Implement https://github.com/crystal-lang/crystal-db/pull/9 #1
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| {% for t in DB::TYPES %} | ||
| def read?(t : {{t}}.class) : {{t}}? | ||
| read_if_not_nil do |row_packet, col| | ||
| @columns[col].column_type.read(row_packet).as({{t}}) |
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if each column_type implements a Column(T) mixin that stats def read : T maybe we could leave
@columns[col].column_type.as(Column(T)).read(row_packet)
in order to avoid the implicit unions due to return types.
Yet some overloads for the nillable types will be needed.
@asterite WDYT?
the current PR is not worse that what we currently have due to the implicit unions. So we should be fine.
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