module PgHero::Methods::Explain
Public Instance Methods
explain(sql)
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# File lib/pghero/methods/explain.rb, line 4 def explain(sql) sql = squish(sql) explanation = nil # use transaction for safety with_transaction(statement_timeout: (explain_timeout_sec * 1000).round, rollback: true) do if (sql.sub(/;\z/, "").include?(";") || sql.upcase.include?("COMMIT")) && !explain_safe? raise ActiveRecord::StatementInvalid, "Unsafe statement" end explanation = select_all("EXPLAIN #{sql}").map { |v| v[:"QUERY PLAN"] }.join("\n") end explanation end
Private Instance Methods
explain_safe?()
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# File lib/pghero/methods/explain.rb, line 21 def explain_safe? select_all("SELECT 1; SELECT 1") false rescue ActiveRecord::StatementInvalid true end