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Rails: Use a connection pool for the database connection #177

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Rails: Use a connection pool for the database connection #177

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9 changes: 5 additions & 4 deletions frameworks/rails/app/controllers/benchmark_controller.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -88,8 +88,9 @@ def db

min_val = (params[:min] || 10).to_f
max_val = (params[:max] || 50).to_f
conn = get_db
rows = conn.execute(DB_QUERY, [min_val, max_val])
rows = connection_pool.with do |conn|
conn.execute(DB_QUERY, [min_val, max_val])
end
items = rows.map do |r|
{
'id' => r['id'], 'name' => r['name'], 'category' => r['category'],
Expand All @@ -114,8 +115,8 @@ def not_found

private

def get_db
Thread.current[:rails_db] ||= begin
def connection_pool
$connection_pool ||= ConnectionPool.new(size: 4, timeout: 5) do
db = SQLite3::Database.new('/data/benchmark.db', readonly: true)
db.execute('PRAGMA mmap_size=268435456')
db.results_as_hash = true
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