%.

@@            Coverage Diff             @@
##           master    #1387      +/-   ##
==========================================
- Coverage   57.46%   55.55%   -1.91%     
==========================================
  Files          44       45       +1     
  Lines        7915     8187     +272     
==========================================
  Hits         4548     4548              
- Misses       2804     3075     +271     
- Partials      563      564       +1

Impacted Files	Coverage Δ
dialect_db2.go	0% <0%> (ø)
xorm.go	67.16% <60%> (-1.02%)	⬇️

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