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Add pipeline support #253

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Commits on Jul 2, 2022

  1. Separate reading results from writing queries

    @jgaskins
    jgaskins committed Jul 2, 2022
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  2. Add support for query pipelining 

    To use from a connection:

    result_sets = pg.pipeline do |pipe|
      pipe.query "SELECT 42"
      pipe.query "SELECT * FROM posts LIMIT $1", limit
    end
    result_sets.scalar(Int32) # => 42
    result_sets.read_all(Post) # => [Post(@id=1, ...), ...]

WARNING: This commit does not ensure that all result sets are fully
consumed.
    @jgaskins
    jgaskins committed Jul 2, 2022
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