48 lines
1.4 KiB
Ruby
48 lines
1.4 KiB
Ruby
# This is an example of using Mysql::ResultSet#use_result [see docs for what that does]
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# this function is useful for those who have large query results and want to be able to parse them
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# as they come in, instead of having to wait for the query to finish before doing parsing
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# for me, running this on a query with 200_000 lines decreases total time to create an array of results
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# from .82s to .62s
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# you can experiment with it by changing the query here to be a long one, and toggling the do_the_use_query_optimization variable
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# this also has the interesting property of 'freeing' Ruby to do thread changes mid-query.
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require 'create_test_db'
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do_the_use_query_optimization = true
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$count = 5
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$start = Time.now
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$connections = []
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$count.times do
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$connections << Mysql.real_connect('localhost','root', '', 'local_test_db')
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end
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puts 'connection pool ready'
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$threads = []
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$count.times do |i|
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$threads << Thread.new do
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puts "sending query on connection #{i}"
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conn = $connections[i]
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saved = []
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query = "select * from test_table"
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if do_the_use_query_optimization
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conn.query_with_result=false
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result = conn.async_query(query)
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res = result.use_result
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res.each_hash { |h| saved << h }
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res.free
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else
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conn.async_query(query).each_hash {|h| saved << h }
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end
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end
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end
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puts 'waiting on threads'
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$threads.each{|t| t.join }
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puts Time.now - $start
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