Module: ArJdbc::MySQL::ExplainSupport

Included in:
ActiveRecord::ConnectionAdapters::MysqlAdapter
Defined in:
lib/arjdbc/mysql/explain_support.rb

Defined Under Namespace

Classes: ExplainPrettyPrinter

Instance Method Summary collapse

Instance Method Details

#explain(arel, binds = []) ⇒ Object 



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# File 'lib/arjdbc/mysql/explain_support.rb', line 8

def explain(arel, binds = [])
  sql = "EXPLAIN #{to_sql(arel, binds)}"
  start = Time.now.to_f
  raw_result = execute(sql, "EXPLAIN", binds)
  elapsed = Time.now.to_f - start
  # TODO we should refactor to exce_query once it returns Result ASAP :
  keys = raw_result[0] ? raw_result[0].keys : {}
  rows = raw_result.map { |hash| hash.values }
  ExplainPrettyPrinter.new.pp ActiveRecord::Result.new(keys, rows), elapsed
end

#supports_explain? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arjdbc/mysql/explain_support.rb', line 4

def supports_explain?
  true
end