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实例公共方法

build_explain_clause(options = [])

来源: 显示 | 在 GitHub 上

# File activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb, line 36
def build_explain_clause(options = [])
  return "EXPLAIN" if options.empty?

  explain_clause = "EXPLAIN #{options.join(" ").upcase}"

  if analyze_without_explain? && explain_clause.include?("ANALYZE")
    explain_clause.sub("EXPLAIN ", "")
  else
    explain_clause
  end
end

explain(arel, binds = [], options = [])

来源: 显示 | 在 GitHub 上

# File activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb, line 27
def explain(arel, binds = [], options = [])
  sql     = build_explain_clause(options) + " " + to_sql(arel, binds)
  start   = Process.clock_gettime(Process::CLOCK_MONOTONIC)
  result  = internal_exec_query(sql, "EXPLAIN", binds)
  elapsed = Process.clock_gettime(Process::CLOCK_MONOTONIC) - start

  MySQL::ExplainPrettyPrinter.new.pp(result, elapsed)
end

high_precision_current_timestamp()

来源: 显示 | 在 GitHub 上

# File activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb, line 23
def high_precision_current_timestamp
  HIGH_PRECISION_CURRENT_TIMESTAMP
end