module ActiveRecord::ConnectionAdapters::MySQL::DatabaseStatements

Public Instance Methods

exec_delete(sql, name = nil, binds = []) click to toggle source
# File lib/active_record/connection_adapters/mysql/database_statements.rb, line 75
def exec_delete(sql, name = nil, binds = [])
  if without_prepared_statement?(binds)
    @lock.synchronize do
      execute_and_free(sql, name) { @connection.affected_rows }
    end
  else
    exec_stmt_and_free(sql, name, binds) { |stmt| stmt.affected_rows }
  end
end
Also aliased as: exec_update
exec_query(sql, name = "SQL", binds = [], prepare: false) click to toggle source
# File lib/active_record/connection_adapters/mysql/database_statements.rb, line 55
def exec_query(sql, name = "SQL", binds = [], prepare: false)
  if without_prepared_statement?(binds)
    execute_and_free(sql, name) do |result|
      if result
        build_result(columns: result.fields, rows: result.to_a)
      else
        build_result(columns: [], rows: [])
      end
    end
  else
    exec_stmt_and_free(sql, name, binds, cache_stmt: prepare) do |_, result|
      if result
        build_result(columns: result.fields, rows: result.to_a)
      else
        build_result(columns: [], rows: [])
      end
    end
  end
end
exec_update(sql, name = nil, binds = [])
Alias for: exec_delete
execute(sql, name = nil) click to toggle source

Executes the SQL statement in the context of this connection.

Calls superclass method
# File lib/active_record/connection_adapters/mysql/database_statements.rb, line 43
def execute(sql, name = nil)
  if preventing_writes? && write_query?(sql)
    raise ActiveRecord::ReadOnlyError, "Write query attempted while in readonly mode: #{sql}"
  end

  # make sure we carry over any changes to ActiveRecord::Base.default_timezone that have been
  # made since we established the connection
  @connection.query_options[:database_timezone] = ActiveRecord::Base.default_timezone

  super
end
explain(arel, binds = []) click to toggle source
# File lib/active_record/connection_adapters/mysql/database_statements.rb, line 33
def explain(arel, binds = [])
  sql     = "EXPLAIN #{to_sql(arel, binds)}"
  start   = Concurrent.monotonic_time
  result  = exec_query(sql, "EXPLAIN", binds)
  elapsed = Concurrent.monotonic_time - start

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

Private Instance Methods

combine_multi_statements(total_sql) click to toggle source
# File lib/active_record/connection_adapters/mysql/database_statements.rb, line 126
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) click to toggle source
Calls superclass method
# File lib/active_record/connection_adapters/mysql/database_statements.rb, line 94
def default_insert_value(column)
  super unless column.auto_increment?
end
exec_stmt_and_free(sql, name, binds, cache_stmt: false) { |stmt, result| ... } click to toggle source
# File lib/active_record/connection_adapters/mysql/database_statements.rb, line 153
def exec_stmt_and_free(sql, name, binds, cache_stmt: false)
  if preventing_writes? && write_query?(sql)
    raise ActiveRecord::ReadOnlyError, "Write query attempted while in readonly mode: #{sql}"
  end

  materialize_transactions
  mark_transaction_written_if_write(sql)

  # make sure we carry over any changes to ActiveRecord::Base.default_timezone that have been
  # made since we established the connection
  @connection.query_options[:database_timezone] = ActiveRecord::Base.default_timezone

  type_casted_binds = type_casted_binds(binds)

  log(sql, name, binds, type_casted_binds) do
    if cache_stmt
      stmt = @statements[sql] ||= @connection.prepare(sql)
    else
      stmt = @connection.prepare(sql)
    end

    begin
      result = ActiveSupport::Dependencies.interlock.permit_concurrent_loads do
        stmt.execute(*type_casted_binds)
      end
    rescue Mysql2::Error => e
      if cache_stmt
        @statements.delete(sql)
      else
        stmt.close
      end
      raise e
    end

    ret = yield stmt, result
    result.free if result
    stmt.close unless cache_stmt
    ret
  end
end
execute_batch(statements, name = nil) click to toggle source
# File lib/active_record/connection_adapters/mysql/database_statements.rb, line 87
def execute_batch(statements, name = nil)
  combine_multi_statements(statements).each do |statement|
    execute(statement, name)
  end
  @connection.abandon_results!
end
last_inserted_id(result) click to toggle source
# File lib/active_record/connection_adapters/mysql/database_statements.rb, line 98
def last_inserted_id(result)
  @connection.last_id
end
max_allowed_packet() click to toggle source
# File lib/active_record/connection_adapters/mysql/database_statements.rb, line 149
def max_allowed_packet
  @max_allowed_packet ||= show_variable("max_allowed_packet")
end
max_allowed_packet_reached?(current_packet, previous_packet) click to toggle source
# File lib/active_record/connection_adapters/mysql/database_statements.rb, line 138
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
multi_statements_enabled?() click to toggle source
# File lib/active_record/connection_adapters/mysql/database_statements.rb, line 102
def multi_statements_enabled?
  flags = @config[:flags]

  if flags.is_a?(Array)
    flags.include?("MULTI_STATEMENTS")
  else
    flags.anybits?(Mysql2::Client::MULTI_STATEMENTS)
  end
end
with_multi_statements() { || ... } click to toggle source
# File lib/active_record/connection_adapters/mysql/database_statements.rb, line 112
def with_multi_statements
  multi_statements_was = multi_statements_enabled?

  unless multi_statements_was
    @connection.set_server_option(Mysql2::Client::OPTION_MULTI_STATEMENTS_ON)
  end

  yield
ensure
  unless multi_statements_was
    @connection.set_server_option(Mysql2::Client::OPTION_MULTI_STATEMENTS_OFF)
  end
end