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Module: ActiveRecord::ConnectionAdapters::MySQL::DatabaseStatements

Constant Summary

Instance Attribute Summary

Instance Method Summary

Instance Attribute Details

#analyze_without_explain? ⇒ Boolean (readonly, private)

mariadb.com/kb/en/analyze-statement/

[ GitHub ] 

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb', line 50



def analyze_without_explain?
  mariadb? && database_version >= "10.1.0"
end


  







Instance Method Details



  

    #build_explain_clause(options = [])  
  

  [ GitHub ]


  

  


# 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


  








  

    #combine_multi_statements(total_sql)   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb', line 58



def combine_multi_statements(total_sql)
  total_sql.each_with_object([]) do |sql, total_sql_chunks|
    previous_packet = total_sql_chunks.last
    if max_allowed_packet_reached?(sql, previous_packet)
      total_sql_chunks << +sql
    else
      previous_packet << ";\n"
      previous_packet << sql
    end
  end
end


  








  

    #default_insert_value(column)   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb', line 54



def default_insert_value(column)
  super unless column.auto_increment?
end


  








  

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

  [ GitHub ]


  

  


# 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  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb', line 23



def high_precision_current_timestamp
  HIGH_PRECISION_CURRENT_TIMESTAMP
end


  








  

    #max_allowed_packet   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb', line 81



def max_allowed_packet
  @max_allowed_packet ||= show_variable("max_allowed_packet")
end


  








  

    #max_allowed_packet_reached?(current_packet, previous_packet)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb', line 70



def max_allowed_packet_reached?(current_packet, previous_packet)
  if current_packet.bytesize > max_allowed_packet
    raise ActiveRecordError,
      "Fixtures set is too large #{current_packet.bytesize}. Consider increasing the max_allowed_packet variable."
  elsif previous_packet.nil?
    true
  else
    (current_packet.bytesize + previous_packet.bytesize + 2) > max_allowed_packet
  end
end


  








  

    #write_query?(sql)  ⇒ Boolean 
  

  

    This method is for internal use only.
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb', line 17



def write_query?(sql) # :nodoc:
  !READ_QUERY.match?(sql)
rescue ArgumentError # Invalid encoding
  !READ_QUERY.match?(sql.b)
end