Refactor data readers

[Tigrov]

Fix BatchQueryResult according to main PR

• yiisoft/db#822

Q	A
Is bugfix?	✔️/❌
New feature?	❌
Breaks BC?	❌
Fixed issues	-

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.22%. Comparing base (889c21f) to head (b7cc679). Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #300      +/-   ##
============================================
+ Coverage     98.10%   98.22%   +0.12%     
+ Complexity      218      212       -6     
============================================
  Files            17       16       -1     
  Lines           632      620      -12     
============================================
- Hits            620      609      -11     
+ Misses           12       11       -1     

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